Indeed Brian, it was the phone number I rang, a dear old lady answered and as soon as I mentioned DASCo she brightened up ! Think DASCO stands for Derek A Smith Company.

All sorted here now, its soak testing with my HUP DFS at the moment.

Regards

Colin.

Sent from Mail for Windows 10

Hi Colin,

You seem to have got the data you need. I ran mine off 12V and was not aware of issues. It ran that way Up a 30 ft tower north of Inverness at GM3WOJ's QTH.for a couple of years.
Mine came on a section of PCB which had an 8-pin 5v SMD voltage regulator and a TTL chip buffering the output of the oscillator. The schematic that David posted looks familiar!
I always liked the fact that it had the makers phone number on it. You don't see that often!

73s Brian GM8BJF