[TenTec] Argosy with Linear

Mike Bryce prosolar at sssnet.com
Fri Mar 6 12:54:34 EST 2020

bob and the boys...

the original ten tec amp accessory did provide a delay. There is (was) a small trimmer on the pcb to set the time.

My replacement provides a way of adjusting the t/r delay time, too.

Mike, WB8VGE
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> On Mar 6, 2020, at 12:05 PM, Bob McGraw K4TAX <rmcgraw at blomand.net> wrote:
> Yes that is correct, the number I have is 80853.    It allows the relay on that board to connect the coil to the T/R line and the other end of the coil to connect to +12VDC.   There is a diode across the coil for back EMF.  The relay contacts are connected to a RCA connector on the rear thus providing a closure when the T/R line is in transmit mode.
> I would comment......the Argosy does not provide any delay between key closure and RF output.  This WILL cause hot switching of any amplifier being controlled by the T/R relay and subsequently the amplifier.    Also the Argosy is always in full QSK mode thus the relays will operate with every key closure.
> One can use a reed relay or like to handle the switching for SSB as there is little likelihood when using  manual PTT.   For SSB VOX and CW, be assured that hot switching will take place.       I am not aware of any method to delay the RF output after key closure.
> 73
> Bob, K4TAX

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