Finished up Skywarn Recognition Day yesterday, had a good time, as usual.
Had a continuing and ongoing problem however.
One of our antennas is a trap dipole that the weather service hangs from a
tower for us.
We bring our 3 element beam on a trailer.
The beam has no problems on 10-15-20, works fine.
The trap dipole works good on all bands but 80 meters.
We have so much noise it is just about worthless.
We have tried turning off as much equipment as possible in the weather
station with no success.
So - there is something that is causing the problem - but - whatever it is
we can not shut it down.
Any suggestions for a good in line RF filter for 80 meters that may help
eliminate noise?
Open to any all suggestions from homebrew to a good reliable manufactured
filter.
Any and all suggestions would be appreciated.

Sam - K7SAM
WX7GGW - Skywarn

the first thing you have to do is to find out the source, and then determine
if the noise is being radiated or not. if it is being radiated from some
piece of equipment then a line filter won't do you any good. so either keep
turning stuff off, or get a handheld receiver to sniff around until you find
he source. or just try listening with a mobile rig just outside the
building, if you hear the noise on that then the line filter won't help.

"Topaz305RK" wrote in message
...
Finished up Skywarn Recognition Day yesterday, had a good time, as usual.
Had a continuing and ongoing problem however.
One of our antennas is a trap dipole that the weather service hangs from a
tower for us.
We bring our 3 element beam on a trailer.
The beam has no problems on 10-15-20, works fine.
The trap dipole works good on all bands but 80 meters.
We have so much noise it is just about worthless.
We have tried turning off as much equipment as possible in the weather
station with no success.
So - there is something that is causing the problem - but - whatever it is
we can not shut it down.
Any suggestions for a good in line RF filter for 80 meters that may help
eliminate noise?
Open to any all suggestions from homebrew to a good reliable manufactured
filter.
Any and all suggestions would be appreciated.

Sam - K7SAM
WX7GGW - Skywarn

The trap dipole works good on all bands but 80 meters.
We have so much noise it is just about worthless.
We have tried turning off as much equipment as possible in the weather
station with no success.
So - there is something that is causing the problem - but - whatever it is
we can not shut it down.
Any suggestions for a good in line RF filter for 80 meters that may help
eliminate noise?
Open to any all suggestions from homebrew to a good reliable manufactured
filter.
Any and all suggestions would be appreciated.

Sam - K7SAM
WX7GGW - Skywarn

First, I would check that antenna against a plain ol' dipole to make sure
its not the antenna.
(Or use a portable AM radio to check for local noise.)
If the plain dipole exhibits a noiseless reception, then throw out the trap
dipole.

Any Algore fluorescent lightbulbs around? If so, throw them away. If the
noise is generated within the band, no filters on the antenna would help,
need to suppress it at the source.
Get small AM radio and trace it.

Yuri, K3BU.us


"Topaz305RK" wrote in message
...
Finished up Skywarn Recognition Day yesterday, had a good time, as usual.
Had a continuing and ongoing problem however.
One of our antennas is a trap dipole that the weather service hangs from a
tower for us.
We bring our 3 element beam on a trailer.
The beam has no problems on 10-15-20, works fine.
The trap dipole works good on all bands but 80 meters.
We have so much noise it is just about worthless.
We have tried turning off as much equipment as possible in the weather
station with no success.
So - there is something that is causing the problem - but - whatever it is
we can not shut it down.
Any suggestions for a good in line RF filter for 80 meters that may help
eliminate noise?
Open to any all suggestions from homebrew to a good reliable manufactured
filter.
Any and all suggestions would be appreciated.

Sam - K7SAM
WX7GGW - Skywarn

Yuri Blanarovich wrote:
Any Algore fluorescent lightbulbs around? If so, throw them away. If the
noise is generated within the band, no filters on the antenna would help,
need to suppress it at the source.
Get small AM radio and trace it.

Yuri, K3BU.us

Oh, most surely, the problem is so simple! chuckle

Krist, all will surely know an am radio will be real responsive to all
interfering signals, EVEN TO GHZ cough!

JS

Oh, most surely, the problem is so simple! chuckle

Krist, all will surely know an am radio will be real responsive to all
interfering signals, EVEN TO GHZ cough!

JS

cough cough The OP stated his problem was static on the 80 meter band, not
interference, and not in GHZ range.
So with those parameters, I suggest the portable AM radio may be quite
effective at detecting noise on the 80 meter band. I'm sure you will agree
with that. You may have misread my post.
But we still love ya!