At 3/4/2007 04:14, you wrote: >Not a 271 but did use a TM-241 when the receiver failed on a local 2 meter >repeater. Simply placed one of the "garbage can" size filters on the >input. Absolutely no intermod and better sensitivity than the normal >MASTR II that had failed. > >At the same site I also use a TM-241 as a remote base controlled by an >FC-1 with no problems. On the remote I have a notch filter tuned to the >frequency of a 1/3 KW transmitter in the 152 MHz range. > >There are 28 transmitters at the site and within 300 yards there are >another 30 transmitters on another tower. > >Bottom-line is they can be made to work in high RF environments but a >receiver with good front-end filtering will work without the need for >additional filtering.
No, they can't. I had to try to make one work at a comm. site on a 5,200 ft. mountaintop. Had a DCI bandpass filter AND a 10 dB pad in front of it (the TX & RX were separated internally), but we still got lots of 3rd order IMD from sources on OTHER mountaintops. Also had problems with the IF filtering, causing the squelch to close on reasonably strong signals when a strong signal 15 kHz away was present. In short, one of the poorest receivers I've ever worked with. TX was OK though, just throw a fan on the heat sink. Bob NO6B
