Re: [Repeater-Builder] Looking for Microwave Associates 7R011T Isolator Tuning Procedure

[Micheal Salem]

Skip: I did look it up when I got home in my ancient M/A-COM catalog (From 1982, no less.  It is hard to throw this stuff away). For those who are interested, the 7R011 is specified at 125 watts.  The insertion loss is .9 db typical with 1.3 db max.  The isolation can be as high as 60 db with 50 db typical.  That may require breaking out the HP435B and an RF head to tune it.  But I could get a good null right down to zero indication at 10 watts in and a 1 watt Bird element on the output and  expected that I had at least 40 db or more of isolation.  It is described as a metro style isolator. The 44004 load that comes with the typical IM panel that includes the 7R011 is rated at 100 watts and I would agree with Skipp that it would not be a good idea to dump more than 100 watts through the device.  With 125 watts in and an insertion loss of .9 db. there probably isn't more than 100 watts in the dummy load, but you could be dissipating a lot of power in heat in the isolator in an open antenna condition. Micheal Salem N5MS Norman, Oklahoma skipp025 wrote: I would have to look it up, but I think that this isolator takes up to at least 100 watts. That would be when it is in resonance. I have run 65 watts through it with not much trouble. Micheal Salem The port loads are under sized if you want real protection. The units operate just fine at 100 watts fwd power... at least that's what Motorola had been blowing through them for some decades. As long as the antenna system works as it should, the loads are probably ok for lower power levels. But I wouldn't trust the supplied port loads as a failsafe. skipp 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 the Yahoo! Terms of Service.