[600MRG] Noise cancelers

[Joe K I 5 F J]

I have been using the MFJ for over 10 years
with excellent results. 
When the PL Buzz appears (160-30M),
the null reduces the Buzz significantly.
 
The aux channel is fed by a 60-M 
Sloping Inverted Vee.
The main antenna is either a 50 Ft vertical
or a 160-M Horizontal loop.
 
My procedure is to first set AGC to SLOW.
Set the aux gain to zero, main gain near max,
observe the S-Meter indication.
Turn the main gain to zero, Adjust the aux gain
to equal the main S-Meter reading.
Return the main gain to the original value, near max.
 
Adjust the phasing for the null.
Fine tune the null depth with slight gain adjustments.
The aux gain set is nearly always near max.
 
73
Joe O,   K I 5 F J
NNNN
 
 

 

________________________________
From: Kenneth G. Gordon <kgordon2006 at frontier.com>
To: Rudy Severns <n6lf at arrl.net> 
Cc: 600m group <600mrg at w7ekb.com> 
Sent: Monday, September 23, 2013 12:49 PM
Subject: Re: [600MRG] Noise cancelers


On 23 Sep 2013 at 11:14, Rudy Severns wrote:

> We'll have to see how the mods work.

Yes. I am, most certainly, going to try them as soon as I can come up with a '1026

>  Right now the noise is killing any 
> chance to hear the gang, even the WSPR signals.

That is my situation here also.

>  I'll be putting up a 
> dedicated receiving antenna but that's down the road.  In the meantime I 
> have my big antenna up and can put up a sense vertical easily if needed. 
> Besides the noise problem I have 120 mV rms of BC signals coming out the 
> spigot!

Sheesh! Well, we do have a BC station within a mile or so of us, but it is a fairly low power 
job. It is on 1450 KHz too, which probably helps, and it drops to 250 watts at night.

>  The first priority is to build a really good filter and then the 
> 1026 mods.  I may have to build two filters, the second one on the sense 
> antenna????

Possibly...yes.

> I have a real challenge here but I think it may be a lot of fun and a great 
> learning experience solving it.  If you're a fanatic there's a lot that can 
> done!

Hmmmm....you sound like someone related to me... :-)

Ken W7EKB /24

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