[Trlog] Parallel Serial Port

[Tree]

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
switching.

Tree

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.
>
> http://home.comcast.net/~kk1l/kk1l_so2r/kk1l_so2r.pdf
>
> http://home.comcast.net/~kk1l/kk1l_so2r/index.html
>
> 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
>> radio.
>>
>> 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
>> to
>> the active radio.
>>
>> Tree
>> 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
>>> serial
>>> 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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