Is there any phase noise in an analog LC PTO? I believe the only digital
circuit in the Corsair II is the frequency counter.
When I've had my Corsair II running with either a Paragon or a Omni VI+ as
its AUX RX, the Corsair II was always quieter. Weak signal detection is
about the same or too small a difference to hear. Only in close in (2 KHz)
weak DX, strong station (multiple S9+ signals) CW pileups does the OMNI VI+
prevail.
73,
Gary - AB9M
--------------------------------------------------
From: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Sent: Sunday, April 25, 2010 5:47 PM
To: <tentec@contesting.com>
Subject: Re: [TenTec] OMNI VII vs. K3 ? Opinions invited.,
> Probably because there are differences in the RF and first IF circuits.
> Those in the Corsair II use multiple transformer coupled feed back
> (Ulrich Rohde's favorite circuit though patented by Anzac) and in the
> Omni V uses Jfets in grounded gate in parallel. The dynamic range of the
> transformer feedback circuit may be a bit better, quieter and harder to
> overload. And while the synthesizer in the Omni V is fairly quiet, it
> may not have as low phase noise as the PTO in the Corsair II which means
> less reciprocal mixing of unwanted signals and noise. I don't know that
> either has been tested for phase noise as much as more recent radios.
>
> 73, Jerry, K0CQ
>
> On 4/25/2010 2:12 PM, Steve Berg wrote:
>> I have been enjoying this thread quite a bit. One question that I have
>> about receiver performance may bear a bit on what has been discussed so
>> far. Since upgrading to extra several years ago, I have been having a
>> lot of fun on the low end of 80 and 40 meters, working DX on CW. I have
>> two Ten Tec rigs, a Corsair II and an Omni V.9. Both have the 500 Hz
>> and 250 Hz filters in the IF string, and the Omni also has a 250 Hz
>> filter in the first IF. What I have noticed is that the Corsair II is
>> seemingly able to pull out really weak signals more clearly than does
>> the Omni. I am reasonably familiar with both radios, and also have a
>> pair of ears that have given their all to heavy weapons and artillery
>> many years ago, and been further damaged by loud motorcycles, since
>> then. Why might I seem to notice a difference in clarity from otherwise
>> somewhat similar radios?
>>
>> Steve WA9JML
>>
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