MFJ MFJ-9219, Instruction Manual

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MFJ-9219 QRP Tuner, Wattmeter, & Dummy Load Instruction & Technical Manual
wave transmitted by a 2-meter VHF station has a frequency of about 145 MHz. Dividing the speed
of light (
∼ 3 × 10
8
m/s) by the frequency in Hz, we find that the wavelength in atmosphere of the
signal from our station is 2.06 m. Since wavelength and frequency are reciprocal, an increase in
wavelength corresponds to a decrease in frequency, hence, the 160 m band has a rather low
frequency of 1.8 MHz.
The electromagnetic spectrum (Figure 2) includes all of the various energies of electromagnetic
radiation ranging from extremely low frequency (ELF) ranges (with very long wavelengths) to all
the way up to x rays and
γ rays, which have very high frequencies and correspondingly short
wavelengths. In between these extremes lie radio waves, microwaves, infrared radiation, visible
light, ultraviolet radiation, and the entirety of the FCC spectrum allocation chart. The RF part of
the electromagnetic spectrum is generally defined as that part of the spectrum from about 3 kHz
to 300 GHz.
Figure 2: The Electromagnetic Spectrum
2 THE MFJ-9219
2.1 INTRODUCTION
The MFJ-9219 QRP Tuner, Wattmeter, and Dummy Load
™
(Figure 3), is the logical continuation
of MFJ’s legendary lineup of QRP products. Combining the features of the MFJ-9201 QRP
Antenna Tuner
™
and the MFJ-9218 QRP Pocket SWR/Wattmeter
™
into a single, conveniently-
sized package provides both the novice and experience QRP operator with a robust addition to
their station. Weighing in at only 51 oz and measuring only 5
× 4
1
/
4
× 2
1
/
2
inches, the MFJ-9219
can slip into almost any pack and won’t be a burden down the trail. The MFJ-9219 will work
out-of-the-box with the MFJ-9400 series of sideband transceivers, the VEC-1300 series, and for
those desiring a true QRP challenge, MFJ’s line of Cub transceivers. Which will you choose?
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