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YT7MPB > PACKET 23.03.21 14:11l 53 Lines 2570 Bytes #999 (0) @ WW
BID : 26825_YU7BPQ
Read: GUEST
Subj: Re: Two modems --> One radio = How?
Path: IW8PGT<IZ3LSV<I3XTY<I0OJJ<EA2RCF<LU9DCE<N7HPX<KC9VYU<N3HYM<YU7BPQ
Sent: 210323/1308Z 26825@YU7BPQ.#NSD.SRB.EU LinBPQ6.0.21
On 2/18/21 17:18, YT7MPB wrote:
> Hello all,
>
> It makes me wonder how to attach two modems (SCS Dragon DR-7400 for
> pactor & robust packet, and RIGblaster Advantage sound-card interface
> for 'classic' packet and other software modes) to a single radio. I
> would like to have them both attached to the radio all the time, so to
> avoid switching over their audio cables. But here I use the club's
> transceiver, and would not like to take any risk. For now I switch over
> audio cables, where in both cases the TX/PTT line goes to the MIC jack
> and the RX line to the headphone jack (both on front side of FT-1000MP MkV).
>
> For those who are not familiar with those modems, SCS Dragon DR-7400 has
> only one radio port, and uses 8-pin DIN connector to the radio. (At the
> radio side, I divided the audio cable into 2 cables, one goes to MIC
> jack and the other to headphone one.) So far - so good. And as
> RIGblaster Advantage interface already uses two separate cables that go
> to the same jacks on the radio, I wonder whether I could join the cables
> for both devices before going to the radio's jacks, so I could listen
> the frequency by using both devices in parallel. (Of course, to transmit
> by only one of them at a time, what is possible in BPQ software.)
>
> By the way, both devices eat separate USB connectors at the computer for
> audio IN/OUT line (and RIGblaster for its power supply). So I suppose if
> I just solder the respective wires together, it might appear some
> parasitic interference if I use then both devices in parallel. Maybe I
> would need some isolation transformer or like. Any idea?
Hello all again,
Seems that I managed to do what I had asked above. For the RX side I
used a kind of a "splitter" adapter (divider, or whatever you name it)
that inserts itself into the 6.3 mm headphones jack of FT-1000MP and has
two 3.5 mm outputs, so that way I got two 3.5mm jacks for receiving
audio by both modem/interfaces.
For the TX side, I purchased two male 8-pin microphone plugs and also
one female 8-pin microphone plug (of the version that goes to a cable,
not to an enclosure box etc.). So I just soldered two very short peaces
of UTP/FTP cable, their ends to respective pins of both male plugs (to
produce a single one plug) and attached that cable end to the female
plug, which I then inserted to the microphone jack of the radio.
Both RX and TX works with two modems/interfaces and one radio, without
any need to pull out / push in respective audio cables.
--
73 de Misko YT7MPB@YU7BPQ.#NSD.SRB.EU
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