'Practical Wireless' GDO design, circa 1967/9 - UK Vintage Radio Repair and Restoration Discussion Forum

Skywave · 12th May 2012, 12:37 am

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. //

KeithsTV · 12th May 2012, 7:52 am

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

Skywave · 12th May 2012, 9:06 am

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.

glowinganode · 12th May 2012, 4:11 pm

Hi Al,
PM sent.
Rob.

greenstar · 12th May 2012, 7:19 pm

How about this one? Based on a tuning indicator - possibly one can use one of the later types?
Tony

Skywave · 12th May 2012, 8:18 pm

Quote:

Originally Posted by glowinganode

Hi Al,
PM sent.
Rob.

Thanks Rob.
PM received and responded to.

Al. / May 12th. //

12th May 2012, 12:37 am	#1
Skywave Rest in Peace Join Date: Jun 2006 Location: Chard, South Somerset, UK. Posts: 7,457	'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. //

12th May 2012, 9:06 am	#3
Skywave Rest in Peace Join Date: Jun 2006 Location: Chard, South Somerset, UK. Posts: 7,457	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.

12th May 2012, 4:11 pm	#4
glowinganode Octode Join Date: Apr 2009 Location: Aylesbury, Buckinghamshire, UK. Posts: 1,522	Re: 'Practical Wireless' GDO design, circa 1967/9 Hi Al, PM sent. Rob. __________________ We have done so much, for so long, with so little, we are now qualified to do anything with nothing.

12th May 2012, 7:19 pm	#5
greenstar Octode Join Date: Jul 2011 Location: Leicester, Leics. UK. Posts: 1,684	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 Attached Thumbnails