Re: [Elecraft] Fw: KPA500 Power out query.

[AJ8MH-Radio.Joe.Hutchens]

Call tech support. A new Z bracket may or may not fix the issue. I 
decided to live with it.



Joe
( www.aj8mh.com )

On 1/29/2018 7:47 AM, j...@kk9a.com wrote:

Is there a fix for the KPA500 pinging? I do not use my amp often but I
have seen this occur on occasion. I am hoping that the KPA1500 does not do
this.

John KK9A

AJ8MH wrote:
Sun Jan 28 12:30:32 EST 2018

Also, heat causes some stress on the chassis and you'll here pings as it
flexes with temp.  The first time I heard that, it scared the heck out
of me.  I believe there is a fix for that, too.

Joe
( www.aj8mh.com )


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[Elecraft] Fw: KPA500 Power out query.

[j...@kk9a.com]

Is there a fix for the KPA500 pinging? I do not use my amp often but I
have seen this occur on occasion. I am hoping that the KPA1500 does not do
this.

John KK9A

AJ8MH wrote:
Sun Jan 28 12:30:32 EST 2018

Also, heat causes some stress on the chassis and you'll here pings as it
flexes with temp.  The first time I heard that, it scared the heck out
of me.  I believe there is a fix for that, too.

Joe
( www.aj8mh.com )


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Re: [Elecraft] Fw: KPA500 Power out query.

[AJ8MH-Radio.Joe.Hutchens]

My amp is close to 7 years old and 20 has always required more drive.  
27 to 30 watts on all bands except 20 where I'll run it up to 35 in a 
pinch. Elecraft suggested I send it in, but I haven't let the smoke out, 
yet.  Unlike your issue, I see a change when I increase drive. I drive 
the amp with either a Yaesu FT-950 or a FTDX3K.  ALC is not wired.  
There is a modification kit out for the amp, but have no idea what it 
addresses.


Also, heat causes some stress on the chassis and you'll here pings as it 
flexes with temp.  The first time I heard that, it scared the heck out 
of me.  I believe there is a fix for that, too.


Joe
( www.aj8mh.com )

On 1/28/2018 10:57 AM, Mike Streeter via Elecraft wrote:

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[Elecraft] Fw: KPA500 Power out query.

[Mike Streeter via Elecraft]

 

   - Forwarded Message - From: Mike Streeter To: 
elecraft...@yahoogroups.com Sent: ‎Saturday‎, 
‎January‎ ‎27‎, ‎2018‎ ‎12‎:‎04‎:‎40‎ ‎PM‎ ‎CSTSubject: KPA500 Power out query.
 I am driving my KPA500 with my K3 to a Mosley PRO 67. On every band except 20 
meters 25 watts out from the K3 will give me at least 500 watts out of the 
amplifier. On 20 meters I get 450 watts out with 25 watts drive but no increase 
even if I go to 40 watts out from the  K3. I have put a dummy load on the K3 
using the usual RG 213 and the SWR is 1:1, and I have checked the antenna with 
an MFJ 259, using the usual RG 213 cable and it is 1:1 at 14.000 up to 1.4:1 at 
14.350.I have loaded the latest firmware to both the K3 and the KPA. I realize 
that the difference between 450 and 500 watts is negligible but it bugs me that 
it is not giving me full power out on 20.Anyone have any ideas as to how to fix 
it?Many thanks, Mike, WM5DX.
  
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