[App_rpt-users] Allstar parallel port (was source of USB CM108 FOBs - CHEAP)

[K&R Yoksh]

Hello Andrew,

In case George doesn't have anything written up for parallel port operation:
http://www.qsl.net/k0kn/plri.html

There are several circuits detailed here, from the simplest discrete 
transistor type, to a transistor IC type that can support multiple radios.

You can also use an off-the-shelf IRLP board, should you have one laying 
around. The DTMF decoder is not supported by Asterisk (Asterisk uses DSP 
techniques to decode DTMF), so I dropped the MT8870 from my schematics.

At it's simplest, all you'd really need is one NPN transistor for PTT 
(active high from parallel port, active low to activate PTT), and one PNP 
transistor for COS (if active high from radio). If your radio uses active 
low COS, I'd buffer with two transistors (PNP to NPN), rather than directly 
connecting the radio to the PC.

I'd suggest using active low at the parallel port inputs.

73 and good luck.

Kyle
K0KN
Allstar 2210-2219


--- Original Message ---

Hello George,

Do you have it documented anywhere how you configure the parallel port for
COR and PTT? I'd love to see how you have it configured?

Thanks!

On Saturday, February 8, 2014, George Csahanin <george at dyb.com> wrote:

>   I bought some CM108 fobs on EBAY for $0.99 each. He has a s***load of
> them. Not knowing if they'd be real CM108 I waited till I got them to send
> this note. The USB ID is 08dc:000c the real thing.
>
> The last four nodes I built up use D945 motherboards which have parallel
> ports, which I use for COS/PTT and the USB fob only does audio. No need to
> modify them for PTT and COS, etc.
>
> Anyhow, the EBAY auction is 300503465055 OR click this 
> link<http://www.ebay.com/itm/300503465055?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649>
>
> Seller's store is circle607. They're in Hong Kong. But the postage was
> under $1.20 for all ten.
>
> I stocked up simply because they work so well, cost so little, and not
> sure when they will stop being available. (hoarding 101)
>
> GeorgeC
> W2DB
> Allstar 2360