[MRCG] Poor conditions in Eureka

[Richard Knoppow]

----- Original Message ----- 
From: "Mark J. Blair" <nf6x at nf6x.net>
To: "West Coast Military Radio Collectors Group" 
<mrcg at mailman.qth.net>
Sent: Monday, September 08, 2014 1:13 AM
Subject: Re: [MRCG] Poor conditions in Eureka


>
> On Sep 7, 2014, at 22:40 , Jim Falls <radio-tuber at att.net> 
> wrote:
>> Excellent! I always run my RTTY so the ALC is just barely 
>> twitching. I'd like to run some tx power tests next time. 
>> I was running 70w tonight. Interested in seeing how far 
>> down I can get.
>
> I originally had it set just below where the ALC twitched, 
> which gave me nearly 100W. Folks reported audio spurs, 
> though. They were still present but not too bad at 80W. I 
> turned it down to 50W, and they were gone.
>
> I didn't hear or see substantial spurs or distortion in 
> your signal, so I wonder why I need to turn my signal 
> level down a lot lower for clean Tx audio?
>
> -- 
> Mark J. Blair, NF6X <nf6x at nf6x.net>
> http://www.nf6x.net/
>
     Have you any way of monitoring your own transmissions? 
You could try using an external general coverage receiver 
and dummy load for the TX.  Of course a spectrum analyser 
would be ideal but isn't really necessary.  Spurs can come 
from a lot of places. A two tone test might tell you if you 
have distortion. Again, a receiver with a sharp filter, like 
an old type crystal filter, could probably separate the 
intermodulation products.


--
Richard Knoppow
Los Angeles
WB6KBL
dickburk at ix.netcom.com