This antenna does it for Part 15 AM.
It's 16.9 feet long in ten-sections.
By good luck 10-sections is exactly three meters.
It sounds like a cool idea for a
PORTABLE Part 15 AM set-up - with any
kind of transmitter, and the correct
tuning network. Put a
couple of equipment cases down in a field -
put out some ground radials - pull the
antenna up - and there you are.
As mentioned before - the only portable
set-up I know of is a Part 15 station out
of a truck that is parked in the center of
a town every Saturday. Although I don't
know if it still exists.
I once read about a portable or mobile ham
radio antenna for 160 meters which was interesting.
Most of the antenna was helically wound. On the
top of that section was a collapsable whip antenna
that could be adjusted in length to tune the system.
I wonder how critical it was?
And... the higher the Q the
harder is would be to tune a Part 15 whip antenna,
I suppose.
Would a big whip antenna bending in the wind
change the tuning of the Part 15 system? I guess
it would depand on the overall Q?
Oh I have so much wanted to try this idea out.
But I don't think it will be happening soon.
Bruce
As often happens, Bruce MICRO1700 has reminded me of something.
Towers swinging in the wind. About a mile from here is the tallest self-supporting tower in Missouri, taller than the Gateway Arch which happens to be 630-feet.
I heard that such structures swing as much as FOUR-FEET up at the very top in a high wind!
When that tower was first built there was a story going around that one of the legs got twisted during construction, throwing the tower out of plumb by several feet. But it's still standing, so who knows.
I remember that UHF TV Channel 30 had multipaths that weaved in and out on a windy day, as their 1,000 footer swayed in the wind.
On beer night when I sway in the wind there are sometimes two of me, probably multi-path.
Towers swinging in the wind.
That would explain many odd UHF TV DX
(and local) receptions I've seen over my
lifetime.
Good grief.
Bruce
I have used a 12 Foot version fully extended on my Rangemaster with no problems.
I have used a 12 Foot version fully extended on my Rangemaster with no problems.
IIRC from a few FCC NOUOs and their subsequent web comments, wasn't a rangemaster allegedly used with antenna systems having radiating lengths much longer/taller than 12 feet?
Don't know. Do you anything you could share?
WDCX wrote: Don't know. Do you (know) anything you could share?
I'm quite sure that you and many others already know those details.
FCC generally won't complain if you have a rangemaster with a 102" whip on a mast that is about eye level or lower. they tend to get their panties in a wad over excessively high mounted transmitters (topping ten to fifty feet) with excessively long radiating leads. the exception to this rule is if you live in the same field office district that ken cartwright lives in. they seem to get bent out of shape over anything excpet a strictly ground mounted outdoor transmitter. i don't know the complete details but apparently gerry g got busted with a totally stock talking house on a second floor in oregon so there is something going on in that filed office but generally no. they don't get bent out of shape if you are a little higher than 3 meters. i have seen a 50ft installation even post ground lead re interpretation allowed to stay on the air but those instances are not very common but i have never to this day seen someone who had a transmitter mounted on a 5 ft or smaller pole get hassled by the fcc for non compliance and i know a few people personally who have them on 5 or 4 ft masts at eye level who have been inspected and passed. it's all a matter of perception if the inspector thinks your trying to pull one over on him then you will get cited. simple as that.