Motorola L3276 Tone Remote and CDM radio

[FMROB]

Ok, So I am ashamed to be asking this question and I am puzzled. Let me start off by saying that I almost always use CPI tone remote adapters. They are great units, have nice audio and I have never had any issues with them. I stopped using the motorola and Gai Tronics adapters, just for ease of setup of the CPI units and the audio quality.

With this being said, I ahave the Motorola L3276 tone remote adapter hooked to a CDM 1250 radio. I have 10 channels programmed in the radio, with all 16 assigned within the zone and have pins 6 - 8 - 12 - 14 programmed for channel steer 1-4 repectively.

The radio seems to skip the channels when changing, it will skip 3, 5, 7 etc. The channels are not chaning in order.

On the factory motorola tone cable I have Red/Black to Pin 6 of the Radio, Orange to Pin 8 of the radio, Black to pin 12 of the radio, and greeen/black to pin 14 of the radio.

Should there be a fifth wire for channel steer 0, I am not using monitor at all, and I have changed around the dipswitch settings for just 16 Freq, 15 + monitor. Nothing seems to work.

PS, the console is set right down the line for normal tone chart.

- Rob

[Bill_G]

Sounds like bit 0 is not changing state. Could be a broken radio, a bad wire, mis-pinned, or the adapter is broken. Can you manually select and unselect that line, and get the radio to move correctly?

[wa6ylb]

Ok, So I am ashamed to be asking this question and I am puzzled. Let me start off by saying that I almost always use CPI tone remote adapters. They are great units, have nice audio and I have never had any issues with them. I stopped using the motorola and Gai Tronics adapters, just for ease of setup of the CPI units and the audio quality.

With this being said, I ahave the Motorola L3276 tone remote adapter hooked to a CDM 1250 radio. I have 10 channels programmed in the radio, with all 16 assigned within the zone and have pins 6 - 8 - 12 - 14 programmed for channel steer 1-4 repectively.

The radio seems to skip the channels when changing, it will skip 3, 5, 7 etc. The channels are not chaning in order.

On the factory motorola tone cable I have Red/Black to Pin 6 of the Radio, Orange to Pin 8 of the radio, Black to pin 12 of the radio, and greeen/black to pin 14 of the radio.

Should there be a fifth wire for channel steer 0, I am not using monitor at all, and I have changed around the dipswitch settings for just 16 Freq, 15 + monitor. Nothing seems to work.

PS, the console is set right down the line for normal tone chart.

- Rob

I agree with Bill_G. The radio uses 4 bit binary code on the 4 select lines, which you have identified. I have several of these adapters in service with no issues. If you’re missing the "odd" channels, then the least significant bit line isn't switching. I just looked at the accessory pins on the CDM CPS and I don't see a Channel select 0 line choice. In any case, the lowest significant bit on the remote adapter goes to Channel select 1, the next to Channel select 2 etc.
It sounds like you have gone over the dip switch settings in the L3276 and have chosen the correct setting for 15 channel + monitor operation (that is what I used too). At this point, I'd go back and make sure the wires are in the correct holes in the 16 pin adapter plug and or make sure you didn't miss a bit setting in the accessory pin programming. It is possible to select the same channel input line on multiple pins.
B.

[FMROB]

Hello all,

After about two hours I gave up. This is in a rack of four other control stations with cdm's and tone adapters for a console.

So to get this straight, do my pins seem correct? Im I correct in saying that I dont need to use the channel steer 0 wire? I just need to use 1, 2 ,3 4.

Thanks, Rob

[Bill_G]

In the past, on other models, they were labeled 0, 1, 2, & 3 if I recall correctly.

[FMROB]

Ok, I will try using lines 0, 1, 2, 3 instead of 1, 2 , 3, 4.

Thanks Bill... You rock.

Im gonna shoot you a message in the near future about a few questions about power dividers and noise floor level testing that we were talking about in a previous thread.

Thanks, Rob

[FMROB]

Can anyone confirm if channel 0,1,2,3 need to be used on this tone remote for 15 F + Monitor? Or should it be channel 1,2,3,4. Thanks, Rob

[d119]

0 is a significant digit, so make sure it's used. Last I did a CDM to tone remote adapter we used 0, 1, 2, 3.

[FMROB]

Otay, I am working on it tomorrow and will report back.

Thanks, Rob

[alex]

I remember some issue from a few years ago doing something similar and we ran in to the problem where you could only use 4 I/O pins on the radio to do channel select. That meant that you had to sacrifice monitor control over the radio. What was done to overcome this was to build a circuit which used the Mic port in the front of the radio to be able to take the mic off hook. You then program the radio when it see's the Mic off hook to go in to Monitor mode.

It's kind of backwards but it did the trick.

The problem is that if you do it using the rear pins you end up needing to sacrifice that list bit pin and can only control (12?) channels not the full 16.

The solution above will get you control over all 16 *AND* monitor.

Not pretty but who is going to look at it.

Alex

(oh, i'd like to credit TPG with this one as we were talking about it back then and that was his suggestion in order to make it all work....)

[FMROB]

Alex,

I don't need monitor at all. I just need this thing to at least change 15 channels, if ot all 16. Will using bit 0, 1, 2, 3 work by connection to the pins of the CDM radio channel steer 1, 2, 3, 4?

Thanks, Rob

[alex]

Yup...

Radio -> TNA/ITA
0->1
1->2
2->3
3->4

That's how it's mapped. Why they won't keep it standard to say 1-1 is beyond me.

You have to keep in mind it's all hex based for how the channel's are done...

Alex

Edit: I'd like to add there was a reason we used CDM1550's for this particular project as I remember seeing somewhere the CDM series was limited to the number of channels you could control from the rear pins. You *should* be ok with doing 16 with the 1250 but there may be some stupid software limitation.

Edit #2: http://www.dvara.org/mototrbo/TRBO_Channel_Steering.pdf Look at this PDF... It's for a Trbo Repeater however you can get an idea how the binary math works out for the channel steering....

[FMROB]

Alex,

Thank you. On my way to set this up. Thanks all.

[FMROB]

This hit the nal on the head. 0 is actually channel steer 1. Works well.

Thanks all for the help..