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

[Welcker]

You might want to think through #3 "the UHF Beams".  With this 
configuration you will encounter severe desence to the non transmitting 
radios plus IM products
if two radios are transmitting simultaneously.  UNLESS you provide a 
minimum of 60db of quality bandpass filter per radio (very expensive).  
The alternative is to
stagger the beams up and down the tower depending on the path loss 
caluclations with a minimum separation of thirty feet..  We (the Palm 
Beach Packet Group) have aready corrected two sites (Lake Placid & Vero) 
in the past six months that had their UHF beams collocated.

Doug (WB4KGY)

Evans Mitchell kd4efm / afa2th fl wrote:

>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. 
>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. 
>(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 
>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 
>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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