Topband: QRM Eliminator

[Roger Kennedy]

This circuit is clearly MUCH simpler than the MFJ units, which uses matching
transformers and has several extra stages.

Personally, I would find it annoying that the gain isn't unity through the
unit. 

ALSO - I bought a secondhand MFJ-1025 for about $70 . . . but found that I
needed to add a 2-stage preamp for the Noise antenna (which the 1026 has) -
but this is easy as the 1025 uses the same PCB as the 1026, so I just built
it onto the pcb, using MFJ's design.

Roger G3YRO


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Re: Topband: QRM Eliminator

[Pete Smith N4ZR]

Funny (I guess) - we have Chinese manufacturers cloning a Russian design.

73, Pete N4ZR
Check out the new Reverse Beacon Network
web server at.
For spots, please use your favorite
"retail" DX cluster.

On 10/9/2022 12:35 PM, K4SAV wrote:
This link shows a schematic of this thing. (Assuming it's the same as 
the packaged version.)

https://tinyurl.com/3pkvzdft

Jerry, K4SAV

On 10/9/2022 10:59 AM, Tree wrote:

Looks like there is a low cost version of the ANC-4 and MFJ-1026 type of
noise eliminator available on Amazon of all places.

Search for QRM Eliminator.  Cost is around $60.

These are useful if you have a single point noise source.   I do not 
have
one of these units but was "reading the mail" on someone talking 
about it

on 40M SSB and they seemed to think it worked well.

And he had a good point - if you don't like it - you can send it back 
for a

full refund!

Tree N6TR
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Re: Topband: QRM Eliminator

[Martin Kratoska]

Nothing against NCC phasers but I would try the PA0SIM phaser

http://www.pa0sim.nl/Phaser%2080%20-%2010%20meters.htm

before making any decisions. It can be better than any NCC, assumed that 
the amplifier on the output has fairly low input impedance and excellent 
IM properties. At least, you can get a  phaser good on 10 MHz and 
above... It is always matter of experiment!


73,
Martin, OK1RR

Dne 09. 10. 22 v 20:58 Jim Brown napsal(a):

On 10/9/2022 11:22 AM, John Pieszcynski wrote:
He also has reviews and comparisons of other RFI fighting products on 
his

web site.


As part of project to document the performance of a pair of phased 
VE3DO loops for 160M, I did extensive bench testing and engineering 
analysis of the DX Eng NCC-1. It's published here. It's a very high 
quality product, very effective below 20M, not much above.


http://k9yc.com/VE3DO.pdf

73, Jim K9YC


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Re: Topband: QRM Eliminator

[Pete Smith N4ZR]

That's amazing - there are at least 10 different listings on Amazon, 
ranging from $54 to $70.  They all appear to be the same box,.


73, Pete N4ZR
Check out the new Reverse Beacon Network
web server at.
For spots, please use your favorite
"retail" DX cluster.

On 10/9/2022 11:59 AM, Tree wrote:

Looks like there is a low cost version of the ANC-4 and MFJ-1026 type of
noise eliminator available on Amazon of all places.

Search for QRM Eliminator.  Cost is around $60.

These are useful if you have a single point noise source.   I do not have
one of these units but was "reading the mail" on someone talking about it
on 40M SSB and they seemed to think it worked well.

And he had a good point - if you don't like it - you can send it back for a
full refund!

Tree N6TR
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