A signallink?will work, but is pricey and uses an onboard VOX approach.? There are cheaper interfaces which use the CM108 PTT control which is supported in Dire wolf and provides programmatic?control of PTT through?the 6 piin mini-din interface.
On Mon, Jan 17, 2022 at 3:15 PM Mark Griffith via <mdgriffith2003=
[email protected]> wrote:
A SignaLink works fine. You'll need to read the docs to find out how to setup the device name.
Mark
KD0QYN?
On Mon, Jan 17, 2022 at 1:35 PM, Don Rolph
An interesting question.
Some assumptions:
- you appear to be focused on Dire Wolf
- it seems you are focused on?Raspberry PIs
We can state up front that the internal sound capability of th Raspberry PI is inadequate: ?you will?need an add on sound system.
You are also left with the challenge of how?to handle?PTT: ?use hand held VOX or wire to PTT circuit in the handheld?speaker/mic connection.? The former is easy but clunky. ?the latter is hard to implement but effective.? The following may work:
-?
to provide the hardware PTT capability against the standard 6 pin mini-din connector.
Examples of Raspberry?PI packet interfaces can be found at:
-?
which discuss interfaces from?Raspberry PI ((Dire Wolf) to radios through?the 6 pin? mini-din.
I discuss?in:
-?
experiments with the IOS application using a Baofeng UV-5A and a Wouxun KG-UV6D.? Both gave quite acceptable?packet reception performance with packet reception on a par with my D72A.? Volume needed to be set to about 50%.
Packet send levels seem to be well controlled by the internal ALC circuitry.
The testing suggests that any handheld with the Kenwood?Speaker/mic connection will probably work reasonably well for packet IF you can obtain the needed the PTT behavior.
On Mon, Jan 17, 2022 at 1:33 PM Jon Adams <
n7uv.jon@...> wrote:
I occasionally build porta-digis that need to fit in things like ammo cans and can run on a SLA battery and 10-20 W solar power for indefinite periods of time. This means no mobile radios as their rx modes always burn way to much power.
I've used up all my old Yaesu/Vertex hand-held 2m radios. A few years ago I interfaced a Baofeng UV5 to a KPC3+, got that to work but the receive performance was pretty poor (seemed to be receiver distortion). I also got another Baofeng (not the UV5 model, but quite similar) to work with a custom-built PTT/audio interface to a Direwolf instance on an RPi, but again what I was finding was the receiver distortion was pretty significant and receive performance was poor.
Given that there's now several more hand-held radios that are available and a heck of a lot more experience tinkering with them, I was wondering if there is any general consensus on "good-enough" performing hand-held radios for APRS 1200 baud?
Cheers and 73 - Jon N7UV
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