[arm-allstar] Success with Remote Base Channel Steering (Motorola CDM1250/RB USB-RIM-Lite)

[Scott Zimmerman]

 > Scott has made great hardware...
Thanks for the kind words guys. It's always nice to get feedback that a product is working as intended. ;)

Scott

Scott Zimmerman
Amateur Radio Call N3XCC
474 Barnett Road
Boswell, PA 15531

On 4/8/2018 5:48 PM, "Lloyd Duck via arm-allstar" wrote:
> Randy,
> 
> Glad you had the same success I did. Scott has made great hardware and Doug did a great job on the software!
> 
> 
> On Apr 8, 2018, at 4:02 PM, Randy Neals via arm-allstar <arm-allstar at hamvoip.org> wrote:
> 
> A quick note to report good success with Remote Base Channel Steering.
> I have used a Motorola CDM1250 VHF radio, appropriately programmed with 3
> channel selection lines on the 20 pin option connector.
> 
> The Channel Steering how-to-note on the HamVOIP page was super helpful, and
> I now have a VHF remote base with 7 steerable channels. (1-7 on the radio)
> 
> The key to making this easy was the Repeater Builder USB-RIM Lite "Maxtrac"
> edition and the Motorola CDM series radio. Plug and play.
> http://www.repeater-builder.com/products/usb-rim-lite.html
> 
> The USB-RIM Lite (Maxtrac) has GPIO 5,6,7,8 connected via buffer
> transistors to pins 6, 8, 14 and 12 on the 20 pin option connector on the
> CDM1250.  (16 pins on a maxtrac)
> I'm using one line for COS, and 3 lines for radio channel steering.
> 
> The CDM1250 uses BCD (binary code decimal) control lines for channel
> steering.
> The AllAtar channel steering script translates DTMF input to specific bit
> pattern on the GPIO and radio control lines.
> 
> Following the example, I've configured the function stanza using 83x
> So if I want channel 1, I send DTMF *831, channel 7 is *837 etc.
> 
> If you have ever considered a remote base on your repeater, or even an
> Internet remote base - This is a slick and easy way to implement.
> 
> Why am I using a CDM1250 instead of a Maxtrac?
> The CDM series radios have a varactor tune receiver front end. As you
> change frequencies, the selective front-end retunes its narrow passband for
> the frequency you are operating on. The Maxtrac series have a fixed tuned
> wide front end nominally 24 MHz wide. I've found the CDM series to be a
> more selective receiver, less susceptible to interference.
> 
> 73
> Randy
> W3RWN
> Seattle
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