Looking for advice on CAP/MARS antennas
 

On Tue, 07 Aug 2007 08:47:33 -0700, Richard Clark wrote:

On Tue, 07 Aug 2007 09:49:45 -0400, "Rick (W-A-one-R-K-T)"
wrote:

He reported the faraway
station as weak but readable, and I was receiving it loud and clear, about
10 over S9.

Hi Rick,

The difference is called propagation, and you have the advantage of
being in line-of-sight. Even a Christmas tree bulb can communicate
that far at those antenna heights.

Good afternoon, Richard.

I guess I wasn't clear. Stations A (me) and B are 10 miles apart.
Station C is 90 miles from both stations A and B, broadside to a line
between stations A and B. Station A runs a cut dipole at 17 feet and
Station B runs a B&W at 25 feet. Station C comes in weak at Station B
(with the B&W) but strong at Station A (with the cut dipole).

I suppose that propagation between Stations C and A will be different than
between C and B, but usually not that different...

Looking for advice on CAP/MARS antennas
 

On Tue, 07 Aug 2007 17:01:53 -0400, "Rick (W-A-one-R-K-T)"
wrote:

I guess I wasn't clear.

Hi Rick,

Quite so by the lengthier description offered.

I suppose that propagation between Stations C and A will be different than
between C and B, but usually not that different...

It would be a curious exception, indeed.

I can imagine the difference in A/B received signal strengths is found
in the tuner at A.

73's
Richard Clark, KB7QHC

Looking for advice on CAP/MARS antennas
 

On Tue, 07 Aug 2007 18:16:11 -0700, Richard Clark wrote:

I can imagine the difference in A/B received signal strengths is found
in the tuner at A.

Ah, but "A" is me, and my dipole is cut for the frequency ... no tuner
involved. The 10-mile-away station with the B&W also has no tuner. So,
tuners don't enter into the picture for this particular test.

Looking for advice on CAP/MARS antennas
 

On Wed, 08 Aug 2007 00:36:49 -0400, "Rick (W-A-one-R-K-T)"
wrote:

On Tue, 07 Aug 2007 18:16:11 -0700, Richard Clark wrote:

I can imagine the difference in A/B received signal strengths is found
in the tuner at A.

Ah, but "A" is me, and my dipole is cut for the frequency ... no tuner
involved. The 10-mile-away station with the B&W also has no tuner. So,
tuners don't enter into the picture for this particular test.

Ah², but the sense of tuner is found in "tuned" (as in "my dipole is
cut for the frequency").

73's
Richard Clark, KB7QHC

Looking for advice on CAP/MARS antennas
 

Rick (W-A-one-R-K-T) wrote:
I'm quite active in CAP and MARS and so I need to be able to operate on a
fairly long list of frequencies between about 2.2 MHz and about 27 MHz
(actually up to 24 MHz would probably be OK, not much goes on above there).


Actually, almost any antenna with a 5 dB attenuator would work. a 5 dB
pad would give you a return loss of -10dB, which is around 1.9:1 VSWR..

According to Cebik's models, the T2FD is down about 6 dB relative to a
dipole, worst case, so it would be almost the same.

All you need to do is build yourself a BIG 6dB attenuator that can
dissipate the power.