I have read all the replies to this post so far and I am still confused. Are we
talking about 10 Hz or 100 Hz?
The readout on my Corsair and any of the other Ten-Tec rigs of the same vintage
doesn't have resolution to 10 Hz.
The last digit on the readout on these rigs is in 100 Hz increments. Granted, I
have never used PSK-31 other than to
listen (watch?), so maybe your MixW thing has some high definition frequency
display capability, I don't know.
All the Ten-Tec rigs I have owned have been the PTO controlled variety, and if
any of them had better than plus or
minus 100 Hz stability I would have been amazed. I would question if any
synthesized rig would be able to accurately
display frequency to that level. Seems you would need some sort of commercial
frequency counter to get that close.
This was my concern about the other post that was asking about using his 544 to
drive the 2 meter transverter because
his synthesized rig was too drifty on CW; the 544 will be more likely to
compound his problem, from my experience.
If I am way off base on this, I will go crawl back in my hole.
cul. 73 de Ed/w4wvw
----- Original Message -----
From: Bob Towers<mailto:mm3kdz@beeb.net>
To: tentec@contesting.com<mailto:tentec@contesting.com>
Sent: Tuesday, March 30, 2004 5:40 AM
Subject: [TenTec] Corsair II warble
I installed the PTO rebuild kit some weeks ago and it has
substantially cured the warble. However there are still minor instabilities
(ie frequency wandering) on some of the bands. The frequency jumping has
been cured, by the way.
I use PSK31 most of the time and I can see the stability of the PTO on the
waterfall display of MixW. In summary it's like this:
28Mhz I don't use, licence conditions prohibit!
24.920 some wandering, about +/- 10Hz
21.070 rock steady
18.100 some wandering, about +/- 10Hz
14.070 some wandering, about +/- 15Hz
10.142 rock steady
7.035 some wandering, about +/- 10Hz
3.580 some wandering, about +/- 10Hz
The worst offender is 14.070, to the point where some operators at the
other end of the QSOs comment on the instability. It also makes tuning of
MFSK signal rather difficult.
The odd thing is the fact that two of the bands are not affected. If I
switch from 21.040 to 14.070 - without touching the tuning knob - the
instability appears, which makes me wonder whether the PTO mechanism is the
culprit.
I would appreciate any comments you might have.
Many thanks,
Bob Towers
MM3KDZ
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