[arm-allstar] Baofeng COS without opening the radio

[Richard Perks]

Yes Doug. I'm trying that with the rims from George. It's been 2 weeks and
nothing received yet and there's no tracking. I'm still optimistic. What
blows me away is the difference in price between the very cheap fobs USD 3
v DMK @ 75. How can there be such a difference and DMK still have a market ?

On Sun, 3 Mar 2019, 17:44 "Doug Crompton via ARM-allstar", <
arm-allstar at hamvoip.org> wrote:

> Rick,
>
>   I am told from a reliable source that if you use US mail first class mail
> NOT priority, Not UPS or FEDEX  the shipping to AU is quite reasonable.
>
>
> *73 Doug*
>
> *WA3DSP*
>
> *http://www.crompton.com/hamradio <http://www.crompton.com/hamradio>*
>
>
> On Sat, Mar 2, 2019 at 11:28 PM "Richard Perks via ARM-allstar" <
> arm-allstar at hamvoip.org> wrote:
>
> > Thanks for posting this up Steve - Looks very interesting as I'm looking
> to
> > reduce the cost of building a node. The DMK URiX RIM works well but with
> > the high cost of shipping from the US to Australia it's very expensive.
> > I've ordered up some different types with cheaper shipping but wanted to
> > try the super cheap to compare. My problem is I don't know the first
> thing
> > about how to etch. Any chance you could point me in the right direction
> > please ?
> >
> > 73
> > Rick
> > VK4HC
> >
> > On Sun, 3 Mar 2019, 11:55 "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
> > > _______________________________________________
> > >
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> > >
> > > Visit the BBB and RPi2/3 web page - http://hamvoip.org
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