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|John Bruce McCreath||Posted - 3 December 2012 12:12 |
Over the weekend I built the circuit shown on the linked site below and was quite impressed with how it
performed on the AM broadcast band with just a 14 inch diameter, 8 turn loop tuned by a 395pF varicap.
Scroll down the page to the
DL7MWN Q-Multiplier circuit.
R6 is removed from the tank circuit, leaving just the C and L. If you bother to read the entire post, the
73, J.B., VE3EAR
|John Bruce McCreath||Posted - 5 January 2013 11:54 |
I finally got around to trying my "regen device" on a 7 inch ferrite loop-stick in place of the 14 inch round frame loop. It was awkward to do a quick A-B comparison, but I'd give the ferrite a slight edge.
73, J.B., VE3EAR
|Dan McGillis||Posted - 8 January 2013 18:53 |
JB -- couple of questions:
What was the diameter of the ferrite rod?
What type material (61, etc)?
And, how many turns of wire on it?
These loops are addictive. :-)
|John Bruce McCreath||Posted - 10 January 2013 7:58 |
I've had the ferrite antenna for decades, so I don't know where it came from or its original usage, but here are some details:
1) It's sealed inside a plastic tube that is 0.75" dia. and 7.5" long
That's about it, 73, J.B., VE3EAR
|Dan McGillis||Posted - 10 January 2013 9:39 |
I had wondered about the performance benefits of a longer ferrite rod.
Comparing a 14" air loop to a 0.5" x 4" type 61 loopstick (60t cw 165/46), I found the 14" loop to be louder.
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