[Test-Equipment] wtd Faulty HP8555 mixer

[Tod-ID]

I will ask the fellow if he minds me passing along his name and email
address.  He only does this type of repair in the Winter. He lives in
Minnesota and Winters are long and Summers are short so he does not waste
any "summertime". I know that he has at least three of the 8555 mixer
modules and at least one 8554 mixer module that he is planning to repair
once Winter starts.


Tod K0TO




> -----Original Message-----
> From: test-equipment-bounces at mailman.qth.net 
> [mailto:test-equipment-bounces at mailman.qth.net] On Behalf Of 
> Chris Trask
> Sent: Wednesday, November 02, 2005 7:49 AM
> To: Tod-ID; 'John'; test-equipment at mailman.qth.net
> Subject: Re: [Test-Equipment] wtd Faulty HP8555 mixer
> 
>     Could you let us know who this person is who does these 
> repairs?  I have a pair of HP8554B's where the YIG oscillator 
> has failed and I'm told that they are repairable as it's 
> usually a wire to the output amplifier.
> 
> Chris
> 
>      ,----------------------.       High Performance Mixers and
>     /    What's all this     \    Amplifiers for RF Communications
>    / extinct stuff, anyhow?  /
>    \  _______,--------------'           Chris Trask / N7ZWY
>   _ |/                                  Principal Engineer
>  oo\                                  Sonoran Radio Research
> (__)\       _                             P.O. Box 25240
>   \  \    .'  `.                     Tempe, Arizona 85285-5240
>    \  \  /      \
>     \  '"        \                 IEEE Senior Member #40274515
>      .       (  ) \
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>        c__; c__;  '-..'>.__
> 
>                        Graphics by Loek Frederiks
> 
> ----- Original Message -----
> From: "Tod-ID" <tod at k0to.us>
> To: "'John'" <morters at global.freeserve.co.uk>; 
> <test-equipment at mailman.qth.net>
> Sent: Wednesday, November 02, 2005 7:27 AM
> Subject: RE: [Test-Equipment] wtd Faulty HP8555 mixer
> 
> 
> > I have discussed this with an acquaintance who does such 
> repair (not 
> > an HP employee now). He stated that the easy way to open 
> the module is 
> > to remove the module and them place it on a heat controlled 
> hot plate. 
> > Gradually
> bring
> > the temperatur up so that the entire module is warmed to the same 
> > temperature. When you reach a particular themperature the 
> lid will be 
> > "easily" removed. [I do not remember the exact temperature 
> he said was 
> > necessary, but could ask him if required].
> >
> > I did not discuss whether or not replacement of the actual 
> diode was 
> > 'challenging' nor whether exact replacements were required or 
> > alternate diodes were satisfactory.
> >
> >
> > Tod K0TO
> >
> >
> >
> > > -----Original Message-----
> > > From: test-equipment-bounces at mailman.qth.net
> > > [mailto:test-equipment-bounces at mailman.qth.net] On Behalf Of John
> > > Sent: Wednesday, November 02, 2005 6:49 AM
> > > To: test-equipment at mailman.qth.net
> > > Subject: [Test-Equipment] wtd Faulty HP8555 mixer
> > >
> > > Does anyone have a faulty yes faulty mixer from an HP8555 laying 
> > > about they don't want?  I'm interested in finding one to 
> open up and 
> > > take a look at.
> > >
> > > Thanks,
> > > John G3UGY
> > >
> > >
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