[time-nuts] VNA design

Scott McGrath scmcgrath at gmail.com
Wed Jun 4 07:29:48 EDT 2014


The way the 8410 was automated HP built an add on DAC module to convert the plotter outputs to digital form and used an 8350 sweeper to replace the BWO sweepers commonly used by 8410 systems and a relay controller to do the test set switching

They called this rig the 'Automatic Network Analyzer'

Sent from my iPhone

> On Jun 3, 2014, at 2:22 PM, paul swed <paulswedb at gmail.com> wrote:
> 
> Boy this is not time-nuts and I had been deleting the thread. No problem
> with the thread. Just I have HP VNAs. Yes including what caught my eye the
> 8410 that Scott spoke of and its still operational. Heavy as heck like real
> equipment should be.
> I am curious I sort of thought the 8410 was pre micro processor and yet
> some how the HP85 hooked up to it??
> 
> I have the 8757 also so. Great comment by Dave on the fact that someone
> will give out some of the old options. Now I have to figure out what on
> earth that might actually mean.
> Regards
> Paul
> WB8TSL
> 
> 
> On Tue, Jun 3, 2014 at 12:57 PM, Dr. David Kirkby <drkirkby at gmail.com>
> wrote:
> 
>>> On 3 June 2014 16:54, Scott McGrath <scmcgrath at gmail.com> wrote:
>>> 
>>> Where are the software options for the 8753 coming from.  Agilent will
>> not even talk about a VNA that's older than the PNA series
>> 
>> This has been discussed on the HP/Agilent mailing list. Basically a
>> couple of people that work at Agilent, one of whom is
>> "caesarv at email.com" (yes email, not gmail), will give out options for
>> 8753 for non-commercial use. Just send him your S/N. I know he also
>> did likewise for an older 8720 instrument (I think 8720C).
>> 
>> Although he can, he will NOT do it for PNAs. That is one advantage of
>> getting a used 8753/8720 over a used PNA!
>> 
>> Agilent offered to repair my 8720D a couple of years ago, and managed
>> to give me a quote via email as it was abundantly obvious what the
>> problem was - a damaged thread on a test port connector. The only
>> problem was they wanted to change the whole coupler, so it was going
>> to cost the US equivalent of around $5000. A mate of mine sorted out
>> the nick on the thread with a needle file!!!
>> 
>> Dave
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