The ANC 4 has a RF sensor for switching...if you operate QRP or drive an
amplifier with less than 100 watts there is a potential for the ANC-4 to not
switch over which will cause the sensitive noise reduction circuits to be
fried by the low power HF entering the unit from you transceiver.
There is a minor mode that allows the unit to be switch from the transceiver
PTT line which then allows for QRP or lower than 100 watt operation.
Good little units. I've even run them in series to address RFI from
different noise sources.
[mailto:firstname.lastname@example.org] On Behalf Of George Gorsline VE3YV
Sent: Thursday, April 24, 2008 1:54 PM
Subject: [TowerTalk] Noise Canceler Hookup
Peter - it`s easier than that - the Mark-V has all of the connections
needed for you to use it without having the MFJ unit TR switch. See the
following diagram which is for another unit, but the connections are the
same. It takes a couple of minutes to follow it - not as intuitive as
you might think (or I was having a dense day). With this in place, to
use the noise canceler, just push the RX antenna button.
Date: Thu, 24 Apr 2008 10:33:57 -0400
From: Peter Dougherty <email@example.com>
Subject: [TowerTalk] MFJ 1026 power handling, etc
Content-Type: text/plain; charset="us-ascii"; format=flowed
I've got a couple of questions for anybody who's used an MFJ 1026 (or
I've got some nasty power line noise on a few bands (that someday
PSE&G may look into). I'm using an MFJ 1026 on my K9AY loop, using a
simple wire sense antenna for the differential input and it works
reasonably well. Now I'm thinking about tackling the problem on 12,
17 and 20 as well, and to do that, I'll need to run my TX line
through the 1026.
The problem is, I'm using an FT-1000 MP Mark V with 200W out - and
according to the manual for the 1026, it's only rated 100W. I
typically drive my AL-1200 amp with about 110-115 Watts, and when I
run barefoot (and when I operate on 30m), I usually run the full 200W
output from the radio.
Has anyone ever successfully used one of these noise-cancellers at
greater-than-100W and had it survive? If that's not an option, as I
suspect is the case, is there any way for me to get the
noise-cancelling ability of a 1026 (or similar) and still run my Mark
I also had another thought. Could I put my K9AY loop on one side of
the 1026 and my TX antenna line to the other side and essentially use
one as a noise sense while operating on the other, or should I get a
73, George VE3YV / K8HI
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