Blew them out left and right when I was getting started in the business. There was a calibrated isolator that someone sold to replace the 40dB pad on the Cushman. Would handle 50 watts(?) for short periods.
WalterH --- In Repeater-Builder@yahoogroups.com, Eric Lowell <elowell9...@...> wrote: > > Cushmans used low value fuses for years. >  Eric Lowell > Eastern Maine Electronics Inc. > 48 Loon Road > Wesley ME 04686 > eme....@... > www.satnetmaine.com > 207-210-7469 > > > > > ________________________________ > From: James <ka2...@...> > To: Repeater-Builder@yahoogroups.com > Sent: Tue, January 5, 2010 5:30:00 PM > Subject: [Repeater-Builder] Service Monitor Input Protection > >  > Hello to the group. Knowing most of you have service monitors for the > Repeater Builder Hobby, I wanted to pose the following question. What method > do you use to protect the input of your service monitor from excessive RF > Power input? I am referring to the input/output jack that is limited to 2.5 > watts on MANY service monitors. I know I can use an attenuator, but that gets > removed for sensitivity checks and may not get put back on. One suggestion is > a RF Relay that would trip on say one watt and put the power to a dummy load. > The problem is I have used one of the cheap circuits in the past and toasted > transistors in a Pre-amp, before the relay reacted as the book said it > should. However I know there are circuits in say the Mirage Amp that also has > a Pre-Amp that is removed from the antenna during transmit, that works well. > What are you doing to protect your monitor? Appreciate your thoughts. > > 73 JIM KA2AJH >
