Leaderboard

If that LMR-400 cable is brand-new, it will work great for about a year, then it will start playing havoc with your receive signal. The foil and the braid will start to oxidize in some areas, and loosen-up in other areas of the cable, causing white noise to be generated by the feedline itself by the transmitted signal. You will then experience terrible de-sense in your receiver due to the white noise. LMR-400 is great for two-way communications, but only one way at a time. When you are using a coaxial cable in a repeater installation, where it has to send a transmit signal, and still receive at the same time... that's where you run into trouble with LMR series cables, or any other brand of foil-plus-braid cables. RG-213 with full-braid shield and no foil overlay would be better for this application. The BEST solution for a 50 or 75 foot run would be 1/2" Heliax. For longer runs at UHF frequencies, I'd go with 7/8" Heliax or larger for best results. -- As for IDs, Ham station operators and repeaters are required to ID at the beginning of a contact, then end of the contact, and every 10 minutes during an ongoing contact. For GMRS users, it is the same, only 15 minute intervals. GMRS repeaters MAY send an ID using voice or modulated Morse code, (not CW), but are not required to ID at all. However, GMRS USERS must ID themselves using the 15 minute rule, whether using a repeater or not. That's my interpretation of the rules, and I have read them all very carefully.