Wow! Thanks for the tip. I changed out that FET and the sensitivity is back to normal. I went to Radio Shack and used an MPF-102.
Now the question: Do I put it back at the site with the Radio Shack device? (I'm not sure who makes their transistors) Or do I order something better? Thanks again! Adam N2ACF DCFluX wrote: > Replace the FET that is in the helical casting. on the RF Pre-selector > board. It is a 2N4416, Radioshack carries the MPF-102 as a readily > available substitution. I'd use a J-310 if you have one. > > See: > http://www.repeater-builder.com/ge/lbi-library/lbi-4991g.pdf > > On Fri, Jun 19, 2009 at 11:27 AM, Adam Feuer<[email protected]> wrote: > >> Hello All >> >> I've had a MastrII low band receiver (29.540) on the air for close to 10 >> years now with no issues. It's been very sensitive and breaks squelch at >> around .17uv. >> >> Recently, after a lightening storm, the receiver went deaf. I went to >> the site thinking that the antenna might have got struck by lightening >> but it turns out that the receiver now breaks squelch and around 8uv. >> (or whatever is in between the 5 and 10uv setting on my IFR1200S) The >> antenna checks out fine. >> >> Having only tuned these receivers up and never having to trouble shoot a >> failure, I'm wondering if anyone knows of a "smoking gun" when it comes >> to a MastrII receiver failure like this. I'm going to dig out the book >> and see what I can find but any help or guidance would be greatly >> appreciated. >> >> Thanks in advance! >> >> Adam N2ACF >> >> >> ------------------------------------ >> >> >> >> Yahoo! Groups Links >> >> >> >> >> > > > ------------------------------------ > > > > Yahoo! Groups Links > > > > >
