Tony, The cables used in the HKN9235 Internal Duplexer Cable Kit are not fabricated to meet any technical requirement; they are simply made long enough to fit with only a little slack. The GR1225 desktop repeater uses the same cable kit, which you can purchase for about $40 from Motorola Parts. If your GR300 has the standard factory-supplied mobile notch duplexer, it will have N female connectors. Yes, the GM300 radio, just like the R1225 radio, has mini-UHF connectors.
But wait! If you plan to make up your own cables, use only double-shielded RG-400/U cable, and install the correct plug on each end- no adapters. I had a brand-new GR-1225 VHF desktop repeater on my bench that had some serious desense- more than 2 dB- and I traced the problem to the plain-Jane RG-58/U coaxial cable used in the HKN9235 cable kit. RG-58/U coax is just too leaky to be used for duplexer jumper cables. I made up new cables with silver-plated connectors and RG-400/U cable, and the desense went away. 73, Eric Lemmon WB6FLY -----Original Message----- From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of Tony L. Sent: Monday, February 11, 2008 12:33 PM To: [email protected] Subject: [Repeater-Builder] Motorola GR300 Housing - RF Cables used Fellow Repeater Builders: Does anyone know the length of the RF cables used in the GR300 repeater housing? I'm expecting to take delivery of a used unit shortly, but want to order a new set of cables in advance of delivery. I need the following cable lengths. Thanks. 1) Tx radio to internal duplexer 2) Rx radio to internal duplexer I believe the radio cable ends will need a mini UHF male, will the duplexer cable ends need a N-males, UHF males, or BNC males? I also want to order a cable from duplexer to antenna bulkhead. Thanks. Tony
