Date   

Long Test Message for you to play with

Jim Sheldon
 

Calling all Bayou Jumper Agents,

Here's a long test message created with Mike, N2HTT's program. Still
using the mary had a little lamb poem for the keys so even manual
decoding will work right if you get things in the proper order. Please
let me know how you fared - instructions on how to reply are contained
in the message. If you can't get it to decode, please let me know off
the reflector to w0eb@cox.net

Jim - W0EB

Message follows:

OTRSD OTRSD 84

TZYLF EPNOR ASNAC OTUOG NTRTI
EELRA OHOTH TEEVZ TINOD TIADA
ATESL OTUYS SPLTN ESBUD EPANS
YRRNR GNPYE OTWEE BOLAD ETTSR
GBIOT CHGAR CMROS BNCMC NHTDA
AAIOR TESPS EREOE ESEAS SHIAN
OPETT CNHEO ELSNY PLROE SSTOA
ZERWX NEWSN IRNNE ESAYE EAEOP
COALD ZIUSP VAAEU PAPTA TOASG
VOLON KOHEI LTGEE OAOHL RATMI
TTYBA NCTRE AOMMD RNPMV STBOA
RONPE LKJVO ZETTS OEOER DXTTT
TLGAB OLRNV TONTE WHPTI DAOAG
RTVNE OEAIE RTFFN IVPLE TOIOS
NASFR OHLRD LCUEP EIOIE NSUTE
IDOOZ AWOWE NCENH DEGDP TAOTO
ARUAO OTSEL ILDLN DOISN


Re: Failed IRF510 in BJ

Jim M. <hotrods.2@...>
 

I had a problem with Q6 right after I powered my radio up. Got it fixed then a couple of days ago Q4 started smoking and

I'm pretty sure it burned up my whole radio. some of the etchings are fried, and nothing works now.


 

Burned my fingers on the reverse polarity IRF510. Rig was drawing 2.4 amps! Replaced it with junk box spare and all ok. Must be a QC issue with supplier.
Mike. n0mpm

Sent from my iPhone



Re: Failed IRF510 in BJ

n0mpm
 

Burned my fingers on the reverse polarity IRF510. Rig was drawing 2.4 amps! Replaced it with junk box spare and all ok. Must be a QC issue with supplier.
Mike. n0mpm

Sent from my iPhone


Re: Pixie success

Sam Neal
 

Hello Curt,

I just got two new QRP(p) rigs. One is a Pixie with the crystal that comes
with it. Later I will switch it out for a 7122 crystal. The other rig is a
Frog Sounds transceiver. I hope it sounds better than a bullfrog! hi.

I am in Cleveland plus about 12 miles East near Romayor and am very active on
QRP/QRPp. We are probably 60 miles apart as the crow flies.

I would like to work you, Pixie to Pixie to get an idea how my rig may sound
on the other end. I haven't hooked either of them up yet but will and also
check the output power on one of my two factory built/calibrated Oak Hills
Research WM-2 QRPp Watt-meters.

I am retired and largely confined to home - so I can meet you on the air
almost any time that is convenient with you.

If this is OK, let me know when would be a good time for you. I still need to
make up a couple of power cords and find a key with a 1/8 inch plug on it.
Also need to confirm output power. I have a J-38 with one but need to uncover
it first.

73,

Sam Neal N5AF
_________________________________________________________

Subject: [4sqrp] Re: Pixie success

Just worked KC3RN/QRP on 7.050 with Sea Sprite (Pixie) @ 1/2 W, about 1100
miles. I answered his CQ. 7.118 has been unfruitful as has been calling CQ
with 1/2W. H&P works better for me.

72, Curt KB5JO


Re: Pixie success

Curt
 

Just worked KC3RN/QRP on 7.050 with Sea Sprite (Pixie) @ 1/2 W, about 1100 miles.   I answered his CQ.  7.118 has been unfruitful as has been calling CQ with 1/2W.  H&P works better for me.

72, Curt KB5JO


Re: Ocon Oscillator Hunt [1 Attachment]

John Lonigro
 

Looks like a good use for an old ping pong paddle!

John - AA0VE


On 02/09/2017 05:33 PM, 'Jim Sheldon' w0eb@... [4sqrp] wrote:
 

Thanks for this one Jim.  I really didn't like the heavy cardboard frame and I just happened to have a small sheet of 1/16" plexiglass that was big enough to use for the frame.  I found a roll of #22 ga enameled wire (dang stuff was not heat strippable though) and used that for both loops.  The junkbox gave up a 7-50 pf air variable that also got used.  Took a bit longer than 10 minutes on the kitchen table to make it, but it is reasonably sturdy.  The extra handle is some nylon rod I had laying around and after slotting it with the bandsaw, I used some 1/8" brass tubing to pin it in place.

The RF connector is a 4 hole panel mount SMA female that came out of some surplus military gear that got scrapped for parts.

5 turns in a 6.5" diameter loop for the big one and 1 turn in 4.5" for the little one.  

It will just resonate at 7.040 MHz with the 50 pf variable almost completely meshed and it is directional on 40 meters.  I plugged my 7.040 Bayou Jumper crystal into the crystal tester I have and turned it on.  I hooked the loop to my KD1JV ATS-2 which on 40 meters, powers up on 7.040.  I could hear the crystal tester's oscillator on 7.040 anywhere in the house and in most of the yard (the ATS-2 is quite sensitive) and even within 2 feet of the tester, I could get an audible null with the loop even unshielded (I don't see a way to make a shielded loop out of this one).  The actual null is not quite at a right angle to the loop, but about 20 degrees off but that's probably due to the fact that it was hastily made and there is nothing really precision about the circumference of the loop.  It is, however very usable and should do nicely for it's temporarily intended purpose - LOL.

Jim - W0EB




------ Original Message ------
Sent: 2/9/2017 12:07:27 PM
Subject: Re: [4sqrp] Fwd: Ocon Oscillator Hunt

Just to prime the pump a bit on the huffduff (HF DF) activity at OzarkCon, I've posted in the Files area of this Group a one-page PDF document showing how I cobbled together a small loop on the kitchen counter in about 10 minutes. Note that this is not (yet) a shielded loop.

It has a very sharp resonance that can be found by peaking the noise It does show directivity, but not much on 40 m right now to test with. On 30 m it was clear there was directivity. Being a very small loop it's not very efficient so signals (and external noise) are way down. It was also apparent that the noise at this QTH was directional

Jim, N5IB

 


Re: Ocon Oscillator Hunt

Jim Sheldon
 

Thanks for this one Jim.  I really didn't like the heavy cardboard frame and I just happened to have a small sheet of 1/16" plexiglass that was big enough to use for the frame.  I found a roll of #22 ga enameled wire (dang stuff was not heat strippable though) and used that for both loops.  The junkbox gave up a 7-50 pf air variable that also got used.  Took a bit longer than 10 minutes on the kitchen table to make it, but it is reasonably sturdy.  The extra handle is some nylon rod I had laying around and after slotting it with the bandsaw, I used some 1/8" brass tubing to pin it in place.

The RF connector is a 4 hole panel mount SMA female that came out of some surplus military gear that got scrapped for parts.

5 turns in a 6.5" diameter loop for the big one and 1 turn in 4.5" for the little one.  

It will just resonate at 7.040 MHz with the 50 pf variable almost completely meshed and it is directional on 40 meters.  I plugged my 7.040 Bayou Jumper crystal into the crystal tester I have and turned it on.  I hooked the loop to my KD1JV ATS-2 which on 40 meters, powers up on 7.040.  I could hear the crystal tester's oscillator on 7.040 anywhere in the house and in most of the yard (the ATS-2 is quite sensitive) and even within 2 feet of the tester, I could get an audible null with the loop even unshielded (I don't see a way to make a shielded loop out of this one).  The actual null is not quite at a right angle to the loop, but about 20 degrees off but that's probably due to the fact that it was hastily made and there is nothing really precision about the circumference of the loop.  It is, however very usable and should do nicely for it's temporarily intended purpose - LOL.

Jim - W0EB




------ Original Message ------
From: "n5ib@... [4sqrp]" <4sqrp@...>
Sent: 2/9/2017 12:07:27 PM
Subject: Re: [4sqrp] Fwd: Ocon Oscillator Hunt

Just to prime the pump a bit on the huffduff (HF DF) activity at OzarkCon, I've posted in the Files area of this Group a one-page PDF document showing how I cobbled together a small loop on the kitchen counter in about 10 minutes. Note that this is not (yet) a shielded loop.

It has a very sharp resonance that can be found by peaking the noise It does show directivity, but not much on 40 m right now to test with. On 30 m it was clear there was directivity. Being a very small loop it's not very efficient so signals (and external noise) are way down. It was also apparent that the noise at this QTH was directional

Jim, N5IB

 


Re: Member List

davemrtn
 

On the OzarkCon web page, you can look at the 'Attendee Roster' page (in the menu on the left) and find your registration, and yes it shows you in the first build session.

David Martin - NA1MH - Mountain Home, Ar. -----------------------------------------

On 2/9/2017 14:50, WI4T wi4t@... [4sqrp] wrote:
 

Yes I did sign up for the build, I should be in the first group.  Also signed up for the banquet dinner.  See you there and thanks.

On Feb 9, 2017, at 1:08 PM, WA0ITP <wa0itp@...> wrote:

Welcome aboard Greg, glad to have you in the Group. Looking forward to an eyeball in Branson.  Did you sign up for the Build Session?
72 WAØITP
I love this radio stuff.
www.wa0itp.com
www.4sqrp.com
On 2/9/2017 10:12 AM, wi4t@... [4sqrp] wrote:

I am one of the new guys - WI4T (Greg) from near Jerico Springs Missouri and I am coming to OzarkCon...  just saying :>)


I have been a ham for 30 years and am currently installing a 90' Rohn 25 if I can find a climber (I climb but had heart surgery 1 year ago and trying to decide if I should climb that high).   Also I have ordered a LM-470 which should be here in a month or so for my Cubex Mark IV extended boom quad (30 foot boom with 4 - 26 foot spreaders.  Should do a good job on QRP.

I look forward to meeting people at OzarkCon!

Greg





Re: Member List

WI4T <wi4t@...>
 


Yes I did sign up for the build, I should be in the first group.  Also signed up for the banquet dinner.  See you there and thanks.

On Feb 9, 2017, at 1:08 PM, WA0ITP <wa0itp@...> wrote:

Welcome aboard Greg, glad to have you in the Group. Looking forward to an eyeball in Branson.  Did you sign up for the Build Session?
72 WAØITP
I love this radio stuff.
www.wa0itp.com
www.4sqrp.com
On 2/9/2017 10:12 AM, wi4t@... [4sqrp] wrote:

I am one of the new guys - WI4T (Greg) from near Jerico Springs Missouri and I am coming to OzarkCon...  just saying :>)


I have been a ham for 30 years and am currently installing a 90' Rohn 25 if I can find a climber (I climb but had heart surgery 1 year ago and trying to decide if I should climb that high).   Also I have ordered a LM-470 which should be here in a month or so for my Cubex Mark IV extended boom quad (30 foot boom with 4 - 26 foot spreaders.  Should do a good job on QRP.

I look forward to meeting people at OzarkCon!

Greg




Re: Failed IRF510 in BJ

David Wilcox
 

Voltage 13.5 v, current 430 ma when the BJ is turned on OR off.  Flickers a little up or down when first turned on.  No wonder the IRF510 heats the shack and takes down my SLA JetSki battery over night.  2 amp fuse in line with the positive lead to the BJ.   Originally the BJ was run on a battery but today did the tests with my Astron PS.

Dave K8WPE

Power supply Astron 30 A metered
Current measured by EZ-meter II

On Feb 9, 2017, at 7:23 AM, n5ib@... [4sqrp] <4sqrp@...> wrote:

 

Very likely not a "dead short" failure. The gate structure isn't suposed to pass current at all, so even if it's compromised it may end up being a "lower" resistance path. To make a non-heatsinked TO-220 really hot doesn't take much current. The IRF510 junction-to-ambient thermal resistance is spec'ed at 62 deg C per W. So a couple watts gets you better than a 100 dec C rise. And 2 W at 12 V is just 170 mA or so. That would be some 4 amp-hr per day drained from your battery.

Now, that doesn't take into account heat that is transferred away via the soldered pins, but even if that reduced the temperature rise by a factor of 10, you could get a 50 deg C rise above ambient (90 F - pretty hot to touch) with 8 W. That would be less than 700 mA and wouldn't blow the 1 A fuse.

It would be an interesting and useful interesting data point if you could do a quick measurement of that current before you make the repairs, just to test the above theory.

In normal operation the voltage drop, Source to Drain, is so small with the device fully turned on that the power dissipation is very small as well. With an on-resistance of less than half an ohm, the 750 mA Tx current will cause less than 0.4V drop, and dissipate less than 300 mW. And, in theory, there's no current at all Gate to Source.

Proverb ---  "In theory, there is no difference between theory and practice, but in practice ....."

Jim, N5IB

 


Re: Member List and SSS reminder

Ed Meyer, WG5F
 

I can attest to the fact that a fall from a 55' foot tower hurts like heck.

I can show you the surgery scars to prove it (from 1983).
Lucky I was just a young pup back then or I wouldn't have made it.

72,
-Ed, WG5F-


KD1JV Tribander SOLD

Paul Smith
 

SOLD thanks for the interest

de Paul Smith N0NBD


Sent from Outlook


Re: Member List

WA0ITP
 

Welcome aboard Greg, glad to have you in the Group. Looking forward to an eyeball in Branson.  Did you sign up for the Build Session?
72 WAØITP
I love this radio stuff.
www.wa0itp.com
www.4sqrp.com
On 2/9/2017 10:12 AM, wi4t@... [4sqrp] wrote:

 

I am one of the new guys - WI4T (Greg) from near Jerico Springs Missouri and I am coming to OzarkCon...  just saying :>)


I have been a ham for 30 years and am currently installing a 90' Rohn 25 if I can find a climber (I climb but had heart surgery 1 year ago and trying to decide if I should climb that high).   Also I have ordered a LM-470 which should be here in a month or so for my Cubex Mark IV extended boom quad (30 foot boom with 4 - 26 foot spreaders.  Should do a good job on QRP.

I look forward to meeting people at OzarkCon!

Greg


Re: Failed IRF510 in BJ

Curt
 

Yikes - clearly it should not stay hot in use -- something is amiss.  And the current has to flow from somewhere (the power supply ...). 

Standby for instruction from NM0S (transmitter designer), N5IB and others. 

Okay on refining the pot etc -- all this is part of the building process.  Even the K2 uses a felt washer! 

Curt



On Thursday, February 9, 2017 11:24 AM, David Wilcox wrote:


Curt,

That was one of my questions in this mornings email.

Yes, the BJ still works, in fact worked for a week before I discovered that it was hot.  Touched it while testing for reasons for the drifting problem.  Gets so hot that the middle leg is blue and I had wondered if I had left a soldering iron on while using it out of the case.

Another responder stated that it still gives reverse voltage protection if damaged by reverse voltage.  I had applied reversed voltage a few nights ago or maybe longer and praised the kit designer for protecting old or dumb farts like me.  

The rig still works, drifts intermittently, sometimes faster, sometimes slower.  During my first QSO it didn't drift enough to have to retune though, a nasty thought, because I would probably lose the contact while retuning.  Very touchy.  The shaft of the tuning pot wobbles, more than the shafts of the other supplied pots.  If I attach the tuning knob firmly against the faceplate it is much more stable and easier to tune.  Am going to apply some green felt behind the knob.  Remember that from the early days of radio, to help a knob tune smoothly and not scratch the cabinet?  

Dave K8WPE

On Feb 9, 2017, at 10:39 AM, wb8yyy@... [4sqrp] <4sqrp@...> wrote:

 
The IRF510 can take a large current from drain to source, and get very hot without damage -- I learned this the 'hot way' in connecting my Magic Box up to a tuna tin 2 type keying circuit (that has bias on its key interface) from a transmitter I had copied from N5IB (interesting this was the original BJ version!).  Just because the IRF510 got very hot does not mean it is dead -- this would likely gate damage to the gate to be dead in a normal 12 volt PA application.  I hope you tried to use the BJ after discovery of the hot device?  No need to add to the email chain if the device is dead, and is being replaced. 

everyone should keep building in spite of this kind of issues -- it is part of the adventure. 

73 Curt



Re: Failed IRF510 in BJ

Tim
 

I had the same issue, IMHO I think there are some mosfet copies floating around that may be of questionable origin. I had some NOS from past projects and replaced mine and tested the reverse protection several times with no failure.
YRMV
Tim W4YN


Re: For Sale KD1JV Tri-Bander

bobby rolph
 

If you still have the rig can you send me a picture or two Paul?

rolph981@...

Bobby Rolph


Re: Member List

Bill Cromwell
 

If you want everybody on the list to be at the Con you will have to move it here or boot me out. That's why.

73,

Bill KU8H

On 02/08/2017 11:01 PM, Tim McDonough N9PUZ wrote:
There are people who come to OzarkCon from Michigan now! Why move?

:-) Tim N9PUZ

On 2/8/2017 9:28 PM, Bill Cromwell wrcromwell@gmail.com [4sqrp] wrote:


Here ya go...

Move OzarkCon to Grayling Michigan!

73,

Bill KU8H

On 02/08/2017 09:07 PM, David Martin davemrtn@centurytel.net [4sqrp] wrote:

That would be a 'historic' OzarkCon event !

How do we make it happen !!! ????

David Martin - NA1MH <https://www.qrz.com/lookup/na1mh> - Mountain
Home, Ar. -----------------------------------------
On 2/8/2017 19:41, ktalbott ktalbott@gamewood.net [4sqrp] wrote:
It would be interesting to see them all at Ozarkcon!
Ken ke4rg


Sent from Samsung Mobile



-------- Original message --------
From: "Johnny Matlock jomatlock@gmail.com [4sqrp]"
<4sqrp@yahoogroups.com>
Date: 02/08/2017 5:54 PM (GMT-05:00)
To: 4sqrp@yahoogroups.com,davemrtn <davemrtn@centurytel.net>
Subject: Re: [4sqrp] Member List


Look out SKCC here we come!!
Thanks for the info Dave
Johnny AC0BQ
On Wed, Feb 8, 2017 at 1:40 PM davemrtn davemrtn@centurytel.net
<mailto:davemrtn@centurytel.net> [4sqrp] <4sqrp@yahoogroups.com
<mailto:4sqrp@yahoogroups.com>> wrote:

WOW !!!

I see the 4SQRP member count very recently surpassed 1300.

Way to go 4SQRP team and members.

David -NA1MH



Sent from my Verizon, Samsung Galaxy smartphone

--
Sent from Gmail Mobile
--
bark less - wag more

.
--
bark less - wag more


Re: Ocon Oscillator Hunt

Jim, N5IB
 

Just to prime the pump a bit on the huffduff (HF DF) activity at OzarkCon, I've posted in the Files area of this Group a one-page PDF document showing how I cobbled together a small loop on the kitchen counter in about 10 minutes. Note that this is not (yet) a shielded loop.

It has a very sharp resonance that can be found by peaking the noise It does show directivity, but not much on 40 m right now to test with. On 30 m it was clear there was directivity. Being a very small loop it's not very efficient so signals (and external noise) are way down. It was also apparent that the noise at this QTH was directional

Jim, N5IB

 


For Sale KD1JV Tri-Bander

Paul Smith
 

I have a KD1JV Tri-Bander for sale. It is built for 80, 40 and 30 meters. This was my favorite rig until I converted to Elecraft. Paypal ok and will ship priority for $150.00 Have picture can send.


Thanks

de Paul N0NBD


Sent from Outlook


Re: Member List and SSS reminder

WI4T <wi4t@...>
 

Thanks guys, I have fallen off the roof putting up an antenna 7 years ago, broke ribs in 11 places,  punctured my lung and a long recovery… at the time I wished it had been 100 foot for sure!

I have a 1600’ sky loop up 50 foot in my trees….this is a killer antenna on 160 meters and 2.0 SWR or less on all HF bands so tunes well.   I have a 180 acre farm with the perfect tree layout around one of the fields.  I also have a hex beam up about 25 feet.  So I have been active on the HF including 6 meters.  I will check-out the net if not in Church at that time.

Greg


On Feb 9, 2017, at 11:04 AM, John R. Lonigro <jonigro@...> wrote:

Greg:

I suspect falling from 40-50' hurts more than from 100' (hi).  Nevertheless, I also recommend asking a younger, experienced person to do the climbing for you.  Buy him a 6-pack of his favorite brew, but don't let him drink any until he's back on the ground.

In the meantime, string up a wire and try your hand at the Second Sunday Sprint this Sunday evening from 7:00-9:00 pm CST.  Go to the 4SQRP website (on air activities) for full details.  An NVIS antenna might work better for the SSS than a beam antenna on a high tower, except possibly for our coastal members.

72,

John, AA0VE
4SQRP Contest Coordinator


On 02/09/2017 10:35 AM, WI4T wi4t@... [4sqrp] wrote:
I have all the equipment (gin pole, harness etc… but I am only comfortable up to 40-50 foot… I might start and get at least that high but have not made a firm decision yet. I have several volunteers for the “ground” crew.  I have the concrete going in for the anchors and both towers next week.  It will be nice to see progress!  The LM-470 base will need to sit 30 days before attaching the tower to it. but the Rohn should be ready in a couple weeks.

Greg - WI4T

BTW nice to meet you guys


On Feb 9, 2017, at 10:29 AM, Paul Smith <n0nbd@...> wrote:

Hello and WELCOME Greg,
Leave the climbing for a younger person. I had bypass surgery 15 years ago and still dont climb..... I do have a tilt over tower..... CU in Branson in a few weeks de Paul Smith N0NBD
Ozarkcon Chairman
Sent from Outlook



From: 4sqrp@... <4sqrp@...> on behalf of wi4t@... [4sqrp] <4sqrp@...>
Sent: Thursday, February 9, 2017 4:12 PM
To: 4sqrp@...
Subject: Re: [4sqrp] Member List
 
I am one of the new guys - WI4T (Greg) from near Jerico Springs Missouri and I am coming to OzarkCon...  just saying :>)

I have been a ham for 30 years and am currently installing a 90' Rohn 25 if I can find a climber (I climb but had heart surgery 1 year ago and trying to decide if I should climb that high).   Also I have ordered a LM-470 which should be here in a month or so for my Cubex Mark IV extended boom quad (30 foot boom with 4 - 26 foot spreaders.  Should do a good job on QRP.

I look forward to meeting people at OzarkCon!

Greg




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