Not being familiar with the drive requirements of the amp or the limitations
of the transceiver, it seems you could parallel the two paths using a
steering diode in series with each control line.
Jim, KR9U
> -----Original Message-----
> From: topband-bounces@contesting.com
> [mailto:topband-bounces@contesting.com] On Behalf Of Gary Nichols
> Sent: Friday, January 30, 2004 8:48 PM
> To: topbandreflector
> Subject: Topband: Keying from CT logging program
>
>
> Being a new owner of an IC746pro which I used in the CW
> contest this past weekend revealed a problem in that the
> first element of code is sending for example "AD9SV" instead
> of KD9SV which was programed into the F4 menu. Using a foot
> switch overcomes that problem "if" the switch is activated
> before CT keying starts. Reading in the CT manual (v9.37)
> page 19 says:
>
> "CT also provides a PTT (push to talk) control signal on the
> parallel ports, which is asserted one baud (dot period)
> before CW sending begins. This provides time for amplifier
> relays to close before RF arrives from the transceiver, in
> cases where the amplifier switching is slow or the
> transceiver sequencing is poorly designed"
>
> My question to the reflector: is it possible or can the
> QSK/TR input of my antenna switch/keying circuit be
> paralleled (Hsend signal and PTT from CT) without causing
> problems? If I transmit without CT or the Hsend connected I
> will toast my changeover relay/pre-amp circuits. Has anybody
> reading this had problems of not sending the first code
> element and found any other solutions. Thanks in advance, de
> gary, kd9sv
>
>
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