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Results tagged with hf
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user 1563
The frequency range 3-30 MHz. HF radio waves often propagate by bouncing off the ionosphere, allowing communication between continents. This tag may also be used for questions about the 160 meter band (1.8 MHz), which while not HF is often referred to as such due to its similar propagation.
4
votes
Accepted
I just can't get out on my car mounted HF
Advice on antennas for portable operation. First suggestion: get rid of the windom. Instead, consider end-fed antenna with a counterpoise wire that is laying on the ground. The end-fed antenna can …
- 3,018
3
votes
Hexbeam receiving in other directions
I used a Traffie Hexbeam antenna for about 12 years. Even though I had a rotator for the antenna there were many times that I did not move the antenna in the direction of a given signal because I cou …
- 3,018
5
votes
What are these antennas used for?
These are designed to provide multi-frequency (HF, VHF, UHF) communications in times of emergency.
I am not familiar though with Switzerland but likely it is a government site. …
- 3,018
6
votes
How is it possible for an HF signal to go around the world when part of it must be in sunlight?
The D region does not affect all HF (3 MHz to 30 MHz) in the same way. For low frequencies, 2 to 4 MHz, the D region absorbs most signals during the sunlight times of the day. …
- 3,018
1
vote
Running ladder line through window from inside shack to outside dipole antenna - what to wat...
Am I insane for even considering a setup like this?
No.
What do I need to watch out for? Any particular things that can come back and bite me if I'm not aware of them, and how to mitigate tho …
- 3,018
2
votes
What should I look for in a modern portable shortwave radio?
To me, a good portable shortwave radio is:
Battery Powered with built-in charger.
Hand-held with telescoping antenna (removable for external antenna).
Speaker plus headphone attachment.
Very wide co …
- 3,018
1
vote
What is the best time of day/Band to make a contact with Hawaii from the East Coast?
Besides monitoring spotting sites for KH stations, you might try contacting when you know there are a lot of Hawaiian stations working the band and where they are working it. Two sources to consider. …
- 3,018
3
votes
Air conditioner duct as counterpoise?
If you run a wire up in your attic, all other conductors such as ducting, house wiring, gutters, and so on are part of your antenna system. You want to avoid near-field capacitive coupling as your lo …
- 3,018
4
votes
maximum acheivable range on CB radio by ground wave?
First, a "ground wave" is difficult to estimate since it is so dependent on all kinds of things, most importantly frequency and second the conductivity of the ground (or, water). Buildings in an urba …
- 3,018