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This subject was extensively covered and commented on a few months ago. I'd suggest you check the archives. Personally, I don't want to tune the loop every time I chase something else. They are

I have made several similar loops for BCB and NDB work. I wind the loop to about 330uH and use a BB112 Variactor to? resonate it, fed from a 0-10V Bias-Tee (indoors) . Very sharp / hi-Q and nothing

I like tuned loop antennas for AM BCB as well as for NDB chasing. I have a 45 inch on a side box 8 turn loop wound with #12 magnet wire and also use it as a crystal radio set. A good tuning capacitor

If anyone is interested in a loop amp, or a phaser, please contact me off list. everettsharp (@) aol.com ?Everett N4CY

Yes, because it is not the genuine 2SC3357 from NEC/Unisonic, which is obsolete since a couple of years. It is a new part from EVVOSEMI, a fabless Hong-Kong based company, specialised in second

Just an update. DigiKey has 2SC3357 back in stock. They only have 1009, so it looks like they just got one reel in. They are listed as a "new" part, so I think the issue has been supply chain related

yes any off your question Den 2025-03-01 kl. 14:17, skrev Fred M via groups.io:

Lars, what do you mean with "3 m Loop"? Circumference of 3m or diameter of 3m? regards, Fred

I am curioues if any one tested THE lZ1aq Active Antenna Amplifier (model AAA-1C)? with 3m wire loop or even longer wire? 73 Lars sm4ive

Hi All, Very interesting thread. I looked at the circuit introduced. I felt nostalgia for the 2SC1815 and 2SA1015. They like staple foods for us from the 1980s until around 2010. The 2SA1015 was

A helpful free book on PIN Diodes: The PIN Diode Handbook (pdf) ( https://www.ieee.li/pdf/essay/pin_diode_handbook.pdf ) Regards, Fred

Thanks for pointing to the minority carrier lifetime (Tau) measurement. The paper reported the 1N4007's Tau = ~7 uS, phew! This value is way higher than what I have encountered in real PIN diodes (see

OK. Curiosity got the better of me, so I decided to try Dave's (W0LEV) suggestion and make a measurement with my VNA. I happen to have an LZ1AQ loop right under my 80-10 EFHW inverted L. It happens to

If you’re protecting the loop amplifier from own transmission, then you will need to use a relay to cut the power and and ground the antenna input at the loop and the feed. Also placing the antenna

Guessing and throwing ill conceived "fixes" at an ill defined and misunderstood problem is certainly the average amateur method of "solving" misunderstood glitches and possible damaging

PIN diodes have an additional P layer which is why Sarkes Tarzian never got into that part of the technology. ST made some SCR's and 45KV 2 ma diodes were many layers of diodes stacked and soldered

Cool stuff! I have a QDX 80m to 20m band model. Hans couldn't get the 1n4007s to work on 160m or below so there are single band models for MF , LF and 6m. Getting special performance from simple

Sure, there are several measurements available in the

Hi Jim, Thanks for referencing my paper. :-) However, I will not recommend that limiter configuration for protecting the Rx loop. The described Schottky assisted PIN limiter has a ~10 dB lower turn-on

Interesting question. There are interesting amateur tests of the 1N4007/1N5408 as replacements for the Unitrode P-I-N characterised diodes. At least one experiment shows that 1N5408's were lower