MFJ-936C Deluxe High-Efficiency Magnetic Loop Tuner Instruction & Technical Manual
Table 3: Efficient Loop Length Estimates
(a) Single Band
Band (m) Length (ft)
80 63.0
40 28.0
30 20.0
20 13.0
17 9.0
15 7.0
12 5.5
10 4.0
(b) Multi Band
Bands (m) Length (ft)
40 – 30 20.0
30 – 20 13.0
30 – 17 9.0
20 – 15 7.0
17 – 10 4.0
on-air experimentation. Designing an outdoor loop for a band such as 7 MHz could be a challenge
yet result in a very good radiator and especially good receiving antenna for DX-ing and
rag-chewing. We at MFJ think the experimental aspects of the MFJ-936C are exciting, and can
provide hours of quality operating, even at QRP levels.
4.2 CONFIGURATION
Setting up the MFJ-936C Deluxe High-Efficiency Magnetic Loop Tuner™ (Figure 6) is simple and
consists of the following components:
• RF Source (Transmitter/Transceiver)
• SWR/Wattmeter
• MFJ-936C Deluxe High-Efficiency Magnetic Loop Tuner™
• Coaxial cable(s)
• #10 gauge (or larger) stranded wire cut to approximately 20% of the full wavelength at the
chosen frequency
Figure 6: Typical MFJ-936C Configuration
5 SYSTEM OPERATION
The most important aspect of using the MFJ-936C Deluxe High-Efficiency Magnetic Loop
Tuner™ is that it creates opportunities for amateur operators to once again experiment while
enjoying operating at the same time. Imagine how exciting it can be to establish contact with a
distant station using an antenna that you designed for the first time! Even more so, what if you
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