On Wed, 16 Apr 2008 14:32:36 +0100, "Barrett"
wrote:

If I listen to this band it receives strongest at 28.500 and drops off
sharply after about 300KHz each side along with a rise in SWR It can reduce
a S9 signal down to S1 on both sides.

Hi Barrett,

SWR change within that small a portion of frequency should not affect
receive to the degree you describe.

Is this how the Cobwebb performs or is there some thing wrong with it?

Is it pointed in the right direction? Can you manually tune it?

73's
Richard Clark, KB7QHC

Hi Richard
I have turned it by hand, there is some difference in signal but not much.
The Ariel is 20ft off the ground,, the same as the G5RV.
It doesn't seem to be working right. But I'm not sure how the original
worked.

Thanks


"Richard Clark" wrote in message
...
On Wed, 16 Apr 2008 14:32:36 +0100, "Barrett"
wrote:

If I listen to this band it receives strongest at 28.500 and drops off
sharply after about 300KHz each side along with a rise in SWR It can
reduce
a S9 signal down to S1 on both sides.

Hi Barrett,

SWR change within that small a portion of frequency should not affect
receive to the degree you describe.

Is this how the Cobwebb performs or is there some thing wrong with it?

Is it pointed in the right direction? Can you manually tune it?

73's
Richard Clark, KB7QHC

On Wed, 16 Apr 2008 19:51:25 +0100, "Barrett"
wrote:

I have turned it by hand, there is some difference in signal but not much.
The Ariel is 20ft off the ground,, the same as the G5RV.
It doesn't seem to be working right. But I'm not sure how the original
worked.

Hi Barrett,

That is line of sight, easily. As you suspect, you should hear your
friends. Your turning it is OK. Your SWR readings would suggest your
line is OK, your antenna is OK. Aside from using a manual tuner (you
say nothing to my question there), that leaves the receiver as being
suspect.

73's
Richard Clark, KB7QHC

Hi Richard

I have a manual tuner and two auto tuners that I have used and it makes no
difference to improve the received signal. I have also used two different
radios with the same outcome.
I'm wondering if the G5RV is to close and is causing this or if the square
10"x10" mounting plat that I have used in the centre of the Cobwebb might be
causing the problem.

The G5RV is at the same height as the homebrew Cobwebb and they are about
15ft apart. All other bands do not sharply drop off like 28MHz does on
receive signals.

Thanks


"Richard Clark" wrote in message
...
On Wed, 16 Apr 2008 19:51:25 +0100, "Barrett"
wrote:

I have turned it by hand, there is some difference in signal but not much.
The Ariel is 20ft off the ground,, the same as the G5RV.
It doesn't seem to be working right. But I'm not sure how the original
worked.

Hi Barrett,

That is line of sight, easily. As you suspect, you should hear your
friends. Your turning it is OK. Your SWR readings would suggest your
line is OK, your antenna is OK. Aside from using a manual tuner (you
say nothing to my question there), that leaves the receiver as being
suspect.

73's
Richard Clark, KB7QHC

On Wed, 16 Apr 2008 21:37:56 +0100, "Barrett"
wrote:

Hi Richard

I have a manual tuner and two auto tuners that I have used and it makes no
difference to improve the received signal. I have also used two different
radios with the same outcome.
I'm wondering if the G5RV is to close and is causing this or if the square
10"x10" mounting plat that I have used in the centre of the Cobwebb might be
causing the problem.

The G5RV is at the same height as the homebrew Cobwebb and they are about
15ft apart. All other bands do not sharply drop off like 28MHz does on
receive signals.

Thanks

Hi Barrett,

One other thing that comes to mind is you may be cross-polarized,
which for line of sight transmission (and this close proximity so
qualifies) can exhibit substantially depressed signals.

This would mean that your Cobwebb homebrew is very much horizontally
polarized, and that your G5RV has enough slope to it to be
sufficiently vertical to your buddie's vertical signals.

I will let you sort out the particulars - like the buddies are also
vertical (if not, well, there goes that theory).....

73's
Richard Clark, KB7QHC

Hi Richard

You might have the answer there. I will ask my friends tomorrow what Ariel's
there using. The G5RV is a homebrew half size with 300ohm vertical feeder
straight into 50ohm coax that has a coax Air Core Choke Ugly Balun in it.

Thanks


"Richard Clark" wrote in message
...
On Wed, 16 Apr 2008 21:37:56 +0100, "Barrett"
wrote:

Hi Richard

I have a manual tuner and two auto tuners that I have used and it makes no
difference to improve the received signal. I have also used two different
radios with the same outcome.
I'm wondering if the G5RV is to close and is causing this or if the square
10"x10" mounting plat that I have used in the centre of the Cobwebb might
be
causing the problem.

The G5RV is at the same height as the homebrew Cobwebb and they are about
15ft apart. All other bands do not sharply drop off like 28MHz does on
receive signals.

Thanks

Hi Barrett,

One other thing that comes to mind is you may be cross-polarized,
which for line of sight transmission (and this close proximity so
qualifies) can exhibit substantially depressed signals.

This would mean that your Cobwebb homebrew is very much horizontally
polarized, and that your G5RV has enough slope to it to be
sufficiently vertical to your buddie's vertical signals.

I will let you sort out the particulars - like the buddies are also
vertical (if not, well, there goes that theory).....

73's
Richard Clark, KB7QHC

On Apr 17, 12:05*am, "Barrett" wrote:
Hi Richard

You might have the answer there. I will ask my friends tomorrow what Ariel's
there using. The G5RV is a homebrew half size with 300ohm vertical feeder
straight into 50ohm coax that has a *coax Air Core Choke Ugly Balun in it.