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8662A
开云体育I have made some progress since my initial post on my defunct 8662A. One of the 2N5397 JFETs in one of the oscillators was defective and now both oscillators need to be aligned as they only operate in certain band segments. There are 3 miniature pots on each VCO, two of which adjust the IDS for each FET and the other for the VS of the FETS. Has anyone repaired these VCOs in the past that may be able to share their experience. I feel I am real close to getting it to play. Thanks – Mike ? Mike B. Feher, N4FS 89 Arnold Blvd. Howell, NJ, 07731 732-901-9193 ? ? ? ? ? ? |
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John Miles
开云体育Mike,
you might write to Tom Bruhns (k7itm?(at) aol.com, or tom_bruhns (at)
agilent.com)?and see if he can hook you up with the in-house service
procedure.? He's an?Agilent?engineer who's frequently very
helpful on rec.radio.amateur.homebrew.? This?sounds like one of those
adjustment processes that really shouldn't be?done empirically for fear of
degrading the phase-noise specs.?
?
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john KE5FX
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开云体育Thanks for the tip John. Another list member was able to provide me with the schematic (from a book by Ulrich Rhode), but of course no information on adjustment was available. The main reason I obtained the 8662A was because of it’s low phase noise characteristics. First, however, I need to get it working and without these oscillators being in range the output loops do not lock. I will email Tom and see what he may be able to come up with. Thanks again. 73 - Mike ? ? ? Mike B. Feher, N4FS 89 Arnold Blvd. Howell, NJ, 07731 732-901-9193 ? ? -----Original Message-----
From: John Miles [mailto:jmiles@...] Sent: Friday, August 06, 2004 2:14 PM To: hp_agilent_equipment@... Subject: RE: [hp_agilent_equipment] 8662A ? Mike, you might write to Tom Bruhns (k7itm?(at) aol.com, or tom_bruhns (at) agilent.com)?and see if he can hook you up with the in-house service procedure.? He's an?Agilent?engineer who's frequently very helpful on rec.radio.amateur.homebrew.? This?sounds like one of those adjustment processes that really shouldn't be?done empirically for fear of degrading the phase-noise specs.? ? -- john KE5FX
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John Miles
开云体育That
reminds me of a?really cool tip that most people haven't noticed yet.?
Amazon provides full-text searches of many of their books now,?including
technical books.? You can pull up the Rohde reference?just by
searching for "8662a" at ?and clicking on the page
number it gives you.? You will then be able to retrieve .PDF-quality images
of +/- 2 pages in either direction.?
?
No,
really, it's that simple.?
?
The
feature appears to be down at the moment.? ?I hope they haven't
figured out what a one-sided giveaway it is to offer a feature?like that
for technical/reference books that may be purchased only for a few specific
tidbits of information.? With the right cookie-deletion tricks, you can
probably read the whole book that way if you're patient
enough.
?
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john KE5FX
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John Miles
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开云体育That’s pretty neat. Even if you do have to give them a credit card number. Thanks for the tip. I did email Tom and hope to hear back as he is probably my best bet right now. 73 - Mike ? ? Mike B. Feher, N4FS 89 Arnold Blvd. Howell, NJ, 07731 732-901-9193 ? ? -----Original Message-----
From: John Miles [mailto:jmiles@...] Sent: Friday, August 06, 2004 2:48 PM To: hp_agilent_equipment@... Subject: RE: [hp_agilent_equipment] 8662A ? That reminds me of a?really cool tip that most people haven't noticed yet.? Amazon provides full-text searches of many of their books now,?including technical books.? You can pull up the Rohde reference?just by searching for "8662a" at ?and clicking on the page number it gives you.? You will then be able to retrieve .PDF-quality images of +/- 2 pages in either direction.? ? No, really, it's that simple.? ? The feature appears to be down at the moment.? ?I hope they haven't figured out what a one-sided giveaway it is to offer a feature?like that for technical/reference books that may be purchased only for a few specific tidbits of information.? With the right cookie-deletion tricks, you can probably read the whole book that way if you're patient enough. ? -- john KE5FX ?
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