Re: [Elecraft] KPA1500 in the IARU Contest Last weekend

[Jim Brown]

On 7/15/2020 1:36 PM, CUTTER DAVID wrote:
It's all about size.  Bigger core helps, 


Dave,

No, it is NOT about size. It is about design of the entire antenna 
system, including the antenna, the feedline, and other parts needed to 
make the SYSTEM work. The principal characteristic of a common mode 
choke is the resistive component of its common mode impedance at the 
operating frequency(ies) where it will be used. Further, dissipation in 
the choke occurs at least as much in the WIRE that is wound around the 
core as in the core itself.


There is another fundamental error in many antenna systems that ONLY 
looks at matching to the transmitter at the transmitter, ignoring the 
match between the antenna and the transmission line, using high 
impedance, parallel wire line, and using a random center-fed or 
off-center fed horizontal wire on all bands. Yes, the transmitter can be 
made to supply power to the feedline, yes, it will get to the antenna, 
and yes, it will radiate. But it may not receive all that well due to 
common mode current on the line from noise sources in our own homes and 
those of our neighbors. THAT is the problem with using a decades-old 
design for a world where there was 20 dB less noise than most of us face 
today.


so a core that is OK for ssb
and cw might be undersized for AM or some data modes. Just like linear 
amplifiers.


So it is NOT the size of the core, it's the design of the antenna 
system. HFTA author and retired ARRL Antenna Book and Handbook editor 
Dean Straw, N6BV, published an excellent piece in QST 6-8 years ago 
called "Don't Blow Up Your Balun," in which he pointed out the 
differential mode dissipation in chokes, which can be extremely high if 
the choke is at a very high current point in a mismatched line. When he 
passed it to me for review, I noted that these losses were in addition 
to the common mode dissipation, and he revised the piece to reflect that.


 you can't

label something poorly designed because it doesn't pass the BOK test.


BOK?

73, Jim K9YC

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Re: [Elecraft] Waterproof SO-239 covers

[Gary K9GS]

I'm a big fan of rescue tape too.  No adhesive and cuts away very easily with a 
sharp blade.Home Depot sells a version:Nashua Tape  1 in. x 3.33 yd. 
Stretch and Seal Self-Fusing Silicone Tape in 
Blackhttps://www.homedepot.com/p/Nashua-Tape-1-in-x-3-33-yd-Stretch-and-Seal-Self-Fusing-Silicone-Tape-in-Black-1208952/100206050Walmart
 carries it 
too:https://www.walmart.com/ip/RESCUE-TAPE-Original-Silicone-Self-Fusing-Multi-Purpose-Tape-Orange/21154031?wmlspartner=wlpa=11052&=2280==g=m=42423897272=pla-51320962143=9018799pla=117084351=online=21154031=sem=Cj0KCQjw0rr4BRCtARIsAB0_48MwYg3GYwxdnjFhsIbmpsQ4jhZ71aSUBZ8PhIGpokraWc5Wm6juwfQaAjzUEALw_wcB73,Gary
 K9GS
 Original message From: Ted Edwards W3TB  
Date: 7/15/20  8:00 PM  (GMT-06:00) To: Gary K9GS  Cc: 
Elecraft Reflector  Subject: Re: [Elecraft] 
Waterproof SO-239 covers First prepare an old PL-259 like Gary K9GS said.Then 
go shopping in the plumbing area — not in electrical — and buy Rescue Tape.  It 
stretches around that PL-259 to seal it up and sticks to itself rather than to 
the connector.  Be careful because you won’t be able to unwind it but will peak 
away when cut it with a knife.  And being a plumbing product it will seal to 
water.  It comes in colors. I use it for all my outdoor connections. Good 
stuff!And I have wondered about those Flex Seal products we see on TV.On Wed, 
Jul 15, 2020 at 20:09 Gary K9GS  wrote:
Hi Doug,I've never done this but why not take a PL259, fill it with RTV or 
epoxy, let cure, install on the SO239, and then weatherproof like you would 
normally do?73,Gary K9GS
 Original message From: Doug Daniels  Date: 
7/15/20  4:04 PM  (GMT-06:00) To: Elecraft Reflector  
Subject: [Elecraft] Waterproof SO-239 covers I just built a window antenna 
feedthrough panel, and want some waterproofcovers for the unused bulkhead 
connectors. Most of the online reviews saythat even the ones advertised to be 
waterproof are in fact not waterproof.Anyone have a source for ones that are?-- 
--... 
...--Doug__Elecraft 
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-- 73 de Ted Edwards, W3TB and GØPWWand thinking about operating CW:"Do today 
what others won't,so you can do tomorrow what others can't."
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Re: [Elecraft] Waterproof SO-239 covers

[Dave Cole]

American Radio Supply sells metal covers that thread onto SO-239, and 
have a soft rubber insert.  I have been using them on outdoor connectors 
for years now, and they work well...


73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist
ARRL Asst. Director, NW Division, Technical Resources

On 7/15/20 6:50 PM, Drew AF2Z wrote:
I would use Coax Seal. Same idea as duct seal but it's more pliable, 
more wx resistant and a little stickier. It will last forever, never 
hardens and can be peeled off when needed. Might want to screw pl-259 
shells onto the socket threads first, then seal them. The sockets & 
shells will be pristine when you go to use them.


73,
Drew
AF2Z



On 07/15/20 18:52, Tommy wrote:
I wrap some duct seal putty around mine. Get it at Home Depot for 
cheap. Works fine. I forget what I paid, around $2-3 for a brick of it 
I think. Stays soft and pliable.


73 de Tom - KB2SMS


On 7/15/20 7:39 PM, Nate Bargmann wrote:

* On 2020 15 Jul 16:07 -0500, Doug Daniels wrote:
I just built a window antenna feedthrough panel, and want some 
waterproof
covers for the unused bulkhead connectors. Most of the online 
reviews say
that even the ones advertised to be waterproof are in fact not 
waterproof.

Anyone have a source for ones that are?

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Re: [Elecraft] Waterproof SO-239 covers

[Drew AF2Z]

I would use Coax Seal. Same idea as duct seal but it's more pliable, 
more wx resistant and a little stickier. It will last forever, never 
hardens and can be peeled off when needed. Might want to screw pl-259 
shells onto the socket threads first, then seal them. The sockets & 
shells will be pristine when you go to use them.


73,
Drew
AF2Z



On 07/15/20 18:52, Tommy wrote:
I wrap some duct seal putty around mine. Get it at Home Depot for cheap. 
Works fine. I forget what I paid, around $2-3 for a brick of it I think. 
Stays soft and pliable.


73 de Tom - KB2SMS


On 7/15/20 7:39 PM, Nate Bargmann wrote:

* On 2020 15 Jul 16:07 -0500, Doug Daniels wrote:
I just built a window antenna feedthrough panel, and want some 
waterproof
covers for the unused bulkhead connectors. Most of the online reviews 
say
that even the ones advertised to be waterproof are in fact not 
waterproof.

Anyone have a source for ones that are?

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[Elecraft] ISO KX-1

[George P Linehan III via Elecraft]

Looking for all bands.   If I locate one, I’ll sell mine with 40,20 a 30 mtr 
board and tuner.  Please advise, Paul WA6YCA Tnx
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Re: [Elecraft] Waterproof SO-239 covers

[Ted Edwards W3TB]

First prepare an old PL-259 like Gary K9GS said.
Then go shopping in the plumbing area — not in electrical — and buy Rescue
Tape.  It stretches around that PL-259 to seal it up and sticks to itself
rather than to the connector.  Be careful because you won’t be able to
unwind it but will peak away when cut it with a knife.

And being a plumbing product it will seal to water.  It comes in colors.

I use it for all my outdoor connections. Good stuff!

And I have wondered about those Flex Seal products we see on TV.

On Wed, Jul 15, 2020 at 20:09 Gary K9GS  wrote:

>
> Hi Doug,I've never done this but why not take a PL259, fill it with RTV or
> epoxy, let cure, install on the SO239, and then weatherproof like you would
> normally do?73,Gary K9GS
>  Original message From: Doug Daniels 
> Date: 7/15/20  4:04 PM  (GMT-06:00) To: Elecraft Reflector <
> elecraft@mailman.qth.net> Subject: [Elecraft] Waterproof SO-239 covers I
> just built a window antenna feedthrough panel, and want some
> waterproofcovers for the unused bulkhead connectors. Most of the online
> reviews saythat even the ones advertised to be waterproof are in fact not
> waterproof.Anyone have a source for ones that are?-- --...
> ...--Doug__Elecraft
> mailing listHome: http://mailman.qth.net/mailman/listinfo/elecraftHelp:
> http://mailman.qth.net/mmfaq.htmPost: mailto:elecr...@mailman.qth.netThis
> list hosted by: http://www.qsl.netPlease help support this email list:
> http://www.qsl.net/donate.htmlMessage delivered to k...@gjschwartz.com
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>
-- 
73 de Ted Edwards, W3TB and GØPWW

and thinking about operating CW:
"Do today what others won't,
so you can do tomorrow what others can't."
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Re: [Elecraft] Waterproof SO-239 covers

[Gary K9GS]

Hi Doug,I've never done this but why not take a PL259, fill it with RTV or 
epoxy, let cure, install on the SO239, and then weatherproof like you would 
normally do?73,Gary K9GS
 Original message From: Doug Daniels  Date: 
7/15/20  4:04 PM  (GMT-06:00) To: Elecraft Reflector  
Subject: [Elecraft] Waterproof SO-239 covers I just built a window antenna 
feedthrough panel, and want some waterproofcovers for the unused bulkhead 
connectors. Most of the online reviews saythat even the ones advertised to be 
waterproof are in fact not waterproof.Anyone have a source for ones that are?-- 
--... 
...--Doug__Elecraft 
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Re: [Elecraft] Waterproof SO-239 covers

[Tommy]

I wrap some duct seal putty around mine. Get it at Home Depot for cheap. 
Works fine. I forget what I paid, around $2-3 for a brick of it I think. 
Stays soft and pliable.


73 de Tom - KB2SMS


On 7/15/20 7:39 PM, Nate Bargmann wrote:

* On 2020 15 Jul 16:07 -0500, Doug Daniels wrote:

I just built a window antenna feedthrough panel, and want some waterproof
covers for the unused bulkhead connectors. Most of the online reviews say
that even the ones advertised to be waterproof are in fact not waterproof.
Anyone have a source for ones that are?

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Re: [Elecraft] Waterproof SO-239 covers

[Nate Bargmann]

* On 2020 15 Jul 16:07 -0500, Doug Daniels wrote:
> I just built a window antenna feedthrough panel, and want some waterproof
> covers for the unused bulkhead connectors. Most of the online reviews say
> that even the ones advertised to be waterproof are in fact not waterproof.
> Anyone have a source for ones that are?

Anything you can slip on or off easily will not be water proof.  I have
used 3M rubber splicing tape to good effect over the years as it is self
vulcanizing.  Stretch it as you wrap it and it will fill the gaps.  Then
wrap it with a couple of layers of 3M Super 88 or 33+ electrical tape to
protect it from uV.

I've not tried what you're doing as I've covered splices (UHF to barrel
to UHF, etc) with this method and the connection at the feedpoint of
antennas.  I've opened them years later and everything is clean and dry.
The nice thing is that rubber will cut and peel away easier than the
butyl of Coax Seal and such.  I do use the butyl on connections for
repeaters, hard line ground kits, and such!

Link to the 3M rubber tape:

https://www.3m.com/3M/en_US/company-us/all-3m-products/~/Scotch-Rubber-Splicing-Tape-23/?N=5002385+8709319+8710676+8730567+3294318588=8710748+8744072=rud


73, Nate, N0NB

-- 

"The optimist proclaims that we live in the best of all
possible worlds.  The pessimist fears this is true."

Web: https://www.n0nb.us
Projects: https://github.com/N0NB
GPG fingerprint: 82D6 4F6B 0E67 CD41 F689 BBA6 FB2C 5130 D55A 8819

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Re: [Elecraft] Waterproof SO-239 covers

[jimw3fa]

Doug not knowing if you are looking for commercial solutions or McGyver ideas. 
I would think that old rubber hose pieces that fit snug or close held on with 
hose clamps should work. The end opposite the feed thru could be sealed with 
silicone or left open if a few inches from the wall. I have also used old leaky 
garden hose over top of hydraulic hoses subjected to vibration rubbing or 
running RG cables inside of the hose that are exposed for additional 
protection.Just a cheap solution.JimSent via the Samsung Galaxy Note9, an AT 
5G Evolution capable smartphone
 Original message From: Doug Daniels  Date: 
7/15/20  17:06  (GMT-05:00) To: Elecraft Reflector  
Subject: [Elecraft] Waterproof SO-239 covers I just built a window antenna 
feedthrough panel, and want some waterproofcovers for the unused bulkhead 
connectors. Most of the online reviews saythat even the ones advertised to be 
waterproof are in fact not waterproof.Anyone have a source for ones that are?-- 
--... 
...--Doug__Elecraft 
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Re: [Elecraft] KPA1500 in the IARU Contest Last weekend

[CUTTER DAVID via Elecraft]

Size is the most important parameter. 
 
I've read your tutorials several times and they are an inspiration but it's 
just like linear amplifiers: you can't say an amplifier designed for 
intermittent service like ssb or cw is poorly designed because it doesn't pass 
the BOK test. It's horses for courses. A properly designed choke for an ocfd 
will not over-heat but these are few and far between it seems.

David G3UNA/G6CP

> On 15 July 2020 at 21:07 Jim Brown  wrote:
> 
> 
> On 7/15/2020 11:46 AM, CUTTER DAVID via Elecraft wrote:
> > Ferrite-cored chokes (balun) heat up and change apparent swr.
> 
> Not if they are properly designed and properly applied. And not all 
> antennas can be choked -- in general, only resonant antennas can be 
> effectively choked. Chokes applied to non-resonant and/or poorly 
> balanced antennas (like OCF wires) are, in general, NOT effective, and 
> WILL likely overheat.
> 
> I suggest a study of
> k9yc.com/RFI-Ham.pdf and
> http://k9yc.com/2018Cookbook.pdf
> 
> 73, Jim K9YC
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[Elecraft] Waterproof SO-239 covers

[Doug Daniels]

I just built a window antenna feedthrough panel, and want some waterproof
covers for the unused bulkhead connectors. Most of the online reviews say
that even the ones advertised to be waterproof are in fact not waterproof.
Anyone have a source for ones that are?

-- 

--... ...--
Doug
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Re: [Elecraft] KPA1500 in the IARU Contest Last weekend

[CUTTER DAVID via Elecraft]

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Re: [Elecraft] KPA1500 in the IARU Contest Last weekend

[Jim Brown]

On 7/15/2020 11:46 AM, CUTTER DAVID via Elecraft wrote:

Ferrite-cored chokes (balun) heat up and change apparent swr.


Not if they are properly designed and properly applied. And not all 
antennas can be choked -- in general, only resonant antennas can be 
effectively choked. Chokes applied to non-resonant and/or poorly 
balanced antennas (like OCF wires) are, in general, NOT effective, and 
WILL likely overheat.


I suggest a study of
k9yc.com/RFI-Ham.pdf and
http://k9yc.com/2018Cookbook.pdf

73, Jim K9YC
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[Elecraft] [WTB] Late-model bare bones K3 or K3S with SUB

[wc1m73]

I'm looking for a clean bare-bones 100W K3 or K3S with SUB, serial number
8000 or higher, with or without the new synth boards, no added filters, no
add-ons.

 

Thanks & 73,

Dick WC1M

 

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Re: [Elecraft] Fwd: Re[2]: K2 7747 VCO alignment problem

[Don Wilhelm]

I made an error in checking K14 and K15 while on 80 meters.
It should have been conductivity between pins 2 and 3 and open between 
pins 3 and 4.
The state of the other side was correct - continuity between pins 8 and 
9 and open between 7 and 8.


73,
Don W3FPR
--
Keith,

C74 could explain a problem on 30, 20, and 12 meters, but you apparently 
have something else awry.


If you do not find a problem with the relay coils, you should next check 
the contacts of relays K13, K14 and K15.
On 20 meters, all the relays should be set - meaning you should have 
conductivity from pins 3 to 4 and not between pins 2 and 3.
Check the other side of the relays - conductivity between pins 7 and 8, 
and open between pins 8 and 9


Then check 80 meters, only K13 should be set - so check K14 and K15 
which are reset on that band - no conductivity between pins 4 and 3 and 
open between pins 2 and 3
Also check the other side, conductivity between pins 8 and 9 and open 
between 7 and 8.


Then switch to 30 meters and you can check the reset state of K13 -
Continuity between pins 2 and 3 and open between pins 3 and 4
Also conductivity between pins 8 and 9 and open between pins 7 and 8.

If all that checks out, look again at the capacitor values of C71, C72, 
and C73. I know some of those capacitors are tight tucked between the 
relays, but bend them over a bit and use a good light and possibly a 
magnifier to read the markings.


73,
Don W3FPR


On 7/13/2020 11:00 PM, Keith Hamilton wrote:

OK Dave -

I will check the relays as you suggest. In troubleshooting capacitors I
messed up
C74. I pulled it off the board and sent a request to Elecraft for a
replacement.
That may solve the problem. In the meantime I will check the coils on the
K13 to K15
relays and let you know what I find.

I did not see Don's post. I will check it out. So I will be waiting a bit
to fix this problem,

73 and thanks!
Keith N8CEP

On Mon, Jul 13, 2020 at 10:36 PM Dave Van Wallaghen  
wrote:



Keith,

I saw Don respond to this and he is right that K15 would be the common
denominator if not for 15m. You can check to see if the coils are intact
if you measure the resistance between pins 1 and 10 for each. It should
be around 230 ohms or so. If you find one open or well away from that
resistance, then it would indicate a bad coil on that relay.

You can also measure the intended path through the relays for each band
and make sure there are no unintended paths. If you can read the
schematic, it shows the path with each relay in it's reset state. You
would need to consult the table in Appendix B to see which relay(s) are
active for a respective band and you can then measure the continuity of
the intended path. You should also check any unintended paths which
could indicate a problem.

As Don stated, this is not a fun problem to find and will take some good
debugging skills. So far, everything you've indicated seems to suggest
the PLL oscillator and VCO circuits are working properly, but the range
selection area is not producing the proper capacitance to allow the VCO
to produce the proper frequency on those bands you indicated.

If reading the schematic is a problem, let us know and I am sure between
Don and myself, we can give you some step by step instructions for
tracing through this problem.

73,
Dave W8FGU

-- Original Message --
From: "Keith Hamilton" 
To: elecraft@mailman.qth.net
Sent: 7/13/2020 9:34:03 PM
Subject: [Elecraft] Fwd: Re[2]: K2 7747 VCO alignment problem


-- Forwarded message -
From: Keith Hamilton 
Date: Mon, Jul 13, 2020 at 9:19 PM
Subject: Re: Re[2]: [Elecraft] K2 7747 VCO alignment problem
To: Dave Van Wallaghen 


Dave

Yes the frequency changes when turning the VFO knob when measuring with

CAL

FCTR on TP1.

I have checked the markings on C71, C72, C73, and C74 (C75 is not

installed

yet). They are
all correct and I resoldered them to be sure.

I am beginning to think I might have a bad relay K13, K14 or K15. My 
good

bands are 80,40 and
15 meters. My bad bands are 30,20,17,12 and 10 meters. Looking at the

relay

table in appendix B
I am not sure which relay could be bad. How can I test them? Should 
I try

to replace them?
73,
Keith N8CEP


On Mon, Jul 13, 2020 at 4:58 PM Dave Van Wallaghen 

wrote:



Ok Keith, just to make sure things are where we want on the bands that
seem to work, does the frequency change when turning the VFO knob when
measuring with CAL FCTR on TP1? If they do, then things are working ok.

For the bands that are locked at 8.28v, that is the max output from the
integrator circuit (U6B). This means that there is no lock between the

PLL

Oscillator and the VCO circuit and the PLL chip (U4) is trying to

drive the

varactors to provide more capacitance to the VCO circuit. The most

likely

cause will be a misplaced capacitor in the VCO range selector (C71 -

C75)

Re: [Elecraft] Matching resonant antennas

[Ken WA8JXM]

Yes, a resonant half wave dipole can have a feedpoint impedance of 5 ohms
to 90 ohms (SWR 10:1 to 1.8:1), but it's still resonant.

Conversely, a non-resonant antenna can have a 1:1 SWR.

Ken WA8JXM

On Wed, Jul 15, 2020 at 12:34 PM Andy Durbin  wrote:

> "A correspondent asked me why I needed to tune a resonant antenna."
>
> Perhaps the question should have been "why may you need to match the
> impedance of a resonant antenna".   The answer may be that not all resonant
> antennas are 50 ohm.   Resonance only means that inductive and capacitive
> reactance are equal magnitude. Resonance says nothing about the value of R.
>
> Andy, k3wyc
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Re: [Elecraft] Fwd: Re[2]: K2 7747 VCO alignment problem

[Don Wilhelm]

Keith,

C74 could explain a problem on 30, 20, and 12 meters, but you apparently 
have something else awry.


If you do not find a problem with the relay coils, you should next check 
the contacts of relays K13, K14 and K15.
On 20 meters, all the relays should be set - meaning you should have 
conductivity from pins 3 to 4 and not between pins 2 and 3.
Check the other side of the relays - conductivity between pins 7 and 8, 
and open between pins 8 and 9


Then check 80 meters, only K13 should be set - so check K14 and K15 
which are reset on that band - no conductivity between pins 4 and 3 and 
open between pins 2 and 3
Also check the other side, conductivity between pins 8 and 9 and open 
between 7 and 8.


Then switch to 30 meters and you can check the reset state of K13 -
Continuity between pins 2 and 3 and open between pins 3 and 4
Also conductivity between pins 8 and 9 and open between pins 7 and 8.

If all that checks out, look again at the capacitor values of C71, C72, 
and C73.  I know some of those capacitors are tight tucked between the 
relays, but bend them over a bit and use a good light and possibly a 
magnifier to read the markings.


73,
Don W3FPR


On 7/13/2020 11:00 PM, Keith Hamilton wrote:

OK Dave -

I will check the relays as you suggest. In troubleshooting capacitors I
messed up
C74. I pulled it off the board and sent a request to Elecraft for a
replacement.
That may solve the problem. In the meantime I will check the coils on the
K13 to K15
relays and let you know what I find.

I did not see Don's post. I will check it out. So I will be waiting a bit
to fix this problem,

73 and thanks!
Keith N8CEP

On Mon, Jul 13, 2020 at 10:36 PM Dave Van Wallaghen  wrote:


Keith,

I saw Don respond to this and he is right that K15 would be the common
denominator if not for 15m. You can check to see if the coils are intact
if you measure the resistance between pins 1 and 10 for each. It should
be around 230 ohms or so. If you find one open or well away from that
resistance, then it would indicate a bad coil on that relay.

You can also measure the intended path through the relays for each band
and make sure there are no unintended paths. If you can read the
schematic, it shows the path with each relay in it's reset state. You
would need to consult the table in Appendix B to see which relay(s) are
active for a respective band and you can then measure the continuity of
the intended path. You should also check any unintended paths which
could indicate a problem.

As Don stated, this is not a fun problem to find and will take some good
debugging skills. So far, everything you've indicated seems to suggest
the PLL oscillator and VCO circuits are working properly, but the range
selection area is not producing the proper capacitance to allow the VCO
to produce the proper frequency on those bands you indicated.

If reading the schematic is a problem, let us know and I am sure between
Don and myself, we can give you some step by step instructions for
tracing through this problem.

73,
Dave W8FGU

-- Original Message --
From: "Keith Hamilton" 
To: elecraft@mailman.qth.net
Sent: 7/13/2020 9:34:03 PM
Subject: [Elecraft] Fwd: Re[2]: K2 7747 VCO alignment problem


-- Forwarded message -
From: Keith Hamilton 
Date: Mon, Jul 13, 2020 at 9:19 PM
Subject: Re: Re[2]: [Elecraft] K2 7747 VCO alignment problem
To: Dave Van Wallaghen 


Dave

Yes the frequency changes when turning the VFO knob when measuring with

CAL

FCTR on TP1.

I have checked the markings on C71, C72, C73, and C74 (C75 is not

installed

yet). They are
all correct and I resoldered them to be sure.

I am beginning to think I might have a bad relay K13, K14 or K15. My good
bands are 80,40 and
15 meters. My bad bands are 30,20,17,12 and 10 meters. Looking at the

relay

table in appendix B
I am not sure which relay could be bad. How can I test them? Should I try
to replace them?
73,
Keith N8CEP


On Mon, Jul 13, 2020 at 4:58 PM Dave Van Wallaghen 

wrote:



  Ok Keith, just to make sure things are where we want on the bands that
  seem to work, does the frequency change when turning the VFO knob when
  measuring with CAL FCTR on TP1? If they do, then things are working ok.

  For the bands that are locked at 8.28v, that is the max output from the
  integrator circuit (U6B). This means that there is no lock between the

PLL

  Oscillator and the VCO circuit and the PLL chip (U4) is trying to

drive the

  varactors to provide more capacitance to the VCO circuit. The most

likely

  cause will be a misplaced capacitor in the VCO range selector (C71 -

C75)

  or a problem in the VCO circuit itself. But because this may be band
  dependent, I would look first in that range selection circuit. Verify

that

  those caps are the proper values. They are easily misread and will

cause

  the type of thing you are seeing.

  Also verify those varactor diodes are the proper type and in the right
  places. Soldering issues are 

[Elecraft] KXV3 GAP1

[Juha - oh6os]

Hello,

I burned out GAP1 on KXV3 board, too much RF, hi.

What is this component? Overvoltage? Need to know to chage it. Tnx.

juha oh6os



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[Elecraft] K3/0 Mini and Win4K3 -- digital remote operation

[Darryl Hazelgren]

I am posting this message on the Remoterig forum as well as sending it to 
Elecraft (and anywhere else I can think of) to try to make some headway. 

In short: I wish to operate digital modes from my control station to my remote 
station using K3 Twin mode of Remoterig setup (K3/0 Mini and K3 100). Have been 
using the setup for eight years using CW and SSB. Want to add Win4K3 to the 
control side. Want to (continue to) run N1MM+, DXLab Suite and add WSJT 
software on the control side.

Can this be done?

I also so have a Rigblaster that I can add to the mix. Do I need that or any 
other hardware or software?

Below is an email sent to Tom at Win4K3 along with his response.



 Original message 
From: Darryl Hazelgren 
Date: 2020-07-15 1:07 p.m. (GMT-05:00)
To: supp...@va2fsq.com
Subject: Help with K3/0 remote setup

Good morning Tom.

I have been successfully running a remote station using an Elecraft K3 at the 
remote site and Elecraft K3/0, K3/0 Mini and K3 100 rigs at the control site in 
my condo, which is about 15 miles away from the remote site, for about eight 
years. I am using Remoterig RRC 1258 MkII boxes in the twin mode. Software is 
current.

I run a KPA1500 which I control with the KPA1500 remote software. All antenna 
switching and rotating of Yagis is done with Green Heron and Array Solutions 
hardware and software.

I am a DXer and Contester (Phone and CW) using N1MM+ and DXLab Suites.

Now I want to start with the digital modes.

The computers on both sides are Windows 10 with latest updates. I downloaded 
the latest Com0Com software and created three pairs for use with N1MM+, DXLab 
and WSJT.

I downloaded the current Win4K3 app and began the setup. I am unable to advance 
beyond the Settings screen as I cannot get the K3/0 Mini drop down to connect. 
I have tried the virtual Com ports created by the Remoterig install app. I have 
connected to the USB port on the K3/0 Mini and verified that I have the latest 
version of software in the K3/0 Mini and noted the two ports the Mini uses. I 
have tried to connect via those. No joy.

The last two pages of the instruct me to: "Save the settings and then from the 
Tools menu on the radio control screen pick "Enable K3 / 0”. I cannot get to 
the next screen to access the Tools menu.

What am I missing?

I have friends using Win4K3 and they love it. I’m looking forward to joining 
them...

Answer from Tom, VA2FSQ:

Hi
I do not have a remote rig so I am not sure how this works.
However, before you can go to the other connections, you must have win4k3 
working and connected. Win4k3 uses pretty well all k3 commands including some 
undocumented ones for the k30 and I cannot say for sure of this will work with 
remote rig. I will say, you cannot connect to the radio with any virtual ports 
unless it is properly managed by remote rig. All other connections have to be 
through win4k3.
73
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Re: [Elecraft] KPA1500 in the IARU Contest Last weekend

[CUTTER DAVID via Elecraft]

Ferrite-cored chokes (balun) heat up and change apparent swr.  

David G3UNA/G6CP

> On 15 July 2020 at 17:36 j...@kk9a.com wrote:
> 
> 
> That is quite an assumption.  A 2el 40m beam with large efficient  
> High-Q loading coils will have less bandwidth than for example one of  
> the popular US manufactured beams that use 68 turns of small wire in  
> each coil.  The latter is more likely to have heating issues.  I have  
> never noticed any SWR changes or amplifier re-tuning with my 40m  
> OptiBeams during heavy use.
> 
> John KK9A
> 
> 
> Jim Miller AB3CV wrote:
> 
> Since it is so narrow I suspect it may be a trapped design or have loading
> coils which at 1500w may be heating and detuning as a result.
> 
> 73
> 
> jim ab3cv
> 
> On Wed, Jul 15, 2020 at 11:45 AM Ray Spreadbury via Elecraft <
> elecraft at mailman.qth.net> wrote:
> 
> >
> >
> > A correspondent asked me why I needed to tune a resonant antenna.
> > The reason was because although the Yagi was tuned to resonate at about
> > 7.130MHz it unfortunately has a rather narrow bandwidth. I needed to
> > operate SSB in this contest in ITU Region 1 SSB, which is between 7.080MHz
> > and 7.200MHZ. At 7.080MHz the SWR (with tuner bypassed) was 1.75:1 & at
> > 7.200 was 1.95:1. I would be operating at power so I preferred to tune for
> > 1.1:1.
> > Yes I know the Yagi is not very good with that narrow bandwidth, but it is
> > what it is. Normally I operate CW only on 40M & tune it to 7.030 with the
> > bandwidth covering the preferred Region 1 CW portion of the band ie7.000 to
> > 7.040 and the tuner is not needed.
> > 73 Ray G3XLG
> 
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Re: [Elecraft] Matching resonant antennas

[Dr. William J. Schmidt]

The obvious issue is not what the radio sees... It's what can happen on the
other side of the transform.  Voltages and currents that no one seems to
care about as long as their radio sees 50 ohms.


Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ 



-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Andy Durbin
Sent: Wednesday, July 15, 2020 11:33 AM
To: elecraft@mailman.qth.net
Subject: [Elecraft] Matching resonant antennas

"A correspondent asked me why I needed to tune a resonant antenna."

Perhaps the question should have been "why may you need to match the
impedance of a resonant antenna".   The answer may be that not all resonant
antennas are 50 ohm.   Resonance only means that inductive and capacitive
reactance are equal magnitude. Resonance says nothing about the value of R.

Andy, k3wyc
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delivered to b...@wjschmidt.com 


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Re: [Elecraft] KPA500 and VSWR

[Randy Farmer]

Good point, Andy. I never thought to use the complex impedance 
measurement capability of the LP-100A to see what the exact load 
impedance was with the old configuration.  If I have occasion to do any 
modifications on my 20-15-10 dipole, I'll try to remember to document 
the before and after load impedances (if it changes anything).


73...
Randy, W8FN

On 7/15/2020 12:25 PM, Andy Durbin wrote:

I have published actual test data that shows the very strong influence of PA 
load on PA dissipation for my KPA500.  SWR is not a good indicator of the load 
mismatch.  You must consider the complex load impedance to see the real picture.


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Re: [Elecraft] KPA1500 in the IARU Contest Last weekend

[john]

That is quite an assumption.  A 2el 40m beam with large efficient  
High-Q loading coils will have less bandwidth than for example one of  
the popular US manufactured beams that use 68 turns of small wire in  
each coil.  The latter is more likely to have heating issues.  I have  
never noticed any SWR changes or amplifier re-tuning with my 40m  
OptiBeams during heavy use.


John KK9A


Jim Miller AB3CV wrote:

Since it is so narrow I suspect it may be a trapped design or have loading
coils which at 1500w may be heating and detuning as a result.

73

jim ab3cv

On Wed, Jul 15, 2020 at 11:45 AM Ray Spreadbury via Elecraft <
elecraft at mailman.qth.net> wrote:




A correspondent asked me why I needed to tune a resonant antenna.
The reason was because although the Yagi was tuned to resonate at about
7.130MHz it unfortunately has a rather narrow bandwidth. I needed to
operate SSB in this contest in ITU Region 1 SSB, which is between 7.080MHz
and 7.200MHZ. At 7.080MHz the SWR (with tuner bypassed) was 1.75:1 & at
7.200 was 1.95:1. I would be operating at power so I preferred to tune for
1.1:1.
Yes I know the Yagi is not very good with that narrow bandwidth, but it is
what it is. Normally I operate CW only on 40M & tune it to 7.030 with the
bandwidth covering the preferred Region 1 CW portion of the band ie7.000 to
7.040 and the tuner is not needed.
73 Ray G3XLG


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[Elecraft] Matching resonant antennas

[Andy Durbin]

"A correspondent asked me why I needed to tune a resonant antenna."

Perhaps the question should have been "why may you need to match the impedance 
of a resonant antenna".   The answer may be that not all resonant antennas are 
50 ohm.   Resonance only means that inductive and capacitive reactance are 
equal magnitude. Resonance says nothing about the value of R.

Andy, k3wyc
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[Elecraft] KPA500 and VSWR

[Andy Durbin]

"With the lower VSWR, I never saw the PA temperature exceed 50°.  I suppose 
this shouldn't come as a surprise, but it does show the PA heating effects of 
even moderate load mismatches on a solid state amplifier designed for a 50 Ohm 
load. Just an anecdote that some may find interesting."

I have published actual test data that shows the very strong influence of PA 
load on PA dissipation for my KPA500.  SWR is not a good indicator of the load 
mismatch.  You must consider the complex load impedance to see the real picture.

For those who missed it the first time, one set of my test data is documented 
here - https://tinyurl.com/y93m99sw

The KPA500 monitor that I created is shown here - https://tinyurl.com/yalv5o6f


Andy, k3wyc


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Re: [Elecraft] KPA1500 in the IARU Contest Last weekend

[Jim Miller]

Since it is so narrow I suspect it may be a trapped design or have loading
coils which at 1500w may be heating and detuning as a result.

73

jim ab3cv

On Wed, Jul 15, 2020 at 11:45 AM Ray Spreadbury via Elecraft <
elecraft@mailman.qth.net> wrote:

>
>
> A correspondent asked me why I needed to tune a resonant antenna.
> The reason was because although the Yagi was tuned to resonate at about
> 7.130MHz it unfortunately has a rather narrow bandwidth. I needed to
> operate SSB in this contest in ITU Region 1 SSB, which is between 7.080MHz
> and 7.200MHZ. At 7.080MHz the SWR (with tuner bypassed) was 1.75:1 & at
> 7.200 was 1.95:1. I would be operating at power so I preferred to tune for
> 1.1:1.
> Yes I know the Yagi is not very good with that narrow bandwidth, but it is
> what it is. Normally I operate CW only on 40M & tune it to 7.030 with the
> bandwidth covering the preferred Region 1 CW portion of the band ie7.000 to
> 7.040 and the tuner is not needed.
> 73 Ray G3XLG
>
>
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[Elecraft] KPA1500 in the IARU Contest Last weekend

[Ray Spreadbury via Elecraft]

A correspondent asked me why I needed to tune a resonant antenna.
The reason was because although the Yagi was tuned to resonate at about 
7.130MHz it unfortunately has a rather narrow bandwidth. I needed to operate 
SSB in this contest in ITU Region 1 SSB, which is between 7.080MHz and 
7.200MHZ. At 7.080MHz the SWR (with tuner bypassed) was 1.75:1 & at 7.200 was 
1.95:1. I would be operating at power so I preferred to tune for 1.1:1.
Yes I know the Yagi is not very good with that narrow bandwidth, but it is what 
it is. Normally I operate CW only on 40M & tune it to 7.030 with the bandwidth 
covering the preferred Region 1 CW portion of the band ie7.000 to 7.040 and the 
tuner is not needed.
73 Ray G3XLG


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Re: [Elecraft] KPA1500 in the IARU Contest Last Weekend

[donovanf]

Or water... 


Are you sure your coaxial cable, balun and connectors are all dry? 


From your description, the last thing I'd examine is the KPA1500 


Good luck! 


73 
Frank 
W3LPL 



On Wed, Jul 15, 2020 at 11:19 AM Nr4c  wrote: 

> My first thought is “Heat”! 
> 
> 
> Sent from my iPhone 
> ...nr4c. bill 
> 
> 
> > On Jul 15, 2020, at 4:43 AM, Ray Spreadbury via Elecraft < 
> elecraft@mailman.qth.net> wrote: 
> > 
> > Hi 
> > 
> > I was a member of the UK HQ team for this 24hour IARU event last weekend 
> and 
> > was one of the two Ops on 40M SSB. 
> > 
> > We took it in turns to be the Run station every 4 hours and I was using a 
> > 40M 2-El yagi at 60ft. I noticed that every 30-60mins, I needed to do a 
> > re-tune on the KPA1500 to keep the SWR at or near to 1.1:1, as it seemed 
> to 
> > gradually creep up over time. The amp temp peaked at 70C but was mostly 
> at 
> > about 55C. The SWR never got above 1.5:1 using KPA1500 screen but I know 
> > that the yagi was really presenting about 1.6:1 at the run frequency. 
> When 
> > not operating as the Run station the other Op was in Partner mode 
> spotting 
> > mults & helping with call identification. 
> > 
> > We were using the WinTest logging program as this enables us to private 
> > network with the other UK HQ stations (one on CW & one on SSB for each 
> > contest band ie. a total 12 stations at any one time, plus Partners). 
> > Because of Covid, this year we were all single Ops working from home 
> rather 
> > than just a few multi op stations. 
> > 
> > My K3S & the KPA1500 worked faultlessly for the 24hours as did Wintest 
> but I 
> > wonder what was the cause of the SWR increasing over time & needing a 
> > re-tune? 
> > 
> > 73 Ray G3XLG 
> > 
> > __ 
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Re: [Elecraft] KPA1500 in the IARU Contest Last Weekend

[Jim Miller]

Describe your antenna system.

Jim ab3cv

On Wed, Jul 15, 2020 at 11:19 AM Nr4c  wrote:

> My first thought is “Heat”!
>
>
> Sent from my iPhone
> ...nr4c. bill
>
>
> > On Jul 15, 2020, at 4:43 AM, Ray Spreadbury via Elecraft <
> elecraft@mailman.qth.net> wrote:
> >
> > Hi
> >
> > I was a member of the UK HQ team for this 24hour IARU event last weekend
> and
> > was one of the two Ops on 40M SSB.
> >
> > We took it in turns to be the Run station every 4 hours and I was using a
> > 40M 2-El yagi at 60ft. I noticed that every 30-60mins, I needed to do a
> > re-tune on the KPA1500 to keep the SWR at or near to 1.1:1, as it seemed
> to
> > gradually creep up over time. The amp temp peaked at 70C but was mostly
> at
> > about 55C. The SWR never got above 1.5:1 using KPA1500 screen but I know
> > that the yagi was really presenting about 1.6:1 at the run frequency.
> When
> > not operating as the Run station the other Op was in Partner mode
> spotting
> > mults & helping with call identification.
> >
> > We were using the WinTest logging program as this enables us to private
> > network with the other UK HQ stations (one on CW & one on SSB for each
> > contest band ie. a total 12 stations at any one time, plus Partners).
> > Because of Covid, this year we were all single Ops working from home
> rather
> > than just a few multi op stations.
> >
> > My K3S & the KPA1500 worked faultlessly for the 24hours as did Wintest
> but I
> > wonder what was the cause of the SWR increasing over time & needing a
> > re-tune?
> >
> > 73 Ray G3XLG
> >
> > __
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> > Home: http://mailman.qth.net/mailman/listinfo/elecraft
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> >
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> > Message delivered to n...@widomaker.com
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Re: [Elecraft] KPA1500 in the IARU Contest Last Weekend

[Nr4c]

My first thought is “Heat”!


Sent from my iPhone
...nr4c. bill


> On Jul 15, 2020, at 4:43 AM, Ray Spreadbury via Elecraft 
>  wrote:
> 
> Hi
> 
> I was a member of the UK HQ team for this 24hour IARU event last weekend and
> was one of the two Ops on 40M SSB. 
> 
> We took it in turns to be the Run station every 4 hours and I was using a
> 40M 2-El yagi at 60ft. I noticed that every 30-60mins, I needed to do a
> re-tune on the KPA1500 to keep the SWR at or near to 1.1:1, as it seemed to
> gradually creep up over time. The amp temp peaked at 70C but was mostly at
> about 55C. The SWR never got above 1.5:1 using KPA1500 screen but I know
> that the yagi was really presenting about 1.6:1 at the run frequency. When
> not operating as the Run station the other Op was in Partner mode spotting
> mults & helping with call identification.
> 
> We were using the WinTest logging program as this enables us to private
> network with the other UK HQ stations (one on CW & one on SSB for each
> contest band ie. a total 12 stations at any one time, plus Partners).
> Because of Covid, this year we were all single Ops working from home rather
> than just a few multi op stations.
> 
> My K3S & the KPA1500 worked faultlessly for the 24hours as did Wintest but I
> wonder what was the cause of the SWR increasing over time & needing a
> re-tune?
> 
> 73 Ray G3XLG
> 
> __
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Re: [Elecraft] Calibrating RX on the K144XV

[Michael Walker]

Hi Randy

I used to own the 144XV and yes, it was off frequency with no way to
actually tune the actual transverter.  I actually did add a GPSDO for a
reference that helped.

Next, it drifted all over the place.

So, to answer your question, yes, this is normal.

Mike va3mw


On Wed, Jul 15, 2020 at 10:38 AM Randy Diddel  wrote:

> Hi all,
>
> I have recently installed a K144XV in my K3s.  From the factory, the
> offset value in the lower part of the band is +3.29 however, I tune into
> the Beam Spinner’s net every morning here in the Denver area on 144.200
> however, with the factory recommendation, I have to tune 144.199.75 to hear
> stations clearly.  Tuning the K3s’s VFO to 144.200, I have to change the
> offset to about +3.59 and then everyone sounds good and are ‘on frequency.’
> There are several stations with have 9700’s so I would think they would be
> bang-on.
>
> So, should I set the offset by ear, should I recalibrate, or ???  I do own
> an XG3 so if I knew how to properly calibrate it, I could go that way too.
>
> Any help is appreciated!
>
> 73
>
> K5RHD
>
> /randy
> __
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Re: [Elecraft] KPA-1500, too?

[N4ZR]

Why ?  I may have missed something, but my KPA-1500 seems to display all 
of the same info simultaneously.


73, Pete N4ZR
Check out the Reverse Beacon Network
at , now
spotting RTTY activity worldwide.
For spots, please use your favorite
"retail" DX cluster.

On 7/14/2020 6:17 PM, Hunsdon Cary III wrote:

Perhaps KV5J can come up with an amplifier monitor for the KPA-1500, too?  Hope 
so!
K4TM

Sent from Clovelly Cottage II, home of amateur radio station K4TM and the most 
creative Sue Cary, in the foothills of the beautiful Blue Ridge mountains of 
Virginia.


On Jul 14, 2020, at 2:29 PM, elecraft-requ...@mailman.qth.net wrote:

Send Elecraft mailing list submissions to
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When replying, please edit your Subject line so it is more specific
than "Re: Contents of Elecraft digest..."


Today's Topics:

   1. Very pleased with KV5J Digital Display Unit for theElecraft
  KPA500 (Macy monkeys)
   2. Fwd: Re[2]:  K2 7747 VCO alignment problem (Keith Hamilton)
   3. Re: FT8 - was "On Second Thought, I'll Take The Stairs"
  (Robert Hand)
   4. Re: Fwd: Re[2]: K2 7747 VCO alignment problem (Dave Van Wallaghen)
   5. Re: "On second thought, I'll take the stairs." (Kurt Pawlikowski)
   6. Re: Fwd: Re[2]: K2 7747 VCO alignment problem (Keith Hamilton)
   7. K3 very slow to reach dialed rf output (John)
   8. Re: "On Second Thought, I'll Take The Stairs (Doug Turnbull)
   9. Elecraft K2 CW key shaping (dl2ki)
  10. Re: Elecraft K2 CW key shaping (Victor Rosenthal 4X6GP)
  11. Re: Elecraft K2 CW key shaping (Matt Maguire)
  12. Re: Elecraft K2 CW key shaping #chirp #click (Rich NE1EE)
  13. Re: K3 very slow to reach dialed rf output (David Herring)
  14. Re: [K3] Sub receiver intermittant failures (w4sc)
  15. Re: K3 very slow to reach dialed rf output (John)
  16. Replace backup battery CR2032 in a K3 (Steef PA2A)
  17. Re: Replace backup battery CR2032 in a K3 (Grant Youngman)
  18. Re: "On Second Thought, I'll Take The Stairs (Jim Brown)
  19. Re: "On Second Thought, I'll Take The Stairs (Tony Estep)
  20. Re: Replace backup battery CR2032 in a K3 (Nr4c)


--

Message: 1
Date: Mon, 13 Jul 2020 17:05:31 -0700
From: Macy monkeys 
To: elecraft@mailman.qth.net
Subject: [Elecraft] Very pleased with KV5J Digital Display Unit for
theElecraft KPA500
Message-ID: <484d78aa-7e8e-4c6a-802b-4bc0dc3b5...@charter.net>
Content-Type: text/plain;charset=us-ascii


I just finished hooking up the remote KV5J DDU for my KPA500. It arrived today 
via USPS extremely well packed. Hook up was a snap. The unit does exactly what 
Keith says it does. And it looks terrific! The display is not too bright, not 
too dim. Perfect! It is very professional looking in a stout metal housing. 
Keith was quick to answer my emails.

Very pleased! I have no connection to Keith or his products other than being a 
satisfied customer.

John K7FD



On Jul 13, 2020, at 3:04 PM, Macy monkeys  wrote:

I purchased it exactly for those reasons; my KPA500 is on a shelf under my 
operating desk. The DDU will enable me to see what I can't easily see now. 
Perfect solution.

And yes, my DDU arrived today and I will soon give it a shakedown cruise...

John K7FD


On Jul 13, 2020, at 12:58 PM, Keith Ennis via Elecraft 
 wrote:

Andy,

It's design was not to replace the KPA500 utility if that is what you want
to use.  It was designed to show the 5 most often used readings from the
front panel that can only be seen one at a time.

Plus it does not use any PC resources.  Monitor space is limited to most
operators.  Same with com ports.

Place the KPA500 wherever you want and place the DDU next to your radio.
Saves on heat, noise and desktop space.

Thanks for your input.73

Keith,KV5J

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--

Message: 2
Date: Mon, 13 Jul 2020 21:34:03 -0400
From: Keith Hamilton 
To: 

[Elecraft] KPA500 and VSWR

[Randy Farmer]

I just finished the 1300Z session of the CWops CWT and thought I'd pass 
on an observation on the KPA500. When I'm operating in contest mode, one 
of the things I like to keep an eye on is the KPA500 PA temperature, as 
monitored via WIN4K3. (WIN4K3 manages the multiple connections for CAT 
data needed to run my heavily automated SO2R station.) For the past few 
weeks, my regular strategy has been to run continuously in the early CWT 
sessions, usually on 40 meters. Late last week I made a tweak to my 
80-40 inverted V antenna that resulted in raising it around 15 feet from 
its previous height of around 40 feet. As a result of this change, the 
40 meter VSWR at the transmitter produced by my KAT500 dropped from 
about 1.4:1 indicated to 1.04 indicated on a well-calibrated LPA-100A. 
At the duty cycle of constant run operation at around 34 WPM, the PA 
temperature was previously running in the very high 50s, sometimes 
getting to 60° or even 61°. I'm actually slightly exceeding the amp's 
500W output rating, since I set the drive to produce 500W as measured at 
the output side of my switched bank of Low Band Systems bandpass 
filters. With the lower VSWR, I never saw the PA temperature exceed 50°. 
I suppose this shouldn't come as a surprise, but it does show the PA 
heating effects of even moderate load mismatches on a solid state 
amplifier designed for a 50 Ohm load. Just an anecdote that some may 
find interesting.


73...
Randy, W8FN
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[Elecraft] Calibrating RX on the K144XV

[Randy Diddel]

Hi all,

I have recently installed a K144XV in my K3s.  From the factory, the offset 
value in the lower part of the band is +3.29 however, I tune into the Beam 
Spinner’s net every morning here in the Denver area on 144.200 however, with 
the factory recommendation, I have to tune 144.199.75 to hear stations clearly. 
 Tuning the K3s’s VFO to 144.200, I have to change the offset to about +3.59 
and then everyone sounds good and are ‘on frequency.’ There are several 
stations with have 9700’s so I would think they would be bang-on.

So, should I set the offset by ear, should I recalibrate, or ???  I do own an 
XG3 so if I knew how to properly calibrate it, I could go that way too.

Any help is appreciated!

73

K5RHD

/randy
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[Elecraft] KPA1500 in the IARU Contest Last Weekend

[Ray Spreadbury via Elecraft]

Hi

I was a member of the UK HQ team for this 24hour IARU event last weekend and
was one of the two Ops on 40M SSB. 

We took it in turns to be the Run station every 4 hours and I was using a
40M 2-El yagi at 60ft. I noticed that every 30-60mins, I needed to do a
re-tune on the KPA1500 to keep the SWR at or near to 1.1:1, as it seemed to
gradually creep up over time. The amp temp peaked at 70C but was mostly at
about 55C. The SWR never got above 1.5:1 using KPA1500 screen but I know
that the yagi was really presenting about 1.6:1 at the run frequency. When
not operating as the Run station the other Op was in Partner mode spotting
mults & helping with call identification.

We were using the WinTest logging program as this enables us to private
network with the other UK HQ stations (one on CW & one on SSB for each
contest band ie. a total 12 stations at any one time, plus Partners).
Because of Covid, this year we were all single Ops working from home rather
than just a few multi op stations.

My K3S & the KPA1500 worked faultlessly for the 24hours as did Wintest but I
wonder what was the cause of the SWR increasing over time & needing a
re-tune?

73 Ray G3XLG

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Re: [Elecraft] Elecraft K2 CW key shaping

[dl2ki]

Hi,

thanks for the hints and information.

I will listen to the signal once with my K3. That seems to be the best way
to check the hint. But I will also have a look at the connector plugs and
power supply cables in my portable configuration.

73, Wolfgang
DL2KI




--
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