Topband: MFJ-1026 or ANC-4
Pete Rimmel
k8unp@shadow.net
Mon, 02 Aug 1999 11:26:29 -0700
I use the ANC-4 very successfully on 160 M. I had at one time a nouse
20 over S-9 which I was able to get down to about S-2 with the noise
canceller... Later was able to eliminate the noise - A pole pig
transformer on the AC lines 3 blocks away.
However it did work VERY WELL to eliminate the noise.
I understand the MFJ works well too.
I use a PVC octagonal loop helically wound with 240 Turns No 26 enamel
wire and a tuned circuit for the noise antenna... I get it to resonate
with a 120 pf trimmer in series with the coil and a 120 pf trimmer in
series with the 50 Ohm coax to the ANC-4. It tunes to resonance and can
be rotated with armstrong or TV rotor.
Pic of the loop arrangement - all 1/2" PVC pipe and fittings below:
1 2
_________________
12 / | \ 3
/ | \
| | |
11 | | | 4
|---------+---------| <- tee & cross in middle
| | | 5
10 | | |
\ | / <-- 45 deg angle
9 \________|________/ 6
<-- 45 deg angle
8 7
All 12 sections of PVC are 12" long . I feed it at the bottom center
with a small
piece of perf board used to mount the 2 120 pf trimmers and a SO-239
Coax connector.
Hope this helps.
73 Pete N8PR
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