Re: At a crossroads

Stephen Melachrinos

Both the Easy-Digi and the Unified Micro are very simple interfaces. They're pretty much the same as the Buxcom Rascal that I bought when I first put my then-new FT817 on PSK about 16 years ago. But neither directly addresses Justin's fundamental issue, that of a PC that does not have separate input and output audio jacks. Instead, it has a combined input/output jack. This is typically called a TRRS jack, for tip, ring, ring, sleeve, as there are two rings between the tip and sleeve instead of the single ring found on standard stereo plugs. And a consequential problem is that there are two standards for wiring a TRRS. One is called AHJ (American Headset Jack) or CTIA (for Cellular Telecommunications Industry Association)--the second is the OMTP (Open Mobile Terminal Platform). OMTP is an older standard ("more established and more formalized" according to one reference) while AHJ is used by Apple and some newer cell phones.

I've just done some searching on websites and can't figure out whether the Lenovo FLEX 5 uses AHJ or OMTP. Until we figure that out, NONE of these suggestions will make any difference to Justin. Even Mike WM4B's suggestion on a specific Monoprice TRRS cable (good suggestion--I like Monoprice) will only work for AHJ/CTIA, and will be absolutely wrong if the Lenovo uses OMTP.

So until someone can answer the OMTP vs AHJ/CTIA question for the Lenovo, the only suggestion that avoids use of the TRRS jack on his computer is bypassing the jack by using an external sound card, such as a TigerTronics SignaLink or similar. And knowing Justin, my suggestion would be to go for something simple even if it's a little more expensive. The SignaLink has only one cable (a single USB) to the computer. Easy-Digi, Unified Micro, and my own Buxcom Rascal all require three cables (audio in, audio out, and PTT), and that's not including a TRRS adapter. 


-----Original Message-----
From: David Rock david@... [070] <070@...>
To: 070 <070@...>
Sent: Sun, Sep 3, 2017 12:20 pm
Subject: Re: [070] At a crossroads

I’ve been using an Easy-Digi device with a Raspberry Pi to run my echo link node for about 3-4 years now. Works great.

It’s really designed for digital modes like PSK-31. You can buy the unassembled kit for about $10 and the fully-assembled + case for $20+shipping.

Still love my SignaLink, though. :-)


> On Sep 3, 2017, at 11:15, Jerry n9avy@... [070] <070@...> wrote:
> I won one of those at W9DXCC a few years back, assembled it, but never put in on a radio. Keep running across it in basement and think about hooking it up, but always seem to move on to other things.
> Jerry N9AVY
> From: "k9wis@... [070]" <070@...>
> To: 070@...
> Sent: Sunday, September 3, 2017 11:01 AM
> Subject: Re: [070] At a crossroads
> If your cheap like I am look at the Unified Microsystems interface..Ive been using one for years...only 25 bucks
> Brian K9WIS
> ---- "'Justin Mattes-KC2GIK' kc2gik@... [070]" <070@...> wrote:
> > Folks
> >
> > As many know, with the exception of last year's APE with Steve,W3HF, I
> > have been off the air for close to three years. Last year I moved down to
> > Cape May,NJ from Woopdcliff Lake and I can't use my dipole because of
> > property restraints My HF rig is a used FT-897 with the knobs broken. I
> > just recently got a Lenovo FLEX 5 laptop that has a combined audio
> > input/output jack, I don't know what PSK interface I could use, maybe a
> > signal link USB. I have tried to do some research but have come up empty.
> > I am HEARING PSK signals so I know the antenna works!
> >
> > Thanks\
> > Justin, KC2GIK
> >

Posted by: David Rock <david@...>

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