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Hi Steve, Great detail there. I have some BFU590s. It has been said somewhere that they can be unstable at 12v or above. Pfut! Work ok at 10V. Andrew VK5CV Get Outlook for iOS<https://aka.ms/o0ukef>

My interest in this project started some time ago when I happened to notice that the original LZ1AQ circuit using 2N2222A/PN2222A transistors couldn't hear my weakest daytime LF NDB using a 39"

Great stuff Steve, Lots of different 2222s I see. I wonder if there are any gems in the other common NPNs? 2N3904s PN100 etc. Are there any PNPs that look good? 2N2906, PN200 etc. Andrew VK5CV Sent

Transformers are designed to give sufficient inductance at the lowest desired frequency of reception, at least for use in receiving-purposes. So more turns gives higher inductance, needed for lower

Yes, there is. In the CONFIG file, there is an option to set local or UTC, if I remember. But, I run my PC and laptops on UTC, so it is not an issue. Doing radio astronomy, that is the only reasonable

Thank you for the tremendous work you've done, Steve Since a couple of years i am preferring the BFU590 in SOT89 or SOT223 case. The BFU5xx series transistors are in active production and?

Guys, Going back to the 1920s. ?Keen’s Wireless Direction Finding 1927 Ed. Page 75. Describes a two turn resistance terminated loop used by Societe Francaicse Radio-Electrique.? It resembles the

So do you think this is worse than me the WBL-02 the Steve? I want to buy a reasonable loop antenna to replace the MLA30+ which is frankly junk. Unfortunately I don't have money to buy things on the

Thanks Alan for your interesting historical perspective. Roger

A loop with a resistor to produce a unidirectional pattern was patented by Harrold Beverage in 1941, since then the idea has been periodically "re-invented" by many individuals but the idea is very

Some more transistors added including Martin's request for MRF581. Steve LF Noise Output 10 MHz gain, NF 2SC5551 -92 dBm +10.55 dB, 0.93 dB NF BFU590 -93 dBm +10.48 dB, 1.02 dB NF BFP196 -93/-92

Hi Steve, Any chance of measuring an MRF581 to add to your list. Regards, Martin

I love it when manufacturers make claims of low noise, etc. then don't provide any data to support the claim. Another transistor worth avoiding. Chris When the going gets weird, the weird turn pro -

Looks like a variation of a Rhomboid antenna, very popular in the 1950s for DXing. Chris When the going gets weird, the weird turn pro - Hunter S. Thompson

As Fred said, "RE" code translates to 2SC3357. I removed one transistor from the HFDY board and tested it in my "half LZ1AQ" LF noise output board with the 2.5 uH toroid on the input, and then in the

Here is a Link to a picture of the loop amplifier boar:: HFDY Loop Amplifier Board ( https://share-your-photo.com/9657995c3a ) The transistors used are marked as RE, which belongs to an 2SC3357 (pdf

Hello Steve Thanks for your review: I'll give it a try, thinking to change something on the PCB. The accessory you found is an adapter for use the antenna with receivers like Tecsun or similar. These

My HFDY active loop antenna came today--I ordered it August 9, so ten days for it to arrive from China--not bad. The loop amp itself is very small, and gets very hot during operation. Everything

One wonders if a copy/ based upon Ccw cardioid loop.. which itself is based upon a military 70’s loop if it is i run 2 on 160m ( but bigger.) Cross country wireless Google.. Simon g0zen

Sorry, guys and gals. Copy/paste is blurry. However, if I just hit "+", the numbers are clear. However, I have a problem regarding these plots. In the lower right corner of each pattern plot, the "max