[Elecraft] KPA1500 and noise

[Peter Hall]

Folks,

This was the thread I half recalled: excess noise on 10 m.  See reply from Eric re S0239 washers.  May not be applicable to present case (not sure which bands are involved) but worth a check.

http://elecraft.365791.n2.nabble.com/KPA1500-RFI-on-10-Meters-td7657067.html#a7657213

73, Peter.


-----Original Message-----
From: Dave <rocketnj at gmail.com> 
Sent: Saturday, 9 May 2020 10:43 AM
To: Peter Hall <P.Hall at curtin.edu.au>
Cc: w5sum at comcast.net; Elecraft at mailman.qth.net
Subject: Re: [Elecraft] KPA1500 and noise

Mine had noise on 80 meters. Elecraft sent me a load resistor to install in the power supply across the 50 VDC terminals. Knocked the birdies down to the noise floor. I also foo d there is a connection from the minus terminal to the chassis that was loose. 

Serial number 423 and it has been working fine since. 

Dave wo2x

Sent from my waxed string and tin cans. 

> On May 8, 2020, at 10:33 PM, Peter Hall <P.Hall at curtin.edu.au> wrote:
> 
> I don't recall the details but have you read the posts by the Elecraft guys some weeks ago related to excess noise and loose grounding nuts (on or near the SO239 connectors if I recall correctly)?
> 
> My KPA1500 creates a tiny amount of additional noise on 6 m when switched to "operate" but nothing discernible elsewhere.
> 
> 73, Peter.
> 
> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net 
> <elecraft-bounces at mailman.qth.net> On Behalf Of w5sum at comcast.net
> Sent: Saturday, 9 May 2020 8:41 AM
> To: rocketnj at gmail.com; Elecraft at mailman.qth.net
> Subject: Re: [Elecraft] KPA1500 and noise
> 
> only one antenna hooked to it, and that’s a sommer XP808 log fed yagi.  No switches.!
> 
> Ronnie W5SUM
> 
> -----Original Message-----
> From: rocketnj at gmail.com
> Sent: Friday, May 08, 2020 7:35 PM
> To: w5sum at comcast.net ; Elecraft at mailman.qth.net
> Subject: RE: [Elecraft] KPA1500 and noise
> 
> Need more details on what your antenna system is and especially what is connected to antenna 1 and 2 on the amp.
> Any antenna switches, etc.
> 
> Dave wo2x
> 
> 
> 
> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net 
> <elecraft-bounces at mailman.qth.net> On Behalf Of w5sum at comcast.net
> Sent: Friday, May 8, 2020 8:28 PM
> To: Elecraft at mailman.qth.net
> Subject: [Elecraft] KPA1500 and noise
> 
> Recently I have noticed that I have a very high noise lever at my QTH, 
> which I have never had.  Today as I was shutting down my station I 
> turned off the
> KPA1500 first, and my noise dropped from S7 to S1 instantly.
> 
> I turned the Amp back on and the noise came back.  Have any of you ever observed this?
> 
> Thanks in advance
> 
> Ronnie W5SUM
> 
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