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----- Original Message -----

From: Dario via Groups.Io

To: [email protected]

Sent: Saturday, February 23, 2019 7:07 AM

Subject: Re: [HP-Agilent-Keysight-equipment] 8970B Problem

Hi Kevin, this is the link for AN1484 (and other info, manual, etc.):

Dario IU3ARP

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Il 23 febbraio 2019 alle 7.53 kevin kearns <kkyahoo@...> ha scritto:

Got a link to AN1484?

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Kevin

----- Original Message -----

From: alwyn.seeds1

To: [email protected]

Sent: Friday, February 22, 2019 11:30 PM

Subject: Re: [HP-Agilent-Keysight-equipment] 8970B Problem

Dear Dave,

Thanks.

Yes, uncorrected NF is normal.

The explanation proved to be that given in AN1484.

So I’ve learned something, for which I am most grateful.

Regards,

Alwyn

IIRC there is an IF output on the rear. Have a look at that with a spectrum analyzer. I had an 8970B which showed stability issues.?

Is the uncorrelated noise figure in spec? I believe its about 6-8 dB depending on frequency.?

BTW, I believe someone has created a device that makes an 8970A/B show a negative noise figure by it having a negative input resistance.?

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Alwyn Seeds, Director
114 Beaufort Street (Management) Company Ltd.,
114 Beaufort Street,
London,
SW3 6BU

+44 020 7376 4110

114 Beaufort Street (Management) Company Ltd., Registered in England and Wales: No. 02797775 Registered Office Address: 114 Beaufort Street, London, SW3 6BU

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