DC Rcv - 1

Spent sometime these last few days building up the G3RJV Polyvaricon Tuned Sudden Receiver. The idea came from a Christmas gift that Doug, KI6DS, presented to the attending members of the NorCal Dec 2006 meeting. You can see the article at http://theqrper.blogspot.com/2008/10/christmas-past-sudden-holiday-surpr....

I had one problem after laying the circuit out…the internal oscillator in the NE602 (you can also use a SA612), pins 6 and 7, would not start to provide the LO for the mixer. Turns out I tried to take a shortcut and only wind three turns on a ferrite core instead of 31 turns on a iron powder core roid to make up the L/C circuit. Using ferrite for a oscillator is not a good idea as the circuit Q will be lousy and not work at all.

I listened to 40 meters this afternoon after my grandkids headed back to IL and I really like the sound of this receiver. I may have to do some more direct conversion receivers just to get a really good feel for them.

My thanks to the fine folks on the qrp-l.org mail reflector! They always seem to be there to help out with suggestions and advice! Lots of collective and sound grey material on that reflector.