[arm-allstar] 4x4 keypad for Allstar

[Travis French]

Good Morning Doug,

Steve here had an interesting suggestion below and we were curious as to what you thought. Would it be better to read the DTMF digitally or by injecting it into the audio line with a tone? Is that method also a possibility and maybe less invasive? Is the audio input line monitored at all times? That could be an obstacle.

At first I was thinking about DC blocking and filtering but one would not be keying while talking so maybe only DC blocking would be necessary.

Again, curious of your thoughts and if there was an advantage to one method over the other?

Thank you in advance,

Travis E. French – K2PCB


From: Steve Smith <stevewsmith at chartermi.net>
Sent: Wednesday, September 19, 2018 8:10 PM
To: Travis French <tfrench at pcb.com>
Subject: Re[2]: 4x4 keypad for Allstar

No, I have not tried this with Allstar.  I assume that it is always monitoring when using the SimpleUSB channel driver but I suppose that it might need COS in which case it would not work.  I'm sure Doug has the answer!

Steve

------ Original Message ------
From: "Travis French" <tfrench at pcb.com<mailto:tfrench at pcb.com>>
To: "Steve Smith" <stevewsmith at chartermi.net<mailto:stevewsmith at chartermi.net>>
Sent: 9/19/2018 4:49:38 PM
Subject: RE: 4x4 keypad for Allstar

Good Afternoon Steve,

You know, I like that idea too as it does not involve any software mods. If I recall correctly, it is always monitoring for a DTMF tone. Is this something that you have done already with success?

Thank you in advance,

Travis E. French
PCB Piezotronics<http://www.pcb.com/>
Microelectronics – Production Supervisor I
(716) 684-0002<tel:(716)%20684-0002> ext. 2238
tfrench at pcb.com<mailto:tfrench at pcb.com>


From: Steve Smith <stevewsmith at chartermi.net<mailto:stevewsmith at chartermi.net>>
Sent: Wednesday, September 19, 2018 1:42 PM
To: Travis French <tfrench at pcb.com<mailto:tfrench at pcb.com>>
Subject: 4x4 keypad for Allstar

Hi Travis,

I can not figure out how to reply to the thread on the ArmAllstar list so I am emailing you directly.

With regard to your 4x4 keypad need, you could also use a 4x4 keypad to DTMF encoder and combine the DTMF audio with the audio from your radio at the audio input (mic) of your USB  FOB.  Since you wanted to use the same key sequences with the keypad as you use with your radio, no changes are required to your Allstar setup.

Here is one such encoder  https://www.ebay.com/i/292617376791?chn=ps

Steve - N8AR