开云体育

QUOTE (first paragraph): " And it turns out, at least using this particular circuit, the input transistor completely sets the noise level; the output transistor just amplifies for a higher output."

I agree, it doesn't make any sense to remove them, plus they are an important part of matching the amplifier input impedance to that of the loop, as I mentioned many times before on this group. The

I put one of these together. It's an ugly spud but it works in that I see similar results here. My various 2N2222s and PN2222s are anywhere from 3 to 6 dB noisier than the 2N5109s are. Most of the

I have 2 different WA1ION/Quantum designs and 1 of my newer designed Misek/Lankford phasers for sale. If anyone is interested please contact me off list at everettsharp (at) aol? com. ?Everett N4CY

Dirt cheap if is if Chavdar’s design.. but is it?? Transformers etc.. Though one should support Chavdar by buying his stuff. ( if want the real deal, cat5e, dipole/ loop remote switched etc..) Not

From the description on the desktop version of the page: "The amplification board in the flying fish version small loop antenna adopts the low-noise amplification of the improved version lz1aq"

Thank you Bernard. But I would caution those with strong local FM stations to think carefully before taking out the FM filter components. My LZ1AQ's definitely needs the FM filter. Without it I get a

Hi Bernard Many thanks for your work and for sharing your findings. Also many thanks to Steve for his hints. Anyway, from what I can see in the screenshots, I believe that the performance of the

The following files and folders have been uploaded to the Files area of the [email protected] group. * /First information WBL-02 BM001 July 19 2022/Improved WBL-02.pdf (

There is a link to Chavdar's website in the description. The Aliexpress link quoted is for a mobile version of their site and gives some very large images on a PC screen. Try

Hi Owen, No, had not heard of this one before. Where did you see it mentioned being LZ1AQ design? I didn't see it in the ad at that link, but could have missed it. Steve

Could this be the loop? https://www.l3harris.com/sites/default/files/2020-12/cs-tcom-rf-3134-at003-5-otm-vehicular-loop-antenna-datasheet.pdf The whips are probably for 30-88 MHz Best regards Torbjorn

Wondered if anyone has tried one of these, supposed to be lz1aq design.

I've filled in some LF noise for several transistors I didn't test--all tested transistors should now show both LF noise at 218 kHz, and 10 MHz gain and noise figure.

https://pbs.twimg.com/media/FZLtofZWIAYDpVE?format=jpg&name=900x900 Looks like a "fat loop" made of 2 conductors, about 1.2 - 1.5m diameter. Can not see the matching unit from this angle. There are

Chris Dee gave a very favorable review of using the Fairchild BF199 as the first stage in his LZ1AQ loop amp based on transistor curve tracer tests he'd conducted. I wasn't familiar with that

Thanks Andrew & Group 73 W6CJ

James, The loop to Tx antenna separation needs to be approx. 8m.? You may need to remove the? loops power during Txing to protect the Rx port. This is because the amplifier inside the Interface can

I will be adding a Wellbrook ALA1530LNP loop to a transceiver's receive-only antenna port. Will I need to add a relay, or T/R, so the loop is not getting 12 volts power when I am transmitting? Also,

I thought this computer program might be of interest: http://ham-radio.com/k6sti/coil.htm It's primarily intended for ordinary inductors, but the program has been used to design LF and MF receiving