bpnjensen wrote:
Ron Hardin wrote:
The ANC-4 works on MW, whereas you have to remove filter from the
MFJ to do that.

To be very clear, the MFJ *does* work on MW even with the filter, when
your goal is to remove noise. What the MFJ also does, because of the
filter, is to attentuate the MW freqs, which may not be desirable. I
do not do a lot of MW, but when I do, the MFJ is also effective at
nipping the offending MW stations to get at the weaker ones underneath.

It's a shame that MFJ didn't design the circuit to allow the filter to
be switched in when required. I'm in the southern part of Edmonton and
that just happens to be the locale for most of the MW transmitters
around here. I do get some bleed over into a few of the shortwave
frequencies.


Count on working with 2 real antennas, not the fake noise stub one.
You'll find it much more versatile.

Agreed. It really helps if the two antennas are equivalent in terms of
ability to "hear" noise. A wire may not be the same as a Wellbrook,
consideirng their significant design differences.

I will say, though, that the little stub antenna on the MFJ was fairly
effective as a noise antenna in the 60-m band. That may have been a
fluke of the local RFI situation.

The stub works well enough for most local noise. If you want to null out
a distant MW station then it's time for an outdoor antenna.


I have 7 ANC-4's and no MFJ's, on 8 antennas, 2 of them Wellbrook
ALA1530's.

Chief complaint is that the pots get scratchy pretty quick,
because scratchiness is in effect amplified by the null depth ;
fixed with a squirt of deoxit in the 2 tiny holes at the bottom of
each pot (careful you don't get any in your eyes).

This fix works on the MFJ as well. Squirt and twist a few times and
you're set.

Second complaint is that the circuit really needs a bandspread pot
on the phase, as you're into really tiny tiny adjustments at the
bottom of a deep null.

That would be nice on the MFJ as well. One other issue is that so much
of the noise seems to null at the very same place on the pot's
rotation, and that portion of the pot gets scratchy fast.

Do you have the mod that allows for swapping the antenna inputs? This
will help with achieving nulls.

Bruce Jensen

This would be chiefly from taking out a local broadcaster to hear
the broadcaster under him.

--
Ron Hardin


On the internet, nobody knows you're a jerk.



JB