Sunday, August 06, 2006

Checking your antenna

MFG 269

To check out your antenna without transmitting
using your rig, yu can use this Antenna analyser.

It covers the frequency bands of 1.8 to 170 MHz
and 415 to 470 MHz, It uses an easy-to-read two
in line LCD display and side-by-side
meters which clearly display your information.
It also has a signal source for testing/alignment.
Built-in CoaxCalculator -- calculates coax line length in feet
given coax length in electrical degrees and vice versa
for any frequency and any velocity factor (great for
building matching sections and phasing lines).
New 12-bit A/D converter gives much better accuracy
and resolution than common 8-bit A/D converters.
Just set the bandswitch and tune the dial -- just like
your transceiver.
1.8 to 170MHz range feature MFJ-269 gives you a
complete picture of you antenna. Read antenna SWR
and Complex Impedanc. Built in frequency counter.
Read Complex Impedance as series equivalent
resistance and reactance (Rs+jXs) or as magnitude
(Z) and phase (degrees). Also read parallel equivalent
resistance and reactance (Rp+jXp). You can determine
velocity factor, coax loss in dB, length of coax and distance
to short or open in feet. You can read SWR, return loss
and reflection coefficient at at any frequency simultaneously
at a single glance. Also read matching efficiency.
Read inductance in UH and capacitance in pF at RF frequencies.
You can measure SWR and loss of coax with any characteristic
impedance from 10 to over 600 Ohms, including
50, 51, 52, 53, 73, 75, 93, 95, 300, 450 Ohms.
Just plug in your UHF antenna coax, set the frequency
and read SWR, return loss and reflection coefficient simultaneously.
You can read coax cable loss in dB and match efficiency.
You can test and tune stubs and coax lines.
You can manually determine velocity factor and
impedances of transmission lines. You can adjust and
test RF matching networks and RF amplifiers
without applying power. Has easy-to-read LCD logarithmic
SWR bargraph and SWR meter for quick tuning.


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