NECW4
Member
Is it possible to hook up a gm300 to a Motorola comtegra without a to e remote? Thanks
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Motorola dispatch console
- Thread starter NECW4
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SteveC0625
Order of the Golden Dino since 1972
How far apart will the radio and the console be?
Does the GM300 have the 5 pin or 16 pin accessory port? (16 pin is probably required.)
Do you have any documentation on the console?
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NECW4
Member
The radio would be like 5 feet from console. The gm300 has 16 pin and yes I have the manual for the console. How can I do this. Thanks
SteveC0625
Order of the Golden Dino since 1972
Well, you first have to figure out what the pin-outs are for the console and whether or not it can provide the different inputs that the radio needs to see.
If the console is DC remote only or tone remote only, then it won't mate up directly with the radio. However, what little info I could find on the Comtegra on the internet tells me that it can be directly connected to a base station radio. That suggests to me that it is possible and likely that you can mate up the two.
You have the manual there, I don't so it's kind of tough to figure out what the Comtegra is all about from here.
You also need to be able to program the radio's accessory pins to do this. FWIW, there is quite a lot of info about the GM300 family of radios at batlabs.com which should help you out.
Edit to add: If you have the manual in a digital format and are willing to send me a copy, I may be able to give you some better help.
NECW4
Member
Ok guys you have been alot of help so far. I guess i don't have the manual. It was the programing manual i have. On the back of the console it has two green ports with 4 small ports in them. i think they are labeled as line 1 and line 2. So i guess i have 4 pins to chose from.... i looked at a gm300 pin out and from what i think i would need is ppt,rx audio out, mic audio in and maybe ground? And would those have to go in a certain order in back of the console? and lastly what would i have to change in the gm300 programing... Thanks
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RKG
Member
My guess is that your console is designed to work with EIA tone signalling. (What you'd need for a direct connection to a mobile radio is what we call "E & M" signalling, which involves 4 pairs: Tx, Rx, PTT and COR (though most folks find using a VOX function to be more reliable that relying on a mobile radio to trigger a COR signal).)
In the absence of a channel card with E & M capability, your best bet is to get a tone interface module. This connects between the console channel card and the mobile radio; it takes EIA signalling from the channel card and translate it into E & M electrical signals for connection to the mobile, and vice versa. Tone control signalling comes in two flavors: 4-wire systems separate the Tx and Rx lines to and from the console, while 2-wire systems use the same pair for semi-duplex operation in both directions. You only need a 4-wire connection for full duplex operation, which by definition isn't available on a mobile radio used as a control station. So opt for a 2-wire set-up.
In the absence of a channel card with E & M capability, your best bet is to get a tone interface module. This connects between the console channel card and the mobile radio; it takes EIA signalling from the channel card and translate it into E & M electrical signals for connection to the mobile, and vice versa. Tone control signalling comes in two flavors: 4-wire systems separate the Tx and Rx lines to and from the console, while 2-wire systems use the same pair for semi-duplex operation in both directions. You only need a 4-wire connection for full duplex operation, which by definition isn't available on a mobile radio used as a control station. So opt for a 2-wire set-up.
NECW4
Member
Ok so back to my original question... I am not able to go directly to the console? I need a tone remote?
SteveC0625
Order of the Golden Dino since 1972
Absent the manual, or at least firm documentation on the console's pin-outs, all any of us can do is guess.
As I said previously, Batlabs makes a brief reference to the Comtegra stating that it can be connected directly to a base station radio. That suggests to me that tone remotes, dc remotes, E&M remotes may not be necessary.
However, without knowing how the console is supposed to be connected to a radio, it's all speculation.
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