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Rule of thumb: Uncoated manganese-zinc Mn/Zn ferrites (#73, #77 ) with high permeability are conductive. Nickel-Zinc ferrites Ni/Zn (#43,? #61, 4C65) with lower permeability are isolators. regards,

Here is what I use to strip the 30AWG wire wrap wire: https://www.lowes.com/pd/Klein-Tools-Klein-Kurve-Wire-Stripper-and-Cutter/5014305509?user=shopping&feed=yes 73, Mike AF7KR

Thank you, yes wire wrap wire can be used however in my tests with the binocular core I can't get more than 21 wraps using it. That would work for the input transformer (8 + 4 + 4 = 16) in this

I love to hear stories about pioneers.

If you use #30 "WIRE WRAP WIRE", the shorting of the windings to the core material is minimized greatly. ?I use this wire and never have had a problem. The insulation material "TOUGH" as nails.

Thanks for all the replies. Looks like I will order the 5/8” fuel line and try that first. I have a Drake R8A on the way and that is what I will be using with the amplified loop. Hopefully the local

I use -61 material ferrite beads, Fair-Rite 2661000101, mouser.com carries it. The -73 material binocular cores, 302 size, are Fair-Rite 2873000302, also carried by mouser.com. The -73 material is

I used a pair of cross-coupled aluminum hula hoops ( https://www.firetoys.co.uk/collections/hula-hoops/products/polished-aluminium-hula-hoop-90cm ). This is not the budget option, but the loops are

Yes, the 100 ohm pot is adjusted to try to get both 2IMD products at the same level in my tests. Steve

I love it Andy Ikin has entered the surname-only hall of fame.

Hi Gedas, I've sent you a direct email, as the settings on this IO group don't seem to allow PM's. Regards, Martin

Hi Gedas, Sure, send me a PM, I'm happy to discuss the subject. Be aware that my old website was mainly my workshop notebook at the time, and now that it is archived I can no longer update, amend or

Hi Steve, thank you for the informative measurements. Is it possible to optimize 2nd order IM Products (OIP2) with Potentiometer VR2? regards Fred

If you've forgotten where the Ikin Norton schematic is in the Files: /g/loopantennas/files/Wellbrook%2050%20ohm%20Norton%20Preamp Steve

I tested three different transistors in the Ikin Norton 9 dB circuit--2SC5551, BFU590QX, 2SC3357 (all SOT-89 package). I used Everett N4CY's PCB. All were tested at 12.0 volts supply and bias set for

Thank you very much for the replies Martin. I found your write up to be quite excellent and informative. Thank you for providing a link to it. I have read it twice and noted several questions and

Paul, you mention Carl Baum. I used to work with him on KAFB in Albuquerque. Small world........ Dave -

Ah Martin, reasoned and down-to-earth as always. One of my pleasures in retirement is belonging to groups like "Loop Antennas" where scientific literates are well represented. It's tempting to stray

You are correct. Most RF switches come with BNCs or N connectors. Heaven forbid the "UHF" connectors. All are quite common. I use those available from Alpha Delta and Diawa. If you want SMA, I'd

Thank you for the reply. I have a Airspy HF+ and need to be able to use three different antennas with it. As of now my antennas only cover MW through 2 metres so this switch seemed be be a decent