Date   

Re: How do you test a toroid?

Johnny AC0BQ
 

Hey Guys:
This is sorta on topic, at least from the original thread.
The information is a Quote from Diz himself.
"Double check T3. Should be 2 turns primary centertaped and 2 turns secondary.
If yoo look at T3 from the right side of the board, you should see
only 3 loops of wire in the holes plust the 2 wires coming out."
This only describes one of the transformers, but it seems pretty clear?
My problem was related to low power out put and I thought I had messed up this coil!
Good luck
72
Johnny AC0BQ




On Wed, Mar 27, 2013 at 7:48 PM, Rick Bennett <kc0pet@...> wrote:
 

To further expand on this, the "MFJ-259B" version has a mode that reads inductance directly. It has an upper limit of 60 uH, but in this case it should work. You will need to make a connector with clip leads for the '259.

Also Diz has a handy calculator for toroids on his web site:

http://toroids.info/BN-61-2402.php

de KC0PET, Rick

----- Original Message -----
That reminds me. I've got an "Elsie" kit which measures either
inductance or capacitance and displays it via CW. It doesn't seem to
work, probably because I have yet to build the stupid thing!! Maybe I
should put that near the top of my list of kits to build. I can't
remember but it probably cost less than that Chinese meter. Its only
advantage is it provides some CW practice while measuring your components.

In answer to someone's question, the MFJ-259 can indeed measure
inductance. As I recall, you put a 50 ohm resistor in series with an LC
circuit, find where the SWR is 1.0, and then do a little math to
calculate the inductance, assuming you accurately know the value of the
capacitor. The appropriate equation is in the handbook (probably any
edition) and the instructions are in the MFJ manual. The L and C need to
produce resonance at a frequency covered by the MFJ-259. Don't try to
measure that 2 Henry choke in your junk box!

72,
John AA0VE

On 03/27/2013 06:37 PM, w1sfr wrote:
>
> I went ahead and ordered one. Free shipping from China for $25.
>
> 73
> Steve
>
> --- In 4sqrp@... 4sqrp%40yahoogroups.com>, Bill
> Cromwell wrote:
> >
> > On Wed, 2013-03-27 at 14:03 -0700, chuck adams wrote:
> > >
> > > On 03/27/2013 01:50 PM, Lee Mairs (SAG) wrote:
> > >
> > > >
> > > > Check eBay. The Chinese have an LC ESR meter that is about $25.
> > > > Has good reviews and works great.
> > > > 73 de Lee
> > > > KM4YY
> > > >
> > > >
> > > >
> > > A few days ago on qrp-tech, some one recommended the following.
> > > I ordered one and will run some tests on it, but the fact that it does
> > > so much is appealing, especially the ESR since I haven't gotten around
> > > to homebrewing one and the bench queue is too long now. :-)
> > >
> > > Maybe some one has already gotten the same model already.
> > >
> > > FYI
> > >
> > > chuck, k7qo
> > >
> > >
> <http://www.ebay.com/itm/330855732011?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649>
> >
> >
> > Hi,
> >
> > Requires PayPal and PayPal only. Other offers?
> >
> > 73,
> >
> > Bill KU8H
> >
>
>

------------------------------------

4SQRP Website: http://4sqrp.com
OzarkCon is coming April 5-6 in Branson, MO
View Details at http://www.ozarkcon.com/index.phpYahoo! Groups Links



Re: How do you test a toroid?

Johnny AC0BQ
 

Hey Guys:
This is sorta on topic, at least from the original thread.
The information is a Quote from Diz himself.
"Double check T3. Should be 2 turns primary centertaped and 2 turns secondary.
If yoo look at T3 from the right side of the board, you should see
only 3 loops of wire in the holes plust the 2 wires coming out."
This only describes one of the transformers, but it seems pretty clear?
My problem was related to low power out put and I thought I had messed up this coil!
Good luck
72
Johnny AC0BQ




On Wed, Mar 27, 2013 at 7:48 PM, Rick Bennett <kc0pet@...> wrote:
 

To further expand on this, the "MFJ-259B" version has a mode that reads inductance directly. It has an upper limit of 60 uH, but in this case it should work. You will need to make a connector with clip leads for the '259.

Also Diz has a handy calculator for toroids on his web site:

http://toroids.info/BN-61-2402.php

de KC0PET, Rick

----- Original Message -----
That reminds me. I've got an "Elsie" kit which measures either
inductance or capacitance and displays it via CW. It doesn't seem to
work, probably because I have yet to build the stupid thing!! Maybe I
should put that near the top of my list of kits to build. I can't
remember but it probably cost less than that Chinese meter. Its only
advantage is it provides some CW practice while measuring your components.

In answer to someone's question, the MFJ-259 can indeed measure
inductance. As I recall, you put a 50 ohm resistor in series with an LC
circuit, find where the SWR is 1.0, and then do a little math to
calculate the inductance, assuming you accurately know the value of the
capacitor. The appropriate equation is in the handbook (probably any
edition) and the instructions are in the MFJ manual. The L and C need to
produce resonance at a frequency covered by the MFJ-259. Don't try to
measure that 2 Henry choke in your junk box!

72,
John AA0VE

On 03/27/2013 06:37 PM, w1sfr wrote:
>
> I went ahead and ordered one. Free shipping from China for $25.
>
> 73
> Steve
>
> --- In 4sqrp@... 4sqrp%40yahoogroups.com>, Bill
> Cromwell wrote:
> >
> > On Wed, 2013-03-27 at 14:03 -0700, chuck adams wrote:
> > >
> > > On 03/27/2013 01:50 PM, Lee Mairs (SAG) wrote:
> > >
> > > >
> > > > Check eBay. The Chinese have an LC ESR meter that is about $25.
> > > > Has good reviews and works great.
> > > > 73 de Lee
> > > > KM4YY
> > > >
> > > >
> > > >
> > > A few days ago on qrp-tech, some one recommended the following.
> > > I ordered one and will run some tests on it, but the fact that it does
> > > so much is appealing, especially the ESR since I haven't gotten around
> > > to homebrewing one and the bench queue is too long now. :-)
> > >
> > > Maybe some one has already gotten the same model already.
> > >
> > > FYI
> > >
> > > chuck, k7qo
> > >
> > >
> <http://www.ebay.com/itm/330855732011?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649>
> >
> >
> > Hi,
> >
> > Requires PayPal and PayPal only. Other offers?
> >
> > 73,
> >
> > Bill KU8H
> >
>
>

------------------------------------

4SQRP Website: http://4sqrp.com
OzarkCon is coming April 5-6 in Branson, MO
View Details at http://www.ozarkcon.com/index.phpYahoo! Groups Links



Re: eznec and LTspice software

Eric Dallmann
 

EZNEC is available at: http://eznec.com/

The trial period for the demo is forever, but you can only use 20 segments (which severely limits what antennas you can model accurately).  However, it does let you see (and use) all the program's features.  A full version of EZNEC (there are several levels you can purchase) may not be the cheapest antenna modeling program out there, but often you get what you pay for.

Eric/K9VIC


From: Johnny Matlock
To: 4sqrp@...
Sent: Wednesday, March 27, 2013 7:37 PM
Subject: Re: [4sqrp] eznec and LTspice software

 
Ge Guys:
I have been following the thread, kinda.
I have to ask the question.
Where do you get the ENZEC?
I would suppose from the web site? How much is it after the trial period?
Thanks
Johnny AC0BQ

On Wed, Mar 27, 2013 at 7:30 PM, k9vic <ericdallmann@...> wrote:
 
Phil,

I agree on current manuals in general; they're mostly awful.  I just thought that the EZNEC manual was an odd choice to pick on when there are so many truly bad ones to choose from.  Your suggestion would probably improve the EZNEC manual, but it's plenty usable as-is.

I also agree on your assessment of Roy.  I'm sure I've tried his patience more than once via both e-mail and phone, but he's never showed it (running the pro version here too).

Eric/K9VIC


From: Phil Anderson <aldenmcduffie@...>
To: Eric Dallmann <K9VIC@...>; 4sqrp@...
Sent: Wednesday, March 27, 2013 10:09 AM
Subject: Re: [4sqrp] eznec and LTspice software

Hi Eric..............my point was that manuals in general could be improved. I've talked to Roy in person at a few hamfests; nice guy! Outstanding program; paid for the pro version; and like it a lot.
 
What I'd still like is an executive summary at the beginning of every manual and/or sectoin that outlines the big picture  ---- probably not going to get it. A narrative ahead of each "click here than then click there" would be nice.
 
Unk Phil.
 
 
---- Original Message -----
Sent: Tuesday, March 26, 2013 8:35 PM
Subject: Re: [4sqrp] eznec and LTspice software

Really, you find the EZNEC manual poorly written?  I actually think Roy did an outstanding job with it (I have no financial interest in EZNEC).  Of course, I will point out that antenna modeling is a little more involved than turning on/off some combination of four burners and an oven, so the manual may not read like that of a 1950's vintage range.  If that's what you were looking for in the EZNEC manual, I can see why you were disappointed.

Eric/K9VIC


From: Phil Anderson <aldenmcduffie@...>
To: 4sqrp@...; n0evh <n0evh@...>; WA0ITP <wa0itp@...>
Cc: Phil Anderson <aldenmcduffie@...>
Sent: Monday, March 25, 2013 11:42 AM
Subject: [4sqrp] eznec and LTspice software

 
Good idea John on downloading EZNEC. It does take a bit of time to get used to the manual/instructions - and that would be true of any manuals "written" today. Manuals in general are a problem. Take my iPhone as an example, really crappy documentation. About 6 or 8 years ago I was visiting my daughter in St Louis and we were cleaning her kitchen. We really cleaned the stove top gas range only to discover the manual for it in the drawer, written in about 1950. I found that manual to be excellent, very clear on how to use it and what burner went with what knob, etc. Not so of today's ranges. When did we stop teaching writing to kids, todays designers? Maybe about 1980?
 
A second via John, consider downloading LTspice. You can download a free copy from linear technology's website. It is really super for simulating circuit. It's easy, for example, to draw the schematic for a audio phase-shift oscillator and then hit the simulation button; you can select to see the waveform generated or the frequency response of the unit. Then you can change values and play what if. Again....the manual takes some time to get used to.
 
If anyone is interested, we could get a "go-to-meeting" link set up on the WEB and I'd be happy to outline how to use the program, generating and simulating several simple circuits. Let's discuss that at Ozcon?
 
Uncle Phil 
 
 








Re: How do you test a toroid?

Rick Bennett
 

To further expand on this, the "MFJ-259B" version has a mode that reads inductance directly. It has an upper limit of 60 uH, but in this case it should work. You will need to make a connector with clip leads for the '259.

Also Diz has a handy calculator for toroids on his web site:

http://toroids.info/BN-61-2402.php

de KC0PET, Rick

----- Original Message -----
That reminds me. I've got an "Elsie" kit which measures either
inductance or capacitance and displays it via CW. It doesn't seem to
work, probably because I have yet to build the stupid thing!! Maybe I
should put that near the top of my list of kits to build. I can't
remember but it probably cost less than that Chinese meter. Its only
advantage is it provides some CW practice while measuring your components.

In answer to someone's question, the MFJ-259 can indeed measure
inductance. As I recall, you put a 50 ohm resistor in series with an LC
circuit, find where the SWR is 1.0, and then do a little math to
calculate the inductance, assuming you accurately know the value of the
capacitor. The appropriate equation is in the handbook (probably any
edition) and the instructions are in the MFJ manual. The L and C need to
produce resonance at a frequency covered by the MFJ-259. Don't try to
measure that 2 Henry choke in your junk box!

72,
John AA0VE



On 03/27/2013 06:37 PM, w1sfr wrote:

I went ahead and ordered one. Free shipping from China for $25.

73
Steve

--- In 4sqrp@yahoogroups.com <mailto:4sqrp%40yahoogroups.com>, Bill
Cromwell <wrcromwell@...> wrote:

On Wed, 2013-03-27 at 14:03 -0700, chuck adams wrote:

On 03/27/2013 01:50 PM, Lee Mairs (SAG) wrote:


Check eBay. The Chinese have an LC ESR meter that is about $25.
Has good reviews and works great.
73 de Lee
KM4YY


A few days ago on qrp-tech, some one recommended the following.
I ordered one and will run some tests on it, but the fact that it does
so much is appealing, especially the ESR since I haven't gotten around
to homebrewing one and the bench queue is too long now. :-)

Maybe some one has already gotten the same model already.

FYI

chuck, k7qo

<http://www.ebay.com/itm/330855732011?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649>


Hi,

Requires PayPal and PayPal only. Other offers?

73,

Bill KU8H


------------------------------------

4SQRP Website: http://4sqrp.com
OzarkCon is coming April 5-6 in Branson, MO
View Details at http://www.ozarkcon.com/index.phpYahoo! Groups Links


Re: eznec and LTspice software

Johnny AC0BQ
 

Ge Guys:
I have been following the thread, kinda.
I have to ask the question.
Where do you get the ENZEC?
I would suppose from the web site? How much is it after the trial period?
Thanks
Johnny AC0BQ

On Wed, Mar 27, 2013 at 7:30 PM, k9vic <ericdallmann@...> wrote:
 

Phil,

I agree on current manuals in general; they're mostly awful.  I just thought that the EZNEC manual was an odd choice to pick on when there are so many truly bad ones to choose from.  Your suggestion would probably improve the EZNEC manual, but it's plenty usable as-is.

I also agree on your assessment of Roy.  I'm sure I've tried his patience more than once via both e-mail and phone, but he's never showed it (running the pro version here too).

Eric/K9VIC


From: Phil Anderson <aldenmcduffie@...>
To: Eric Dallmann <K9VIC@...>; 4sqrp@...
Sent: Wednesday, March 27, 2013 10:09 AM
Subject: Re: [4sqrp] eznec and LTspice software

Hi Eric..............my point was that manuals in general could be improved. I've talked to Roy in person at a few hamfests; nice guy! Outstanding program; paid for the pro version; and like it a lot.
 
What I'd still like is an executive summary at the beginning of every manual and/or sectoin that outlines the big picture  ---- probably not going to get it. A narrative ahead of each "click here than then click there" would be nice.
 
Unk Phil.
 
 
---- Original Message -----
Sent: Tuesday, March 26, 2013 8:35 PM
Subject: Re: [4sqrp] eznec and LTspice software

Really, you find the EZNEC manual poorly written?  I actually think Roy did an outstanding job with it (I have no financial interest in EZNEC).  Of course, I will point out that antenna modeling is a little more involved than turning on/off some combination of four burners and an oven, so the manual may not read like that of a 1950's vintage range.  If that's what you were looking for in the EZNEC manual, I can see why you were disappointed.

Eric/K9VIC


From: Phil Anderson <aldenmcduffie@...>
To: 4sqrp@...; n0evh <n0evh@...>; WA0ITP <wa0itp@...>
Cc: Phil Anderson <aldenmcduffie@...>
Sent: Monday, March 25, 2013 11:42 AM
Subject: [4sqrp] eznec and LTspice software

 
Good idea John on downloading EZNEC. It does take a bit of time to get used to the manual/instructions - and that would be true of any manuals "written" today. Manuals in general are a problem. Take my iPhone as an example, really crappy documentation. About 6 or 8 years ago I was visiting my daughter in St Louis and we were cleaning her kitchen. We really cleaned the stove top gas range only to discover the manual for it in the drawer, written in about 1950. I found that manual to be excellent, very clear on how to use it and what burner went with what knob, etc. Not so of today's ranges. When did we stop teaching writing to kids, todays designers? Maybe about 1980?
 
A second via John, consider downloading LTspice. You can download a free copy from linear technology's website. It is really super for simulating circuit. It's easy, for example, to draw the schematic for a audio phase-shift oscillator and then hit the simulation button; you can select to see the waveform generated or the frequency response of the unit. Then you can change values and play what if. Again....the manual takes some time to get used to.
 
If anyone is interested, we could get a "go-to-meeting" link set up on the WEB and I'd be happy to outline how to use the program, generating and simulating several simple circuits. Let's discuss that at Ozcon?
 
Uncle Phil 
 
 






Re: eznec and LTspice software

Eric Dallmann
 

Phil,

I agree on current manuals in general; they're mostly awful.  I just thought that the EZNEC manual was an odd choice to pick on when there are so many truly bad ones to choose from.  Your suggestion would probably improve the EZNEC manual, but it's plenty usable as-is.

I also agree on your assessment of Roy.  I'm sure I've tried his patience more than once via both e-mail and phone, but he's never showed it (running the pro version here too).

Eric/K9VIC


From: Phil Anderson
To: Eric Dallmann ; 4sqrp@...
Sent: Wednesday, March 27, 2013 10:09 AM
Subject: Re: [4sqrp] eznec and LTspice software


Hi Eric..............my point was that manuals in general could be improved. I've talked to Roy in person at a few hamfests; nice guy! Outstanding program; paid for the pro version; and like it a lot.
 
What I'd still like is an executive summary at the beginning of every manual and/or sectoin that outlines the big picture  ---- probably not going to get it. A narrative ahead of each "click here than then click there" would be nice.
 
Unk Phil.
 
 
---- Original Message -----
Sent: Tuesday, March 26, 2013 8:35 PM
Subject: Re: [4sqrp] eznec and LTspice software

Really, you find the EZNEC manual poorly written?  I actually think Roy did an outstanding job with it (I have no financial interest in EZNEC).  Of course, I will point out that antenna modeling is a little more involved than turning on/off some combination of four burners and an oven, so the manual may not read like that of a 1950's vintage range.  If that's what you were looking for in the EZNEC manual, I can see why you were disappointed.

Eric/K9VIC


From: Phil Anderson
To: 4sqrp@...; n0evh ; WA0ITP
Cc: Phil Anderson
Sent: Monday, March 25, 2013 11:42 AM
Subject: [4sqrp] eznec and LTspice software

 
Good idea John on downloading EZNEC. It does take a bit of time to get used to the manual/instructions - and that would be true of any manuals "written" today. Manuals in general are a problem. Take my iPhone as an example, really crappy documentation. About 6 or 8 years ago I was visiting my daughter in St Louis and we were cleaning her kitchen. We really cleaned the stove top gas range only to discover the manual for it in the drawer, written in about 1950. I found that manual to be excellent, very clear on how to use it and what burner went with what knob, etc. Not so of today's ranges. When did we stop teaching writing to kids, todays designers? Maybe about 1980?
 
A second via John, consider downloading LTspice. You can download a free copy from linear technology's website. It is really super for simulating circuit. It's easy, for example, to draw the schematic for a audio phase-shift oscillator and then hit the simulation button; you can select to see the waveform generated or the frequency response of the unit. Then you can change values and play what if. Again....the manual takes some time to get used to.
 
If anyone is interested, we could get a "go-to-meeting" link set up on the WEB and I'd be happy to outline how to use the program, generating and simulating several simple circuits. Let's discuss that at Ozcon?
 
Uncle Phil 
 
 





Re: How do you test a toroid?

Rick Bennett
 

A "2 Henry Choke". That sounds like some sort of self defense move...

----- Original Message -----
That reminds me. I've got an "Elsie" kit which measures either
inductance or capacitance and displays it via CW. It doesn't seem to
work, probably because I have yet to build the stupid thing!! Maybe I
should put that near the top of my list of kits to build. I can't
remember but it probably cost less than that Chinese meter. Its only
advantage is it provides some CW practice while measuring your components.

In answer to someone's question, the MFJ-259 can indeed measure
inductance. As I recall, you put a 50 ohm resistor in series with an LC
circuit, find where the SWR is 1.0, and then do a little math to
calculate the inductance, assuming you accurately know the value of the
capacitor. The appropriate equation is in the handbook (probably any
edition) and the instructions are in the MFJ manual. The L and C need to
produce resonance at a frequency covered by the MFJ-259. Don't try to
measure that 2 Henry choke in your junk box!

72,
John AA0VE



On 03/27/2013 06:37 PM, w1sfr wrote:

I went ahead and ordered one. Free shipping from China for $25.

73
Steve

--- In 4sqrp@yahoogroups.com <mailto:4sqrp%40yahoogroups.com>, Bill
Cromwell <wrcromwell@...> wrote:

On Wed, 2013-03-27 at 14:03 -0700, chuck adams wrote:

On 03/27/2013 01:50 PM, Lee Mairs (SAG) wrote:


Check eBay. The Chinese have an LC ESR meter that is about $25.
Has good reviews and works great.
73 de Lee
KM4YY


A few days ago on qrp-tech, some one recommended the following.
I ordered one and will run some tests on it, but the fact that it does
so much is appealing, especially the ESR since I haven't gotten around
to homebrewing one and the bench queue is too long now. :-)

Maybe some one has already gotten the same model already.

FYI

chuck, k7qo

<http://www.ebay.com/itm/330855732011?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649>


Hi,

Requires PayPal and PayPal only. Other offers?

73,

Bill KU8H


------------------------------------

4SQRP Website: http://4sqrp.com
OzarkCon is coming April 5-6 in Branson, MO
View Details at http://www.ozarkcon.com/index.phpYahoo! Groups Links


Re: How do you test a toroid?

John Lonigro
 

That reminds me. I've got an "Elsie" kit which measures either inductance or capacitance and displays it via CW. It doesn't seem to work, probably because I have yet to build the stupid thing!! Maybe I should put that near the top of my list of kits to build. I can't remember but it probably cost less than that Chinese meter. Its only advantage is it provides some CW practice while measuring your components.

In answer to someone's question, the MFJ-259 can indeed measure inductance. As I recall, you put a 50 ohm resistor in series with an LC circuit, find where the SWR is 1.0, and then do a little math to calculate the inductance, assuming you accurately know the value of the capacitor. The appropriate equation is in the handbook (probably any edition) and the instructions are in the MFJ manual. The L and C need to produce resonance at a frequency covered by the MFJ-259. Don't try to measure that 2 Henry choke in your junk box!

72,
John AA0VE

On 03/27/2013 06:37 PM, w1sfr wrote:

I went ahead and ordered one. Free shipping from China for $25.

73
Steve

--- In 4sqrp@yahoogroups.com <mailto:4sqrp%40yahoogroups.com>, Bill Cromwell <wrcromwell@...> wrote:

On Wed, 2013-03-27 at 14:03 -0700, chuck adams wrote:

On 03/27/2013 01:50 PM, Lee Mairs (SAG) wrote:


Check eBay. The Chinese have an LC ESR meter that is about $25.
Has good reviews and works great.
73 de Lee
KM4YY


A few days ago on qrp-tech, some one recommended the following.
I ordered one and will run some tests on it, but the fact that it does
so much is appealing, especially the ESR since I haven't gotten around
to homebrewing one and the bench queue is too long now. :-)

Maybe some one has already gotten the same model already.

FYI

chuck, k7qo

<http://www.ebay.com/itm/330855732011?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649>


Hi,

Requires PayPal and PayPal only. Other offers?

73,

Bill KU8H


Re: eznec and LTspice software

Rick Bennett
 

I second that.  The EZNEC manual is one of the best out there.  (My iPhone is one of the worst I have ever seen, I wouldn't even put them in the same category).  

I think the challenge with antenna modeling is that it is complex.  It takes time to learn how to get good results from the software.  I have found Roy's manual to be helpful for almost every odd situation I have messed with and that is above and beyond most manuals.  But antenna modeling takes time to learn and you just have to spend time, accept some trial and error with it and learn some antenna theory to understand what you are getting.

I have not tried LTspice yet, but I expect that the issues are similar.  

While these things may not quite be "rocket science", they are not far from it either.

de KC0PET, Rick


 

Really, you find the EZNEC manual poorly written?  I actually think Roy did an outstanding job with it (I have no financial interest in EZNEC).  Of course, I will point out that antenna modeling is a little more involved than turning on/off some combination of four burners and an oven, so the manual may not read like that of a 1950's vintage range.  If that's what you were looking for in the EZNEC manual, I can see why you were disappointed.

Eric/K9VIC


From: Phil Anderson
To: 4sqrp@...; n0evh ; WA0ITP
Cc: Phil Anderson
Sent: Monday, March 25, 2013 11:42 AM
Subject: [4sqrp] eznec and LTspice software

 
Good idea John on downloading EZNEC. It does take a bit of time to get used to the manual/instructions - and that would be true of any manuals "written" today. Manuals in general are a problem. Take my iPhone as an example, really crappy documentation. About 6 or 8 years ago I was visiting my daughter in St Louis and we were cleaning her kitchen. We really cleaned the stove top gas range only to discover the manual for it in the drawer, written in about 1950. I found that manual to be excellent, very clear on how to use it and what burner went with what knob, etc. Not so of today's ranges. When did we stop teaching writing to kids, todays designers? Maybe about 1980?
 
A second via John, consider downloading LTspice. You can download a free copy from linear technology's website. It is really super for simulating circuit. It's easy, for example, to draw the schematic for a audio phase-shift oscillator and then hit the simulation button; you can select to see the waveform generated or the frequency response of the unit. Then you can change values and play what if. Again....the manual takes some time to get used to.
 
If anyone is interested, we could get a "go-to-meeting" link set up on the WEB and I'd be happy to outline how to use the program, generating and simulating several simple circuits. Let's discuss that at Ozcon?
 
Uncle Phil 
 
 



Re: How do you test a toroid?

w1sfr <steverob@...>
 

I went ahead and ordered one. Free shipping from China for $25.

73
Steve

--- In 4sqrp@yahoogroups.com, Bill Cromwell <wrcromwell@...> wrote:

On Wed, 2013-03-27 at 14:03 -0700, chuck adams wrote:

On 03/27/2013 01:50 PM, Lee Mairs (SAG) wrote:


Check eBay. The Chinese have an LC ESR meter that is about $25.
Has good reviews and works great.
73 de Lee
KM4YY


A few days ago on qrp-tech, some one recommended the following.
I ordered one and will run some tests on it, but the fact that it does
so much is appealing, especially the ESR since I haven't gotten around
to homebrewing one and the bench queue is too long now. :-)

Maybe some one has already gotten the same model already.

FYI

chuck, k7qo

<http://www.ebay.com/itm/330855732011?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649>

Hi,

Requires PayPal and PayPal only. Other offers?

73,

Bill KU8H


Re: How do you test a toroid?

Bill Cromwell
 

On Wed, 2013-03-27 at 14:03 -0700, chuck adams wrote:

On 03/27/2013 01:50 PM, Lee Mairs (SAG) wrote:


Check eBay. The Chinese have an LC ESR meter that is about $25.
Has good reviews and works great.
73 de Lee
KM4YY


A few days ago on qrp-tech, some one recommended the following.
I ordered one and will run some tests on it, but the fact that it does
so much is appealing, especially the ESR since I haven't gotten around
to homebrewing one and the bench queue is too long now. :-)

Maybe some one has already gotten the same model already.

FYI

chuck, k7qo

<http://www.ebay.com/itm/330855732011?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649>

Hi,

Requires PayPal and PayPal only. Other offers?

73,

Bill KU8H


Re: How do you test a toroid -

John <n9rlojrh@...>
 

Can you test a toroid with an MFJ-259B analyzer? I don't know, I'm mostly just a big dumb fat guy, but it checks inductance and capacitance. John N9RLO

--- In 4sqrp@yahoogroups.com, "Todd F. Carney / K7TFC" <k7tfc@...> wrote:

I'll add my endorsement as well. The Chinese modules--tidy little pcbs with
LCD readout--are excellent. I have one for LC and one to test and
characterize transistors and other semiconductors. I'm very pleased with
each. The assumption that Chinese companies make junk is seriously
mistaken--in this case and in all my other Chinese experiences.

Todd / K7TFC
On Mar 27, 2013 1:32 PM, "W5COV" <cvest@...> wrote:

**


I have one of these on my quick test bench and it compares very favorably
to my high dollar test bench . It is quick and easy to use and accurate
enough for the home builder .

Charlie , W5COV

---- w1sfr <steverob@...> wrote:
I see a lot of LC meters on ebay. Do you think one of these might do the
trick or are they too cheap.

http://www.ebay.com/itm/L-C-F-5pF-1uF-0-05uH-500H-Inductance-Capacitance-High-Precision-LC-Meter-Clip-/170932517462?pt=LH_DefaultDomain_0&hash=item27cc5f3a56

73 Steve

--- In 4sqrp@yahoogroups.com, "Donald" <DKELLY42@> wrote:

I can't argue with the expense. I built my homebrew LC meter because
it was only a few bucks, simple and exceeded my required accuracy.

Good luck and have fun with your project, Steve.

72 K5UOS



--- In 4sqrp@yahoogroups.com, Stephen Roberts <steverob@> wrote:

Hi Don,

Well I can't see spending $150 for an LC meter although it would be
nice to have one. I'm not really a electronic tech by any means so it's
really hard to justify the expense. And from a practical point of view,
building one would take me forever but it certainly looks like a worthy
project. In the end, I'm sure I'll just fire it up and see what happens
which is my normal method of testing ;-)

73
Steve


On Mar 26, 2013, at 9:19 PM, Donald Kelly wrote:

Hi Steve,

I assume you know the ultimate inductance of the coil you are
winding. A handy tool to have is a L/C meter.
Not all toroids are alike and it is always a good idea to measure.
My guess is most of the guys have one of these.

http://aade.com/lcmeter.htm

This meter evolved from a homebrew project by Bill Carver, W7AAZ.
A digital readout was added later for easier use. The original project is
classic in its simplicity.
It is also included in "Experimental Methods in RF Design" in the
test gear chapter.

http://www.qsl.net/wm5z/cq199301b.pdf


My version is used all the time. You can see the ugly style board
is very simple. The trick is in the calibration steps and having a
precision calibrating capacitor.

http://forums.qrz.com/showthread.php?238952-A-Simple-Homebrew-L-and-C-Tester

Test gear is fun to build and a great way to get started in
scratch projects.

Don K5UOS



From: 4sqrp@yahoogroups.com [mailto:4sqrp@yahoogroups.com] On
Behalf Of w1sfr
Sent: Tuesday, March 26, 2013 11:18 AM
To: 4sqrp@yahoogroups.com
Subject: [4sqrp] How do you test a toroid?


The transforming toroids are pretty tricky to wind. Is there any
way to test them to find out if you've done it correctly?

73
Steve



Re: How do you test a toroid -

Todd K7TFC
 

I'll add my endorsement as well. The Chinese modules--tidy little pcbs with LCD readout--are excellent. I have one for LC and one to test and characterize transistors and other semiconductors. I'm very pleased with each. The assumption that Chinese companies make junk is seriously mistaken--in this case and in all my other Chinese experiences.

Todd / K7TFC

On Mar 27, 2013 1:32 PM, "W5COV" <cvest@...> wrote:
 

I have one of these on my quick test bench and it compares very favorably to my high dollar test bench . It is quick and easy to use and accurate enough for the home builder .

Charlie , W5COV

---- w1sfr <steverob@...> wrote:
> I see a lot of LC meters on ebay. Do you think one of these might do the trick or are they too cheap.
>
> http://www.ebay.com/itm/L-C-F-5pF-1uF-0-05uH-500H-Inductance-Capacitance-High-Precision-LC-Meter-Clip-/170932517462?pt=LH_DefaultDomain_0&hash=item27cc5f3a56
>
> 73 Steve
>
> --- In 4sqrp@..., "Donald" wrote:
> >
> > I can't argue with the expense. I built my homebrew LC meter because it was only a few bucks, simple and exceeded my required accuracy.
> >
> > Good luck and have fun with your project, Steve.
> >
> > 72 K5UOS
> >
> >
> >
> > --- In 4sqrp@..., Stephen Roberts wrote:
> > >
> > > Hi Don,
> > >
> > > Well I can't see spending $150 for an LC meter although it would be nice to have one. I'm not really a electronic tech by any means so it's really hard to justify the expense. And from a practical point of view, building one would take me forever but it certainly looks like a worthy project. In the end, I'm sure I'll just fire it up and see what happens which is my normal method of testing ;-)
> > >
> > > 73
> > > Steve
> > >
> > >
> > > On Mar 26, 2013, at 9:19 PM, Donald Kelly wrote:
> > >
> > > > Hi Steve,
> > > >
> > > > I assume you know the ultimate inductance of the coil you are winding. A handy tool to have is a L/C meter.
> > > > Not all toroids are alike and it is always a good idea to measure. My guess is most of the guys have one of these.
> > > >
> > > > http://aade.com/lcmeter.htm
> > > >
> > > > This meter evolved from a homebrew project by Bill Carver, W7AAZ. A digital readout was added later for easier use. The original project is classic in its simplicity.
> > > > It is also included in "Experimental Methods in RF Design" in the test gear chapter.
> > > >
> > > > http://www.qsl.net/wm5z/cq199301b.pdf
> > > >
> > > >
> > > > My version is used all the time. You can see the ugly style board is very simple. The trick is in the calibration steps and having a precision calibrating capacitor.
> > > >
> > > > http://forums.qrz.com/showthread.php?238952-A-Simple-Homebrew-L-and-C-Tester
> > > >
> > > > Test gear is fun to build and a great way to get started in scratch projects.
> > > >
> > > > Don K5UOS
> > > >
> > > >
> > > >
> > > > From: 4sqrp@... [mailto:4sqrp@...] On Behalf Of w1sfr
> > > > Sent: Tuesday, March 26, 2013 11:18 AM
> > > > To: 4sqrp@...
> > > > Subject: [4sqrp] How do you test a toroid?
> > > >
> > > >
> > > > The transforming toroids are pretty tricky to wind. Is there any way to test them to find out if you've done it correctly?
> > > >
> > > > 73
> > > > Steve
> > > >
> > > >
> > >
> >
>


Re: How do you test a toroid?

chuck adams <chuck.adams.k7qo@...>
 

On 03/27/2013 01:50 PM, Lee Mairs (SAG) wrote:
�

Check eBay.� The Chinese have an LC ESR meter that is about $25.� Has good reviews and works great.
73 de Lee
KM4YY

A few days ago on qrp-tech, some one recommended the following.
I ordered one and will run some tests on it, but the fact that it does
so much is appealing, especially the ESR since I haven't gotten around
to homebrewing one and the bench queue is too long now.� :-)

Maybe some one has already gotten the same model already.

FYI

chuck, k7qo





Re: How do you test a toroid?

Lee Mairs (SAG) <lmairs@...>
 

Check eBay.� The Chinese have an LC ESR meter that is about $25.� Has good reviews and works great.
73 de Lee
KM4YY

On 3/27/2013 10:31 AM, Stephen Roberts wrote:
�

Hi Don,


Well I can't see spending $150 for an LC meter although it would be nice to have one. I'm not really a electronic tech by any means so it's really hard to justify the expense. And from a practical point of view, building one would take me forever but it certainly looks like a worthy project. In the end, I'm sure I'll just fire it up and see what happens which is my normal method of testing ;-)

73
Steve


On Mar 26, 2013, at 9:19 PM, Donald Kelly wrote:

Hi Steve,
�
I assume you know the ultimate inductance of the coil you are winding. A handy tool to have is a L/C meter.
Not all toroids are alike and it is always a good idea to measure. My guess is most of the guys have one of these.
�
�
This �meter evolved from a homebrew project by Bill Carver, W7AAZ. A digital readout was added later for easier use. The original project is classic in its simplicity.
It is also included in �Experimental Methods in RF Design� in the test gear chapter.
�
�
�
My version is used all the time. You can see the ugly style board is very simple. The trick is in the calibration steps and having a precision calibrating capacitor.
�
�
Test gear is fun to build and a great way to get started in scratch projects.
�
Don K5UOS
�
�
�
From:�4sqrp@...�[mailto:4sqrp@...]�On Behalf Of�w1sfr
Sent:�Tuesday, March 26, 2013 11:18 AM
To:�4sqrp@...
Subject:�[4sqrp] How do you test a toroid?
�
�

The transforming toroids are pretty tricky to wind. Is there any way to test them to find out if you've done it correctly?

73
Steve




Re: How do you test a toroid -

Charlie Vest
 

I have one of these on my quick test bench and it compares very favorably to my high dollar test bench . It is quick and easy to use and accurate enough for the home builder .

Charlie , W5COV


---- w1sfr <steverob@shoreham.net> wrote:

I see a lot of LC meters on ebay. Do you think one of these might do the trick or are they too cheap.

http://www.ebay.com/itm/L-C-F-5pF-1uF-0-05uH-500H-Inductance-Capacitance-High-Precision-LC-Meter-Clip-/170932517462?pt=LH_DefaultDomain_0&hash=item27cc5f3a56

73 Steve

--- In 4sqrp@yahoogroups.com, "Donald" <DKELLY42@...> wrote:

I can't argue with the expense. I built my homebrew LC meter because it was only a few bucks, simple and exceeded my required accuracy.

Good luck and have fun with your project, Steve.

72 K5UOS



--- In 4sqrp@yahoogroups.com, Stephen Roberts <steverob@> wrote:

Hi Don,

Well I can't see spending $150 for an LC meter although it would be nice to have one. I'm not really a electronic tech by any means so it's really hard to justify the expense. And from a practical point of view, building one would take me forever but it certainly looks like a worthy project. In the end, I'm sure I'll just fire it up and see what happens which is my normal method of testing ;-)

73
Steve


On Mar 26, 2013, at 9:19 PM, Donald Kelly wrote:

Hi Steve,

I assume you know the ultimate inductance of the coil you are winding. A handy tool to have is a L/C meter.
Not all toroids are alike and it is always a good idea to measure. My guess is most of the guys have one of these.

http://aade.com/lcmeter.htm

This meter evolved from a homebrew project by Bill Carver, W7AAZ. A digital readout was added later for easier use. The original project is classic in its simplicity.
It is also included in "Experimental Methods in RF Design" in the test gear chapter.

http://www.qsl.net/wm5z/cq199301b.pdf


My version is used all the time. You can see the ugly style board is very simple. The trick is in the calibration steps and having a precision calibrating capacitor.

http://forums.qrz.com/showthread.php?238952-A-Simple-Homebrew-L-and-C-Tester

Test gear is fun to build and a great way to get started in scratch projects.

Don K5UOS



From: 4sqrp@yahoogroups.com [mailto:4sqrp@yahoogroups.com] On Behalf Of w1sfr
Sent: Tuesday, March 26, 2013 11:18 AM
To: 4sqrp@yahoogroups.com
Subject: [4sqrp] How do you test a toroid?


The transforming toroids are pretty tricky to wind. Is there any way to test them to find out if you've done it correctly?

73
Steve


Wed Nite Nets

WA0ITP
 

The Four State QRP Comfortable nets meet each Wednesday night
beginning at 7:30 PM CDT, 0030z.

If we have to QSY, I like to move up, Wayne likes to move down,
and Dick doesn't have to move much at all.

Add anything to the exchange that you wish, temp rig, ant, etc.
Checking into both, or even all, sessions is encouraged.
Who will be the first to check into all of them?

7:30 CDT 0030z ... 40M CW Net on 7122, KC�PMH NCS
8:00 CDT 0100z ... 80M CW Net on 3564, WA�ITP NCS.
8:30 CDT 0130z ... 40M CW Net on 7122, KC�PMH NCS
9:00 CDT 0200z ... 80M PSK Net on 3580.5, N�TGR NCS

All are welcome! After the nets, a list of checkins will be
posted on the Four State reflector.



----------------------------------
I love this radio stuff !
72 WA�ITP
www.wa0itp.com
www.4sqrp.com
www.qrpspots.com


Re: How do you test a toroid -

w1sfr <steverob@...>
 

I see a lot of LC meters on ebay. Do you think one of these might do the trick or are they too cheap.

http://www.ebay.com/itm/L-C-F-5pF-1uF-0-05uH-500H-Inductance-Capacitance-High-Precision-LC-Meter-Clip-/170932517462?pt=LH_DefaultDomain_0&hash=item27cc5f3a56

73 Steve

--- In 4sqrp@yahoogroups.com, "Donald" <DKELLY42@...> wrote:

I can't argue with the expense. I built my homebrew LC meter because it was only a few bucks, simple and exceeded my required accuracy.

Good luck and have fun with your project, Steve.

72 K5UOS



--- In 4sqrp@yahoogroups.com, Stephen Roberts <steverob@> wrote:

Hi Don,

Well I can't see spending $150 for an LC meter although it would be nice to have one. I'm not really a electronic tech by any means so it's really hard to justify the expense. And from a practical point of view, building one would take me forever but it certainly looks like a worthy project. In the end, I'm sure I'll just fire it up and see what happens which is my normal method of testing ;-)

73
Steve


On Mar 26, 2013, at 9:19 PM, Donald Kelly wrote:

Hi Steve,

I assume you know the ultimate inductance of the coil you are winding. A handy tool to have is a L/C meter.
Not all toroids are alike and it is always a good idea to measure. My guess is most of the guys have one of these.

http://aade.com/lcmeter.htm

This meter evolved from a homebrew project by Bill Carver, W7AAZ. A digital readout was added later for easier use. The original project is classic in its simplicity.
It is also included in "Experimental Methods in RF Design" in the test gear chapter.

http://www.qsl.net/wm5z/cq199301b.pdf


My version is used all the time. You can see the ugly style board is very simple. The trick is in the calibration steps and having a precision calibrating capacitor.

http://forums.qrz.com/showthread.php?238952-A-Simple-Homebrew-L-and-C-Tester

Test gear is fun to build and a great way to get started in scratch projects.

Don K5UOS



From: 4sqrp@yahoogroups.com [mailto:4sqrp@yahoogroups.com] On Behalf Of w1sfr
Sent: Tuesday, March 26, 2013 11:18 AM
To: 4sqrp@yahoogroups.com
Subject: [4sqrp] How do you test a toroid?


The transforming toroids are pretty tricky to wind. Is there any way to test them to find out if you've done it correctly?

73
Steve


Re: How do you test a toroid -

Donald Kelly
 

I can't argue with the expense. I built my homebrew LC meter because it was only a few bucks, simple and exceeded my required accuracy.

Good luck and have fun with your project, Steve.

72 K5UOS

--- In 4sqrp@yahoogroups.com, Stephen Roberts <steverob@...> wrote:

Hi Don,

Well I can't see spending $150 for an LC meter although it would be nice to have one. I'm not really a electronic tech by any means so it's really hard to justify the expense. And from a practical point of view, building one would take me forever but it certainly looks like a worthy project. In the end, I'm sure I'll just fire it up and see what happens which is my normal method of testing ;-)

73
Steve


On Mar 26, 2013, at 9:19 PM, Donald Kelly wrote:

Hi Steve,

I assume you know the ultimate inductance of the coil you are winding. A handy tool to have is a L/C meter.
Not all toroids are alike and it is always a good idea to measure. My guess is most of the guys have one of these.

http://aade.com/lcmeter.htm

This meter evolved from a homebrew project by Bill Carver, W7AAZ. A digital readout was added later for easier use. The original project is classic in its simplicity.
It is also included in "Experimental Methods in RF Design" in the test gear chapter.

http://www.qsl.net/wm5z/cq199301b.pdf


My version is used all the time. You can see the ugly style board is very simple. The trick is in the calibration steps and having a precision calibrating capacitor.

http://forums.qrz.com/showthread.php?238952-A-Simple-Homebrew-L-and-C-Tester

Test gear is fun to build and a great way to get started in scratch projects.

Don K5UOS



From: 4sqrp@yahoogroups.com [mailto:4sqrp@yahoogroups.com] On Behalf Of w1sfr
Sent: Tuesday, March 26, 2013 11:18 AM
To: 4sqrp@yahoogroups.com
Subject: [4sqrp] How do you test a toroid?


The transforming toroids are pretty tricky to wind. Is there any way to test them to find out if you've done it correctly?

73
Steve


Re: eznec and LTspice software

Phil Anderson
 


Hi Eric..............my point was that manuals in general could be improved. I've talked to Roy in person at a few hamfests; nice guy! Outstanding program; paid for the pro version; and like it a lot.
 
What I'd still like is an executive summary at the beginning of every manual and/or sectoin that outlines the big picture  ---- probably not going to get it. A narrative ahead of each "click here than then click there" would be nice.
 
Unk Phil.
 
 

---- Original Message -----
Sent: Tuesday, March 26, 2013 8:35 PM
Subject: Re: [4sqrp] eznec and LTspice software

Really, you find the EZNEC manual poorly written?  I actually think Roy did an outstanding job with it (I have no financial interest in EZNEC).  Of course, I will point out that antenna modeling is a little more involved than turning on/off some combination of four burners and an oven, so the manual may not read like that of a 1950's vintage range.  If that's what you were looking for in the EZNEC manual, I can see why you were disappointed.

Eric/K9VIC


From: Phil Anderson
To: 4sqrp@...; n0evh ; WA0ITP
Cc: Phil Anderson
Sent: Monday, March 25, 2013 11:42 AM
Subject: [4sqrp] eznec and LTspice software

 
Good idea John on downloading EZNEC. It does take a bit of time to get used to the manual/instructions - and that would be true of any manuals "written" today. Manuals in general are a problem. Take my iPhone as an example, really crappy documentation. About 6 or 8 years ago I was visiting my daughter in St Louis and we were cleaning her kitchen. We really cleaned the stove top gas range only to discover the manual for it in the drawer, written in about 1950. I found that manual to be excellent, very clear on how to use it and what burner went with what knob, etc. Not so of today's ranges. When did we stop teaching writing to kids, todays designers? Maybe about 1980?
 
A second via John, consider downloading LTspice. You can download a free copy from linear technology's website. It is really super for simulating circuit. It's easy, for example, to draw the schematic for a audio phase-shift oscillator and then hit the simulation button; you can select to see the waveform generated or the frequency response of the unit. Then you can change values and play what if. Again....the manual takes some time to get used to.
 
If anyone is interested, we could get a "go-to-meeting" link set up on the WEB and I'd be happy to outline how to use the program, generating and simulating several simple circuits. Let's discuss that at Ozcon?
 
Uncle Phil