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Old 12th May 2012, 12:37 am   #1
Skywave
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Question 'Practical Wireless' GDO design, circa 1967/9

I distinctly recall 'Practical Wireless' published a design for a grid dip oscillator during 1967 - 1969. IIRC, it used a twin-gang capacitor (probably a Colpitts osc.) and probably one triode valve. Sorry that I can't narrow down that date range and that I can't provide any more details: it was a long time ago.

Can anyone identify the particular month - or even publish the particular design - for me, please?

Thanks,
Al. / May 12th. //
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Old 12th May 2012, 7:52 am   #2
KeithsTV
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Default Re: 'Practical Wireless' GDO design, circa 1967/9

Was it this one from July 1966?

I'm sure there were others during the period 66 to 69 but this was the first one that came to mind.

Keith
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Old 12th May 2012, 9:06 am   #3
Skywave
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Thumbs up Re: 'Practical Wireless' GDO design, circa 1967/9

Ah, yes - thank you Keith. That's the one: it was a very long time ago. A far back as 1966 eh? My goodness!
The reason for my enquiry is simply that I built this many years ago and I recall that it worked very well. Many years have passed since, and although I realise the usefulness of it, the one I built cannot be found. So . . . time to build another!

Al.
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Old 12th May 2012, 4:11 pm   #4
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Default Re: 'Practical Wireless' GDO design, circa 1967/9

Hi Al,
PM sent.
Rob.
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Old 12th May 2012, 7:19 pm   #5
greenstar
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Default Re: 'Practical Wireless' GDO design, circa 1967/9

How about this one? Based on a tuning indicator - possibly one can use one of the later types?
Tony
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Old 12th May 2012, 8:18 pm   #6
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Thumbs up Re: 'Practical Wireless' GDO design, circa 1967/9

Quote:
Originally Posted by glowinganode View Post
Hi Al,
PM sent.
Rob.
Thanks Rob.
PM received and responded to.

Al. / May 12th. //
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