Re: Can I set up a 2.9 GHz (70904A) and 22 GHz (70905A) spectrum analyzer in 70004A display and 70001A mainframe?

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David,

Programming considerations (MODULE CONFIGURATION)

See 400 and 401 at

The HP 70900 (A or B) local oscillator is the controlling device in the MMS address systems. ?Configuration wise I not sure you can “slave” multiple IF and RF sections to the same LO.? Creating two groups and switching it between them is not practical as the address can only be changed by removing the LO from the mainframe and resetting the DIP switches.

By the way there is some really good information about modules/components of the system, block diagrams and their operations e.g. Page 344.

HARDWARE considerations (assuming you can MAP/slave two RF/IF combinations to one LO.)

See page 1-3 in

If you have only one LO and you want to control two separate analysers then you need use the two 300MHz ports to supply that signal to both RF frontends and switch the following

1/ the LO output between the RF front ends

2/ the tune span control between two RF front ends

3/ the video out from the IF(s) in use back into the LO section for processing.

To minimise the space used, you might consider just using use the 10Hz to 300kHz IF with the 2.9GHz frontend as sweep speed is reasonable.

Have fun!

Regards Noel

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From: [email protected] [mailto:[email protected]] On Behalf Of Dr. David Kirkby from Kirkby Microwave Ltd
Sent: Saturday, 13 October 2018 5:27 AM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] Can I set up a 2.9 GHz (70904A) and 22 GHz (70905A) spectrum analyzer in 70004A display and 70001A mainframe?

On Fri, 12 Oct 2018, 18:38 bownes, <bownes@...> wrote:

?
You have to have an IF section. There are several choices.?

But the mainframe I bought from eBay has a 70902A IF unit, and I already have a couple of IF units on the 22 GHz front end. So perhaps something like

1) Remove a partially working power? sensor to free up a slot, giving me four free slots.

2) Split or switch output of local oscillator

3) Add in the 2.9 GHz RF section,??70902A IF unit, 2.9 GHz preamp and preselector. I only have one preselector, so have no idea if that could be used with both RF units or just one. I could suffer just one.?

I assume an address of a?70902A would need changing, as I would have two identical modules.?

Does that sound workable??

Dave.?

On Oct 12, 2018, at 13:34, Dr. David Kirkby from Kirkby Microwave Ltd <drkirkby@...> wrote:
On Fri, 12 Oct 2018 at 18:15, pianovt via Groups.Io <pianovt=[email protected]> wrote:
The 21.4 MHz output from a front end module goes to the input of the IF module. The IF module has no provision for two inputs. How would you connect the two front end outputs to one IF module? You would have to reconnect those cables on the back of the system. I don't know what your application is, but keep in mind that the noise performance of the system is degraded at the low frequency end.

Vladan
?
I was not aware about the noise. I can't go into the application unfortnately.
The unit I bought does have an 10 Hz to 300 kHz IF section, so could add an IF module. From page 11 of the note someone posted,

it looks like this may be doable if the LO is amplified and split. I could consider a simple switch, or might just get away with a splitter, at some degraduable in performance. It would mean pulling out one of my power sensors, but since one does not zero well, and I have a decent power meter, that is no big deal. I can live with that.
?
Dr David Kirkby Ph.D C.Eng MIET
Kirkby Microwave Ltd
Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, CHELMSFORD, Essex, CM3 6DT, United Kingdom.
Registered in England and Wales as company number 08914892

Tel 01621-680100 / +44 1621-680100

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