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

[John Brier]

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.

For me I plug my headphones into the recorder to monitor the radio so I
would have to splice the left channel to both right and left so I didn't
have my external mic audio in one ear and the radio in the other.

One reason I want to do this is because it will make transcribing QSOs from
the recording easier. Just open the waveform in Audacity or another similar
app and you can see anytime you talk on the local mic. Skip there and
transcribe the contact. Otherwise for me at least I end up having to listen
through a lot/most of the recording trying to find myself.

73, John Brier KG4AKV

On Fri, May 18, 2018, 08:13 Don KB2YSI <kb2ysi at gmail.com> wrote:

> I would think there is a dual input recorder available, one for the RX one
> for the mic, or use 2 recorders and splice the audio later.
>
> 73, Don KB2YSI
>
> On Fri, May 18, 2018, 04:25 Ken M <va7kbm at outlook.com> wrote:
>
> > 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
> >
> >
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> _______________________________________________
> Sent via AMSAT-BB at amsat.org. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership. Opinions
> expressed
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> AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
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>