[arm-allstar] Setting Up Motorola CDM-1250 for Allstar

[Larry Mollica]

I agree with Michael about active low for exactly the same reason. If you use active high it will send spurious PTT to the network if the radio is off or the interface cable is  unplugged.

And again, you can use the flat input if you want but as that input bypasses the limiter stage, there is no limiting going on that I know of unless you cook up some sort of external limiter. Just FYI.

Larry


On Jan 24, 2022, at 1:38 PM, ve3rwj via ARM-allstar arm-allstar-at-hamvoip.org |HamVOIP| <7i5yut7hp95q5rt at sneakemail.com> wrote:

> Hmm, ok if that's a good idea, I need to quickly tell the guy I’m buying the radio from... he's programming it for me.
> 
> Anyone else have thoughts on this?
> 
> 
> -----Original Message-----
> From: ARM-allstar <arm-allstar-bounces at hamvoip.org> On Behalf Of "Michael Webb via ARM-allstar"
> Sent: January 24, 2022 4:14 PM
> To: ARM Allstar <arm-allstar at hamvoip.org>
> Cc: Michael Webb <mike.wg5eek at gmail.com>
> Subject: Re: [arm-allstar] Setting Up Motorola CDM-1250 for Allstar
> 
> Personally I run my Motorola Maxtrac and others with pin 8 as low, then invert the PTT so that when the radio is off, it's not making asterisk think it needs to be keyed and thus not locking up any Nodes you may be connected to.
> 
> On Mon, Jan 24, 2022, 11:54 AM "Chris via ARM-allstar" < arm-allstar at hamvoip.org> wrote:
> 
>> Re. my post yesterday regarding CDM-1250, Maxtrac interface, PI 
>> running
>> Hamvoip:
>> 
>> 
>> 
>> Apparently the settings you need are as follows:
>> 
>> (Please advise if any of these are incorrect or if I need to add 
>> anything else. I’ll be forwarding these to the guy selling me a used 
>> radio.)
>> 
>> 
>> 
>> 1.      On the Radio configuration tab, Accessory Pins tab:
>> 
>> A. Set Pin 3 to “DataPTT” (input), “Low”.
>> 
>> B. Set Pin 8 to “PL” and “CSQ Detect”…  Set active level to “High”.
>> 
>> 
>> 
>> 2.      On the Accessory Configuration tab:
>> 
>> A.      Set Rx Audio Type to “Flat Audio”,
>> B.      Set Data PTT Audio Source to “Flat Tx Audio”
>> 
>> 
>> 
>> 3.      On the Conventional Personality tab:
>> 
>> A.      Set your preferred alias and channel bandwidth to “25 KHz”.
>> B.      Set TX and RX frequency to: (I’m using 446.140 MHz)
>> C.      Set TX and RX PL to “CSQ”, frequency: 100 Hz (or whichever PL you
>> want).
>> 
>> 
>> 
>> 4.      On the Options Tab
>> 
>> A.      Time Out: 5 minutes or similar.
>> B.      Low Power TX: whatever the lowest available setting is… 20 W?
>> 
>> 
>> 
>> 5.      Advanced Tab: Set Emphasis to “NONE”.
>> 
>> 
>> 
>> It might be a good idea to program in a couple channels near your 
>> frequency specified above, in case someone complains and asks you to 
>> move your node elsewhere, so I’m going to add 446.125 MHz and 446.155 
>> MHz
>> 
>> The above settings were found at a link Patrick, N2DYI sent along. 
>> Thanks Patrick!
>> 
>> 
>> https://www.parkerradio.org/community/projects/allstar-node-from-motor
>> ola-cdm-1250-radio/
>> 
>> 
>> 
>> 73
>> 
>> 
>> 
>> Chris
>> 
>> 
>> 
>> _______________________________________________
>> 
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>> 
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