[arm-allstar] Baofeng COS without opening the radio

Sun Mar 3 10:35:58 EST 2019

Rick,

 The DMK URI's have actually gone up in price. The ham version is now $85!
Within US shipping would bring this to the low to mid $90's.  This would
probably be over $100 total price for AU. I don't have a reason for it
other than greed. The URI product is over designed for what is needed for
Allstar. With the SW low pass in our code you don't need it in hardware.
The parts are rather inexpensive with the CM119B coming in at less the
$1.50 in quantity.  The new URI's are now using the CM119B which has some
different specs than the previous CMEDIA chips. It has lower output levels
which makes it hard to use without some additional amplification on some
radios. The DMK board has an additional opamp that can be implemented but
as it stands in the current schematic it only has a gain of about 2. They
have not updated the schematic as it still shows the CM119A. The ARA boards
also use the CM119B chip and have an additional opamp to compensate for the
lower output in the rev2 boards which will be out soon.

*73 Doug*

*WA3DSP*

*http://www.crompton.com/hamradio <http://www.crompton.com/hamradio>*

On Sun, Mar 3, 2019 at 5:16 AM "Richard Perks via ARM-allstar" <
arm-allstar at hamvoip.org> wrote:

> 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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