[arm-allstar] Yet another USB FOB Modification

[Doug Crompton]

WOW, when you are using a $50 BBB are you going to spend $100 for a USB interface??? I think not. The effort to make a $2.50 FOB work is well worth it at that cost. The DMK URI is only $70.
73 Doug
WA3DSP
http://www.crompton.com/hamradio


> Date: Sat, 15 Nov 2014 12:40:36 -0500
> From: n3xcc at zewireless.com
> To: arm-allstar at hamvoip.org
> Subject: Re: [arm-allstar] Yet another USB FOB Modification
> 
>  > One thing I always like to see is some LED's to indicate what is going on.
> I likewise. This along with other reasons is why I brewed by own interface. It's nothing fancy, but 
> it does have indicator LEDs, additional audio output filtering, (for driving a modulator directly) 
> and USB failure detection.
> 
> Frankly I was tired of trying to locate modifiable FOBs, then go through the time and effort 
> required to add all of the additional circuitry I thought necessary.
> 
> You can check out the USB-RIM here: http://www.repeater-builder.com/products/usb-rim.html
> 
> Scott
> 
> Scott Zimmerman
> Amateur Radio Call N3XCC
> 474 Barnett Road
> Boswell, PA 15531
> 
> On 11/15/2014 11:25 AM, Mark Herson, N2MH wrote:
> > Yet, yet another comment on FOB mods...
> >
> > I've done a bunch here on pc prototype board. One thing I always like to
> > see is some LED's to indicate what is going on.
> >
> > In addition to the green heartbead LED, I also include a red LED to
> > indicate PTT and a yellow LED to indicate COR coming into the fob.
> >
> > The red LED needs another transistor in parallel to the usual PTT LED.
> > This keys the red LED which is then connected to +5 VDC through a current
> > limiting resistor.
> >
> > The yellow LED is connected from the incoming COR line through a current
> > limiting resistor to +5 VDC. This limits the incoming COR to an active
> > ground from the radio equipment. Fortunately, this protects the sound fob
> > from an incorrect COR condition if the radio is turned off or otherwise
> > disconnected from the FOB.
> >
> > +5 VDC is picked up from the sound fob.
> >
> > This whole topic reminds me of YAPP from the early days of packet radio.
> > YAPP was a file transfer protcol customized for packet radio. YAPP stands
> > for Yet Another Packet Protocol :-)
> >
> > 73, Mark, N2MH
> > Allstar Node 40831
> > ACID plus 2 BBB's and counting...
> >
> >> Date: Sun, 9 Nov 2014 02:11:25 -0500
> >> From: Doug Crompton <doug at crompton.com>
> >> To: "arm-allstar at hamvoip.org" <arm-allstar at hamvoip.org>
> >> Subject: [arm-allstar] Yet another USB FOB Modification
> >> Message-ID: <BLU172-W299469D7812B52ECE86A28BA830 at phx.gbl>
> >> Content-Type: text/plain; charset="iso-8859-1"
> >>
> >>
> >> Here is a link to my modification of the USB FOBS recently noted on this
> >> list and available from ebay at $24 for a lot of 10. I will be adding
> >> this link to the BBB web Page.
> >>
> >> http://crompton.com/hamradio/usb_fob_modification/
> >>
> >>
> >> 73 Doug
> >> WA3DSP
> >> http://www.crompton.com/hamradio
> >
> >
> > _______________________________________________
> >
> > arm-allstar mailing list
> > arm-allstar at hamvoip.org
> > http://lists.hamvoip.org/cgi-bin/mailman/listinfo/arm-allstar
> >
> > Visit the BBB web page - http://www.crompton.com/hamradio/BeagleBoneBlackAllstar/
> >
> _______________________________________________
> 
> arm-allstar mailing list
> arm-allstar at hamvoip.org
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> 
> Visit the BBB web page - http://www.crompton.com/hamradio/BeagleBoneBlackAllstar/
> 
 		 	   		  
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