MFJ-936B Loop Tuner, 5.3 - 30MHz, 150W, w/Current/SWR/Watt
SKU:
ZMF-936B
Availability:
Out of stock
This item is Out of Stock, Consider the MFJ-936C Deluxe High Efficiency Magnetic Loop Tuner
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Customer Reviews
Overall
4
Well suited for intended purpose
Review by
Michael
I love it. I purchased this for ARRL Field Day and quick set-up situations; also for at home since I have severe electrical interference and mag loops are generally less affected by electrostatic interference. I have gotten 5000 kilometer FT8 and 2000 km PSK31 with 40 watts from my bedroom barely above ground level using ten feet of refrigerator copper tubing formed into a loop for 20 meters. Tuning it is somewhat non-obvious but now that I know what I am doing I almost never need to use the radio's built-in tuner and I typically get a perfect 1:1 match. Tuning range is somewhat limited but you'll want a loop for each band anyway. BEWARES: Check the variable capacitor plates carefully also solder connections. Last night I adjusted the butterfly capacitor plates since the rotor wasn't centered with the stator leaving the plate spacing much closer than spec, which in turn allows for arcing at much lower power than the rated 150 watts (in my case, about 60 watts). There's also an issue with the wire and lug; the ziptie for the current sense toroid prevents the wire from being centered in the hole provided and consequently there's about one millimeter between the high voltage wire and the chassis. I fixed that, too.
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