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Re: [TenTec] Omni VI and RTTY

To: kf8zn@yahoo.com, Discussion of Ten-Tec Equipment <tentec@contesting.com>
Subject: Re: [TenTec] Omni VI and RTTY
From: Ken Brown <ken.d.brown@hawaiiantel.net>
Reply-to: ken.d.brown@hawaiiantel.net, Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Sat, 12 Jul 2008 11:22:33 -1000
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>

> My Omni VI has the RTTY filter installed. Is it "normal" to have to adjust 
> the PBT control to approx 2:30 to properly receive rtty?
When an Omni VI has the VCXO adjustments, C24 and R18, on the 6.3 MHz IF 
/ PASS BAND TUNING BOARD adjusted properly, the PBT adjustment range is 
4 kHz total, or +/- 2 kHz. In CW, LSB or FSK modes (all of these use the 
same receive BFO frequency)  IF signals which produce audio outputs 
centered around 800 or 1000 Hz will be passed when the PBT knob is 
centered (12 o'clock). The PBT knob needs to go counterclockwise (or 
anticlockwise if you're in the UK) for for lower tones and clockwise for 
higher tones. With a FSK filter in the 9 MHz IF, the signals that pass 
through that filter produce higher audio tones, and when using a narrow 
filter in the 6.3 MHz IF, it is necessary to turn the PBT knob clockwise 
from center in order to get the 6.3 MHz IF passband coincident with the 
9 MHz IF passband.

The short answer to your question is: Yes.


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