[time-nuts] Instrument BASIC

John Green wpxs472 at gmail.com
Thu Mar 3 09:42:06 EST 2016


The one we have was part of a big DOCSIS rack that came from Scientific
Atlanta.

On Wed, Mar 2, 2016 at 11:57 PM, Gerhard Hoffmann <dk4xp at arcor.de> wrote:

> Am 02.03.2016 um 19:04 schrieb John C. Westmoreland, P.E.:
>
>> Magnus,
>>
>> This was the best answer I got so far - I am sure this isn't what you're
>> looking for:
>>
>>
>> http://www.ebay.com/itm/HP-89441A-Vector-Signal-Analyzer-Opt-1C2-AY9-UFG-AY7-AYA-/252278222960?hash=item3abcf43070:g:uRMAAOxyNo9SojsE
>>
>> I have one more person that I am waiting for an answer/suggestion from - I
>> am not sure if there are any 3rd parties out there supporting this other
>> than what you might find on eBay.
>>
>> Interesting aside is some of these are selling for more than they were
>> being let go for after the first dot-com-bomb.
>>
>> The market for these was quite small, mostly cell phone developpers,
> and they have made the jump to LTE already a long time ago. The 89441A is
> not
> good enough for LTE, so they probably have discarded their surplus stuff
> long ago. Mine was pre-owned by Motorola I was told.
>
> Dynamic range  < 10Hz is severely degraded by 1/f noise. It took me
> 60 to 80 dB preamp gain for my noise measurements to hide that.
> Then there is not much dynamic range left over.
>
> It was easy to put on the network with a €25 BNC to Western plug
> adapter from Amazon. But you still need both BNC terminations even
> if there is no real Ethernet coax cable. Works much better.
>
> Controlling is as easy as opening port 5000-something on 192.168.1.123
> and and dumping GPIB commands. I have done a program to do FFT
> analysis over 7 decades (Linux, gcc, gnuplot...). Source is available.
> Ooohps, I'm not supposed to think about that ;-)
>
> regards, Gerhard
>
>
> I really like that 89441A!
>
>
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