HAMRADIO_LY: 6 metru diapazono antenos

07:04:42, 28 Jun, 2009  Hamradio_LY

Sveiki,

Sesiu metru diapazonas atsigauna, jis ne viena is musu jau
nudziugino naujomis salimis, naujais idomiais rysiais.
Ir pats laikas pradeti galvoti apie geresne antena siam diapazonui.

Lionelis VE7BQH suskaiciavo ir pateike lentele su 6m firminiu
antenu tipu parametrais.
www.bigskyspaces.com/w7gj/6mTable.htm

Pridedu is e-mail gauta sarasa, jame tvarkingiau matosi firmu
pavadinimai.

LY2BAW sesiu metru diapazone naudoja M2 firmos pagaminta
antena 6M2.5WLC, jos parametrai matosi
www.qrz.lt/ href=’http://www.qrz.lt/ly2baw/’ title=’Tadas’> LY2BAW/vhf_antennas.html

Paspaudus sios ar kitu antenu pavadinima, pav. “6M2.5WLC”,
galima pamatyti ir antenos brezini su konkreciais elementu ilgiais.
Gal kam idomu…..

Zemiau idedu ir Lance W7GJ laisko fragmenta, manyciau,
jog jo tekstas bus idomus ir Jums.

Dar tiek daug retu saliu laukia musu “stebuklingame diapazone”
- neveltui ji vadina “Magic Band” .
www.lrmd.lt/utb/first50.htm

73 Tadas LY2BAW

……………………………………………………………………………….
“….
Over the last quarter century, antenna performance has improved
dramatically. Thanks
to the development of computer modeling software, antennas can now be
designed to
provide excellent results. Many older antennas are still in use around the
world
that were built using less sophisticated techniques. A number of 6m
operators have
wondered if it is time to upgrade their antenna systems.

There is no question that each operator has different interests and
constraints.
Some want to arrange various antennas to “fill in the nulls” in ground gain
patterns
so they can be assured of not missing signals coming in at certain angles.
Others
want to increase maximum signal strengths while still fitting the antenna in
their
garden. And still others are interested in assembling an antenna system
that will
have enough free space gain to enable them to complete EME contacts while
the antenna
is elevated (without any ground gain). With the differences in how antennas
are
marketed and what specifications are published, it is no wonder that many
hams have
expressed confusion when they try to compare antennas to determine what
would be the
best choice for their particular situations.

Lionel Edwards, VE7BQH, is well known for his pioneering work in EME and his
knowledge of antenna design. His comparison table of 2m antenna designs has
been a
valuable resource for weak signal enthusiasts on that band. Lionel now has
generously put together a table comparing a number of popular 6m antennas to
help
guide Magic Band operators on antenna decisions. This table was
painstakingly
prepared to include the free space gain of each yagi with respect to a
dipole, the
optimum and 75% of optimum stacking distances for both two and four yagis
and
resulting gain figures, and the SWR of a single antenna 150 kHz from the
design
frequency. The SWR value provides an indicator of the “Q” of the antenna,
and how
likely it is to be affected by rain, ice and snow; the narrower the
bandwidth of the
antenna, the more susceptible it is to such detuning by the weather.

www.bigskyspaces.com/w7gj/6mAntennaComparisonTable……

Please join with me in thanking Lionel for graciously agreeing to undertake
the very
laborious challenge of preparing such a table. I will also post a link on
my website
to the table for convenient future reference, along with links to more
information on
many of the antennas listed in the table.

GL and DX! VY 73, Lance W7GJ….”
…………………………………………………………………………………
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