[App_rpt-users] USB FOB not affecting Pin 13 to PTT

Scott Zimmerman n3xcc at repeater-builder.com
Sat Nov 26 18:47:56 EST 2016


For this weekend only, I am running a Black Friday / Cyber Monday discount of 10% on all Repeater-Builder products. Items 
MUST be ordered before midnight Tuesday to receive the discount.

Scott

Scott Zimmerman
Amateur Radio Call N3XCC
474 Barnett Road
Boswell, PA 15531

On 11/24/2016 8:36 PM, Kevin Custer wrote:
> Jim,
>
> For something requiring small packaging, consider the RIM Lite models from Scott Zimmerman:
>
> http://www.repeater-builder.com/products/usb-rim-lite.html
>
> Kevin
>
>
>
> On 11/24/2016 6:10 PM, no1pc at yahoo.com wrote:
>> Thanks Kevin!  Your work is legendary and has always been uniquely valuable to the community!
>>
>> The 'DSP' schematics implied Pin 13 went to 'a' red LED without enough clarity for my brain to get this was an add-on/mod.
>> (read the whole manual Jim!)
>>
>> Your board is the next stop on the trail!!
>>
>> This is for my a shielded/re-packaged BF-888 porta-node to go in the RV and the next will be tied to an RLC controller for
>> our 'landmark' SF repeater site.
>>
>>
>> -----------------------------------------------------------------------------------------------------------------------------
>> *From:* Kevin Custer <kuggie at kuggie.com>
>> *To:* no1pc at yahoo.com; "App_rpt-users at ohnosec.org" <App_rpt-users at ohnosec.org>
>> *Sent:* Thursday, November 24, 2016 2:11 PM
>> *Subject:* Re: [App_rpt-users] USB FOB not affecting Pin 13 to PTT
>>
>> You are missing something....   On most FOB's, regardless of the manufacturer, the RED LED is not wired to pin 13.  While
>> the green LED usually works correctly because it's tied to pin 12 on the C-Media chip, the red LED by default is connected
>> to pin 21.
>>
>> There are several reliable sources for non potted FOB's, but generally they cost more.  The SYBA UAUD71 and the StarTech
>> ICUSBAUDIO are two such units.  They generally cost between $11 and $17 depending on supplier.
>>
>> I've recently dropped the price of the RA-35 to include the CM119A and EEPROM to be presoldered.
>> http://www.masterscommunications.com/products/radio-adapter/ra35.html
>>
>> Kevin
>>
>>
>>
>> On 11/24/2016 3:20 PM, no1pc at yahoo.com <mailto:no1pc at yahoo.com> wrote:
>>>
>>> I have a few USB fobs resembling the one shown in the document titled "USB FOB to DB25 Interface"
>>>
>>> Unfortunately the chip itself is potted die-on-board so access to signalling lines is limited to the additional components
>>> on board, which should seem simple enough to get to Pin 13 that feeds the Red LED to extract a PTT signal.
>>>
>>> (I am able to assert COS- to Volume down and get received audio "to the net" experienced with WebTransceiver.)
>>>
>>> Unfortunately metering 'every' available connection and toggling WebTransceiver's Key/Transmit, none of the signal lines
>>> on the board react.  I could imagine one line or the other might be open-collector and I'd have to add a pull-up to see a
>>> transition, but with the LED still in-circuit I'd think that would react.  (The Green LED works as heartbeat just fine.)
>>>
>>> Before I head to the local Frys and buy 1-2 each every fob they have to gut to see if I could get to the chip pins
>>> directly (or try to be patient and wait for Amazon)...
>>>
>>> ... I'm sitting here looking at a fully functional micro with a LOT of GPIO pins available...  wondering why, aside from
>>> the IRLP s/w and interface options available... doesn't an AllStar implementation leverage the on-board signalling?
>>>
>>> I see there is Python code around to work with the GPIO, but not quite yet sure how or if I could create and call PTT and
>>> COR (and CTCSS) sense scripts within the AllStar configuration - ???
>>>
>>> I know it would split out the radio audio v PTT/COS wiring harness just a bit vs the cute USB thing, but what the heck -
>>> buffer/interface parts on a small perf board tied to the GPIO pins and done?  No?
>>>
>>> Am I missing something?  Code- and instructions-to-be?
>>>
>>> Using Pi 3 Model B v 1.2
>>>
>>> BTW, uname -a yields: "Linux barf3 3.18.0-trunk-rpi2 #1 SMP PREEMPT Debian 3.18.5-1~exp1.co1 (2015-02-02) armv7l GNU/Linux"
>>>
>>>
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>>
>>
>
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