Locked Re: FT8 F/H TS850 settings
Can someone tell me how to set my TS850 with wsjtx in F/H mode.
I use a signallink interface and a cat cable (rs-232) to my computer
Apparently the "rig" setting for the split does not work. Should I use the "fake-it" setting ?
It seems to work so, I made a few qso's, but the erratic shifts of the VFO alwas frighten me
If the DX is on DF 539, and I'm calling on DF 1600 for instance, my VFO shifts by one Khz and my tx is right on 539 when I reply
I suppose it's normal, since I get a RR73...?
73, Guy F6DKQ
the VFO dial frequency changes should not be erratic. The VFO
dial frequency is shifted during transmissions, such that the Tx
audio can be maintained between 1500 Hz and 1999 Hz, this is done
to keep the audio within the bandwidth of your SSB Tx filter, thus
avoiding unwanted attenuation. The Rx VFO dial frequency remains
unchanged. Shifting the Tx VFO dial frequency also has the benefit
of attenuating any audio harmonics as they will always occur above
3000 Hz and be above the low pass cut off of your Tx SSB filter.
Tx VFO dial shifts are calculated in 500 Hz steps, e.g. with an Rx
frequency of 14074.0 kHz here are some examples:
Tx audio offset Tx VFO QRG Audio sent to rig --------------- ---------- ----------------- 200 14072.5 1700 499 14072.5 1999 500 14073.0 1500 999 14073.0 1999 1200 14073.5 1700 1700 14074.0 1700 2100 14074.5 1600 2700 14075.0 1700 3250 14075.5 1750 3700 14076.0 1700 4400 14076.5 1900
and so on.
Using "Settings->Radio->Split Operating->Rig" should be your first option, only try "Fake It" if the rig does not support SPLIT or if some other problem occurs. When using a SignaLink USB, which keys the rig independently, you should normally select "Settings->Radio->PTT Method->VOX" as WSJT-X should not be keying the rig directly. To minimize the uncertainty of exact timing of the transitions between Rx and Tx it is best to turn the SignaLink USB DELAY knob to minimum. This will often improve the reliability CAT control when combined with a SignaLink USB interface for audio and PTT.