- Hi Owen, The TxDF box is for setting the transmit frequency. In the Terrestrial JT65 modes, you should always set this to the same as the receive signal. InMessage 1 of 2 , Feb 28, 2009View Source
The TxDF box is for setting the transmit frequency. In the Terrestrial JT65 modes,
you should always set this to the same as the receive signal. In other
words, if you want to talk to someone, and you see their signal at
+250, click on their signal at +250 and then activate the TxDF button.
That way, you transmit on their frequency and don't work split. Also,
it is not a good idea to transmit on a DF=0. Every newbie does this
because they don't understand the TxDF button. It is very hard to work
someone when there are 5 other signals at DF=0.
My personal preference is to double click on a persons’ signal, and then
activate the TxDF button. This does 2 things that I like. It sets my
transmit frequency to the transmit frequency of the station I want to
work, and it sets the tol to 50 so that I don't read a station 400 Hz
away who happens to have a stronger signal than the person I want to
work. Actually, I change the tol to 10 or 25 quite a bit for this
reason as well. With all of this set, the next item I do is
"Double-Right-Click" the persons callsign, which sets all of you
messages correctly to terrestrial JT65 messages(as opposed to EME
messages). Then, all I have to do is select every other message when it is my turn to transmit.
The BW setting is a matter of taste, and what you want to look at in
the SpecJT window. Do you want to see signals 2400Hz away? Or just
1200Hz away. It is easier to zero in on a signal in the 1200 Hz BW
than in the larger.
HTH, 73's de WY5R - KD
I would like to understand in detail how one uses the TX DF box in
either FSK 441 or any of the JT65 modes. What the manual says does
not work for me. I would also like to learn the best ways to use the
BW capability in the Spectral display. Is the BW setting -1200 to
+2400 better than the other alternative? Or, are there instances when
to use one or the other? I understand the "0" DF and how to use that
with narrow Tol (25 or 50) and how that zero's Freeze DF, but I don't
understand the actual purpose. Newbie questions I know but I really
do not find the manual very helpful, I hope the group will help me.
Thanks alot, Owen, K3CB