Dave Oldridge wrote:

Sun Tzu wrote in
news:_rCdndMY26mGEqLYnZ2dnUVZ_oOdnZ2d@hawaiiantel. net:

I use an Timewave ANC-4 to reduce noise on the low bands at my
location. On 40 & 160 meters I can reduce the noise almost to S1, but
on 75 meters I can only reduce it to S4-5.
I use a noise sense antenna which is a dipole 4ft on each side about 4
inches off the ground and parallel to the power and telephone lines.
Anyone have one of these units and having any ideas I might try to
reduce 75 meters to a lower S-meter reading?

All my low band antennas are verticals.

You might try using a vertical whip for the ANC-4. I use the built-in one
on my MFJ-1026. Even so, you may just be experiencing general ionospheric
noise at that level if your antenna is fairly good.

Is your QTH urban or rural? Here in urban downtown Chilliwack, BC, I get
a lot of noise sources and, of course, the 1026 can really only take out
the loudest single source.




I guess its residential on 1/3 of an acre lots. Not real tight.
But the utilities are above ground and that probably doesnt help.

In article ,
Sun Tzu wrote:

Dave Oldridge wrote:

Sun Tzu wrote in
news:_rCdndMY26mGEqLYnZ2dnUVZ_oOdnZ2d@hawaiiantel. net:

I use an Timewave ANC-4 to reduce noise on the low bands at my
location. On 40 & 160 meters I can reduce the noise almost to S1, but
on 75 meters I can only reduce it to S4-5.
I use a noise sense antenna which is a dipole 4ft on each side about 4
inches off the ground and parallel to the power and telephone lines.
Anyone have one of these units and having any ideas I might try to
reduce 75 meters to a lower S-meter reading?

All my low band antennas are verticals.

You might try using a vertical whip for the ANC-4. I use the built-in one
on my MFJ-1026. Even so, you may just be experiencing general ionospheric
noise at that level if your antenna is fairly good.

Is your QTH urban or rural? Here in urban downtown Chilliwack, BC, I get
a lot of noise sources and, of course, the 1026 can really only take out
the loudest single source.




I guess its residential on 1/3 of an acre lots. Not real tight.
But the utilities are above ground and that probably doesnt help.

not sure if anyone realizes this but i've noticed that the adj controls
can sometimes be very very sensitive sometimes i've found that a hair
kills the noise and if you blinked at that moment you missed it

dunno maybe it's just me

ml wrote:

In article ,
Sun Tzu wrote:

Dave Oldridge wrote:

Sun Tzu wrote in
news:_rCdndMY26mGEqLYnZ2dnUVZ_oOdnZ2d@hawaiiantel. net:

I use an Timewave ANC-4 to reduce noise on the low bands at my
location. On 40 & 160 meters I can reduce the noise almost to S1, but
on 75 meters I can only reduce it to S4-5.
I use a noise sense antenna which is a dipole 4ft on each side about 4
inches off the ground and parallel to the power and telephone lines.
Anyone have one of these units and having any ideas I might try to
reduce 75 meters to a lower S-meter reading?

All my low band antennas are verticals.

You might try using a vertical whip for the ANC-4. I use the built-in
one
on my MFJ-1026. Even so, you may just be experiencing general
ionospheric noise at that level if your antenna is fairly good.

Is your QTH urban or rural? Here in urban downtown Chilliwack, BC, I
get a lot of noise sources and, of course, the 1026 can really only
take out the loudest single source.




I guess its residential on 1/3 of an acre lots. Not real tight.
But the utilities are above ground and that probably doesnt help.

not sure if anyone realizes this but i've noticed that the adj controls
can sometimes be very very sensitive sometimes i've found that a hair
kills the noise and if you blinked at that moment you missed it

dunno maybe it's just me

maybe you have a bad or dirty control? OR as Jan wrote previously the
variable resistor is not linear and the abrupt change you see it due to the
variable resistor.

I guess its residential on 1/3 of an acre lots. Not real tight.
But the utilities are above ground and that probably doesnt help.

not sure if anyone realizes this but i've noticed that the adj controls
can sometimes be very very sensitive sometimes i've found that a hair
kills the noise and if you blinked at that moment you missed it

dunno maybe it's just me

maybe you have a bad or dirty control? OR as Jan wrote previously the
variable resistor is not linear and the abrupt change you see it due to the
variable resistor.

the control is good, it is on all the units prob a non linear
pot(resistor) linear taper? not audio taper or what ever but they all
seem to work like that

on certain kinds of noise it sure works well

ml

"ml" schreef in bericht
...




I guess its residential on 1/3 of an acre lots. Not real tight.
But the utilities are above ground and that probably doesnt help.

not sure if anyone realizes this but i've noticed that the adj controls
can sometimes be very very sensitive sometimes i've found that a
hair
kills the noise and if you blinked at that moment you missed it

dunno maybe it's just me

maybe you have a bad or dirty control? OR as Jan wrote previously the
variable resistor is not linear and the abrupt change you see it due to
the
variable resistor.

the control is good, it is on all the units prob a non linear
pot(resistor) linear taper? not audio taper or what ever but they all
seem to work like that

on certain kinds of noise it sure works well

The phase control variable resistor is linear, but the relation between
phase
difference and resistor value is very non linear!
This makes it difficult to tune to the exact phase for deep noise
cancelling.
See: http://www.pa0sim.nl/Phaser%2080%20-%2010%20meters.htm

That is why I use phase (and gain) control spreading.

73 Jan PA0SIM