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Well, I went out and both grounded the loop to the shell of the BNC
connector and also tried grounding it to a ground rod I had put in
previously. The results were......... No change. I had my G313E
set to pick up WWV on 5000Khz and was doing screen captures in-
between each test and honestly couldn't see any difference, either
in the signal levels or in the noise floor. Nothing, Nada, Nil.
Before you ask, I tried grounding the tube at 45, 90, and 180
degrees and lightly sanded it so a decent connection would be made.

I also checked on the screws because someone here had said that they
had an ALA-1530 and the Aluminum loop had a couple of screws in it
about 2 cm from the loop base. There were no screws or holes to
indicate missing screws either. Hmmm. Either this person was
trying to describe this Antenna from memory or he has some other
kind of loop. I can verify that I have a Wellbrook ALA-1530
(Standard version) that works quite well. (If anyone wants to come
see it or or my ALA-100 setup, you're welcome to come.) The only
screws I could see were actually in the plastic antenna base and
they were sheet metal screws used to secure the aluminum tube to the
plastic, which I don't think could also be used to secure wires to
the tube.

Rob

Hi Rob,

inside the tube, the wires are connected to these srews with AMP clamps (you know, you press them on a cable and they have a little U-shape or O-shape to put a screw through.

Patrick.

Rob Moore <rmoore5@...> wrote:The only
screws I could see were actually in the plastic antenna base and
they were sheet metal screws used to secure the aluminum tube to the
plastic, which I don't think could also be used to secure wires to
the tube.




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Did you try to ground both (and at the same time) left and right side of the Al tube, close to the plastic case, to the ground of the coax? Otherwise, grounding as you discribed has indeed little or no effect. The "loop" is in these cases just being formed by the wire that you use to create the ground connection.

Patrick.

Rob Moore <rmoore5@...> wrote: Well, I went out and both grounded the loop to the shell of the BNC
connector and also tried grounding it to a ground rod I had put in
previously. The results were......... No change. I had my G313E
set to pick up WWV on 5000Khz and was doing screen captures in-
between each test and honestly couldn't see any difference, either
in the signal levels or in the noise floor. Nothing, Nada, Nil.
Before you ask, I tried grounding the tube at 45, 90, and 180
degrees and lightly sanded it so a decent connection would be made.

I also checked on the screws because someone here had said that they
had an ALA-1530 and the Aluminum loop had a couple of screws in it
about 2 cm from the loop base. There were no screws or holes to
indicate missing screws either. Hmmm. Either this person was
trying to describe this Antenna from memory or he has some other
kind of loop. I can verify that I have a Wellbrook ALA-1530
(Standard version) that works quite well. (If anyone wants to come
see it or or my ALA-100 setup, you're welcome to come.) The only
screws I could see were actually in the plastic antenna base and
they were sheet metal screws used to secure the aluminum tube to the
plastic, which I don't think could also be used to secure wires to
the tube.

Rob




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I didn't try grounding both side of the aluminum tude but I will in
the next day or so and let you know. I'll have to disassemble more to
see if there are any "amp clamps" in the tube.

Rob

--- In loopantennas@..., Patrick Reynaert <preynaert@...>
wrote:

Did you try to ground both (and at the same time) left and right

side of the Al tube, close to the plastic case, to the ground of the
coax? Otherwise, grounding as you discribed has indeed little or no
effect. The "loop" is in these cases just being formed by the wire
that you use to create the ground connection.

Patrick.

Rob Moore <rmoore5@...> wrote: Well, I went out and both grounded

the loop to the shell of the BNC

connector and also tried grounding it to a ground rod I had put in
previously. The results were......... No change. I had my G313E
set to pick up WWV on 5000Khz and was doing screen captures in-
between each test and honestly couldn't see any difference, either
in the signal levels or in the noise floor. Nothing, Nada, Nil.
Before you ask, I tried grounding the tube at 45, 90, and 180
degrees and lightly sanded it so a decent connection would be made.

I also checked on the screws because someone here had said that they
had an ALA-1530 and the Aluminum loop had a couple of screws in it
about 2 cm from the loop base. There were no screws or holes to
indicate missing screws either. Hmmm. Either this person was
trying to describe this Antenna from memory or he has some other
kind of loop. I can verify that I have a Wellbrook ALA-1530
(Standard version) that works quite well. (If anyone wants to come
see it or or my ALA-100 setup, you're welcome to come.) The only
screws I could see were actually in the plastic antenna base and
they were sheet metal screws used to secure the aluminum tube to the
plastic, which I don't think could also be used to secure wires to
the tube.

Rob




If you've got links, post them in the Links section!


Post files here. If the file comes from a website, please put it in

the Links rather than uploading the file.

You can now view images at higher resolution in Photos. Upload JPG

and GIF into Photos. Please convert BMP or TIF to JPG or GIF before
uploading.

And please trim all this when replying!
Yahoo! Groups Links






---------------------------------
Be a better Heartthrob. Get better relationship answers from someone

who knows.

Yahoo! Answers - Check it out.

[Non-text portions of this message have been removed]

In a message dated 16/05/2007 21:52:33 GMT Daylight Time,
rmoore5@... writes:

Just shorting together the bottom points of the tube where it meets
the base, would cause it to be a shorted turn, which would then
totally disable the antenna, whether or not there wre wires inside of
it, so that's not an option. I think a better test would be to
carefully, with a dremel tool, remove a small window into the tube.
Basically cut a hole in it ald look inside. There might be some
potting compound in there but it should be much trouble to remove that
small an area.

Rob



--------------------
Hi Rob

I really do thing this is a red herring.
I bought my 1530 2nd user with a radio and it was posted to the first user
with the only protection being foam water pipe insulation surrounding the
loop, on a par with the perf board construction I guess.
That might be fine sometimes but in this case the loop got a few knocks and
ended up somewhat dented and distorted.
It still works fine but the point is I can't see how it would have dented if
it was filled with the same potting material as used in the junction box at
the base.
Not only that but I'm sure it would have been quite a bit heavier if that
was the case.

I would expect to see potting material in the ends of the tubes, and would
expect to see wires connecting the tube to the amp, but can't see any reason to
assume the loop isn't the antenna.
That's the norm, so why should this one be any different?

regards

Nigel
GM8PZR

Actually Patrick,

Just shorting together the bottom points of the tube where it meets
the base, would cause it to be a shorted turn, which would then
totally disable the antenna, whether or not there were wires inside of
it, so that's not an option. I think a better test would be to
carefully, with a dremel tool, remove a small window into the tube.
Basically cut a hole in it and look inside. There might be some
potting compound in there but it should be much trouble to remove that
small an area.

Rob


--- In loopantennas@..., Patrick Reynaert <preynaert@...>
wrote:

Did you try to ground both (and at the same time) left and right

side of the Al tube, close to the plastic case, to the ground of the
coax? Otherwise, grounding as you discribed has indeed little or no
effect. The "loop" is in these cases just being formed by the wire
that you use to create the ground connection.

Patrick.

Hi Nigel,

Well, just put it down to intellectual curiosity. I want to
completely understand how the loop works. Having the loop be the
antenna is certainly one answer but that's not what I seem to see when
I look in mine. Short of de-potting a lot more of it (a slow time
consuming process!), cutting a small window in the top of the tube
seems like a good solution.

I'll let you know what I find.

Rob

Hi Rob

I really do thing this is a red herring.
I bought my 1530 2nd user with a radio and it was posted to the

first user

with the only protection being foam water pipe insulation

surrounding the

loop, on a par with the perf board construction I guess.
That might be fine sometimes but in this case the loop got a few

knocks and

ended up somewhat dented and distorted.
It still works fine but the point is I can't see how it would have

dented if

it was filled with the same potting material as used in the junction

box at

the base.
Not only that but I'm sure it would have been quite a bit heavier if

that

was the case.

I would expect to see potting material in the ends of the tubes, and

would

expect to see wires connecting the tube to the amp, but can't see

any reason to

assume the loop isn't the antenna.
That's the norm, so why should this one be any different?

regards

Nigel
GM8PZR






[Non-text portions of this message have been removed]