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| Forums | Crystal Radio Think Tank ** Advanced Forum | Loop antenna with regeneration | Post Reply | Send Topic To a Friend |
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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 schematic titled: DL7MWN Q-Multiplier circuit. http://theradioboard.com/rb/viewtopic.php?p=38740 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. :-) 73, Dan |
| John Bruce McCreath | Posted - 10 January 2013 7:58 Hi Dan, 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 Thanks JB. 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. 73, Dan |
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