Re: [Elecraft] KPA500 power output starts out low, then goes up

...@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 anything in this thread that sugges

Re: [Elecraft] KPA500 power output starts out low, then goes up

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

Re: [Elecraft] KPA500 power output starts out low, then goes up

0RM -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 out low, then goes up I didn't see anyt

Re: [Elecraft] KPA500 power output starts out low, then goes up

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

Re: [Elecraft] KPA500 power output starts out low, then goes up

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

Re: [Elecraft] KPA500 power output starts out low, then goes up

This might be a problem with the pin diode T/R switching in the KPA500. 73, Arie __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post:

Re: [Elecraft] KPA500 power output starts out low, then goes up

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

Re: [Elecraft] KPA500 power output starts out low, then goes up

ilto: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 circuit? Your sy

Re: [Elecraft] KPA500 power output starts out low, then goes up

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

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 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

Re: [Elecraft] KPA500 power output starts out low, then goes up

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

[Elecraft] KPA500 power output starts out low, then goes up

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 __ Elecraft mailing list

Re: [Elecraft] KPA500 power output starts out low, then goes up

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

[Elecraft] KPA500 power output starts out low, then goes up

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

[Elecraft] KPA500 Power Output

Sorry if this has been covered before, but I can't recall that it has. Is there any reason why power output falls off over time? Here's what I did: using MMTTY, I diddled into a 50-Ohm dummy load for one minute. I initially had a power output of 525 Watts which went to 500 W shortly and went

Re: [Elecraft] KPA500 Power Output

Are you sure it is the KPA500 that is causing the drop off? There are a lot of variables here. The exciter could be scaling back, the power source (110/220) could be limiting you or something else may be happening. As power cords heat, they tend to restrict the electron flow. Especially if

Re: [Elecraft] KPA500 Power Output

] On Behalf Of Jack Brindle Sent: Friday, January 27, 2012 9:55 AM To: n...@aol.com Cc: elecraft@mailman.qth.net Subject: Re: [Elecraft] KPA500 Power Output Are you sure it is the KPA500 that is causing the drop off? There are a lot of variables here. The exciter could be scaling back, the power

Re: [Elecraft] KPA500 Power Output

Bert, In addition to the other suggestions you received, I'd suggest that you make sure your dummy load is capable of this kind of key-down power for that amount of time. I have an MFJ Dummy Load that is called a 1.5KW Dummy Load but the chart on the back panel shows it is only capable

Re: [Elecraft] KPA500 Power Output

Of course! It's rated in MFJ WATTS. One regular watt = about 10 MFJ watts. Elecraft is one of the few companies making products rated in real watts. On 1/27/2012 10:21 AM, Bill Gerth wrote: Bert, In addition to the other suggestions you received, I'd suggest that you make sure your dummy

Re: [Elecraft] KPA500 Power Output

...@mailman.qth.net] On Behalf Of Vic K2VCO Sent: Friday, January 27, 2012 10:43 AM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] KPA500 Power Output Of course! It's rated in MFJ WATTS. One regular watt = about 10 MFJ watts. Elecraft is one of the few companies making products rated in real

Re: [Elecraft] KPA500 Power Output

de Bob, K6XX -Original Message- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Ron D'Eau Claire Sent: Friday, January 27, 2012 10:18 AM To: n...@aol.com Cc: elecraft@mailman.qth.net Subject: Re: [Elecraft] KPA500 Power Output