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Author Topic: MFJ-1026 Question  (Read 1069 times)
AA5HP
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Posts: 53




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« on: April 02, 2007, 03:13:52 PM »

Years ago I built a homebrew Noise eliminator. I believe it was called a QRN Smasher. The article appeared in CQ Magazine and was designed by Doug DeMaw.
I played with it and noticed that the desired signal underneath the power line noise seemed to degrade along with the power line noise.
I could never seem to lose the noise without degrading the strength of the desired signal. I played with both the phase and balance controls.
Has anyone successfully used the MFJ-1026 to eliminate power line noise without lowering the signal strength of the desired signal?
Thanks for the help.
Joe AA5HP
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WA9UAA
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Posts: 314




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« Reply #1 on: April 05, 2007, 11:45:27 AM »

Hi Joe,
I have an MFJ 1026 and have finally found a real need. I have really bad noise from 160 M to 20 M. What is not stressed enough is the noise receiving antenna. I put up a small loop in my shack, hung from the ceiling near the walls. (40 ft in length.) the loop feeds the balanced input of a small tuner, which feeds the noise input of the MFJ 1026. This allows me to tune for maximum noise before adjusting the noise gain. It works best on 40 M. The antenna is too short for 80 M i.e. it doesn't pick up enough noise, by the time I get up to 20 M the two antennas hear different noise sources. On 40 M it will give me 3-4 "S" units of relief. It does take some practice, I use the 'S' meter on my Pro II for setting levels. Even with in a band I will have to re-tune occasionally. Finally, I use the relay control in the rig to switch the 1026 in and out of line and I put a disconnect relay on the noise input to protect it's front end from the TX signal. I had never been in a high noise environment before and this device made all the difference.
73,
Rob WA9UAA
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