At 03:08 PM 10/6/2009, rfburnz wrote: > > >RJ Communications made these, a small Phoenix company (of the three >companies that made ferrite circulators in Phoenix: RJ, Celwave and >EMR, RJ is the most obscure, and I believe they are no longer in business. >The RJ design is identical to Celwave circulators. The one pictured >is a non-tunable dual section design and it will likely fall off >considerably in performance in the 440MHz range. Some will say you >can mess with them and re-bias the magnets to move the freq but I >would recommend finding the right part that was intended to be used >at the freq range it was intended for because a dual section >circulator used out of band will have considerable losses. >W 6MTF
<---Thanks for the info! And while the one I have IS tunable (each stage has a Johanson type trimmer for the pass and one for the load port), it is exhibiting in excess of 2.5 dB insertion loss when "properly" tuned (in the ham band of course). Damn nice unit......too bad Ken ------------------------------------------------------------------------------ President and CTO - Arcom Communications Makers of repeater controllers and accessories. http://www.arcomcontrollers.com/ Authorized Dealers for Kenwood and Telewave and we offer complete repeater packages! AH6LE/R - IRLP Node 3000 http://www.irlp.net "We don't just make 'em. We use 'em!"
