...@mailman.qth.net] On Behalf Of
Barthold Lichtenbelt via Elecraft
Sent: Wednesday, November 16, 2016 1:25 PM
To: 'iain macdonnell - N6ML'; 'Jack Brindle'
Cc: 'Elecraft Reflector'
Subject: Re: [Elecraft] KPA500 power output starts out low, then goes up
> I didn't see
I had the KPA500 PIN diode problem in 2015, and it started on one band
only. And it did not happen all the time. After a while it became worse
and more bands were affected.
So based on my experience with my KPA500 #1497, I suggested the PIN
diode problem as a possiblity.
I wonder what the seri
suggests input side is OK?
Barthold
AD0RM
-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of iain
macdonnell - N6ML
Sent: Wednesday, November 16, 2016 11:12 AM
To: Jack Brindle
Cc: Elecraft Reflector
Subject: Re: [Elecraft] KPA500 power output starts
I didn't see anything in this thread that suggested that the problem
wasn't observed on all bands. Maybe I missed it?
Also haven't noticed anyone suggest using the K3's "TUNE" function,
instead of SSB modulation, as a test. If the output ramps up with the
TUNE function, it's an output problem. If
A TR switch failure would affect all bands. This one is a bit different. It
will be interesting to see the cause when we finish troubleshooting.
Jack Brindle, W6FB
Elecraft Engineering
Sent from my iPhone
> On Nov 16, 2016, at 12:04 PM, Arie Kleingeld PA3A wrote:
>
> This might be a problem w
This might be a problem with the pin diode T/R switching in the KPA500.
73,
Arie
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Several things I would suggest:
1) Turn off external ALC in the K3. We recommend NOT using it with the KPA500
(or any other amp for that matter).
2) Run the test with the K3 connected to a power meter then a dummy load to see
if the problem persists. If so,
you probably need to recalibrate the
ecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of ab2tc
Sent: Monday, November 14, 2016 6:22 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] KPA500 power output starts out low, then goes up
Hi,
How about following Vic, 4X6GP's advice and test the K3 without the KPA500 in
circ
just did that. no help.
…bill
> On Nov 14, 2016, at 8:22 PM, ab2tc wrote:
>
> Hi,
>
> How about following Vic, 4X6GP's advice and test the K3 without the KPA500
> in circuit? Your symptoms are exactly as if the K3 TX calibration is badly
> out of wack as he suggests. The fact that a band chang
Hi,
How about following Vic, 4X6GP's advice and test the K3 without the KPA500
in circuit? Your symptoms are exactly as if the K3 TX calibration is badly
out of wack as he suggests. The fact that a band change makes it worse is a
dead give-away. A band change makes the K3's ALC algorithm reset its
That hasn’t helped my KPA500. I notice it particularly after a band change.
…bill nr4c
> On Nov 13, 2016, at 10:58 PM, Vic Rosenthal 4X6GP wrote:
>
> Hi Barthold,
>
> Maybe the K3S output is ramping up slowly. Do you notice this with the KPA500
> off? Running the TX Gain Calibration in the
Does the SWR also change?
Sounds like something is happening with your
antenna. Do you have a dummy load that will
handle the power? Good test would be to see
what it does into a known 50 ohm load.
Jim W, W4RKS
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Hi Barthold,
Maybe the K3S output is ramping up slowly. Do you notice this with the
KPA500 off? Running the TX Gain Calibration in the K3 Utility might help
in that case.
73,
Vic, 4X6GP
Rehovot, Israel
Formerly K2VCO
http://www.qsl.net/k2vco/
On 14 Nov 2016 00:51, Barthold Lichtenbelt via El
Hi All,
Maybe you can help with something that is baffling me. My KPA500 doesn't go
to full output until I have spoken my callsign (when trying to get through a
pileup) a few times. It starts off with 100 or so watts, and after a few
iterations rises to the full 500W output. I see this both on
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