[600MRG] Noise cancelers

[Kenneth G. Gordon]

On 23 Sep 2013 at 10:06, Rudy Severns wrote:

> A couple of years ago I ran some tests on the MFJ-1026 and the ANC-4
> noise cancellers.  The tests were done on the bench using a VNA to
> accurately measure the nulling capabilities.  For frequencies of 1.5
> MHz and up both worked pretty good but when I went down to 475 kHz the
> MFJ performed poorly but the ANC was still good.  I looking inside
> both boxes and it appeared to me the problem with the MFJ was the
> transformers were not designed for the low frequency.  The cores were
> pretty small with not all that many turns.
> 
> George, W2VJN, is going to lend me his ANC-4 again so I can see if it
> will help in my situation.  I'll report back.

Isn't the ANC-4 sold by TimeWave? If so, and from what I understand, since 
one channel is tied to the short active antenna and has essentially too much 
gain, it has an overload problem that the 1026 (despite is "MFJ" style crappy 
construction) after modification doesn't?

I also found another link yesterday by a fellow who replaced the crappy, 
wimpy pots in the '1026 with much higher-quality ones. I'll try to find that and 
post it here.

Ken W7EKB