[Elecraft] KPA-1500 power supply fan noise

[Charlie T]

Well, THAT's good to hear......
The PW-1 MUST be "ON" before ANY signals get to the radio.
Admittedly, this all happens automatically with the newer versions as soon as you punch the radio's power button, but it's great to hear even THAT won't be necessary with the KPA-1500 to simply "check-the-band".

73, Charlie k3aICH
'



-----Original Message-----
From: elecraft-bounces at mailman.qth.net <elecraft-bounces at mailman.qth.net> On Behalf Of Eric Swartz WA6HHQ - Elecraft
Sent: Saturday, May 23, 2020 11:53 AM
To: Larry (K8UT) <K8UT at charter.net>
Cc: elecraft at mailman.qth.net
Subject: Re: [Elecraft] KPA-1500 power supply fan noise

Hi Peter,

If the amp is on, there needs to be at least some PS fan activity at a low speed to cool the PS in idle. 

What s/n is your 1500? On later s/ns we changed a resistor in the ps fan circuit to slow them down a bit more. 

An alternative is to swap your ant 1 and 2 connections, putting the 6m ant on ANT 1. Then you can listen to 6m with the amp off. 

73,
Eric
elecraft.com
---
Sent from my iPhone 6S

> On May 23, 2020, at 8:10 AM, Larry (K8UT) <K8UT at charter.net> wrote:
> 
> Peter
> 
> I built a slightly longer cable to match the length of the control cable that came with the amplifier (about 3 feet longer if I recall correctly).
> 
> This allows the PS to operate "remote" in a closet with the door closed.
> 
> -larry (K8UT)
> 
> ------ Original Message ------
> From: "Peter Dougherty" <lists at w2irt.net>
> To: Elecraft at mailman.qth.net
> Sent: 2020-05-23 10:33:19 AM
> Subject: [Elecraft] KPA-1500 power supply fan noise
> 
>> Is there any way to power off the fans (or lower their RPM) on the 
>> PSU if the amp is in standby mode?
>> 
>> I would like to keep my rig on 6m throughout the day during the Es season.
>> The problem is my 6m antenna is on antenna port 2 on the KPA, which 
>> requires the amp to be powered up. I only need to TX when a new grid 
>> pops up, but I do like to monitor the band during the day while I'm 
>> working. My XYL is working from home, and is in the same room for 
>> about 9 or 10 hours a day, and the noise after 10 minutes was too much for her. Any suggestions?
>> 
>> Please-n-thanks.
>> 
>> ---------------------------------------------
>> 73 and Good DX
>> Peter, W2IRT
>> 
>> 
>> 
>> President, North Jersey DX Association
>> 
>> DXCC Card Checker
>> Letter O Manager, ARRL Incoming 2nd District QSL bureau
>> 
>> 
>> 
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