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The following photos have been uploaded to the Capacitance meter 555 timer 0.1pF resolution ( /g/loopantennas/album?id=271519 ) album of the [email protected] group. * 2021-04-29

The following photos have been uploaded to the Capacitance meter 555 timer 0.1pF resolution ( /g/loopantennas/album?id=271519 ) album of the [email protected] group. * 2022-01-03

Steven Greenfield AE7HD <alienrelics@...> added the album Capacitance meter 555 timer 0.1pF resolution: Originally, I used a 50uA panel meter from Radio Shack for the display. Later, when DMMs

Clearer schematic: https://hackaday.io/project/183405/gallery#dcf3ea57d1631f816e4e82f57189dc85 Block diagram with explanation:

Hi Andy I have both and am still on the fence. I am completely a-technical but get excellent results fro both - as far as I'm concerned it's a toss-up. Actually, I prefer to use the RSPdx and SDRuno

I am also looking to buy a loop for the exact same reasons as the original poster. Why would someone pick the Wellbrook LN over LNP models? What are the advantages / disadvantages of both?

Hi Andy, If you simply wish to 'dip your toe into the water' of SDR's then the RTL-SDR.com V3 is a very good low cost introduction, especially if you want to have VHF & UHF coverage too. If you wish

Martin, I've seen these comments multiple places (can't recall one off the top of my head), but some of the comments indicate "blobs" rather than "signals" appearing in the spectrum. And some articles

Ha, the spell checker strikes again...... and use a device such as a tablet to control

Hi Andy, I'd be interested to read that comment if you can tell me where you saw it. The Airspy HF+ does suffer from 'IF blowthough' where signals in the range 0-192KHz can appear elsewhere in the

Mike, if you select another option at boot the Red Pitaya can be used as a single channel SDR? with a PC. Indeed the Red Pitaya is probably the most versatile device listed for the? advanced user.

That's the option I would go for. The ready built amplifier is very good value of money, and as you can remotely select different antenna combinations, it's an ideal basis for further experimentation.

If you want to casually listen to one signal at a time then the receivers mentioned are OK but you can pay a lot and get very little extra. But if you are into digital modes or want to monitor

The main negative factor I have read about the Airspy HF+ Discovery is about the occurrence of aliased signals. And perhaps the low bandwidth. The latter doesn't bother me much. Are the aliases due to

The original messy schematic from 1985 is here: https://www.polyphoto.com/tutorials/ElectronicCircuits/Dual555CapMeter150dpi.jpg ( http://www.polyphoto.com/tutorials/ ) At some point, I'll be making a

Hi Stephen To view the link requires that you jion hackday, whatever that is, and accept By using our website and services, you expressly agree to the placement of our performance, functionality, and

I am sorry that you didn’t receive a reply from the Wellbrook website. This may be due to my server junking some emails or an oversight. Working on the assumption that you may not require the high

I have built a number of small loops from 0.5-meter diameter to a 2-meter diameter including the preamp. I can assure you that one can home brew a well-performing loop for less than $50. The copper

Hi All, This has proven to be a very informative group so far, appreciate the information and willingness to share. I am looking for a loop that to be used as an HF RX antenna (160-10m) in an urban

Found something better on Mini-Circuits SLP-15+ ( https://www.minicircuits.com/WebStore/dashboard.html?model=SLP-15%2B ) SHP-20+ ( https://www.minicircuits.com/WebStore/dashboard.html?model=SHP-20%2B