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

Fri May 18 20:32:33 UTC 2018

John, I'm having a hard time finding a channel splitter on Amazon. Do
you happen to have a brand name or possibly a URL link to the one that's
working for you? Thanks! 

Steve AI9IN 

On 2018-05-18 08:48, John Brier wrote:

> 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
are solely those of the author, and do not reflect the official views of
AMSAT-NA.
Not an AMSAT-NA member? Join now to support the amateur satellite
program!
Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb