[MRCA] U-329 cable for digital work

[KD2GIY]

Ray,
That cable connects to a digirig,
It's kind of same thing like a signal link.
I believe it has all the circuitry for a PTT and other things.

But it's a good idea what you're saying about bringing the power level up
with a dummy load.
Take a look at the link to see what I'm talking about.

https://digirig.net/product/digirig-mobile/



Best regards
Dave
KD2GIY

On Wed, May 27, 2026, 9:16 PM Ray Fantini <RAFANTINI at salisbury.edu> wrote:

> A pin-to-pin cables are crap! No impedance match between high impedance
> output of computer and low input impedance of the radio. Also how are they
> attempting to do the PTT control?  Maybe they assume you're using VOX?
> That's always fun outside of the program, and the computer is making random
> noise. The general rule for proper ALC is to start with outgoing audio all
> the way down and start turning it up slowly to you see output power. Start
> out using a dummy load and power meter first!  Most digital jockeys tend to
> drive the crap out of the radio and introduce distortion.
> I have bult several of these interfaces for use on GRC-106, Harris Falcon
> stuff and played around with it on your 70 without issues running both
> desktop and laptop systems. I use a 9-pin plug to an adapter with cables
> built up for the small microphone and large connectors on different radios.
> The transformer is a Bogen WMT-1 available on eBay
>
> Ray F/KA3EKH
>
> ------------------------------
> *From:* mrca-bounces at mailman.qth.net <mrca-bounces at mailman.qth.net> on
> behalf of KD2GIY via MRCA <mrca at mailman.qth.net>
> *Sent:* Wednesday, May 27, 2026 6:29 PM
> *To:* MRCA <mrca at mailman.qth.net>
> *Subject:* [MRCA] U-329 cable for digital work
>
> Riddle me this?
> Has anyone tried these cables for the digi rig?
> If yes, what radio did you use it with and how did you monitor your ALC so
> the digital signal did not over modulate?
>
> https://digirig.net/product/u329-cable/
>
>
>
> Best regards
> Dave
>
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/mrca/attachments/20260527/af53a640/attachment.html>