GDO2 - Update

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Re: GDO2 - Update

Post by Admin on Tue Mar 21, 2017 7:58 pm

... and I have added them to the project. Only have to scan the dial and post that.

BR Harry

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(Thanks to those who tried and couldn't make the QSO. Back on 14.200MHz Sundays from the 24th Sept.)
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Re: GDO2 - Update

Post by Admin on Wed Mar 01, 2017 10:14 pm

PS - Make that SIX coils. Just added 58 MHz to 152 MHz (I can't sleep!).
Works a treat Very Happy  Sleep

/BR Harry

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GDO2 - Update

Post by Admin on Wed Mar 01, 2017 9:10 pm

Hello once more,
It is interesting that just two resistors, two capacitors and a FET can give me so much fun-time on the workbench. It's only a simple little oscillator!

I have been experimenting with the oscillator layout and I am presently working (or is that "playing"?) with the coils.

I now have five different coils and the GDO is extended from 2.9 MHz to 72 MHz. It also works well as an FM transmitter but at the moment I am using my Spectrum Analyser (with Zero-span) with headphones to demodulate it. All the coils so far are now documented on the homepages, and I will add more as and when I complete them.

Another unexpected bonus was the frequency vs coil-winding. I tried to duplicate the coils and the tuning/calibration was perfect :-) So if you think of making one for yourself then you wil be able to use my finished dial file, when it is published.

Ok, then have a load of fun.

BR Harry (SM0VPO)
(PS - the "fun with Mothercare" trick does not work anymore. They have changed the frequency in the shops :-( )

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