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Sets, Parts and Service Information Offered (private sellers only, exact price required, no swaps) You may announce components or sets for sale or offered free here. Private collectors only - no traders. You must include an exact price. No swaps.

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Old 25th Nov 2020, 2:00 pm   #1
Anthony
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Default Two Hewlett-Packard 540B Transfer Oscillators FOC

I have 2 of these surplus to requirements. They have not been out of warm, dry, storage for several years but were fully operational. I know that one lacks a signal input plug but both are in excellent cosmetic condition. They are beautifully-made and unmolested AFAIK. If there is any interest I shall pull them from storage and check them. Please let me know of any interest (non-binding).
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Old 25th Nov 2020, 3:13 pm   #2
mickm3for
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Default Re: Two Hewlett-Packard 540B Transfer Oscillators FOC

Hi i would be intrested if posting is an option .
they are usefull for frequency mesurments
ie A transfer oscillator, somewhat like a frequency counter prescaler, allows you to read frequencies far beyond the range of the counter you are using it with, well into the microwave region, 12.5 Gigahertz without the associated mixer. with the mixer it is extended to 18 GHZ.

It was designed to be used with the ancient model HP524, a 10 Mhz counter from the 50's.
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Old 25th Nov 2020, 3:51 pm   #3
factory
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Default Re: Two Hewlett-Packard 540B Transfer Oscillators FOC

Also interested, the 540B model could also be used with the 5243L (which I have one of in my collection), not yet found an earlier 524 series.

David
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Old 25th Nov 2020, 4:05 pm   #4
Eddystone
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Default Re: Two Hewlett-Packard 540B Transfer Oscillators FOC

Just for interest...

So is this an "injection locked oscillator" type thing which locks to a subharmonic of the incoming signal?

Regards,

Rob

EDIT: Answered my own question with a bit of Googling. No it uses a proper PLL approach:


http://www.leapsecond.com/pdf/an200-1.pdf

Last edited by Eddystone; 25th Nov 2020 at 4:10 pm.
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Old 25th Nov 2020, 7:14 pm   #5
Anthony
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Default Re: Two Hewlett-Packard 540B Transfer Oscillators FOC

There is some interest so I shall dig them out in the next week.
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Old 25th Nov 2020, 8:35 pm   #6
Buzby123
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Default Re: Two Hewlett-Packard 540B Transfer Oscillators FOC

This, I think, is instruction manual for the US military version ...

http://bama.edebris.com/download/hp/540b/HP%20540B.pdf

Scroll down past all the army talk, and you should see your 540B and some instructions.

Cheers,

Buzby
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