[amsat-bb] Recording TX & RX from one or two radios?

[Bill Acito]

[[I haven't done this yet but I think others have and I plan to do it one
day: most recorders are stereo. Get a *channel* splitter (I bought one on
Amazon) and send radio audio to left channel, say, and an external mic to
right.]]

I have been doing this for years. The key/trick is that you have to insert a 40db pad on the rig audio side because the audio levels (mic vs rig) are very different. Most audio recorders use a AGC of some sort, and with no balancing L to R, the AGC will adjust for the stronger rig audio, and lower its overall sensitivity so you won't hear the mic channel. Inserting the 40db pad balances the left and right and will give you good audio on both sides.

Bill W1PA