Hi, i used for my 40x40cm air loop a cheap plastic capacitor ($1 on Aliexpress) and it works great. I have always seen using air capacitors, except in some low cost commercial loops like the Tecsun

Gary thank you very much for your answer. All these tests made in the past are of great help, not just to replicate your great and well detailed projects but also to address experiments in the right

Here is how it performs in air band https://swling.com/blog/2019/01/critical-reviews-of-the-37-hanrongda-hrd-737-shortwave-radio/

Thanks for the reply. The air band is fairly busy where I live and I have spent a lot of time in the past listening to it. I am considering expanding my listening to this again. Locally Jaycar sell a

Not sure how much you expect to hear. There is a lot of dead air on the airbands, depending upon where you are in relationship to major airports or air routes. I live in Southern California between 2

Thanks for the reply. No I had not seen that, it does not answer my question anyway. -- Paul - Moderator UltralightDX

Did you see this- https://swling.com/blog/2019/01/inside-the-hanrongda-hdr-737-wide-frequency-receiver/#comments -FARMERIK

Hi all. Can anybody confirm if this radio can :scan" the

<<< Hi Gary, I'm poking at you! You have the smaller FSL's to use in a comparison test. The crystal radio guys love this material because of the high Q's they get with it. Maybe mkmak222 would give

Gary- For some reason I could not get the link you posted open, but I found what appeared to be the same title in the files of this group. Now I see it is also in a new related group. I should join

In response to Gary's 2012 length to diameter conclusions, there is another characteristic, I haven't found any information on. That would be, how permeability affects the FSL. I see R40C1 material

Todd, have you tried adding more capacitance in better tune the lower part of the band ? The late 1960's era Gordon Nelson 4' air core loop included the ability to switch in additional capacitance for

I suggest that an unusually physically large FSL if left untuned (i.e. broadband) would produce sufficient signal output for serious MW DX purposes. But this is academic because such a physically

Hi Todd. My longest distance DX on MW from my location, Melb Sth Eastern suburbs, is 909 KHz Quanzhou with a Digitech AR-1780 with no loop antenna, I have also heard the same station on 684 KHz when

Hi Max, <<< I haven't seen your document before, very interesting, same area same performance, this makes everything much easier. I have read that the length of the rod should not exceed too much

Hi Gary, i haven't seen your document before, very interesting, same area same performance, this makes everything much easier. I have read that the length of the rod should not exceed too much the

<<< Also a question for FSL designers. Has any particular ratio of diameter to ferrite length stood out as being better, and in what way is it better. For example how might a 12 inch diameter FSL

Hi All, I recall (correctly?) that Chris Trask ( http://www.home.earthlink.net/~christrask/) had a broadband(?) preamp design that used a ferrite rod with a lot of turns so

For Sale is a Icom R75 and it is one of the good ones with S-AM, it has the optional UT-106 DSP and a added Kiwa Synchronous Detector. There are two optional Filters that were added, FL272 2.4 kHz

Just a wild idea from some one who does not understand the theory. What if you contra wound and connected in parelell a number of coils on a FSL core to provide a much lower uH than you could resonate