|Customer Reviews for the MFJ-1024.|
|From: Steve N4LQ|
|Living in the big city we have several strong AM broadcast stations that completely overloaded the 1024 even with the whip collapsed. The cure was to cut one lead on each of the 2 input protection diodes. Diodes on the input of an RF amplifier cause terrible IMD. MFJ even tried reverse biasing these diodes but it's not enough. These were 5kw stations about 4 miles away. |
Also this unit should be grounded. Either a metal mast should be used and it should be grounded at the base or the coax should be grounded before it goes into the house. This does not require a fancy ground, just a 4' rod will suffice. This will greatly reduce noise pickup.
Finally, the whip antenna works but I found that a 1" wide piece of double sided circuit board about 5" long made a better antenna. This idea came from the so called "mini-whip" design. The antenna acts as a capacitor.
The control box is nice because it has the gain pot and padder which allows you to control the injection to your radio however it does not control the actual gain of the outdoor unit.
Quality control is an issue. When mine arrived, all 4 bolts holding the outdoor unit were loose and flopping around. The antenna mount was loose and 2 nuts for the circuit board were missing. These were an easy fix of course.
I installed a nice SO-239 coax jack on the bottom so I can now disconnect the outdoor unit when needed. I also re-drilled mounting holes for the box so I could move it up higher, to the edge of the plate which allows the antenna to extend above the plate. You don't want the antenna below the plate.
I also drilled holes for larger U bolts, 2". Those holes should have been slotted for various size u bolts anyway.
The mosfet used in the antenna has internal diode protection. I hope it's enough. So far with my transmit antenna about 50 feet away, no problem. The diode idea MFJ used would be great but just isn't practical if you live anywhere near a BC station.
I've been using this as both a diversity antenna with my horizontal wire antenna. The 1024 favors vertical polarization. Also I've been using it as the noise pickup antenna for my MFJ-1026. This makes a great pair.
73 Steve N4LQ
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