Re: [Repeater-Builder] 2M duplexer question

John, I used CommShop to come up with the minimum required duplexer isolation for a 2m transmitter putting out 50 watts, and a receiver of 0.35 uV sensitivity 600 kHz away. The answer was 87.2 dB. Bear in mind that computer programs like CommShop that calculate duplexer isolation have to make

Re: [Repeater-Builder] 2M duplexer question

For amateur radio, TX/RX gives 25% off their list price. I find that their four cavity unit is about 88-93 dB. James johnmichaelwelton wrote: Need to get several 2M duplexers for a hospital project. The Telewave TPRD1454 (4 cavity, 5 in) provide 77dB isolation (~$750). I'll be using 40-50

[Repeater-Builder] 2M duplexer question

Need to get several 2M duplexers for a hospital project. The Telewave TPRD1454 (4 cavity, 5 in) provide 77dB isolation (~$750). I'll be using 40-50 watt Mitrek's into DB220 or DB224 antennas. Is the 77dB going to be a headache = should I spend an extra 1.5 to 2K per duplexer for better