[Trlog] Parallel Serial Port
tree at kkn.net
Thu Jan 23 13:36:22 EST 2014
Ron's design is essentially what I use as well. Pretty straightforward.
Keeping the grounds isolated on the microphone circuits is very important
to reduce ground looped induced RF feedback issues.
Instead of transistors - I used radio shack reed relays - which have now
lasted > 15 years without any issues. This enables me to not worry about
using grid blocked keying transmitters (or even cathode keying radios!). I
have two PTT contacts for use when I need to do RX antenna - or preamp
On Thu, Jan 23, 2014 at 10:15 AM, Ron Rossi <kk1l at comcast.net> wrote:
> This is what I used for quite a while. It is adapted from many other
> designs out there.
> 73 es God Bless de KK1L...Ron Rossi (kk1l at comcast.net) <><
> QTH: Jericho, Vermont
> My page: http://home.comcast.net/~kk1l
> On 1/23/2014 13:09, Tree wrote:
>> If you have "real" serial ports - you can use one each of them to both
>> interface to your radio AND send keying CW. You can use the parallel port
>> for the paddle input if you want and it will be directed to the correct
>> The other option is to build up a small relay box that is controlled from
>> the one parallel port - and have it switch the CW from the parallel port
>> the active radio.
>> On Thu, Jan 23, 2014 at 7:12 AM, K4LTA <k4lta at comcast.net> wrote:
>> For the 10 years that I have used TR Log, I have always keyed my 2 radios
>>> using parallel ports. I have now changed to another computer which only
>>> has 1 parallel port. It also has 2 serial ports for controlling my two
>>> rigs plus a couple of USB ports. Can I key one of my radios with a
>>> port or from a USB port to a serial port adapter cable? Any help or
>>> suggestions would be appreciated.
>>> 73 Bill K4LTA
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>>> Trlog at contesting.com
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