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From: "Keith" <ac7xc at earthlink.net>
To: "John FRANCIS" <g3lwi at johnros91.freeserve.co.uk>,
        <elecraft at mailman.qth.net>
Date: Sat, 26 Apr 2003 12:49:07 -0700
Subject: Re: [Elecraft] Erratic RF Output



On 26 Apr 2003 at 20:16, John FRANCIS wrote:

> Sent on behalf of Tom Hamilton G0HIN  K2 #3912.
> 
> Ater some initial problems, which were all sorted out by Gary, I have
> today had another problem.  Whilst in QSO with a Polish Station, my RF
> output started jumping all over the place becoming very erratic.  Started
> of at 15 Watts ending up at less than 1 watt. Wonder if anyone else has
> had this problem.  Any help much appreciated.

 Run the output into a dummy load and see if the problem is 
duplicated, if not then it could be a short in the coax/feedline or 
antenna system. I had a problem years ago with water corriding a 
dipole feedline connection. 



Best Regards, Keith  
----------------------------------------
NW Oregon Radio Page http://home.earthlink.net/~kilowattradio/


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From: "Bruce D. McLaughlin" <bmclaugh at buckeye-express.com>
To: "'John FRANCIS'" <g3lwi at johnros91.freeserve.co.uk>,
        <elecraft at mailman.qth.net>
Subject: RE: [Elecraft] Erratic RF Output
Date: Sun, 27 Apr 2003 14:55:38 -0400

In addition to the other suggestion about running it into a dummy load,
you might want to look at the swr when the power drops if you have a swr
bridge appropriate for that power level.  I concur that it sounds very
much like antenna or feed line problems.  It could also be an
intermittent antenna or feedline connection.  Both of those conditions
(and others) would cause a high swr and final power foldback.
Monitoring the swr when that happens could indicate such a problem.  If
the rig does not act up while operating into a dummy load, I guess it
might confirm that the problem is not in the rig, but the SWR monitoring
would likely confirm something happening with the feedline/antenna
system.
By the way, when the power has dropped, do the receive signals also
drop?  If they do, I think that would likely be additional evidence of a
possible line/antenna problem.

Bruce - W8FU

-----Original Message-----
From: elecraft-admin at mailman.qth.net
[mailto:elecraft-admin at mailman.qth.net] On Behalf Of John FRANCIS
Sent: Saturday, April 26, 2003 3:17 PM
To: elecraft at mailman.qth.net
Subject: [Elecraft] Erratic RF Output

Sent on behalf of Tom Hamilton G0HIN  K2 #3912.

Ater some initial problems, which were all sorted out by Gary, I have
today had another problem.  Whilst in QSO with a Polish Station, my RF
output started jumping all over the place becoming very erratic.
Started of at 15 Watts ending up at less than 1 watt.
Wonder if anyone else has had this problem.  Any help much appreciated.

73's  Tom  G0HIN

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