[App_rpt-users] usbfobs

mike at midnighteng.com mike at midnighteng.com
Tue Jul 5 22:38:14 EDT 2016


If you look at this close, it is just a glorified op-amp.
We used a 741 for dsp on a serial line in the 90's.

What makes it tough is the I/O lines some use for PTT/COS.
and the address lines for them that may not be the same with other units.
Could just change the source code for some others.

I suggest finding a way to replace the I/O lines with something else
because ANY dsp should work fine for the audio.
I think the PI itself has them. Just have to write the code to replace it
OR use "ON-EVENT" programming to read/write to them to follow ptt/cos.

I know that is easy for me to say as I'm using Atom boards with a parallel port.
And there are plenty of I/O / DAQ boards out there that can be utilized for plenty
of I/O if the PI's I/O can't work for it.

Just remember, it was the work of others that made it so easy so far.
But a good thing never lasts forever.

...mike/kb8jnm


> drivers?  hardware?  integration with existing codebase?  takes time and (unpaid)
> effort.
>
> --
> Bryan
> Sent from my iPhone 6S...No electrons were harmed in the sending of this message.
>
>
>
>> On Jul 5, 2016, at 20:54, Steven Donegan <donegan at donegan.org> wrote:
>>
>> I would ask a different question - why do we still use slow USB devices rather
>> than ones directly attached to the Pi's bus?
>>
>> Steven Donegan
>> KK6IVC General Class FCC License
>> FAA PP-ASEL Pilots License
>> Silver State Car #86
>> www.sscc.us
>>
>>
>> From: David McGough <kb4fxc at inttek.net>
>> To: app_rpt mailing list <app_rpt-users at ohnosec.org>
>> Sent: Tuesday, July 5, 2016 5:40 PM
>> Subject: Re: [App_rpt-users] usbfobs
>>
>>
>> Steve,
>>
>> The CM108/CM119 is nowhere near dead! Even if CM stops manufacture, there
>> will be decent "clones" of it for years to come. No worries about that!
>>
>> If you're needing some FOBs, I understand the shipping issues you've got,
>> being in NZ. I just checked the US Postal Service shipping site and a
>> "First Class Mail International Large Envelope" is under $20USD for 2
>> lbs., shipped from the USA to NZ.  Priority mail, where you could ship a
>> small box in under a week, starts at about $64USD.  See:
>>
>> https://ircalc.usps.com/?country=10324
>>
>>
>> Why not just work a "bulk quantity" deal with Kevin or Scott to sell you
>> and ship you a hand full of their RIM-lite adapters???  Then, you'll in
>> good shape for now.
>>
>> http://www.repeater-builder.com/products/usb-rim-lite.html
>>
>>
>> 73, David KB4FXC
>>
>>
>> On Wed, 6 Jul 2016, Steve Wright wrote:
>>
>> > On 06/07/16 11:44, Kevin Custer wrote:
>> > > Soldering a 48 pin LQFP and having it be fake is nothing short of a
>> > > bad experience.  Like Scott, I recently purchased a fair quantity of
>> > > CM119A's from a top CM distributor.  They told us the CM119 and CM119A
>> > > are now legacy products and the CM119B is current. Unfortunately, the
>> > > B model doesn't use a crystal and several developers agree that they
>> > > may not be suitable for digital and analog radio adapter
>> > > applications.  There were still a few hundred CM119A's in the
>> > > distribution chain as of a few months ago.
>> >
>> > If the CM119 is dead, then we should scrap it.  I can't really see why
>> > we are focussing on that devices' built-in I/O, when we have computing
>> > devices such as RPI3 with scads of easily accessible I/O.
>> >
>> > Linux sound is really well developed - "just works everywhere" I'd say.
>> > Why not build or reuse a DSP-based driver for that, that will handle
>> > voting - now we are in business with all the toys, for the foreseeable
>> > future.  Likely a simple CLI config tool could be developed too - choose
>> > RX audio device, TX audio device, signalling, save settings, done.
>> > Rinse and repeat for three devices.
>> >
>> > Hardware VOTERs are fine for a single repeater with a few outboard
>> > receivers, but way too much money for non-millionaire clubs to convert
>> > "everything" to asterisk - they will stick with their IRLP node for
>> > sure, and that is a tragedy..  I see a few members here and elsewhere
>> > make it their business to put tens of thousands of $$ into communication
>> > systems, and that's enviable and laudable, but 90% of constructors don't
>> > exist on that rarefied plane.
>> >
>> >
>> > S
>> >
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