At 7/10/2008 19:59, you wrote: >Be aware that a ferrite isolator or circulator that was originally made for >operation on, say, 152.250 MHz will probably not be tunable down to the 2m >band. Even though the catalog description may say 146-174 MHz, in fact the >typical ferrite isolator or circulator must be remanufactured to operate >properly more than 3 or 4 MHz away from the original tuning. The "146-174
Seems like this thread came up a couple of years ago. Just like then, I'm going to once again disagree with the above statement. Why? Because I have several VHF circulators originally tuned to 152 MHz & they tuned down to 146 MHz with no problem. It's true that a circulator made for 160+ MHz probably won't tune all the way down to 2 meters, but moving only 5 MHz or so from the original frequency isn't going to be a problem in most cases. Bob NO6B
