Anyone know where to find...

[W5LZ]

It's been a while, but I remember seeing a full wave loop for 10/11 meters that was mounted vertically and quite a bit 'taller' than it was 'wide'. If I remember correctly the input impedance of the thing was very close to 50 ohms, or was easily matched with a 'Q' section. It has to have been in one of the ARRL's antenna books or the handbook. No idea which edition of either. Anyone else remember that @#$ thing, and where to find it? I'm really tired of thumbing through books looking for it. Actually, I'm tired of getting distracted by something else and forgetting what the @#$$ I was supposed to be looking for to start with!
- 'Doc

 

[Captain Kilowatt]

Was it called the Hentenna? Did it look like this one here?

THE HENTENNA RE-VISITED

Another link here.


http://www.dxzone.com/cgi-bin/dir/jump2.cgi?ID=14405

 

[W5LZ]

QRN,
No, it wasn't one of those, but thanks for the links, I've got something else to play with! The thing was a very simple 'vertical' loop, nothing fancy at all. There was some kind of particular relationship between H x W, but I can't remember what that was. That's the only reason I'm looking for it, want to know what that HxW ratio thingy is/was, and why it worked. One of those, "If the thing is so fantastic, why ain't everybody got one?", kind'a things you know?
- 'Doc

 

[1342]

It's been a while, but I remember seeing a full wave loop for 10/11 meters that was mounted vertically and quite a bit 'taller' than it was 'wide'. If I remember correctly the input impedance of the thing was very close to 50 ohms, or was easily matched with a 'Q' section. It has to have been in one of the ARRL's antenna books or the handbook. No idea which edition of either. Anyone else remember that @#$ thing, and where to find it? I'm really tired of thumbing through books looking for it. Actually, I'm tired of getting distracted by something else and forgetting what the @#$$ I was supposed to be looking for to start with!
- 'Doc

hey W5LZ i thought you might like this picture.i originally used the 1005/frequency=length and after talking to a ham buddy and reading around my conclusion was that 468/frequency*2=length seemed much easier.this loop was meant for the top of 27 mhz and i started at about 36.5 feet with 9 ft feedline and after the new formula cut it down to about 33 feet.i know a full wave is 32 feet and i might end up there however i took your advise and shortened the feedline to 5.7 feet thanks for that.match is around 1.2-1.3 or flat after it rains.its currently about 10 feet of the ground on the addition and talks local 60+ miles i talked all over the us on it this last week.i will trim it down some and i am thinking of mouting it vertical do you know if it would radiate from the sides(wires) or front/back.

 

[W5LZ]

Glad it workd for you.
A loop can be directional. Typically, it's bi-directional looking through the thing like an aiming circle, if it's stood up straight. Nulls in line with the sides of the thing.
And to make it just a bit more 'fun', by varying the lengths of the sides versus the top/bottom lengths, you can change the radiation pattern sort of quite a bit, especially if the thing is horizontal, or laying down. And if you want to get a bit more ambitious, making the thing a multiple of a full wave length and varying it's dimensions changes things even more (including it's input impedance so it ain't 'dead' easy, and you always 'pay' for what you get ).
- 'Doc

 

[SR385]

Any full wave delta loop design will work in pretty much any shape. The most efficient pattern though is when the loop is basically a circle. The most evenly covered interior space is desirable.

You can run them as a delta, equilateral triangle, or a rectangle or a square etc etc, it just shifts the patterns around a bit.

A 20m full wave loop would work pretty nicely for 10m and give you 20/17/12 along with it if you feed it with ladder line and use a manual tuner with it. At two wavelengths for 10m, the pattern would be pretty even still.

 

[1342]

Any full wave delta loop design will work in pretty much any shape. The most efficient pattern though is when the loop is basically a circle. The most evenly covered interior space is desirable.

You can run them as a delta, equilateral triangle, or a rectangle or a square etc etc, it just shifts the patterns around a bit.

A 20m full wave loop would work pretty nicely for 10m and give you 20/17/12 along with it if you feed it with ladder line and use a manual tuner with it. At two wavelengths for 10m, the pattern would be pretty even still.

as you probably noticed i did not have room to do a circle on my addition but i could do a circle on the main roof however it would be an angled circle about 45 degrees tilted east hmmm i wonder how that would work.i will try it thanks.

 

[SR385]

Yeah doesn't have to be a circle, the concept is to encompass as much area evenly inside the loop as possible with circle as the ideal. 99% of people with loops are nowhere near a circle, thus deltas and rectangles all over the place.

The only rule I've found that is consistent with wire antennas so far is, more wire, higher up, has always worked better ;-). For backyard antenna builders unless they have 100+ foot trees to use...I think that will hold pretty steady.

 

[BJ radionut]

SIMPLE 10M LOOP

Hey Doc!...is this the one your looking for?

All the Best
BJ

 

[W5LZ]

BJ,
That's it! Where the devil did you find that?
- 'Doc