Search found 49 matches

by VE3EAR
Wed Feb 24, 2021 2:32 pm
Forum: Antennas
Topic: Best antenna for HF
Replies: 8
Views: 1907

Re: Best antenna for HF

For coverage from LF thru to HF, my recommendation is the PA0RDT Mini Whip:

https://deimert.se/miniwhip/pa0rdt-Mini-Whip-Manual.pdf

For VHF omni, a simple 1/4 wave ground plane is easy to build and works well.

73, Bruce, VE3EAR
by VE3EAR
Sat Jan 30, 2021 5:08 pm
Forum: Antennas
Topic: Loop on ground question
Replies: 3
Views: 782

Re: Loop on ground question

The perimeter of a full-wave loop hanging in free air will be much different than one that is laying on the ground. The ground's proximity to the loop will have a varying effect, due to the composition of the ground....black soil, gravel, or sand, each will effect the loop differently. Based on that...
by VE3EAR
Thu Jan 07, 2021 4:49 pm
Forum: Antennas
Topic: Log-periodic antenna for UHF
Replies: 4
Views: 1086

Re: Log-periodic antenna for UHF

I've had reasonably good results with a number of antennas that required a balanced feed, by using cable-TV grade 75 ohm to 300 ohm baluns. The ones I'm using are made by Magnavox and have a blue coloured plastic cover over an aluminum enclosure. The 75 ohm side is an F female, while the 300 ohm sid...
by VE3EAR
Sat Dec 12, 2020 4:26 pm
Forum: Antennas
Topic: What coax
Replies: 3
Views: 809

Re: What coax

For many years now I've been using RG-6 coax for all of my receive antennas, and despite it being 75 ohm, my receivers can't tell the difference! It's cheap, available online from Amazon and others, and adaptors to go from the "F" type connector to others are readily available. I use the "pigtail" t...
by VE3EAR
Wed Dec 09, 2020 3:57 pm
Forum: Antennas
Topic: Best bang-for-buck discone antenna suggestions
Replies: 1
Views: 732

Re: Best bang-for-buck discone antenna suggestions

I'm not familiar with any of the present day discone antennas, but if you can locate an ex-military one made by the Rudolph Wurlitzer company, you will find it to be an excellent antenna. I've had one up for years, to listen to the mil-air band as well as the amateur radio 70 cm band. Do a Google se...
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: 1
Views: 1004

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: 1398

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: 1398

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: 1408

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: 13673

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