开云体育

I used an Sa612 mixer chip feeding a LM3089 into a 386 audio amp chip. That setup is cheap and can be configured to give am and fm but no ssb.
The best solution is to find a used AOR 8000 wide range handheld receiver. That demods everything from 100khz to 1950mhz. They were 500bucks new but I just saw a working one sell on ebay for 50 bucks or so.
Another solution is to pick up a Kaito1103 SW radio. Very cheap radio that works well. Degen makes its twin. They handle Am/Fm/Ssb using the BFO on the radio.
I have to confess after adding the demodulator to my HP8558B, I never use it. By the time you zero the span, center the signal, and fool with the demodulator, it becomes work.
I find the easiest solution is to buy a wide range receiver (Icom r8500 or AOR 8000 etc.) and connect a display unit to it. Then as you tune the radio, you see the signals at the same time.
Have fun, Ken

--- In hp_agilent_equipment@... <mailto:hp_agilent_equipment%40yahoogroups.com>, ken fest <disklog@...> wrote:

--- On Fri, 12/28/12, Bryce Schroeder <bryce.schroeder@...> wrote:

From: Bryce Schroeder <bryce.schroeder@...>
Subject: [hp_agilent_equipment] What is a good shortwave radio to

use with HP 8568B SA?

To: hp_agilent_equipment@...

<mailto:hp_agilent_equipment%40yahoogroups.com>

Date: Friday, December 28, 2012, 4:10 PM

I am looking for a shortwave radio to use as a demodulator for my

spectrum

analyzer, so I can listen to the signals I see. I don't have a shortwave
receiver right now. Can someone make a recommendation, preferably for
something relatively inexpensive?

Thank you!





------------------------------------

Yahoo! Groups Links

On 29 December 2012 03:39, Jeff Machesky <jeff@... <mailto:jeff%40codebest.com>> wrote:

So I have a 3457a on the way that passes the self tests. What are the
odds of it actually working when I get it?

I'd think pretty good. Anyway, this might interest you - a review of
the 3457A. Part 1 seems pretty good - I've not seen part 2, but I'm
going to take a look.




Dave

Another problem with the 8551 (besides its' weight and therefore very high
shipping cost) it it's use of a BWO. They have a limited lifespan, and new
old stock are like hen's teeth. I got a nice one from the local estate
sale of a ham about three years ago, and it had multiple reminders on it
about not leaving it fully powered up for long periods of time. It also
can with three random BWOs and two HP sweepers that also use BWOs.


In talking with a few old timers I know from HP since then, the general
consensus was similar. They didn't worry about it at the time because they
could get new ones from Varian just down the road.


-Dave

----- Original Message -----
From: "Daniel Koller" < kaboomdk@... >
To: "hp agilent equipment" < hp_agilent_equipment@... >
Sent: Friday, December 28, 2012 6:44:17 AM
Subject: Re: [hp_agilent_equipment] HP 8551 Spectrum Analyzer FS or trade?






Hi folks,

Is there really ZERO interest in an HP 8551 spectrum analyzer? Given that
I didn't even get any comments from this usually vocal group, and having
found some replies to older posts that went into my spam folder, I figured
I'd just ask again (copied below). Perhaps a few more people are back from
the holidays as well.

Please do let me know if the group consensus is that this thing is really
just a useless boat anchor even by vintage instrument standards.

Thanks and have a happy new year!

Dan

________________________________
From: kaboomdk < kaboomdk@... >
To: hp_agilent_equipment@...
Sent: Saturday, December 22, 2012 12:48 PM
Subject: [hp_agilent_equipment] HP 8551 Spectrum Analyzer FS or trade?



Hello all,

I have an HP 8551 spectrum analyzer I would like to offer for sale or
trade. It works reasonably well, as I describe in more detail below, but I
am starting to upgrade my home shop with more "modern" equipment.

Cosmetically, the unit is clean, with some sticker residue on the display
units. It comes complete with all the necessary interconnecting cables and
the oval power cords. It weighs a TON. The RF unit alone is 90 lbs, so I
can't really ship it, even in parts. However, I live in Charlottesville,
VA, and I frequently travel up the north-east corridor, so if you live
anywhere between here and Burlington, VT, I am willing to deliver if you
can wait until March or so. Otherwise, perhaps we can make arrangements.

Some photos are posted here:


851_1.jpg A screen shot of the analyzer showing the FM band with a
dangling wire antenna and the input attenuator at 0 dB. Harmonic n=1. LO
signal on left.
851_2.jpg A 1 dBm, 2.4 GHz signal at the input with RF attenuation set to
30 dB. n=2.
851_3.jpg Same signal displayed on band 4, which uses the 200 MHz IF, n=1.
851_4.jpg The FM band again, displayed on the orange-screened 851B.

I would prefer not to part this instrument out, and to send all of it to a
good, loving home. Please make me an offer. I don't have a good feel for
price of this instrument particularly since shipping would normally be a
dominant part of the cost. Alternatively I am willing to trade for any of
the instruments below, in working or *repairable* condition. Of the
highest interest are any of the 141T SA plug-ins listed.

Any 8554/8555/8556 SA plug-ins for a 141T based spectrum analyzer,
preferably in grey paint.
182T mainframe
any 11664 A or B detectors
a 8755C swept amplitude analyzer
a sweeper covering ~MHz to ~2.5 GHz.

So, if interested, please contact me off-list and let's discuss. Thanks
and Happy Holidays!

Dan

851B/8551B Spectrum analyzer.
----------------------------
8551B: SN 625-00695 (RF unit)
851B: SN 526-00805 (Orange screen)
851B: SN 526-00339 (spare unit)

What works:
Mixer, at least at n=1, n=2 and n=3. I don't have sources to test higher
harmonics.
RF input attenuator
Stabilized fine tune - with some care
Trace centering is fine at or below 1 mc/cm, alowing one to quickly zoom
in on a signal.
Both 851B display units, with sharp and bright traces.
Fine and course tuning
Frequency vernier

What doesn't work:
Trace centering on the 3-300 MC/cm scales.
The signal jumps around when switching scales, though it can still be
tuned.
I can't follow the manual procedure in section 3-34 to set the spectrum
centering
adjustment on the front panel. The tracking meter does not respond as it
should.
As a result, LO scale pointer is ~100 MC off on scales at or below the 1
mc/cm sweep and
varies on the 3-300 mc/cm scales.
May need to reglue the scale drum at some point, but it's ok for now
The orange plastic filter in one of the 851s has cracks in it in the lower
left corner just off scale.
The tune knob had it's handle broken off, but I kept the original parts
and was able to
epoxy together a decent looking reconstruction, so it works now and looks
ok.
I can't figure out if the signal identifier works. It's supposed to shift
the signal by n cm at 100 KC/cm,
which it does, but when you press the "reference" knob, it should revert
to the n=1 state.
But instead the trace keeps moving off screen. I suspect this is related
to the issues at large spans.

What you get:
A functional piece of history - the first calibrated spectrum analyzer
from HP.
A basic, working spectrum analyzer
All interconnecting cables and oval power cords
One ORIGINAL PAPER MANUAL for the 851B display section
A spare 851B display unit (the orange one was originally paired with the
8551, judging from the stickers)
Satisfaction of working with a wonderful instrument
Herniated disks

What you don't get:
Any of the sources shown in the pictures
The instrument rack, though that can be negotiated separately
The 50 Ohm terminator on the back at the LO output. I only have a few of
these and I need them,
however it seems to work ok without it at the few frequencies I looked at.
Paper manuals for the 8551B section - but these are available on-line.
The right to return the instrument
Medical insurance










------------------------------------

Yahoo! Groups Links

Hello all,

I have an HP 8551 spectrum analyzer I would like to offer for sale or trade. It works reasonably well, as I describe in more detail below, but I am starting to upgrade my home shop with more "modern" equipment.

Cosmetically, the unit is clean, with some sticker residue on the display units. It comes complete with all the necessary interconnecting cables and the oval power cords. It weighs a TON. The RF unit alone is 90 lbs, so I can't really ship it, even in parts. However, I live in Charlottesville, VA, and I frequently travel up the north-east corridor, so if you live anywhere between here and Burlington, VT, I am willing to deliver if you can wait until March or so. Otherwise, perhaps we can make arrangements.

Some photos are posted here:

851_1.jpg A screen shot of the analyzer showing the FM band with a dangling wire antenna and the input attenuator at 0 dB. Harmonic n=1. LO signal on left.
851_2.jpg A 1 dBm, 2.4 GHz signal at the input with RF attenuation set to 30 dB. n=2.
851_3.jpg Same signal displayed on band 4, which uses the 200 MHz IF, n=1.
851_4.jpg The FM band again, displayed on the orange-screened 851B.

I would prefer not to part this instrument out, and to send all of it to a good, loving home. Please make me an offer. I don't have a good feel for price of this instrument particularly since shipping would normally be a dominant part of the cost. Alternatively I am willing to trade for any of the instruments below, in working or *repairable* condition. Of the highest interest are any of the 141T SA plug-ins listed.

Any 8554/8555/8556 SA plug-ins for a 141T based spectrum analyzer, preferably in grey paint.
182T mainframe
any 11664 A or B detectors
a 8755C swept amplitude analyzer
a sweeper covering ~MHz to ~2.5 GHz.

So, if interested, please contact me off-list and let's discuss. Thanks and Happy Holidays!

Dan



851B/8551B Spectrum analyzer.
----------------------------
8551B: SN 625-00695 (RF unit)
851B: SN 526-00805 (Orange screen)
851B: SN 526-00339 (spare unit)

What works:
Mixer, at least at n=1, n=2 and n=3. I don't have sources to test higher harmonics.
RF input attenuator
Stabilized fine tune - with some care
Trace centering is fine at or below 1 mc/cm, alowing one to quickly zoom in on a signal.
Both 851B display units, with sharp and bright traces.
Fine and course tuning
Frequency vernier

What doesn't work:
Trace centering on the 3-300 MC/cm scales.
The signal jumps around when switching scales, though it can still be tuned.
I can't follow the manual procedure in section 3-34 to set the spectrum centering
adjustment on the front panel. The tracking meter does not respond as it should.
As a result, LO scale pointer is ~100 MC off on scales at or below the 1 mc/cm sweep and
varies on the 3-300 mc/cm scales.
May need to reglue the scale drum at some point, but it's ok for now
The orange plastic filter in one of the 851s has cracks in it in the lower left corner just off scale.
The tune knob had it's handle broken off, but I kept the original parts and was able to
epoxy together a decent looking reconstruction, so it works now and looks ok.
I can't figure out if the signal identifier works. It's supposed to shift the signal by n cm at 100 KC/cm,
which it does, but when you press the "reference" knob, it should revert to the n=1 state.
But instead the trace keeps moving off screen. I suspect this is related to the issues at large spans.

What you get:
A functional piece of history - the first calibrated spectrum analyzer from HP.
A basic, working spectrum analyzer
All interconnecting cables and oval power cords
One ORIGINAL PAPER MANUAL for the 851B display section
A spare 851B display unit (the orange one was originally paired with the 8551, judging from the stickers)
Satisfaction of working with a wonderful instrument
Herniated disks

What you don't get:
Any of the sources shown in the pictures
The instrument rack, though that can be negotiated separately
The 50 Ohm terminator on the back at the LO output. I only have a few of these and I need them,
however it seems to work ok without it at the few frequencies I looked at.
Paper manuals for the 8551B section - but these are available on-line.
The right to return the instrument
Medical insurance

I've added some pictures under "3561A repair" to document a problem with my SA. All the electronics check out after replacing some parts but some of the buttons and most of the LEDs were not working on the front panel. After opening the front panel I found that this conductive foam seems to be the culprit. I've repaired LCD displays by cleaning conductive foam but the conductors in this foam seem very small. I cleaned it up with some ISO-alcohol and some of the LEDs started working but some of the key pads quit working. I cleaned it a second time and the same results. Some other buttons are working but some still not. The LED problem is solely the problem of the conductive foam but the keys could also be the conductive pads on the rubber keys. I've measured the resistance on most of the pads and they are about 50 ohms except for some that are 200 ohms and greater (up to about 480 ohms). I'm not sure what the max resistance can be and still make the key function. My solution first is to just solder the two boards with a connection harness to eliminate the conductive foam but I'm not sure how to fix the rubber key problem. I have some conductive paint but the resistance is still high, around 150 ohms. Does anyone have any success repairing this kind of problem?

Gary

Hello Steve,

even using resistors of utmost precision you would neither obtain a 600 ohms input resistance (= load resistance for the TG) nor a 50 ohms output resistance (= source resistance for the 50 ohms load).

You may verify this fact by terminating the output into 50 ohms and measuring the resulting input resistance (which will be 575 ohms). Terminating the input into 600 ohms (= source resistance of the TG) will yield a source resistance of approx. 47.916666 ohms for the load.

Regards
Martin

The recent discussion mentioning "conductive foam" reminded me of a
serious potential problem to watch for. I had an old Gigatronics 600
series sweeper in which they had used pieces of conductive rubber foam
wrapped around the outside of the microwave SMA connections, and held in
place by tie wraps. It looked like the anti-static stuff used for storing
ICs. I assume it was factory-done, for stopping any RF leakage - I
wouldn't think that's a problem when properly torqued, but I guess they
had their reasons.

Over the years, something in the foam - either sulfur compounds from
vulcanizing, or acetic acid from latex - leached out and chemically
attacked the SMA connectors to the point of mechanical failure. Trying to
undo the SMAs caused them to break apart, ruining some of the modules. The
gold-plated steel SMAs totally rotted out, while the stainless steel types
survived externally, but their inner conductors were shot, and their
threads gummed up so badly that some couldn't be umated without breaking.
All of the lower frequency SMAs and SMBs that were not wrapped, looked
brand new.

Ed

Ron,

It was the test/normal jumper, guess I moved it after I set the unit
aside and forgot to move it back.

Chuck

On 12/29/2012 12:47 AM, Ron Wilkinson wrote:

Hello Chuck,

That message is usually caused by the A2B1 3.6V Lithium backup cell on
the A2 CPU board needing replacement....

Regards.

Ron Wilkinson

mi-Biz Systems Pty Ltd
Perth - Western Australia

====

ChuckA wrote:

I've been restoring a 3562A analyzer for a couple of months I bought it
off ebay relatively cheap as it had some water damage. It's working
fairly well now, but I have a couple of startup errors, one I've

tracked

down to the A4 LO board. When I replace with a known good board the LO
errors stop, but I keep getting a "Bad Auto Sequence Table" error on
startup and I can't find any reference to that error in the manuals I
have. Anyone familiar with this error and have an idea which board

might

be the cause?

Thanks,
Chuck

-- See Early TV at: www.myvintagetv.com


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-----
No virus found in this message.
Checked by AVG - www.avg.com
Version: 10.0.1430 / Virus Database: 2637/5491 - Release Date: 12/27/12

--
See Early TV at:

www.myvintagetv.com

Conductive foam:?? I have found the torque on the mounting screws needs to be
near perfectly??equal for these to work. Lots of trial and error :-)

As for the switch contacts, I have found it is a good idea to wash??with
distilled water??after the soaking in alcohol for a couple of hours, After this,
they need to dry overnight before re-installing. They will not work right away!
BTW recently I have found placing wet things on top of my de-humidifier, where
the really dry air comes out speeds up??the process.

Best Luck

Karl



________________________________
From: Gary <GEMCCLUNG@...>
To: hp_agilent_equipment@...
Sent: Fri, December 28, 2012 10:19:59 PM
Subject: [hp_agilent_equipment] Foam conductor problems

??
I've added some pictures under "3561A repair" to document a problem with my SA.
All the electronics check out after replacing some parts but some of the buttons
and most of the LEDs were not working on the front panel. After opening the
front panel I found that this conductive foam seems to be the culprit. I've
repaired LCD displays by cleaning conductive foam but the conductors in this
foam seem very small. I cleaned it up with some ISO-alcohol and some of the LEDs
started working but some of the key pads quit working. I cleaned it a second
time and the same results. Some other buttons are working but some still not.
The LED problem is solely the problem of the conductive foam but the keys could
also be the conductive pads on the rubber keys. I've measured the resistance on
most of the pads and they are about 50 ohms except for some that are 200 ohms
and greater (up to about 480 ohms). I'm not sure what the max resistance can be
and still make the key function. My solution first is to just solder the two
boards with a connection harness to eliminate the conductive foam but I'm not
sure how to fix the rubber key problem. I have some conductive paint but the
resistance is still high, around 150 ohms. Does anyone have any success
repairing this kind of problem?

Gary




[Non-text portions of this message have been removed]

--- On Fri, 12/28/12, Bryce Schroeder <bryce.schroeder@...> wrote:

From: Bryce Schroeder <bryce.schroeder@...>
Subject: [hp_agilent_equipment] What is a good shortwave radio to use with HP 8568B SA?
To: hp_agilent_equipment@...
Date: Friday, December 28, 2012, 4:10 PM

I am looking for a shortwave radio to use as a demodulator for my spectrum
analyzer, so I can listen to the signals I see. I don't have a shortwave
receiver right now. Can someone make a recommendation, preferably for
something relatively inexpensive?

Thank you!


[Non-text portions of this message have been removed]



------------------------------------

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[Non-text portions of this message have been removed]

I think maybe you misunderstood my posting. Or I didn't write it well.

I mentioned I have an HP and an avcom but they are not what I am discussing in my posting.
The spectrum analyzer I am talking about is:
RF Explorer
it is about $250 and covers 15mhz to 2.7ghz.

Sorry if I wasn't clear in my first posting.