Re: Kenwood TM-271A > 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.
3rd order problems from other mountaintops? How many, how far away and how did you know/measure/confirm it was a 3rd order problem? The DCI filter is only "ok" for use in a casual application. It's not narrow by any means nor should it to be trusted to help a receiver at a very busy location. Also depends on which dci filter you have and how it's installed. The typical DCI 2 meter band filter is a pretty wide beast. It's not going to help as well (on a busy radio site) as most people would expect/hope. > 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. I'm not sure if I'd blame the IF section for the trouble unless I did a lot of testing. > 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 So what did replace the radio with and how well does it work? What type of filtering and pads did you put in front of the replacement radio? cheers, skipp
