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[TenTec] Followup on Omni VI Plus birdies

To: <tentec@contesting.com>
Subject: [TenTec] Followup on Omni VI Plus birdies
From: sales@tentec.com (Ten-Tec, Inc.)
Date: Wed, 26 Nov 1997 10:24:34 Eastern Standard Time
At 12:05 AM 11/25/97 -0600, AC5AA wrote:
>My results below.  .. . 

We have this discussion on the reflector every few months or so, 
but for the "file" I wanted to interject some of the same comments
made previously about the Omni-VI and Omni-VI Plus and the spurious
emission issue.

There are a number of unfilterable in-band spurious emissions that 
are produced as a result of the Omni's crystal mixing scheme.  As you
can see from a couple of recent posts, each radio is unique.  Part of
the engineering trade-off for the enhanced phase noise and overall
receiver performance of the Omni series is that there are some spurs 
present, particularly noticeable on the 28 MHz band. 

The majority of these spurs are not present when a live antenna is
connected to the transceiver.  There was a long post to the reflector
(that should be readable via the archive) by K5KVH regarding spurs,
dummy loads, no loads, and antenna loads that is worth a re-read for 

We have always been careful to point out, when asked, that these spurs 
do exist.  The vastly improved overall receiver performance, in our 
view, is more than worth the trade-off involved. 

Scott Robbins, W4PA
Amateur Radio Product Manager, Ten-Tec 

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