Jim, Many years ago when I was servicing radio equipment for Bell Canada, we used a special fuse holder with a very small value fuse on the input connector. That worked well and protected the external pad that we used on the signal generator.
73 John VE3AMZ ----- Original Message ----- From: "James" <[email protected]> To: <[email protected]> Sent: Tuesday, January 05, 2010 5:30 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 > > > > > ------------------------------------ > > > > Yahoo! Groups Links > > >
