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I built a fair number of these, starting in the '70s shortly after Radio Shack started carrying the NE555 timer. I usually used the Micronta 50uA panel meters for the readout. I'd watch for project

Paul, The older ALA100s have lower gain and a higher input impedance compared to the more resent offerings. Therefore, I would suggest that your don’t alter the loop you already have. 73 Andrew

Would suggest Tonne software ELSIE to design crossover filter. Tonne software is exceptionally good. 73, Alan G8LCO

Hello Andrew, I have an elderly ALA100 amplifier & power injector. It is working very well, but I was wondering what recommendations you might have regarding the actual loop. I currently have a

Hi Chavdar, No need to apologise, my webpage regarding the system is quite well hidden, and I haven't done any further work on it for several years. At the time I was trying to develop a low cost

The device you require is called a diplexer. Tonne Software provide a free design tool. http://tonnesoftware.com/diplexer.html Don't worry about making it too complicated. Two coils and two capacitors

Hi Steve, Maybe you could possibly help me out. I?just purchased the Chameleon RXL receive loop. And now I wish I had found this thread before doing so. I’m very new to these antennas. I currently

You mean anything below 14 MHz comes from the loop and anything above 14MHz comes from the dipole? I think you would have to make your own. You will need a lowpass filter on the RX side of your loops'

Is there a good band pass filter you would recommend that I could have anything below 14Mhz goes to loop and anything above goes to my Dipole?? (For KIWISDR receiver)

Martin and Chavdar, I have had similar ideas but more focused on the emissions from the vehicle. Some hybrids make VHF almost unusable. Others have strong signals on the HF bands. Not quite there yet

Hi Martin, I was not aware about your postings on this topic. Excuse me for that, you are ahead of me in technology. I read them with great interest. I will add them to the links in my article. Yes

Hi Chavdar, A very interesting post, and something I would like to be able to do better. If you could capture GPS co-ordinates you could produce a heat map, something like this on one of my webpages.

I have made some measurements of the ambient electromagnetic noise during car drive. http://www.lz1aq.signacor.com/docs/electromagnetic-noise-level-during-car-drive.php Happy New Year to everybody.

While I didn't find an all-inclusive list, a simple www search yielded some useful information: https://www.rtl-sdr.com/a-comprehensive-lab-comparison-between-multiple-software-defined-radios/

May I suggest also the Elad S2 ? I have both the Perseus and the Elad S2, and have performed A/B comparisons, and to my ears they perform similarly. The Elad S2 is quite sensitive down to 10 kHz. I

But do remember that active antennas are normally powered with DC down the coax too!? You only need to put substantial capacitance in the common ground to avoid issues or use an autotransformer with

Q. Why would anyone use locking compound on plastic? A. Because they think it will lock parts together without the risk of cracking when overtightening.?? (You advised locking compound with nylock

I have seen nail polish used before and well. The other one is “glue”. Super glue is not so strong under shear stress as strain so things can still be undone. Andrew VK5CV. Sent from

I appreciate this SDR discussion, and the information/links provided! I have been on the fence for awhile between the HF+ and the RSPdx. -- Andy - Arlington TX

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