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Old 21st May 2019, 4:56 pm   #1
stuart_morgan_64
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Default Advance Type 74 use?

What is this used for, any info would be useful

Thanks
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Old 21st May 2019, 5:08 pm   #2
ms660
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Default Re: Advance Type 74 use?

It looks like a crystal marker (heterodyne job) to calibrate a signal source?

Lawrence.
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Old 21st May 2019, 5:24 pm   #3
stuart_morgan_64
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Default Re: Advance Type 74 use?

Thought it was for a source rather than being a source itself, perhaps have to max the magic eye. Can't find manual etc.
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Old 21st May 2019, 5:43 pm   #4
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Default Re: Advance Type 74 use?

I was thinking Xtal osc inside the unit heterodyning at fundamental (or harmonics of) with a signal source (RF in)

Lawrence.
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Old 21st May 2019, 6:56 pm   #5
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Default Re: Advance Type 74 use?

It looks to be as I thought.....A snippet view from Google books search....

…..British Communications and Electronics - Volume 4 - Page 122
https://books.google.co.uk/books?id=06MnAAAAMAAJ

1957 - ‎Snippet view - ‎More editions
C&E 1084 for further information Crystal Calibrator The type 74 crystal calibrator of Advance Components Ltd. is designed to facilitate the setting of signal sources to multiples of 5 Mc/s or 1 Mc/s over the frequency range 1 to 250 Mc/s

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