In case George doesn't have anything written up for parallel port operation:
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
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!
···
--- Original Message ---
On Saturday, February 8, 2014, George Csahanin <george@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.
I already know how to build a simple transistor switch....
How do you set up Asterisk to use the parallel port? What commands where?
73
Jim W7RY
···
On 2/8/2014 1:34 PM, K&R Yoksh wrote:
Hello Andrew,
In case George doesn't have anything written up for parallel port operation: K0kn Web Page
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@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.
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
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Yeah, like that. As I told one other I didn't scratch anything on paper but user ' a pinch of this and a bit of that', etc
Built it all into the shell of the DB25 connector
Works REAL well.
GeorgeC
···
-----Original Message----- From: K&R Yoksh
Sent: Saturday, February 08, 2014 3:34 PM
To: app_rpt
Subject: [App_rpt-users] Allstar parallel port (was source of USB CM108 FOBs- CHEAP)
Hello Andrew,
In case George doesn't have anything written up for parallel port operation:
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@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.