[WriteLog] CW PTT

[Kurszewski Chad-WCK005]

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 at contesting.com 
> [mailto:writelog-bounces at contesting.com] On Behalf Of Clive Whelan
> Sent: Thursday, June 16, 2005 2:24 PM
> To: writelog at 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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