The bigger the Litz the better the performance no matter what diameter loop. Go with 660/46, given the choice. (I ordered a loop like yours, and I just received my 9.25" loop yesterday from John--he g

I put the Varactor Test Fixture diagram in the Files, under the "Antennas and Equipment" folder. Steve

Perhaps of possible interest to anyone who works with varactors. I bought 50 1SV149 Chinese-made varactors on eBay after Ray mentioned using them. They just came and I've been testing them. Other type

Hi Ray, Thanks for the info about your varactor-tuned loop. This article has been my reference for years for such loops: http://www.randombio.com/loopantenna.html I use MVAM109 varactors; this North A

Hi Ray, Thanks for your tests summary. That's a very impressive series of experiments! What was the overall coil diameter of your mini FSL and what was the width of the coil? Did you space the winding

Thanks, Rik, I never noticed he would make custom coils; I've seen his eBay ads. Steve

Hi Rik, That's a beautiful Litz loop--do you know who made it for you? I haven't seen any such loops on eBay larger than about 5 inches diameter. And it certainly made a big difference in your informa

Hi Dave, Very coincidentally, a post on the yahoo "loopantennas" today mentioned the AN-200. I'll paste the info. It may have some relevance to your experiments. (The poster apparently dissassembled h

Hi Dave, I will attempt to give some comments; hopefully I've understood what you're trying to accomplish. First of all, does the AN-200 tuned loop work for improving MW reception when it's inductivel

Hi Ray, I don't understand what you're testing here. Are both ferrite rods tuned or somehow untuned? Or is the loopstick substituting for the stock loopstick in your radio and you're trying one then t

Thanks! Steve

Ray can give details about his loop--inductance, min/max of his variable cap used to tune it, etc. I used a program by Reg Edwards to "reverse engineer" Ray's loop given the details Ray has already gi

Hi Ray, At least the way I understand loops, you can't change the impedance ratio unless you change the turns ratio. But certainly by reducing the pickup loop coupling you're improving the loop Q; you

Hi Ray, It's good to read that you're having fun experimenting with air loops, ferrite rods and your Kchibo radios. But what I'm wondering is how you came up with the very high impedance ratio for you

Hi Ray, My experiments several years ago indicated that the low end of MW was enhanced with the wire right on the rod, and high end enhanced with some spacing from the rod--for the basic single-rod lo

Thanks for doing all that work to make those tests! I've listened to the audio clips several times each now, with headphones, and even with my tired old ears that have significant high frequency loss,

The Chinese manufacturer of the Litz was still learning how to make Litz and various colors of silk insulation were used. Chinese Litz was compared to reference Litz from US-manufacturer Kerrigan-Lewi

Hi Raph, I haven't done any FSL construction lately, but I would say as a broad generality that you need an LC meter to start with. You can't just say such and such a coil diameter will need such and

I'm currently in Tucson for a couple of weeks, having arrived Saturday, flying from Boise with a stop in Las Vegas. I took my Tecsun PL-380 with "Gary modified" 7.5" ferrite rod (and LF coil) and fram

Congratulations, Richard! Wow, what a journey! Steve NE Oregon