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TS940.6
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1991-03-10
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TS940.6
USE OF TS940S FSK RECEIVE FOR HF PACKET
TS940S owners may wish to use FSK mode for HF packet. FSK cannot be used for
Packet transmit because the shift is 170Hz, and Packet requires 200Hz shift.
This necessitates using LSB with AFSK. I'm not aware of any way to adjust the
shift, and 170Hz is required for FSK on AMTOR and RTTY. It would still be nice
to use FSK for receive, the primary advantage being the availability of CW
filters which are inaccessible in LSB mode. By using the SPLIT capability you
can use LSB for transmit and FSK for receive. Tune in signals with VFO-A on
LSB. Then press A=B, switch to VFO-B, enable FSK, enable RIT and tune the
offset to exactly -2.3KHz. Then enable SPLIT. When listening to signals,
depression of T-F-SET will allow you to listen alternately with each VFO; the
signal tones should be identical. If they are not, adjust the RIT on VFO-B
(FSK mode) until they are. Optional CW filters are switched in by selecting
the NAR ("narrow") filters with the NAR/WIDE switch (LED indicates NAR).
I have found that this arrangement works quite well, and enhances the
readability of received packets, especially under heavy QRM and fading. It is
easier to adjust the CW filters (NAR/WIDE and VBT in WIDE mode) than the SSB
Slope Tune controls.
I would like to hear from other TS940S users who have tried this technique or
others that enhance HF Packet operation. Send replies to WA1FMM @ W8AKF.
73...Dan / WA1FMM / Thousand Oaks, CA.