I am Getting only 83 db Isolation usning My 641's.. funny thing. I cannot get it to work with my MastrII repeater. But it works great with the Spectrum..
Kevin Custer wrote: >I own several sets of Wacom 641's, so I'll correct Eric's figures. The >Wacom 641 is a 4 cavity BpBr duplexer using 8 inch cans. > >Eric Lemmon wrote: > > > >>A 2m repeater on 147.090/147.690, with a 50 watt transmitter and a 0.35 uV >>receiver generally requires about 88 dB of isolation for no desense. The >>WP-641 duplexer is rated at 85 dB, >> >> >> > >While the WP-641 is rated at 85 dB, that spec is at the highband >literature standard of 500 kiloHertz separation, not 600 kc as >referenced above, when used on a 2 meter repeater. > > > >>but most can manage only 80-83 dB. >> >> >> > >Incorrect, Wacom specified the WP-641 at 90 dB isolation at 600 kc, but >they will actually manage 93 dB with careful tuning. >93 dB will allow a 100 watt 2 meter repeater to properly work using a >.35 uV (-116 dBm) receiver. A *good* repeater like a Micor or Mastr II >(read less than typical transmitter side band noise) will allow a 100 >watt repeater operate properly with a factory preamp (-125 dBm) >receiver. Granted, this is its limit, but that isn't too bad considering. > >A Tube Type amplifier (GE 4EF5A1) or PLL exciter and solid state PA will >allow about 250 watts to be duplexed using the Wacom WP-641. > >These specifications can be backed up from the factory literature >available here: >http://www.repeater-builder.com/pdf/wp641.pdf > >Maybe Eric was thinking of the WP-639 duplexer that uses 4, 5 inch >cans? His figures would be much closer.... > >Kevin Custer > > > > > > > >Yahoo! Groups Links > > > > > > > > Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
