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Re: [TenTec] Orion AGC setting for QRN

To: tentec@contesting.com
Subject: Re: [TenTec] Orion AGC setting for QRN
From: Sinisa Hristov <shristov@ptt.yu>
Reply-to: tentec@contesting.com
Date: Tue, 25 May 2004 10:23:32 -0400
List-post: <mailto:tentec@contesting.com>
"Marijan Miletic, S56A" wrote:

> QRN is random short but very strong pulse.

As short as ignition pulses?


> Even today my FT-1000MP has two NB settings...

Is any of them actually effective against QRN?


> >> W8JI RX IMD measurements with 10 kHz spacing seems to be USA tailored.
 
> >In what sense?
 
> First IF filters are usually 15 kHz wide and you can squeeze both 10 kHz
> spaced test tones to make life difficult for second mixer.  20 kHz spacing
> is much easier case.  Only Orion and K2 use narrow front end IF filters
> until expensive IC-7800 and FT-9000 showed up.  Their high BDR claims shoud
> be always checked against image and IF rejection which is within operating
> frequency range!


OK, so the 10 kHz spacing is also IC7800 and FT9000 tailored :-)


73,

Sinisa  YT1NT, VA3TTN
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