[Elecraft] KXPA100 SSB Distortion

[Don Wilhelm]

Ray,

Do you have a dummy load and another receiver?  Borrow the receiver if 
necessary.

You can't tell much by the KX3 monitor.
Connect the dummy load to the ANT jack and connect a short wire to the 
other receiver.  Place that wire far enough away from the dummy load to 
obtain about an S-9 signal.  Listen with headphones.

Transmit at several power levels.  How does the signal sound at each.
If it sounds OK on the dummy load, then look for RF in the shack to be 
the problem.
OTOH, if it sounds distorted into the dummy load, contact elecraft 
support - support at elecrat.com

73,
Don W3FPR

On 4/23/2018 12:14 PM, Ray W2RS via Elecraft wrote:
> Hi Kurt,
> 
> 
> It's hard to tell because the monitor plays the KX3 audio, which is good.
> 
> 
> Tnx, Ray
> 
> 
> 
> 
> -----Original Message-----
> From: Kurt Cramer <vwracer23 at gmail.com>
> To: rsoifer1 <rsoifer1 at aol.com>
> Cc: elecraft <elecraft at mailman.qth.net>
> Sent: Mon, Apr 23, 2018 8:58 am
> Subject: Re: [Elecraft] KXPA100 SSB Distortion
> 
> Does it work correctly into a dummy load. It sounds like RF in the audio,
> 
> 73 Kurt W7QHD
>> On Apr 23, 2018, at 8:32 AM, Ray W2RS via Elecraft <elecraft at mailman.qth.net> wrote:
>>
>>
>> My KXPA100 transmits distorted audio on SSB, but works normally on CW and RTTY.  With 100 watts output, drain current is 11.7 A and supply voltage is 13.1 V, down from 13.7 V on receive.  My power supply is a pre-MFJ Astron RS-35A.
>>
>>
>> The KX3 with which I drive it operates normally on all bands and modes, with good transmit audio.  Speech compression is off and mic gain is set to 20.
>>
>>
>> Should I send the amp back to Elecraft for service, or is there another problem?
>>
>>
>> 73 Ray W2RS
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