Now thats a great place for a latching relay if you must use a relay. ?
Dr.?William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ
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Owner - Operator
Big Signal Ranch ¨C K9ZC
Staunton, Illinois
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Owner ¨C Operator
Villa Grand Piton - J68HZ
Soufriere, St. Lucia W.I.
Rent it:
email:??bill@...
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On Jan 21, 2018, at 4:34 AM, Raj vu2zap <
rajendrakumargg@...> wrote:
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, vu2zapAt 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
K9HZ