[TenTec] Corsair II PTO Problems

[Kevin Purcell]

See my post on the difference between the two.

IMHO (and I think most of the nets HO too) the Omni V

Better phase noise.

Better crystal filtering close to the fist mixer (the advantage of a  
low IF compared to a high IF).

E.g. the OMNI's (including the B, V, VI, VI+ and VII) are in the  
Sherwood Engineering table but the Paragons aren't. That may be just  
that the sort of folks that make the measurements don't use Paragons.

<http://www.sherweng.com/table.html>

Though that said the measurements in the ARRL review show the Paragon  
is no slouch either:

3OIP is +18dBm; SFDR 101dB at 20kHz; BDR 136dB at 20kHz.

For the Omni V these are

3OIP is +7dBm; SFDR 97dB at 20kHz; BDR 136dB at 20kHz.

The Paragon wins on the numbers but I suspect the Omni V is better on  
the air especially for weak-signal work in a close-in strong-signal  
environment (DX chasing and contensts). I suspect for closer in  
numbers the Omni would look better as the Paragon wilts once the  
interfering signal comes inside the roofing filter.

For those who have compared their circuits are there any significant  
differences? Or do they share common designs. I suspect they must be  
similar but not identical.

I've noticed TT will share design ideas but not identical components  
(e.g. Jupiter and the RX-320 are very similar but the diode ring  
mixers are schottky in the Jupiter and switching PN in the RX-320).

73 Kevin

On Nov 29, 2007, at 5:00 AM, hamradio at twcny.rr.com wrote:

> Thanks for the info, what was a better rig, the Paragon or the Omni V?

--
73 DE N7WIM / G8UDP
Kevin Purcell
kevinpurcell at pobox.com