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The only issue I see with the CSI-TC1 https://www.circuitspecialists.com/content/430516/csi-tc1.pdf Is the Id is tested at 3.56V for 6.3uA per the manual. I'm not sure the TC1 is suitable for

This is just a very tiny piece of data for wellbrook-archeologists. Redarding FLG100LN, shipped November 2020: "You have latest model with 26dB gain. Kind regards, Andrew." 73, Jukka

I'm having problems sending you a copy of the Russian document. Your article appears as pages 29-34 of a much longer document. If you google the title of your document the Russian link shows up at the

Hi Steve, OK, if that's what Andrew said he used, I'll happily accept that. The cores in mine were different to 73 mix, but he may have changed makes or suppliers over time, or perhaps more likely,

Hi Mike, * The secondary of T2 is directly connected to ground in Steve's and through capacitors in yours. That's how it was * 1.2k to ground at the output. 2.7K ? I don't know why it was there,

Hi Caaarlo, I reviewed for a curiosity your work. You designed a BPF as a pre-selector between your LZ1AQ amplifier and the loop antenna. You tested the cascaded together networks by running S21

Raphael Wasserman <wassermanr46@...> added the photo album Design of Chebyshev BPF and Results ( /g/loopantennas/album?id=296543 ) : Two cases: source load equal to load

Thank you, I tried that and also did some current measurements on what the amplifier is drawing, only about 50 to 90 mA, when it should be from 100 to 150 mA, so I suspect a problem with the

Thanks Martin, I measured the current and I get from 50 to 90 mA, so I suspect there is a problem with the amplifier. Best regards, Todd VE7CKZ

You can also buy a very inexpensive TC-1 Multi-Function Tester on Amazon and other sellers for less than $25. It will allow you to test and match J-Fet's as well as mos-fet's, bipolar transistors,

How important is gate capacitance? https://www.ti.com/product/JFE2140?bm-verify From https://www.ti.com/lit/ds/symlink/jfe2140.pdf Low input capacitance: 13 pF at VDS = 5 V ? High gate-to-drain

The TI JFA2140 is a matched pair of JFETs on a single die. No need to test and select. Rick N6RK

I should have said that the amp is a Wellbrook ALA1530LN. ?Everett

Steve, Thanks! Yes, that is an "R", not a "k" on the trimmer on closer inspection! -- =================================================================== Mike M

Martin, Comparing your schematic to Steve's I see a few differences: * The secondary of T2 is directly connected to ground in Steve's and through capacitors in yours. * 1.2k to ground at the

If anyone is interested I have a Wellbrook ALA1530 clone for sale. It is built with SMD JFETs. You can contact me off list if interested. everettsharp (at ) aol com. ?Everett N4CY

Here is a sweep of the preamp+BPF+16:1 input transformer /g/loopantennas/photo/296346/3807965 I might play a bit with the inductors and try to improve the pass band at around 3MHz,

I asked Andrew Ikin one time if he could share what core he used in his preamps for the transformers. He told me he uses the Fair-Rite 2873000302, same as I've shown on my schematic. (Amidon

The following photos have been uploaded to the Caaarlo LZ1AQ sweep ( /g/loopantennas/album?id=296346 ) photo album of the [email protected] group. *

Hi Martin,