upvote

points

by microgpt9 hours ago |
comments
upvoteby aeonik8 hours ago|
[-]
There is a very small slice that amateur radio gets in this band, in theory it would be nice to have a bigger slice, but honestly, building antennas for this band to transmit anything worthwhile would be pretty hard.

My 7 Mhz antenna (HF, 40m band) is 67 feet long, and goes across by whole house.

The smallest antenna you could get away with for LF would be hundreds to thousands of feet long.

You might be able to go smaller if you enjoy suffering. Though, there are some pretty creative antenna designs that defy logic.

reply
upvoteby dotwaffle2 hours ago|
parent|
next
[-]
Before Radio 4 LW was renumbered in 1988, it was 200kHz. And before the early 70s it was referred to as it's wavelength... 1500m :P
reply
upvoteby microgpt7 hours ago|
parent|
prev|
next
[-]
Does stapling it to your neighbours' fence lines and painting it like the wood count as creative?

I wonder if you can couple to your local distribution grid, and not get arrested.

reply
upvoteby aeonik3 hours ago|
parent|
[-]
I just string the antenna across my attic.

Coupling into my power upstairs is a bit of a problem sometimes though.

Pirating power is something I've heard that happens, but I looked it up, and couldn't find an actual cited example of someone doing it via induction.

Plenty of people doing it via extension cords and device tampering though.

reply
upvoteby ErroneousBosh1 hours ago|
parent|
[-]
> Coupling into my power upstairs is a bit of a problem sometimes though.

I haven't worked with my end-fed on 40m for a couple of years. We've recently all had our crappy old aluminium-cored BT lines replaced with shiny new fibre though, so this time I am unlikely to lift the coveted Worked All DSLAMs trophy ;-)

reply