Topband: Slightly OT - amplifier noise

[Mike Waters]

Steve,
I have an MFJ-1025, and I have never experienced your issues. I was going
to ask some of these questions myself.

I have had very good results indeed with mine for eliminating a single
source of RFI. Something at your end is not right.

Mike,
There have been cases where my 580' Beverage antennas have made a superb
sense antenna. I usually use the W7IUV preamp with the output somewhat
attenuated. Mostly, with the signal antenna being my 75m dipole (with
severe RFI) and a amplified Beverage being the sense antenna.

Every QTH and noise is different, of course. What works for someone else
might not work for you.

73, Mike
W0BTU

On Sat, Mar 14, 2020, 12:46 PM Michael Tope <W4EF at dellroy.com> wrote:

> 2) Is your sense antenna intrinsically inefficient like a beverage or
> K9AY loop or is it something efficient like a tribander up reasonably high?
> 3) Is your sense antenna intrinsically efficient when you include the
> feed line loss (I assume the feedline loss on your main TX antenna is
> very low)?
>
> 73, Mike W4EF............
>
> On 3/14/2020 9:40 AM, n2icarrl at gmail.com wrote:
> >
> > I have an MFJ-1025/1026 noise canceler. I like to use it on the higher
> > HF bands to cancel power line QRN. The noise is typically S3-S4, but I
> > want it down to S0 to hear the bottom layer of stations. My sense
> > antenna works fine, and the QRN is canceled. However, the MFJ-1025
> > amplifier noise is quite significant, often negating the QRN
> > cancellation. The MFJ amplifiers are J310's. Any recommendations for
> > something quieter ?
> >
> > 73,
> > Steve, N2IC
>
>