[arm-allstar] Can someone listen to this?

Sun Mar 25 20:27:52 EST 2018

Mike,

 I think what you are experiencing is possibly something we are seeing in
the FET driven PTT. Try putting a 10K resistor with a .01 uf capacitor in
parallel from the gate of the 2n7000 to ground. The 2n7000 is often used as
a DC switch like we are using it but we often forget it is a wideband part
and can be used to generate RF well up into the HF spectrum. I suspect it
is F getting into the FET that could be causing your problem.  See if this
solves your problem.

Also be aware that if you bring up the Asterisk client from the menu and
you hit your DTMF buttons one by one you should see the tone decode in the
text there. Press 0-9 ABCD #*  and you should see then accurately decode in
the display.

*73 Doug*

*WA3DSP*

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

On Sun, Mar 25, 2018 at 3:16 PM, "Michael Staggs via arm-allstar" <
arm-allstar at hamvoip.org> wrote:

> Yes, I quoted my original email to you. You answered me and I built that
> PTT circuit exactly like you have it there. It was stuck on PTT and that
> appears to have solved it. The PTT doesn’t stick anymore. It appears to
> hear my DTMF tones and respond to them. I have the resistors on the Baofeng
> exactly as described. I built the PTT circuit you described. When I send
> DTMF tones to get status or the time, it hits PTT, clicks about 10 times,
> lets up, hits PTT again, clicks about 10 times, lets up… and does that
> about 10 times.
>
> You can hear what it’s doing here: https://instaud.io/1X0q
>
> So, what I’m asking is why it’s doing that? It’s responding to DTMF tones.
> It is hearing me. But, that’s what I’m hearing back.
>
> Sent from Mail for Windows 10
>
> From: Doug Crompton via arm-allstar
> Sent: Sunday, March 25, 2018 12:49 PM
> To: ARM Allstar
> Cc: Doug Crompton
> Subject: Re: [arm-allstar] Can someone listen to this?
>
> Mike,
>
>   I think I answered this before as I remember you sending this email. I
> would follow the simple FOB modification howto on the hamvoip.org web
> page.
> We don't remove any resistors and although you could do that the more you
> mess around with the board the more you have the chance to screw something
> up. There is also no reason to remove the connectors on the FOB. You can
> solder directly to the connector leads.
>
> You must use the PTT circuit as described in the hamvoip.org howto
> schematic as well as the diode in the COS line and use the resistors to
> lower the audio levels between the 888 and the FOB.  You use  cosfrom=usb
> NOT usbinvert.
>
> Also be aware that the 888 can introduce RF feedback into the circuit so
> don't use the rubber duck antenna. It is best to use an external antenna a
> distance away. Strange things can happen when you get RF back into the
> electronics.
>
>
> *73 Doug*
>
> *WA3DSP*
>
> *http://www.crompton.com/hamradio <http://www.crompton.com/hamradio>*
>
>
> On Sun, Mar 25, 2018 at 11:32 AM, "Michael Staggs via arm-allstar" <
> arm-allstar at hamvoip.org> wrote:
>
> > Sorry… Baofeng 888s
> >
> > I wired the chip up COS and PTT to the pins as shown here:
> >
> > http://www.garydion.com/projects/usb_fob/
> >
> > I wired the left and right jacks up according to here:
> >
> > https://hamvoip.org/hamradio/usb_fob_simple_modification/
> > images/DSC02054.jpg
> >
> > And I wired the Baofeng 888s up according to these instructions:
> >
> > http://crompton.com/hamradio/baofeng888/New-888-mods.pdf
> >
> > I used the RPi2-3 Image Version 1.5rc16 image
> >
> >
> > Sent from Mail for Windows 10
> >
> > From: Doug Crompton via arm-allstar
> > Sent: Sunday, March 25, 2018 8:59 AM
> > To: ARM Allstar
> > Cc: Doug Crompton
> > Subject: Re: [arm-allstar] Can someone listen to this?
> >
> > Mike,
> >
> >    I am not sure what you are doing there. What radio are you interfacing
> > to? What circuit are you using? What FOB are you using? Did you modify
> the
> > FOB?
> >
> >
> > *73 Doug*
> >
> > *WA3DSP*
> >
> > *http://www.crompton.com/hamradio <http://www.crompton.com/hamradio>*
> >
> >
> > On Sun, Mar 25, 2018 at 1:58 AM, "Michael Staggs via arm-allstar" <
> > arm-allstar at hamvoip.org> wrote:
> >
> > > I’m making great progress with my node. When I plug the pi in, it shows
> > up
> > > on allstarlink as active. I had problems with it holding PTT down and
> > just
> > > clicking. So, I added the resistor, transistor and diode on PTT as in
> the
> > > schematic. Now, however, I’m getting this. I told it to give me the
> > > status…or maybe the time. Instead, I got these short little
> transmissions
> > > of clicks. You can hear it here:
> > >
> > > https://instaud.io/1X0q
> > >
> > > On receive, I already have the 10k resistor. Is this because I didn’t
> add
> > > the 47k resistor and 10uf capacitor before it goes to the FOB? Or is
> this
> > > completely different? I really don’t want to keep buying electronic
> > > supplies if it’s not going to work anyway, but if it’s truly what’s
> > causing
> > > this then I will buy them. I have a 68k resistor and 100uf capacitor,
> but
> > > those won’t work, will they?
> > >
> > > Sent from Mail for Windows 10
> > >
> > > _______________________________________________
> > >
> > > 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
> > _______________________________________________
> >
> > 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
> >
> > _______________________________________________
> >
> > 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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>
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>
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>
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>
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