[Top] [All Lists]

Re: [TowerTalk] You think you have line noise !

To: 'Gedas' <>
Subject: Re: [TowerTalk] You think you have line noise !
From: Paul Kelley N1BUG <>
Date: Sat, 16 Dec 2006 06:48:00 -0500
List-post: <>
> But, in the meantime, has anyone here had any experience with devices like
> the MFJ-1025?  Are these things worth anything and do they work as
> advertised?

I recently purchased an MFJ-1026 in an effort to fight power line 
noise. It takes a little while to get used to adjusting the 
controls, but the unit does an amazing job of nulling a single 
noise. If you have noise from multiple sources, it won't be able to 
null more than one at a time.

I might add, however, the MFJ likes a low impedance load because of 
its emitter follower output stage. It has trouble delivering power 
into higher impedances. When used with my HF rig, the unit shows ~30 
dB loss and is totally useless. When tried with borrowed rigs all is 
well. I am led to believe, therefore, that my rig has a receiver 
input impedance the MFJ doesn't like. Whether by design or this 
particular rig is broken has yet to be determined. It would be 
interesting to know if anyone else has found an MFJ-1025 or 1026 to 
dislike a particular rig in this manner.

Paul N1BUG


TowerTalk mailing list

<Prev in Thread] Current Thread [Next in Thread>