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

[Ken M]

Hi Patrick,

Of course you are right about full duplex recording (kicking myself for not thinking of that!).

For HF and all other half-duplex work, especially QRP from the field I’m looking for a wired solution so I don’t record background noise (and I use a headset). Anyway, that’s not a satellite application so I’ll take the question elsewhere.

Thanks!
73 Ken VA7KBM

On May 17, 2018, at 5:21 PM, Patrick STODDARD (WD9EWK/VA7EWK) <amsat-bb at wd9ewk.net<mailto:amsat-bb at wd9ewk.net>> wrote:

Ken,

It really is simple, if you are working full-duplex. Just
record the RX audio. You get the full exchanges, since
you will hear yourself and the other stations. A splitter
on the speaker of the radio receiving the downlink can feed
audio to a recorder and headphones/earphone/earbuds you are
using to hear the downlink.

For working HF or working satellites half-duplex, I just use
a recorder that picks up the radio's speaker audio and my
voice with its microphone. Then I get both sides of those
QSOs.

73!






Patrick WD9EWK/VA7EWK
http://www.wd9ewk.net/
Twitter: @WD9EWK or http://twitter.com/WD9EWK


On Thursday, May 17, 2018, Ken M <va7kbm at outlook.com<mailto:va7kbm at outlook.com>> wrote:
Hello AMSATers,

I'm looking to record both TX and RX audio to a digital recorder, either
at the QTH or in the field (but mainly in the field), in either of two
common scenarios:

1. TX from one radio, and RX from a different radio (as in satellite use
with one radio for uplink and one for downlink).

2. TX/RX from the same radio (as in a full-duplex radio for FM
satellites, or for non-satellite use).

I'm wondering if you know of a device (or a published circuit design)
that will allow TX/RX recording while isolating the radios from each
other and/or a radio's TX from it's RX, while linked to the same
recorder? I have to believe this is a well-solved problem within the
satellite radio community but I haven't found too many ideas for field
use. This is seems to be an easier problem to solve at the QTH if
recording to computer, with various sound interfaces (Signalink, etc.)
so my main interest is in field use with a digital recorder so I can
record my QSO's while juggling two radios plus antenna, etc. The easy
alternative is just to record the RX side, which is easy, and works for
logging but doesn't give you the full exchange.

Thanks & 73!
Ken VA7KBM