[FADCA] Antenna recommendations for the SNCP, BARTOW, 200 foot tower

Tue, 9 Mar 2004 21:59:29 -0500

From: Evans F. Mitchell, ARES EC, Polk County
To: Ben Holycross, Director of Communications, Polk County Emergency =
Management
CC: Polk County Communicators Program Volunteers; Lakeland ARC, Polk =
ARES Group
REF: Antenna recommendations for the SNCP, BARTOW, 200 foot tower.

Dear Mr. Holycross,
    I would like to share with you some of the site recommendations I =
have received and
some that I, Evans,  have included for the 200 foot tower at the SNCP / =
HAM EOC site.=20
These are the considerations, and only that, till you finalize and =
approve the recommendations.

1) Your recommendation for the top is One Each; 800 MHz, UHF, EMWIN, and =
a VHF (EMWIN left at current location)
    The 800, UHF and VHF would be mounted on 4 to 6 foot stand off's. =
ARES agrees.

2)    At the 175 foot level, two side arms with one VHF and one 220 MHz =
antenna on each, the vhf one would serve the IRLP
node, the 220 would serve as a communications antenna for a 220 rig at =
one of the control stations.=20
(Evans added the antenna idea the IRLP node, ARES added line item 2B)

2B)    One note, a multi-banded antenna at the second stand has been =
suggested that would cover VHF LOW (6 meter), 2=20
meter VHF HIGH, and 220 MHz. OR and antenna that would cover all bands, =
6 m 2m 23cm 70 cm and 1.2 GHz.
Research will be done to locate such an antenna for this option.

3)    At the 150 foot spot, One VHF antenna for the Polk County area =
wide packet station on a frequency of 145.570
    At the level of 136 to 140 foot (10 to 15 foot below the packet =
antenna) 3 UHF beams staggered, one points to
Clermont, (140') One to Tampa (138') and one to the south towards =
Arcadia at the 136' spot. (4 to 10 element beam antennas)
recommended by members of the FADCA organization to provide seamless =
coverage between EOC's, email can be forwarded
at your request.

4)    At the 125 foot mark, a WIDE BANDED HF ANTENNA, inverted "V",  =
recommendation, YES, should be able to use it
       for 160 meters (1,800 kHz to 2,000 kHz) Ideally being able to =
operate from 1.8 MHz to 30 MHz General Coverage Tx / Rx.

5)    At the 100 foot mark, two pulleys with lines, recommended. =
Additions: a second HF antenna called a SLOPPER
be added, the Shield (ground of the antenna) should be connected to the =
tower at this spot also. The center conductor should
extend to the east towards the wooded area and secured from there.

These are the notes I have collected for your review and tower loading =
studies as needed. Please advise should the loading
be too extreme for the tower, and need to be revised. It is also =
suggested to have the stand offs not under each other, but offset
under each other.

Item number 3 is to support intra-state communications on a digital =
network using
high speed back bone data links, UHF, and a 1200 baud LAN (the single =
VHF antenna at 150") This system will
support NTS and EMCOMM traffic for the center of the state and will also =
help support the SEDAN network during
an actual emergency. To find out more on the packet system the site may =
be found at www.fadca.org as well as a map
showing Polk County as lacking digital communications between the East =
coast and the West coast, and serving as a
Central packet zone for the packet system would be crucial to all hams. =
I can provide you with more information if=20
needed at your request.

73 From,
KD4EFM / AFA2TH USAF MARS
Evans F. Mitchell
Polk County ARES Member / SkyWarn #POL-017
Polk County EC
Polk County Communications Program Volunteer

<http://www.kd4efm.org>
kd4efm at arrl dot net
kd4efm at hotmail.com
kd4efm at kd4efm dot org

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