The slow one is a software command sent over the COM port,
whereas the fast one is a hardware signal. Hardware is definitely
better, if your hardware supports it (proper cable, etc.).
Chad WE9V
> -----Original Message-----
> From: writelog-bounces@contesting.com
> [mailto:writelog-bounces@contesting.com] On Behalf Of Clive Whelan
> Sent: Thursday, June 16, 2005 2:24 PM
> To: writelog@contesting.com
> Subject: [WriteLog] CW PTT
>
> Hi list
>
> I seem to have solved a problem which has bothered me for some time.
>
>
> Rather than use QSK when running SO2R and wear out the relay
> to no good
> effect, I set CW/PTT to command on COM port, but have always
> been troubled
> by a delay in returning to receive, which sometimes truncated
> the first
> character on a quick responder. I thought that perhaps this was a
> characteristic of my transceiver ( TS870 for reference), but
> on switching
> for test purposes to an IC7400 the same problem was
> experienced. I then
> changed the PTT method from "command on COM port" to " On lpt
> pin 16/ COM
> RTS" . So in both cases the command is going via the COM
> port, but in the
> first case there is a finite delay of a part of a dot, not in
> the second. so
> the problem is apparently solved, but being electronically
> challenged I am
> puzzled as to why.
>
> Is there a simple explanation perhaps?
>
> 73
>
> Clive
> GW3NJW
>
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