This adapter will even work with the Motorola CDM-750 VHF radio even though this radio has a 20 pin accessory connector on the rear, the inner 16 pins are the same as the GM300. Just make sure you have it plugged it correctly.... with the radio upside-down, the GM300 mini-Din Adapter will be facing up as you are looking at the bottom of the radio. when you turn the radio right-side-up. the adapter will be upside down and you should be looking at the bottom side of the circuit board. Just like it is pictured on this website.

https://www.argentdata.com/catalog/product_info.php?products-
_id=169

When using it with the CDM-750 radio you should be able to see pins 17 & 18 on one side of the adapter and pins 19 & 20 on the other side.

Talk about plug-and-play, did not have to make any adjustments the the GM300 Mini-Din adapter or to my OT-USB. Even works without any adjustments when using the CDM-750 with my MFJ-1278B TNC.

Great job!!!!

Edward Taylor, ka4vmp
Fishersville, Virginia
http://aprs.fi/#!call=a%2FKA4VMP-10&timerange=3600&a-
mp;tail=3600

Rating: [5 of 5 Stars!]