/\/\ GM300 help

[MNRotrMedic]

Hi all, i have a Moto GM300 that i'm finally getting around to installing in my personal vehicle. So far everything looks great.

My issue is that the unit i have will transmit and recieve just fine but the audio coking out of the speaker on the face of the radio is pathetically low. In a mobile environment there is no way that i will be able to hear it. Even turned to max volume there's barely a whisper.

The model number is:
M43GMC29C2AA

It has the 16 pin accessory port on the back with jumpers between pins 7 & 9 and 15 & 16. I assume from some other reading that i need to tap a pair of these accessory pins to put in an external speaker (which would be my preference anyway). I have tried connecting a Radio Shack Extension Speaker (cat no. 21-549) and after removing the 1/8" mono tip and connecting them to various pins on the the accessory slot i still wasn't able to hear anything.

Any help would be appreciated!

Matt

 

[fineshot1]

The usual 4 ohm motorola speaker is the prefered speaker to use.

GM300 Info below
http://www.batlabs.com/gm300.html

Accessory Connector Wiring
http://www.batlabs.com/images/gmacc16.gif

You need to get the accessory plug(if you do not have one)
and wire the external speaker to pins 1 & 16 and sever the
wire between pins 15 & 16. The accessory plug kit comes
with extra wires with pins already attached to one end and
makes it easy to do the job. Just make sure you put the pins
in the correct slots because without the removal tool its almost
impossible to get them out.

 

[gatekeep]

As was suggested by fineshot1, remove the jumper for 15 and 16, and connect your external speaker to 1 (negative) and 16 (positive).

Not sure, but if that is a 16 channel radio you'd need to check the RSS to see what pin 9 is programmed to as it is programmable...it is being jumpered to pin 7 (ground).

 

[ab3ai]

From my experience the jumper between 7 & 9 is for a MaxTrac. On some models you need that jumper in there to select channels. I know by experience The folks at our super radio shop install that jumper on all Motorola radios that go out. It doesn't hurt anything.

 

[gatekeep]

His radio is a GM300 not a MaxTrac.

9 and 7 on the MaxTrac jumps emergancy alarm (pin 9) to ground (pin 7).

 

[MNRotrMedic]

Thanks to all for replies. i will try again tomorrow and post my results

Matt

 

[Astro25]

I had a customer's MaxTrac come into my shop with the same problem almost a year ago. [MaxTracs and GM300s operate basically the same] It's been a while since I touched GM300 RSS, but make sure that the option isn't turned on that only allows radio traffic to pass thru the front speaker if the mic is "on hook" (grounded). It will produce the same symptoms you're speaking of.

Astro25