From: [email protected]
[mailto:[EMAIL PROTECTED] On Behalf Of Nate Duehr
On Jul 8, 2008, at 9:47 PM, de W5DK wrote:
> We were getting ready to replace the antenna at 580 ft and spend
> some money after the dummy load test. Luckily the amp finished
> failing. What I relayed locally after this experience was that a
> complete system that works flawlessly into a dummy load may not be
> flawless.
Don,
I think you said you looked at the PA output with a spectrum analyzer
prior to its failure -- did you see anything?
Was your MASTR II VHF, or UHF?
Nate
Ours was VHF. I did look at it with my HP8921 SA, into a dummy, into the
antenna, varied the output. Over the air and through the sampler. Rechecked
the matching, bypass the isolator. I really wanted to find a problem at the
ground level. The dynamic range of the SA will only let you see so low.
BTW, I only had a 30 minute driveJ
Parts are getting harder to find. So who has the all inclusive "instructions
and part numbers to install an RF brick into a master II station" VHF and
UHF versions of course. J
73
Don
