Thanks for the words of encouragement. The two problems now for me are: time and money.....
Amos
________________________________
From: W2HX <w2hx@...>
To: hp_agilent_equipment@...
Sent: Tuesday, August 30, 2011 9:48 AM
Subject: RE: [hp_agilent_equipment] Which HP spectrum analzyer is structurally most similar to that of HP 8565A?
?
Amos, if you design and build such a device, I think many people would be interested in it
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73 Eugene W2HX
From: hp_agilent_equipment@... [mailto:hp_agilent_equipment@...] On Behalf Of Amos Ku
Sent: Friday, August 26, 2011 2:41 PM
To: hp_agilent_equipment@...
Subject: Re: [hp_agilent_equipment] Which HP spectrum analzyer is structurally most similar to that of HP 8565A?
Tim,
This email is to respond to your earlier email about having some VGA kit to replace the CRT.
I have an idea. Since all the display section does is to take the signal to be display (y-axis) and sweep the screen with sweep signal (x-axis), I can make up a digitized circuit that does the same thing as what CRT will do and connect the output to a LCD module that fits right into the window of HP 8565A, I can have a cheap solution for replacement of CRT tube circuit.
My idea came from here:
and .
About the normalizer part. I am thinking about build up something based on the same design of normalizer in SMD and place the circuits inside the large cavity where CRT is in. I can then have all the functions I need in the same box. I am thinking about changing the weird AUX connectors to some easy to get connectors from Digikey (same pin numbers, same dimensions.)
Amos
________________________________
From: mai1grp8s <mai1grp8s@... <mailto:mai1grp8s%40exemail.com.au> >
To: hp_agilent_equipment@... <mailto:hp_agilent_equipment%40yahoogroups.com>
Cc: Amos Ku <amosku@... <mailto:amosku%40yahoo.com> >
Sent: Wednesday, August 24, 2011 5:10 AM
Subject: Re: [hp_agilent_equipment] Which HP spectrum analzyer is structurally most similar to that of HP 8565A?
Hi Amos,
Try this link
My understanding is this: The 8565A was basically squeezing a 10
MHz-22GHz 141 specAn into one small box. It has a YTF in front of the
mixer to remove harmonics and noise. It is a completely analog
instrument with some early discreet logic for control.
The 8569a/b is basically the same rf section with the analog storage
tube replaces with a low speed digital oscilloscope. This is done to
allow the slow sweeps to be digitised with the slow ADC technology
available at the time, while the higher frequencies required for zero
span could bypass this for display on the tube as a cro.
It is not practical to convert an 8565a to and 8569 by replacing the
display section. This was accomplished with the 8750 normalizer..
The rf section is slightly different with better dynamic range and noise
floor - but not too different.
If the display or tube is shot, you could use the normalizer and a
normal oscilloscope. Slow sweeps can be captured woth a pc sound card
and there are some projects on the web.
Good luck
Tim
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