Tom, K4NR asked:
> What's with Key 1 and Key 2 on the QSK-5?
My use: my "fix" was to connect the key/ptt line directly to
the "Key 1" input of the QSK-5, and the "External T/R" output
on the back of the transceiver is connected to the "Key 2" input of
the QSK-5. I make NO connection to the QSK-5 AUX socket,
no need (it is sort of an "after the fact" output signal that now the
QSK-5 switch is activated, I could not find a use for it, hi).
Why this way--To quote a couple lines from the -5 manual:
" The transceiver MUST have the proper sequencing of the RF and
QSK output lines. The transceiver QSK line must pull low BEFORE
RF appears on the output connector and release AFTER the RF
envelope reaches zero to operate with any QSK switch."
Note, in Ameritron's language, "QSK line" = the T/R relay
output from your transceiver.
Also, it seems the Key 1 input jack must go low immediately with
key down as this is what closes the linear amp relays. A "ground"
input signal to Key 2 is what changes the diode gates from
rcv to xmit, and THEN AUX is pulled low.
It seems to me to make no sense to wait for AUX to go low to
generate an input signal to Key 1! Connecting Key 1 directly
to the keyer, a la fig 2c, seems to me to be the correct connection.
But, how do you get the transceiver to stop putting out RF
BEFORE the QSK line goes low??? In both fig 2a and 2b
connections, the QSK line is used as the input to Key 2! So,
yes, this would keep the gates set to xmit until the QSK line went
low.
In the case of figs 2a and 2b, your keyer connects directly to
the key input of the transceiver. The Key 2 line connects to
the transceiver QSK line. This QSK line must be a
wire which goes low with the key signal, but somehow stays
low until sometime after the key is up, and RF output from
the transceiver has stopped.
What connection to/from the transceiver goes immediately low
upon key down and stays down after key up for a time?
The only immediate low on key down is from the key itself.
So, I am leaving the -5 Key 1 jack "diode connected" to the
keyer output. But, after some thought I decided to go back
to the T/R amp relay output jack on the back of the transceiver.
This is a line that must go low before RF comes from the
transceiver and stay low for a moment or so after RF stops;
it is the only output from the rig I could imagine would fit the
needed description of the "QSK line". So I tried it.
I connected the Key 2 input jack of the -5 to the T/R Relay
output jack on the back of the transceiver.....
Voila!! Now everything seems to work as it should. The
fuse lamps do not flash. I have gradually increased output
power up to about 300 watts and no sign of problem!
Full rcv signal amplitude between CW elements using the
fast QSK setting on the Omni.
But, I have left the AUX output from the -5 open, connected
to nothing. Don't really see what the point of the direction
in fig 2a is to connect that jack over to the Key 1 line; or
maybe it is a way to operate SSB, but would have to find
somewhere else to connect the Key 1/AUX lines. Figure
2a says to connect to the VOX relay. Isn't that the same
T/R relay jack to which I now have Key 2 connected?
My "fix" now is to use my CW st. key as my PTT switch
when operating in the CW mode, hi. Works fine, and
avoids any possibility of hot switching somehow using
SSB mode.
Have fun with the QSK-5!
73, Jim KH7M
|