We'll be moving to southern Arizona.

I'd like to continue MW-DX
without interference from Mexican AM transmitters.

Is there any way to set up an outside antenna
to receive "from the north" only ?

For loopstick radios,
I was thinking of a grounded metal plate
on the back of the radio....

I don't think a loop would work for this application...

Any other ideas on blocking directional interference ?

rj

"RJ" wrote:
We'll be moving to southern Arizona.

I'd like to continue MW-DX
without interference from Mexican AM transmitters.

Is there any way to set up an outside antenna
to receive "from the north" only ?

Not easily. A phased vertical array with a cardiod pattern could give a
sharp null in one direction, but is not practical for a backyard
installation.

For loopstick radios,
I was thinking of a grounded metal plate
on the back of the radio....

Remember, the signal is coming in off the ionosphere at a pretty high angle.

I don't think a loop would work for this application...

I think it might if you could steer the loop to notch out the offending
station.

Art N2AH

Not easy with a portable radio with a built in rod antenna. Simply move the
radio for best reception.

For radios using an external antenna (and preferrably with an S meter), you can
phase just about any two antennas together to get a steerable, unidirectional
pattern. I can throw out two 100 ft pieces of wire on the ground and null local
'super pest' 1290khz (5 kw and 3 miles away) down enough to hear stations under
at night.

Take a look at this:

http://www.qsl.net/wa1ion/index.html

Read some of the articles and get a feeling for what you can do, especially the
"broad band phasing" unit (scroll down a bit).

Questions?

Ask here !

jw
K9RZZ
Milwaukee