Sorry, what I am referring to is the uBitx!
At 21-01-2018, you wrote:
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Gary,
What did you do about the TX final filter relays? they click every time
the PTT is pressed.
I have disconnected the line TX 12V line from the three filter relays
next to K3 and directly wired 12V from C76 at the audio amp.
Now the relays stay on BUT the RX power draw has gone up.
Do share your mods.. I am interested in QSK!
Raj, vu2zap
At 20-01-2018, you wrote:
>Hi Allard;
>
>I replaced the relays to switch and purge the TX/RX supply lines, and
a SPDT RF switch to isolate the receiver during Transmit. It all switches
in less than a microsecond, but with all the capacitive loading it has to
dump, it's probably moving up to somthing close to a millisecond. QSK
speeds are not an issue. The transmitter transmits instantly, and the
receiver recovers to full sensitivity between dits at between 40 and 50
WPM (measured it at 48 WPM with my keyer at max speed), but I rarely
operate at 30, and 35 is approaching my maximum copying speed.
>
>72
>
>Gary, N3GO
Raj vu2zap