There is some concern that this scheme connects RS232c voltage levels, taht can be a high as 24 volts
to transistor level, TTL components designed to operate a 5 volts. Modern workstations, laptops and
USB to serical devices tend to operate at the lower range of the RS232 voltage range. I have used a
straight through cable on many such devices without failures. Be Warned.
Pinout to wire an RJ12 plug and replace the Mic for data communications:
Wires-X traffic can be very anoying on receivers that are not able to decode it.
Here are the program setting for CTCSS on RX so you dont hear the Digital noise
(eg Wires-X) on the 70cm repeater when its on if you have a 2020.
Set in the channel list a frequency for CTCSS on RX to 91.5 and 91.5 in the TX set.
In sub audible signaling set in RX ALL. In Monitor function disables all mutes.
Tick monitor Key short and tick monitor key long.
This will allow you to set the push button to long press and disable all mutes this
allows you to disable the function by pressing the left hand bottom button.
A long press now mutes, and short press only CTCSS mute disabled.
The DM1 is a low price DTMF keypad microphone originally designed to work with
Tait 2000 series radios but is suitable for use with many other types of radios.
The curly cord on this microphone is terminated in an RJ12 connector and is also
fitted with two different rubber boots suitable for the Tait 2000 series radios.
Simply remove the plug and boots for use with any type of radio other radio.