UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

Bazz4CQJ · 13th Jan 2018, 3:36 pm

Hi Jeremy; I recall now that it was you who did some modelling for Al, and as he did finally get the wideband performance he aspired to, it seems that you got it right.

Can I ask you the direct question, based on your experience, are there factors specific to a FET that could potentially give rise to anomalous behaviour in its role as the oscillator in a GDO? I appreciate, of course that not all FET GDO's have exactly the same circuit or same device, so some may be quite satisfactory while other could have a vulnerability under some particular conditions, as yet, not defined? The few times that my FET-based GDO has given odd readings have been when using it to set up antennas - the resonances being at the wrong frequency and quite notably sharp (narrow) in the dip.

B

13th Jan 2018, 3:36 pm	#43
Bazz4CQJ Dekatron Join Date: Apr 2009 Location: Oxfordshire, UK. Posts: 4,935	Re: The Best GDO Ever Made? Hi Jeremy; I recall now that it was you who did some modelling for Al, and as he did finally get the wideband performance he aspired to, it seems that you got it right. Can I ask you the direct question, based on your experience, are there factors specific to a FET that could potentially give rise to anomalous behaviour in its role as the oscillator in a GDO? I appreciate, of course that not all FET GDO's have exactly the same circuit or same device, so some may be quite satisfactory while other could have a vulnerability under some particular conditions, as yet, not defined? The few times that my FET-based GDO has given odd readings have been when using it to set up antennas - the resonances being at the wrong frequency and quite notably sharp (narrow) in the dip. B __________________ Saturn V had 6 million pounds of fuel. It would take thirty thousand strong men to lift it an inch.