My Omni-C puts out big-time spurs on 17 Meters. I fear Ten-Tec's assurances
that the Omni-C is OK on that band may be wishful thinking in many or most
cases. I'm the guy who reported spurious output on the order of two watts
KEY UP on the 17 Meter band with my Omni-C. You can look back in the
archives in 2003 and find a big discussion (if you haven't done that).
73, Mike N4NT
----- Original Message -----
From: "Dr. Gerald N. Johnson" <firstname.lastname@example.org>
Sent: Friday, January 28, 2011 5:08 PM
Subject: Re: [TenTec] WARC band crystal part numbers
> Yes the 17 meter spur was fixed at some point. Yhe way know its fixed is
> when you have to go to the inverted side band to ge USB on 17m. Because
> the fix is to mix the 5 MHz PTO with 22 MHz to make a 27 MHz TX mixer
> injection LO rather than mixing the 5 MHz PTO with 4 to make a 9 MHz LO
> injection which has the harmonic problem. There might be a little bit
> from the SSB signal but its typically 10 or 20 dB weaker than the LO
> going into the mixer and so less of a harmonic generator. So the 17
> meter crystal will be 22 or 11 MHz instead of 4 for the old scheme.
> I haven't bought from ICM lately but $25 from Tentec sounds like a
> decent buy with no questions on what the specs are.
> 73, Jerry, K0CQ
> On 1/28/2011 2:20 PM, Bill Acito W1PA wrote:
>> Thanks, Jerry.
>> Despite reports that these were no longer available, I spoke with Paul
>> at the factory, and he indeed had these (12 and 17M) for the 580 Delta
>> I nudged him about the 17m issue, and he said the Delta and the OMNI-C
>> not have this issue, only the Omni-A/B.
>> Is that correct? (haven't had a chance to search the archive yet, but I
>> something about "putting out a watt or two, even on receive")
>> Bill W1PA
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