Search found 44 matches

by VE3EAR
Thu Nov 26, 2020 2:27 pm
Forum: Antennas
Topic: What is the device called that automatically points the antenna toward a satellite as it passes across the sky?
Replies: 2
Views: 426

Re: What is the device called that automatically points the antenna toward a satellite as it passes across the sky?

You might find something with a Google search for "satellite tracking rotor control" or something else to that effect. Good luck!

73, Bruce, VE3EAR
by VE3EAR
Thu Nov 05, 2020 3:14 pm
Forum: Antennas
Topic: Mini Whip Mod For VLF
Replies: 2
Views: 907

Re: Mini Whip Mod For VLF

I think the primary intention of the isolated Rx connector on the Bias-T is to avoid ground loops, which can be very troublesome, hum wise. All of my Bias-T boxes are built into plastic enclosures, so there is "automatic" isolation. If a metal enclosure is used, then the jack for the receiver would ...
by VE3EAR
Fri Oct 30, 2020 4:08 pm
Forum: Antennas
Topic: Mini Whip Mod For VLF
Replies: 2
Views: 907

Mini Whip Mod For VLF

I've done a mod to the popular PA0RDT Mini Whip antenna, which makes it more effective for receiving signals in the VLF range, 3 kHz. to 30 kHz. Referring to the schematic below, the mod replaces just three components in the Bias-T unit, and one in the antenna unit. In the Bias-T, the toroidal RF is...
by VE3EAR
Fri Oct 09, 2020 1:40 pm
Forum: Antennas
Topic: When antenna isn’t in use best practice
Replies: 4
Views: 832

Re: When antenna isn’t in use best practice

In the 30 plus years that I've lived at this QTH, I have never disconnected any of my antennas. I have three towers, 80, 72, and 48 feet high, with lots of beams and wire antennas. I also never shut off my radios, as they are all powered for free from my solar arrays and wind turbine. Having told yo...
by VE3EAR
Sun Sep 27, 2020 2:07 pm
Forum: Antennas
Topic: Signal Splitting?
Replies: 21
Views: 11362

Re: Signal Splitting?

I can highly recommend the Channel Master CM-3414. I bought mine from Amazon.ca and use it to feed four scanners. It covers from 54 mHz. up to 1 gHz., with a gain of 6 dB on each port. They also make an 8 port unit, which at the moment is cheaper than the four port, go figure!

73, Bruce, VE3EAR
by VE3EAR
Thu Sep 24, 2020 9:04 pm
Forum: Other SDR Devices
Topic: SAQrx and UGreen USB
Replies: 0
Views: 710

SAQrx and UGreen USB

I just today took delivery of a UGreen USB sound card I bought from Amazon. I was very pleased to see that it would work at the 88.2 kHz. sampling rate that my SDR receiver for VLF, SAQrx uses. I can tune from DC to 44 kHz. with that pairing of hardware and software. Now all I need is a VLF antenna!...
by VE3EAR
Fri Sep 11, 2020 11:42 am
Forum: Antennas
Topic: Can I change the tubing diameter on a QFH antenna without having to redesign?
Replies: 2
Views: 1044

Re: Can I change the tubing diameter on a QFH antenna without having to redesign?

That shouldn't be a problem. The only likely effect of the larger diameter tubing will be a small increase in the bandwidth of the antenna. That could be a good thing!

73, Bruce, VE3EAR
by VE3EAR
Sat Aug 15, 2020 1:39 pm
Forum: Antennas
Topic: Moving Room information
Replies: 1
Views: 824

Re: Moving Room information

For receive only operation, it won't matter at all which connectors you use when fabricating your extension. Depending on the brand of cables, you may find the O.D. of RG-58 (50 ohm) smaller than that of RG-59 (75 ohm), so keep that in mind when fitting the connectors. A wrap of tape may be needed o...
by VE3EAR
Sun Aug 02, 2020 2:52 pm
Forum: Antennas
Topic: Airspy YouLoop
Replies: 17
Views: 5686

Re: Airspy YouLoop

I decided that more testing of the YouLoop was needed, but I wanted to start with a clean page. I built two identical loops using some 3/8 inch heliax scraps I had on hand. Both are one metre in diameter and employ the same feed arrangement, with a balun wound on a half inch square binocular core of...
by VE3EAR
Sun Jul 19, 2020 12:43 pm
Forum: Antennas
Topic: Airspy YouLoop
Replies: 17
Views: 5686

Re: Airspy YouLoop

Anyway, the loop I built is ~5 meters wide and 1.5 meters tall. It's a rectangular square actually, with 6 turns. The bottom of the square lays on the ground. I have 2 of them set up perpendicular to each other. I'd say you've done pretty well, working with the restrictions put on you by the HOA. A...