Motorola GM300 cross band repeater

I’ve been playing around with old Motorola commercial gear on the amateur bands, and decided to try a cross band repeater. This setup is using 1/each of the VHF and UHF versions. For ID and repeater control, I built an ID-O-Matic IV by The duplexer is a MFJ916B. Antenna is a TRAM-1480 @ 35′ AGL.
Photo & Video Sharing by SmugMug
Other images of this repeater setup can be found at: mainelife images

1 thought on “Motorola GM300 cross band repeater

  1. Jason Moore


    I’m very interested in doing this myself.

    How’s this project progressing? Did you need to modify either radio at all?



Leave a Reply

Your email address will not be published. Required fields are marked *