Hi folks,
Received wisdom here is that repairs on such high frequency modules are rarely a runner since the position of the parts can be critical. I have been ignoring that when I feel like it. If the blown parts will desolder easily, small changes made can usually be ignored. But if you have to wrestle with even one diode or apply too much heat, forget it. You go down in flames. Use full data sheets in specifying any equivelant, as the capacitance will be a designed in component. Finding such parts can be a massive challenge.
Pieter Hoeben wrote:
Hi,
I have the same device. And also another anlyser that is broken.
What often happens is that a @#$% hobbyist connects his sender directly tot the analyser to see the harmonics. So you come back from you holidays, and find your analyser... aaargh
These analysers have ring-mixers at the input, 4 fast diodes, that can only handle 1 Watt or so. I do know that HP input modules are expensive. You could try to fix it yourself, but please note: the small wires you will see are actually coils in the gigaherz region, do not bend them!
You need very fast diodes. My broken Polarad analyser uses for its 2 Ghz range a 4 GHz local oscillator. The diodes must be able to handle that without too many losses.
Hi,
today I got a HP 8559A spectrum analyser. Unfortunately the input stage seems damaged (every thing works, but I do not see any change in the display when I apply a signal - only noise). It can display a range of 3GHz at once (and with mixing up to 21GHz). What do you think? Are there any chances that I can repair the input stage myself? I have not opened it yet, but I guess there are some hard to get parts inside, and I do not have any circuit diagrams. Anyone here with some experiences in this field?
thx in advance,
--
With Best Regards,
Declan Moriarty -- Author: Declan Moriarty INET: [EMAIL PROTECTED]
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