Re: [Repeater-Builder] Re: Help IDing a circulator
At 10/7/2009 16:39, you wrote: At 07:36 PM 10/6/2009, n...@no6b.com wrote: Are you sure you didn't miss a 3rd trimmer? Every tunable isolator I have has 3 adjustments per stage, one for each port. If not, it's possible the interstage tuning (1st stage output 2nd stage input) are fixed-tuned, which explains the narrow tunability. --Actually there are 4 trimmers (as my original post eluded to). Being a 2 stage isolator (4 ports total), there are two pass ones and 2 reject ones. There should have been 4 pass trimmers total. As I stated in my previous post, my guess is that the interstage tuning is fixed, which would explain the low bandwidth. Bob NO6B
Re: [Repeater-Builder] Re: Help IDing a circulator
At 07:36 PM 10/6/2009, n...@no6b.com wrote: Are you sure you didn't miss a 3rd trimmer? Every tunable isolator I have has 3 adjustments per stage, one for each port. If not, it's possible the interstage tuning (1st stage output 2nd stage input) are fixed-tuned, which explains the narrow tunability. --Actually there are 4 trimmers (as my original post eluded to). Being a 2 stage isolator (4 ports total), there are two pass ones and 2 reject ones. Still a ton of insertion loss regardless on the ham band 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!
[Repeater-Builder] Re: Help IDing a circulator
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 --- In Repeater-Builder@yahoogroups.com, Ken Arck ah...@... wrote: I don't recognize the logo. http://www.ah6le.net/circulator.jpg Obviously it's a 2 stage one and the label says it's a Model CD-460S with tuned-to freq. of 462.975 mHz. I'm after some spec's on the thing. 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!
Re: [Repeater-Builder] Re: Help IDing a circulator
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!
Re: [Repeater-Builder] Re: Help IDing a circulator
At 10/6/2009 15:46, you wrote: ---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) Are you sure you didn't miss a 3rd trimmer? Every tunable isolator I have has 3 adjustments per stage, one for each port. If not, it's possible the interstage tuning (1st stage output 2nd stage input) are fixed-tuned, which explains the narrow tunability. Bob NO6B
