Thank you.

I think it may be a common mode problem. There is no choke on the
dipole. I will bring it closer to resonance.

- Dan kb0qil

Richard Clark wrote:
On Sun, 25 Feb 2007 07:14:54 -0800, dansawyeror
wrote:
resonates at about 7.7 MHz.
On low power the tuner creates a very low SWR.
according to the SWR Watt meter the system
appears to transmit well over 200 watts.
When it is transmitting the SWR reads about 1.1 to 1.

Hi Dan,

The Meter is either not as good as you claim it to be (it doesn't
accurately perform at low power); OR
you have common mode problems (classic).

Do you choke the dipole?

73's
Richard Clark, KB7QHC

dansawyeror wrote:
I think it may be a common mode problem. There is no choke on the
dipole. I will bring it closer to resonance.

Dan, are you measuring that power on the input or
output of the tuner? If at the output of a transceiver
with autotuner, for instance, the forward power is
the sum of the transmitter power and reflected power.
--
73, Cecil http://www.w5dxp.com

On Mon, 26 Feb 2007 08:10:49 -0800, dansawyeror
wrote:

I think it may be a common mode problem. There is no choke on the
dipole. I will bring it closer to resonance.

Hi Dan,

One very simple test is to fire up your rig and note the SWR. Patch
in a short, loose length of transmission line to the existing run
(about an eighth wave) and fire up the rig again.

Did the SWR change?

If so, you are being SWR whipped by Common Mode currents.

You can keep introducing different lengths of line until you find 1:1
(unlikely, but perhaps close) and let it go at that. This will be a
single frequency solution, but take care that it does NOT cure Common
Modality. Instead, it adds a vertical component to your transmission
(maybe).

This is not always good as that same transmission line (plus
extension) may run past RF sensitive devices (like intercoms, VCRs,
light dimmers, etc.) that go whacko. It may also fill in the nulls of
your dipole (sometimes good, sometimes bad).

73's
Richard Clark, KB7QHC