I used one of these in the 90's to maintain point to point microwave links. It's a pretty specialized piece of equipment with very limited use. It required a clock signal and I/Q inputs from a radio's demodulator. It's been 25 years, so there's a lot of details that have faded, but I recall it had several fixed display formats showing constellations for 16QAM, 64QAM, and 256QAM radios, possibly a couple of other formats.

It was a good tool for fine tuning linearity issues out of a digital transmitter or receiver, but not something that was needed every day. I recall that the fixed clock rates it would accept would limit it to just a hand full of line rates that were common at the time. It's not an oscilloscope, and had no provision for any function other than connecting to a receiver demod and looking at the constellation.

I have no manual, and I can't imagine any 'general purpose' use it could be put to without heavy modification. Just commenting because it brings back memories.

Mel - WA6JBD

--------------------------------------------
On Sat, 11/21/15, starmux64@... [hp_agilent_equipment] wrote:

Subject: [hp_agilent_equipment] HP 3709B Constellation Analyzer
To: hp_agilent_equipment@...
Date: Saturday, November 21, 2015, 8:48 AM

I have acquired one of these in good
condition and apparently working. I have not been able to
find a Manual for it online.? Before I try powering it up,
has anyone got a .pdf Manual that they can send me
please?
It was used to display
constellation patterns of digital radios with distortion
measurements and is described in HP Journal of July 1987.?
It needed a high impedance interface kit 15709A which?I
don't have.? It looks too good to scrap so I wondered
if it had any other general purpose
use.
Steve?









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