The FLEMO - Made by Yagi
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not break when operated in<br />
a normal way. Evidently, it<br />
has been made of good quality<br />
materials.<br />
In our test location in<br />
Western Poland we receive<br />
relatively weak terrestrial<br />
TV signals. <strong>The</strong>refore, we<br />
weren’t surprised that the<br />
<strong>FLEMO</strong> was not able to pick<br />
up a useful signal indoors.<br />
We moved out to the balcony<br />
where our huge multi<br />
element wideband yagi is<br />
mounted. After installing<br />
<strong>FLEMO</strong> next to its big brother<br />
we could conduct a parallel<br />
test. We connected a signal<br />
analyzer to both antennas<br />
and checked signal quality.<br />
After checking different<br />
frequencies we found that at<br />
634 MHz the <strong>FLEMO</strong>’s output<br />
signal was about 8 decibels<br />
weaker than that of the big<br />
antenna (49.5 versus 57.3<br />
dBμV). Carrier to noise ratio<br />
was 36.8 dB compared to<br />
44.2 dB. Difference in MER<br />
readings was also ca. 8 dB<br />
(23.5 vs. 31.4). So, to our<br />
big surprise, the <strong>FLEMO</strong>’s<br />
antenna gain was just 8 dB<br />
below that of a multi element<br />
yagi 1 meter long and<br />
0.5 meter wide. A sign of the<br />
well thought of design of the<br />
<strong>FLEMO</strong>.<br />
We felt it was a bit unfair to<br />
use a fully grown up antenna<br />
to compare with the miniature<br />
<strong>FLEMO</strong> so to make the<br />
competition a bit more fair<br />
we took another set of measurements<br />
with a single element<br />
yagi-type antenna with<br />
a center frequency of 565<br />
MHz and about 1 meter wide.<br />
We wanted to check if such<br />
an antenna - 4 times bigger<br />
than the <strong>FLEMO</strong> - would produce<br />
comparable results.<br />
And this time the <strong>FLEMO</strong><br />
was an indisputable winner.<br />
<strong>The</strong> yagi-style single element<br />
antenna produced only<br />
37 dBμV of output signal<br />
while the <strong>FLEMO</strong> delivered<br />
a very similar results to the<br />
first test: a channel power<br />
of 50 dBμV, C/N 36.3 dB and<br />
■<br />
<strong>The</strong> <strong>FLEMO</strong> mounted on top<br />
of a full grown UHF antenna<br />
during our tests. Reception of<br />
the <strong>FLEMO</strong> is only 8 dB less<br />
compared to the big antenna.<br />
68 TELE-audiovision International — <strong>The</strong> World‘s Largest Digital TV Trade Magazine — 01-02/2014 — www.TELE-audiovision.com<br />
www.TELE-audiovision.com — 01-02/2014 — TELE-audiovision International — 全 球 发 行 量 最 大 的 数 字 电 视 杂 志 69
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