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

[Greene, Stephan A]

I think you want a "DJ splitter" cable.  Typically a stereo (TRS) plug
and two separate MONO output jacks, one for the left and one for the
right channel.  DJ's use one to monitor a track they are playing on one
channel while cueing up a 2nd track in their headphones; the DJ software
is configured to output to one track or the other.  Use when you have a
laptop or tablet with one audio output and don't want to or can't use a
mixer or 2nd (USB?) audio device.  Usually well-made because DJs hate
equipment failures mid-gig.  (and we hams hate equipment failures in
mid-pass!)  I have a Griffin DJ Cable and will have to test this myself.
Native Instruments (Traktor) and other DJ equipment vendors sell these.
$10-$12 give or take. 

The use in this thread is to combine 2 signals into one input jack,
while keeping them on separate tracks.  Play the recording back in
software like Audacity as suggested by others. 

I agree the easiest approach is wire a cheap electret mic for local
(Uplink) audio.  If you tap audio from your uplink radio mic input, you
may need to pad down the audio level to the recorder and take steps to
isolate the recording line from the radio input. 

The other "splitter" cable described connects left and right channels in
parallel and is intended .  Usually called a headphone audio splitter.
You may get a mess unless you wire the plugs from your downlink and
local audio to put signals on just one channel.   More trouble than it
is worth IMO.  YMMV.

73 Steve KS1G

-----Original Message-----
From: John Brier [mailto:johnbrier at gmail.com]
Sent: Friday, May 18, 2018 10:52 PM
To: Steve Kristoff
Cc: AMSAT BB
Subject: Re: [amsat-bb] Recording TX & RX from one or two radios?

Probably because I used the wrong term. It is a breakout cable. Here is
what I have. Haven't used it yet, but it should work.

<url removed for berevity>

73, John Brier KG4AKV