[Elecraft] low power on 6 meters

[WILLIS COOKE]

The input circuit is bypassed by the relay so the only thing in the path is the 
relay, coax connectors and the wires.  I think it is the wires.  I have no such 
difficulty on 10 meters.  My amp is the Dentron Clipperton L with the AD5X QSK 
mod.  The connecting wires are about 2.5 inches long.  The QSK mod works great 
on low bands when the amp is on.  The relay noise is less than the fan noise and 
it has survived several thousand QSOs with no problem other than 6 meters.  The 
Dentron is the predecessor to the AL572 with the same tube lineup and a bit more 
compact layout. 
 Willis 'Cookie' Cooke 
K5EWJ & Trustee N5BPS, USS Cavalla, USS Stewart 




________________________________
From: K4ia <k4ia at aol.com>
To: WILLIS COOKE <wrcooke at yahoo.com>
Cc: Elecraft Reflector <elecraft at mailman.qth.net>
Sent: Sun, July 17, 2011 10:35:19 AM
Subject: Re: [Elecraft] low power on 6 meters

I notice high swr when my AL572 is in the antenna circuit - even when turned 
off.  When I hook the coax directly to the K3, the swr is 1:1. Haven't figured 
out why except maybe there is a low pass filter built in the amp that is in line 
all the time.  


Craig Buck

On Jul 17, 2011, at 11:07 AM, WILLIS COOKE <wrcooke at yahoo.com> wrote:

> Bob, do you have an amplifier in line on 6 meters?  I have noticed that my 
> Clipperton L absorbs about 15 watts on 6 meters even when it it turned off.  It 
>
> does not do this on the lower bands.  You can easily find out by taking the 
> connectors loose on the amp and replacing with a short barrel connector.  May 
> not be your problem, but it is mine.
>  Willis 'Cookie' Cooke 
> K5EWJ & Trustee N5BPS, USS Cavalla, USS Stewart 
> 
> 
> 
> 
> ________________________________
> From: Robert Garceau <rgarceau at snet.net>
> To: Elecraft <elecraft at mailman.qth.net>
> Sent: Sun, July 17, 2011 6:11:59 AM
> Subject: [Elecraft] low power on 6 meters
> 
> I have seen this issue posted before, but no answers that I can see.
> 
> 
> 
> I have a K3 and the output is no more than 52 watts with an swr of
> 1.23..sometime get it up to 62.
> 
> 
> 
> Now I have the KPA500 and using 40 watts to exite the amp, I get just a tad
> over 425 watts.
> 
> 
> 
> Don't think I want to push it over 40 watts. And to be honest there probably
> isn't much difference between 425 and 500, but would like to know why I
> can't get the 100 like I should..
> 
> 
> 
> Bob, W1EQ
> 
> 
> 
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