So, you want to play digimodes?

well, you're already halfway there if you're reading this, chances are, you have a soundcard on your P.C.

Fiddling around with the line in/line out/speaker volume controls on your soundcard can be time consuming, especially if you're chasing a signal, however, there is a clever bit of software called QUICKMIX. This can recall all your mixer slider positions with just one click (doesn't work on Windows 7).

http://www.ptpart.co.uk/product-withdrawn/


For receiving:-

It couldn't be simpler, line out from radio to line in on P.C.

Some radios don't have a line out, but this can be added easliy if you have a "3357" mixer chip on your radio (most do).


You CAN use the speaker output, but you will have to carefully adjust the volume on the radio to about 1.3V peak to peak for the P.C.


For transmitting:-

VOX is the easy way out here, but beware, all Windows sounds will be transmitted and is not recommended!

If you have a serial port, you won't have to buy, or build a complicated USB interface, the one have is five components, including the connectors.


Most digimode programs energize the serial port's RTS pin when they go into transmit mode, and we connect this to the PTT line of the transceiver.

The transmitted audio part of the cabling can simply be a connection to the radio's microphone from the line out on the soundcard, although, many hams like to isolate this signal with a small 1:1 audio transformer. The best source for these is dialup modem cards.