[arm-allstar] Baofeng COS without opening the radio

Mon Mar 4 11:23:55 EST 2019

This sounds ideal to me!

---
Andy Thomas, NV6V

On 2019-03-03 19:54, "Doug Crompton via ARM-allstar" wrote:
> Steve,
> 
>  OK Thanks. We are already thinking about laying out a FOB board
> specifically for the Baofeng's. Most of the components are already on 
> our
> ARA-1 board now and it would be a minimal change to make it work with 
> the
> Baofeng's directly.  I want to breadboard it first and we have some
> speak/mic cables on order. I would say if all goes well we could have a
> product out in a month. The FOB would plug into the USB and a cable 
> would
> plug to the FOB and the radio speaker/mic. Very easy for the user. This
> will also make it easier to produce the yellow box nodes.
> 
> 
> *73 Doug*
> 
> *WA3DSP*
> 
> *http://www.crompton.com/hamradio <http://www.crompton.com/hamradio>*
> 
> On Sun, Mar 3, 2019 at 10:48 PM "Steve via ARM-allstar" <
> arm-allstar at hamvoip.org> wrote:
> 
>> Certainly Doug, that's why I put it out there. Hope it helps. I'm also
>> still
>> looking at having some boards for just the interface made, if enough
>> people
>> are interested for me to order 100 I can get them for a little under 
>> $4 my
>> cost bare board with masks and silkscreen. I tweaked the layout a bit
>> today
>> and hand made another board with the layout mirrored from the original 
>> so
>> that the interface mounts over the top of the sound FOB. I'll put info 
>> and
>> pictures up in the same folder here in a few minutes, look in the
>> directory
>> with "Flip" in the name. It makes for a much smaller package.
>> 
>> I'll also put up the laser printer files that can be used to heat 
>> transfer
>> and make your own boards but it may be tomorrow before I get those up.
>> 
>> 73's
>> Steve - WB4BXO
>> 
>> -----Original Message-----
>> From: "Doug Crompton via ARM-allstar"
>> Sent: Sunday, March 03, 2019 2:39 AM
>> To: ARM Allstar
>> Cc: Doug Crompton
>> Subject: Re: [arm-allstar] Baofeng COS without opening the radio
>> 
>> Steve,
>> 
>> If this is reliable it looks like a good way to do it. If it is OK 
>> with
>> you I will add the info to the Baofeng  howto mods.  We also could 
>> easily
>> produce a board in quantity to do this if there was a demand. I find 
>> any
>> more that most do not want to turn on (or have) a soldering iron so 
>> any
>> amount of mods are out of the question. We are currently sourcing two
>> models of FOB's, the ARA1 and the ARA1+. Since the yellow box nodes 
>> use
>> Baofeng radios and are sold in large quantities it might be 
>> advantageous to
>> build a FOB specifically for those radios using this method. If we 
>> test it
>> and it works and we decide it could be a product do you have any 
>> objection
>> to our use of your circuit?
>> 
>> 
>> *73 Doug*
>> 
>> *WA3DSP*
>> 
>> *http://www.crompton.com/hamradio <http://www.crompton.com/hamradio>*
>> 
>> 
>> On Sat, Mar 2, 2019 at 8:55 PM "Steve via ARM-allstar" <
>> arm-allstar at hamvoip.org> wrote:
>> 
>> > I have put together a little circuit that allows connection to a Baofeng
>> > UV-5R HT providing COS without having to open and modify the radio
>> itself.
>> > This works great for AllStar, packet, APRS, or most anything that
>> requires
>> > a soundcard connection to the radio complete with COS. I have even used
>> > this circuit without the sound card to connect to an RC-210 repeater
>> > controller.
>> >
>> > I built the circuit based on the schematic of the UV-5R but I believe
>> most
>> > of the Chinese radios will work with it. I have tried it on several
>> > different Chinese radios including the Anytone AT-D868UV DMR radio and
>> > they
>> > all worked fine. However, even though these radios are mimicking the
>> > Kenwood two prong speaker/mic connector, this circuit will not work on my
>> > Kenwood TH-F6. This is due to the fact that the Chinese radios do not
>> > block
>> > the DC of the audio amp from reaching the headset, which is why you hear
>> a
>> > pop when the squelch opens and closes on these radios, and is what this
>> > circuit counts on to turn on Q1 and provide COS. The Kenwood doesn’t work
>> > (or have the pop) because it has a blocking capacitor and an MOS switch
>> in
>> > the audio line that prevents the DC from coming out the jack. But I’m
>> much
>> > happier using a $35 radio for this purpose anyway.
>> >
>> > I’ve hand etched a couple of boards for it so far and may send it to a
>> > board house to make some prettier boards, especially if others are
>> > interested in it (I’ve already quoted them and its just too pricey for
>> > small quantities, which is why I decided to hand make the few I needed).
>> > The boards I have made have some extra pads on the end to allow soldering
>> > directly to the audio jacks of one of the EBay sound FOBs, just makes it
>> a
>> > bit cleaner than having to cable that side of it, though it still
>> requires
>> > the two jumpers to the GPIO lines on the sound chip. Also note that there
>> > is an extra connection at Pin 4 on the sound card side that should allow
>> > using with an RA-35 or similar that already has the open collector driver
>> > for PTT. I have not tried this on an RA-35 but feel confident it would
>> > work, my target was primarily the CM108 open board sound FOB you can get
>> > on
>> > EBay and Amazon.
>> >
>> >
>> https://www.ebay.com/itm/CM108-USB-Drive-Free-Sound-Card-Laptop-Computer-External-Sound-Card-Module-New/263928310585?hash=item3d735a6b39:g:SSwAAOSwEVlcDcAU:rk:1:pf:0
>> >
>> > Also note there is no activity detection nor time out timer in this
>> > circuit, so I leave the TOT of the attached radio set to something
>> > appropriate in case things get hung up in transmit. And as with other
>> > interfaces, make sure to keep the RF from the attached HT from getting
>> > back
>> > into the RPi.
>> >
>> > Schematics, some pictures, and this doc can be found here, hope it helps
>> > someone.
>> >
>> https://www.dropbox.com/sh/lrv9uwkgx8tpm6y/AAD2syTNpZDwcjX1gA8zjV9Va?dl=0
>> >
>> > Steve – WB4BXO
>> > http://www.stevemobley.com
>> > _______________________________________________
>> >
>> > ARM-allstar mailing list
>> > ARM-allstar at hamvoip.org
>> > http://lists.hamvoip.org/cgi-bin/mailman/listinfo/arm-allstar
>> >
>> > Visit the BBB and RPi2/3 web page - http://hamvoip.org
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