Date   

Now: Wednesday Evening 40 and 80 meter Nets - 07/28/2021 #cal-notice

main@4SQRP.groups.io Calendar <noreply@...>
 

Wednesday Evening 40 and 80 meter Nets

When:
07/28/2021
20:00 to 21:00
(UTC-05:00) America/Chicago

Where:
40 and 80 Meters

Organizer: jomatlock@...

View Event

Description:
The 40 Meter Net will be at 8:00 pm central time (DST)  on 7.122 +-. QRM
NCS is WQ5RP/ACØBQ 

Wednesday evening 80 Meter CW Net. will be at  (8:30PM Central Time Wednesday (DST). 



The 80 meter net will be called on 3.564 MHz +/- QRM.
Net control operator is Johnny ACØBQ 

* NEW *  Wednesday evening DMR Voice Net will be at (Thursday) 02:00 UTC (9:00PM Central dst Time Wednesday/)
Four States QRP has a Brandmeister DMR Talk Group (TG31654). Join us to discuss QRP, ask questions, or just ragchew. The Wednesday net is a directed net  but any other time you may use the Talk Group to chat with other QRPers.
Net Control operator is Bert NØYJ.


Tonight's DMR Net topic

Robert
 

Tonight's DMR Net topic.

What changes do you think will take place in amateur radio over the next ten years?

Hope to hear you on the net, TG31654

After the 80mtr  cw net 

Bert
N0YJ


Event: Wednesday Evening 40 and 80 meter Nets - 07/28/2021 #cal-reminder

main@4SQRP.groups.io Calendar <noreply@...>
 

Reminder: Wednesday Evening 40 and 80 meter Nets

When:
07/28/2021
20:00 to 21:00
(UTC-05:00) America/Chicago

Where:
40 and 80 Meters

Organizer: jomatlock@...

View Event

Description:
The 40 Meter Net will be at 8:00 pm central time (DST)  on 7.122 +-. QRM
NCS is WQ5RP/ACØBQ 

Wednesday evening 80 Meter CW Net. will be at  (8:30PM Central Time Wednesday (DST). 



The 80 meter net will be called on 3.564 MHz +/- QRM.
Net control operator is Johnny ACØBQ 

* NEW *  Wednesday evening DMR Voice Net will be at (Thursday) 02:00 UTC (9:00PM Central dst Time Wednesday/)
Four States QRP has a Brandmeister DMR Talk Group (TG31654). Join us to discuss QRP, ask questions, or just ragchew. The Wednesday net is a directed net  but any other time you may use the Talk Group to chat with other QRPers.
Net Control operator is Bert NØYJ.


Re: A quest for a QRP sized Differential T matching unit

W6BOW
 

Dear Johnny and All,

I've been enjoying this FB discussion.

Attached find info on Antenna-Matching Devices from the 1986 ARRL publication, "QRP Notebook" By Doug DeMaw, W1F

73

W6BOW (Don)
San Francisco



-----Original Message-----
From: Johnny AC0BQ <jomatlock@...>
To: main@4sqrp.groups.io
Sent: Tue, Jul 27, 2021 6:55 pm
Subject: Re: [4SQRP] A quest for a QRP sized Differential T matching unit

Ge Jim
Another piece of art!
Good job on the gears.
72
Johnny ACØBQ 

On Tue, Jul 27, 2021 at 6:38 PM Jim Sheldon <w0eb@...> wrote:
Nice Jim.  Great job on the gears.
> On Jul 27, 2021, at 6:34 PM, Jim, N5IB <n5ib@...> wrote:
>
> With the weekend's experiments showing a continuously variable inductance is reasonably possible, it's now time to see how to make the differential capacitor.
> Photo attached of a first "proof of concept" effort.
> Geared together, the two air variables turn in opposite directions, so when one is at max, the other is at min, and vice-versa.
> The smaller gear that drives the pair has half the teeth, so a full turn of the "knob" results in 180 degrees at the caps.
>
> Quite a bit of mechanical details to work out - not my strongest suit -  but it looks like the thing can be done, and fit in a box certainly not larger than a Bayou Jumper.
>
> BTW - I did locate the article that shows a variable inductor made with a moving iron powder core:
> Discussed in Hayward's Solid State Design p166, referencing a Feb 1976 QST article by K1KLO
>
> Jim, N5IB
>
>
>
>
>
> <Capacitors and Gear Train.jpg>






--
Check out the 4SQRP website at 4sqrp.com


Re: A quest for a QRP sized Differential T matching unit

Johnny AC0BQ
 

Ge Jim
Another piece of art!
Good job on the gears.
72
Johnny ACØBQ 

On Tue, Jul 27, 2021 at 6:38 PM Jim Sheldon <w0eb@...> wrote:
Nice Jim.  Great job on the gears.
> On Jul 27, 2021, at 6:34 PM, Jim, N5IB <n5ib@...> wrote:
>
> With the weekend's experiments showing a continuously variable inductance is reasonably possible, it's now time to see how to make the differential capacitor.
> Photo attached of a first "proof of concept" effort.
> Geared together, the two air variables turn in opposite directions, so when one is at max, the other is at min, and vice-versa.
> The smaller gear that drives the pair has half the teeth, so a full turn of the "knob" results in 180 degrees at the caps.
>
> Quite a bit of mechanical details to work out - not my strongest suit -  but it looks like the thing can be done, and fit in a box certainly not larger than a Bayou Jumper.
>
> BTW - I did locate the article that shows a variable inductor made with a moving iron powder core:
> Discussed in Hayward's Solid State Design p166, referencing a Feb 1976 QST article by K1KLO
>
> Jim, N5IB
>
>
>
>
>
> <Capacitors and Gear Train.jpg>






--
Check out the 4SQRP website at 4sqrp.com


Event: Wednesday Evening 40 and 80 meter Nets - 07/28/2021 #cal-reminder

main@4SQRP.groups.io Calendar <noreply@...>
 

Reminder: Wednesday Evening 40 and 80 meter Nets

When:
07/28/2021
20:00 to 21:00
(UTC-05:00) America/Chicago

Where:
40 and 80 Meters

Organizer: jomatlock@...

View Event

Description:
The 40 Meter Net will be at 8:00 pm central time (DST)  on 7.122 +-. QRM
NCS is WQ5RP/ACØBQ 

Wednesday evening 80 Meter CW Net. will be at  (8:30PM Central Time Wednesday (DST). 



The 80 meter net will be called on 3.564 MHz +/- QRM.
Net control operator is Johnny ACØBQ 

* NEW *  Wednesday evening DMR Voice Net will be at (Thursday) 02:00 UTC (9:00PM Central dst Time Wednesday/)
Four States QRP has a Brandmeister DMR Talk Group (TG31654). Join us to discuss QRP, ask questions, or just ragchew. The Wednesday net is a directed net  but any other time you may use the Talk Group to chat with other QRPers.
Net Control operator is Bert NØYJ.


Re: A quest for a QRP sized Differential T matching unit

Jim Sheldon
 

Nice Jim. Great job on the gears.

On Jul 27, 2021, at 6:34 PM, Jim, N5IB <n5ib@juno.com> wrote:

With the weekend's experiments showing a continuously variable inductance is reasonably possible, it's now time to see how to make the differential capacitor.
Photo attached of a first "proof of concept" effort.
Geared together, the two air variables turn in opposite directions, so when one is at max, the other is at min, and vice-versa.
The smaller gear that drives the pair has half the teeth, so a full turn of the "knob" results in 180 degrees at the caps.

Quite a bit of mechanical details to work out - not my strongest suit - but it looks like the thing can be done, and fit in a box certainly not larger than a Bayou Jumper.

BTW - I did locate the article that shows a variable inductor made with a moving iron powder core:
Discussed in Hayward's Solid State Design p166, referencing a Feb 1976 QST article by K1KLO

Jim, N5IB





<Capacitors and Gear Train.jpg>


A quest for a QRP sized Differential T matching unit

Jim, N5IB
 

With the weekend's experiments showing a continuously variable inductance is reasonably possible, it's now time to see how to make the differential capacitor.
Photo attached of a first "proof of concept" effort.
Geared together, the two air variables turn in opposite directions, so when one is at max, the other is at min, and vice-versa.
The smaller gear that drives the pair has half the teeth, so a full turn of the "knob" results in 180 degrees at the caps.

Quite a bit of mechanical details to work out - not my strongest suit - but it looks like the thing can be done, and fit in a box certainly not larger than a Bayou Jumper.

BTW - I did locate the article that shows a variable inductor made with a moving iron powder core:
Discussed in Hayward's Solid State Design p166, referencing a Feb 1976 QST article by K1KLO

Jim, N5IB


Re: Bayou jumper crystal spotter boards.

david edmonds
 

Everett
I would like it 
Dave K4DME


On Jul 27, 2021, at 14:05, Everett Catlin <everettcatlin68@...> wrote:


I have one left so if anyone wants it e mail me.

73
Everett Catlin N5MZX


Bayou jumper crystal spotter boards.

Everett Catlin
 

I have one left so if anyone wants it e mail me.

73
Everett Catlin N5MZX


Event: Wednesday Evening 40 and 80 meter Nets - 07/28/2021 #cal-reminder

main@4SQRP.groups.io Calendar <noreply@...>
 

Reminder: Wednesday Evening 40 and 80 meter Nets

When:
07/28/2021
20:00 to 21:00
(UTC-05:00) America/Chicago

Where:
40 and 80 Meters

Organizer: jomatlock@...

View Event

Description:
The 40 Meter Net will be at 8:00 pm central time (DST)  on 7.122 +-. QRM
NCS is WQ5RP/ACØBQ 

Wednesday evening 80 Meter CW Net. will be at  (8:30PM Central Time Wednesday (DST). 



The 80 meter net will be called on 3.564 MHz +/- QRM.
Net control operator is Johnny ACØBQ 

* NEW *  Wednesday evening DMR Voice Net will be at (Thursday) 02:00 UTC (9:00PM Central dst Time Wednesday/)
Four States QRP has a Brandmeister DMR Talk Group (TG31654). Join us to discuss QRP, ask questions, or just ragchew. The Wednesday net is a directed net  but any other time you may use the Talk Group to chat with other QRPers.
Net Control operator is Bert NØYJ.


Re: 3D Print Roller Inductor... perhaps not.... but ...

Jim, N5IB
 

Results of some experiments with variable inductance:

Test coil - 24 turns AWG22, 1" diameter, 1.4" long (~17 turns per inch)
wound on a "natural" PLA 3D printed coil form (photo attached)
L = 7.4 uH, Q = 296

Inserted a 3/8" aluminum rod to completely fill the 1.4" length
L = 6.6 uH, Q = 221, Lmax/Lmin ratio = 1.12

Replaced the Al rod with an array of ten T37-2 iron powder toroid cores
L = 9.2 uH, Q = 318, Lmax/Lmin ratio = 1.24

Replaced the Al rod with a 3/8" ferrite rod (unknown mixture)
L = 31 uH, Q = 271, Lmax/Lmin ratio = 4.2

L and Q measurements were made by resonating the coil with a 33 pF polystyrene capacitor and measuring the resonant frequency and the 3 dB points.

Jim, N5IB


Re: Coil forms, Q, and instruments

WA4EFS
 

Thank you Jim N5IB and Jim Sheldon.. Inspired by your examples I returned to the struggle and finally figured out how to do a parameterized coil form in FreeCAD. Whew!

The point about the CPU demand of CAD applications is well-taken. FreeCAD also tends to become a bit sluggish as design complexity increases.

73, -Lloyd

-----Original Message-----
From: main@4SQRP.groups.io [mailto:main@4SQRP.groups.io] On Behalf Of Jim, N5IB
Sent: Friday, July 23, 2021 6:33 PM
To: main@4SQRP.groups.io
Subject: Re: [4SQRP] Coil forms, Q, and instruments

Hi Lloyd,

I'm CPU limited and can't run the better CAD packages like Fusion360.
So I've been using TinkerCad on-line, and it's been sufficient for most things I've needed.
With Ultimaker Cura 4.6.2 as the slicer

One day, with a better CPU, I'll move up.

Jim, N5IB


Re: Bayou Jumper kit back in stock!

PhilKE3FL
 

Ho, my bad I see the knob to the left is the straight key & the port is for any other key or keyer.
--
73 de KE3FL
Phil Karras
http://cs.yrex.com/ke3fl


Re: Bayou Jumper kit back in stock!

PhilKE3FL
 

Am I missing something? "Keying Options: Straight key built into the front panel, just like the original Paraset!"
When I look at the photo I see a small, 3mm?, headphone port for a straight key I assume. I do not see a built-in key as in photos of the original Paraset radio.
--
73 de KE3FL
Phil Karras
http://cs.yrex.com/ke3fl


Re: Bayou Jumper Price

David Walker
 

Have a great Sunday, and thanks again.

72

David AA9UC

On 7/25/2021 11:38 AM, Johnny AC0BQ wrote:
Ok, 
I see it now.
We will see if we can get that typo corrected.
I wish we could sell them for that!
That price might buy the circuit board!!
Thanks
72
Johnny ACØBQ 

On Sun, Jul 25, 2021 at 11:35 AM David Walker <aa9uc@...> wrote:


On 7/25/2021 11:29 AM, Johnny AC0BQ wrote:
Gm David
You may be looking at a old copy of the 
Souper upper page.

I just looked at the Bayou Jumper page and it shows $98.30.
It’s the same price as last time.
72
Johnny ACØBQ 

On Sun, Jul 25, 2021 at 11:25 AM David Walker <aa9uc@...> wrote:

The Bayou Jumper page indicates the cost of the kit is $30.00. As much as I wish it was true, I know it must be a typo.

Thanks for all the great kits. I own and have built several.

AA9UC


"Ordering Information:
The cost of this kit is $30 plus shipping. The drop down menu items below include shipping costs.
DX Buyers - DX shipping has become extremely volatile with extended delivery items and lost shipments. We have suspended all non-US orders as a result."


--
Check out the 4SQRP website at 4sqrp.com
--
Check out the 4SQRP website at 4sqrp.com


Re: Bayou Jumper Price

Johnny AC0BQ
 

Ok, 
I see it now.
We will see if we can get that typo corrected.
I wish we could sell them for that!
That price might buy the circuit board!!
Thanks
72
Johnny ACØBQ 

On Sun, Jul 25, 2021 at 11:35 AM David Walker <aa9uc@...> wrote:


On 7/25/2021 11:29 AM, Johnny AC0BQ wrote:
Gm David
You may be looking at a old copy of the 
Souper upper page.

I just looked at the Bayou Jumper page and it shows $98.30.
It’s the same price as last time.
72
Johnny ACØBQ 

On Sun, Jul 25, 2021 at 11:25 AM David Walker <aa9uc@...> wrote:

The Bayou Jumper page indicates the cost of the kit is $30.00. As much as I wish it was true, I know it must be a typo.

Thanks for all the great kits. I own and have built several.

AA9UC


"Ordering Information:
The cost of this kit is $30 plus shipping. The drop down menu items below include shipping costs.
DX Buyers - DX shipping has become extremely volatile with extended delivery items and lost shipments. We have suspended all non-US orders as a result."


--
Check out the 4SQRP website at 4sqrp.com

--
Check out the 4SQRP website at 4sqrp.com


Re: Bayou Jumper Price

David Walker
 


On 7/25/2021 11:29 AM, Johnny AC0BQ wrote:
Gm David
You may be looking at a old copy of the 
Souper upper page.

I just looked at the Bayou Jumper page and it shows $98.30.
It’s the same price as last time.
72
Johnny ACØBQ 

On Sun, Jul 25, 2021 at 11:25 AM David Walker <aa9uc@...> wrote:

The Bayou Jumper page indicates the cost of the kit is $30.00. As much as I wish it was true, I know it must be a typo.

Thanks for all the great kits. I own and have built several.

AA9UC


"Ordering Information:
The cost of this kit is $30 plus shipping. The drop down menu items below include shipping costs.
DX Buyers - DX shipping has become extremely volatile with extended delivery items and lost shipments. We have suspended all non-US orders as a result."


--
Check out the 4SQRP website at 4sqrp.com


Re: Bayou Jumper Price

Johnny AC0BQ
 

Gm David
You may be looking at a old copy of the 
Souper upper page.

I just looked at the Bayou Jumper page and it shows $98.30.
It’s the same price as last time.
72
Johnny ACØBQ 

On Sun, Jul 25, 2021 at 11:25 AM David Walker <aa9uc@...> wrote:

The Bayou Jumper page indicates the cost of the kit is $30.00. As much as I wish it was true, I know it must be a typo.

Thanks for all the great kits. I own and have built several.

AA9UC


"Ordering Information:
The cost of this kit is $30 plus shipping. The drop down menu items below include shipping costs.
DX Buyers - DX shipping has become extremely volatile with extended delivery items and lost shipments. We have suspended all non-US orders as a result."


--
Check out the 4SQRP website at 4sqrp.com


Bayou Jumper Price

David Walker
 

The Bayou Jumper page indicates the cost of the kit is $30.00. As much as I wish it was true, I know it must be a typo.

Thanks for all the great kits. I own and have built several.

AA9UC


"Ordering Information:
The cost of this kit is $30 plus shipping. The drop down menu items below include shipping costs.
DX Buyers - DX shipping has become extremely volatile with extended delivery items and lost shipments. We have suspended all non-US orders as a result."


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