Topband: Keying from CT logging program

[James Wolf]

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 at contesting.com 
> [mailto:topband-bounces at 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
> 
> 
> _______________________________________________
> Topband mailing list
> Topband at contesting.com 
> http://lists.contesting.com/mailman/listinfo/> topband
>