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Coverage Desired (< 30km,30-300 km, long-haul)
Selected Mode of Propagation
Directional orOmnidirectional
Polarization
Availability of good grounds
Ease of camouflage
Space availability (clear ofobstructions?)
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Ideal solution depends onwhether antenna is balancedor unbalanced in design
Use coax for unbalanced
designs (one side grounded)Use open-wire line forbalanced antennas (ideal) ORcoaxial cable with a balun(balanced-unbalancedtransformer) (best) or by
winding a coaxial choke toprevent ground currents
Use an appropriate cable forthe power level and loss(length)
7-8 turns, approx 10 ft of cable
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Feedline Loss (Matched)
0
0.5
1
1.5
2
2.5
0 10 20 30 40
Frequency, MHz
Loss,
dB/100ft.
Belden 9913
RG-8
RG-58
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Ratio of the voltage of the reflected wave at any onepoint on the feedline to the voltage of the forwardwave at that same point.
Ideal SWR (Matched line) is 1:1
The higher the SWR, the more power is lost in thefeedline and more power reflected back intotransmitter finals
Many radios reduce power automatically at 2:1 or 3:1SWR to save final transistors from overheating(automatic fold-back)
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20516900.7 dB10.1 dB65:128.4
15636300.4 dB5.2 dB18:124.9
23067570.8 dB9.8 dB73:121.1
20737800.6 dB9.0 dB65:118.1
18635300.5 dB1.9 dB6:114.1
28699670.9 dB10.4 dB134:110.1
19649810.3 dB5.8 dB49:17.1
318811810.9 dB5.7 dB63:13.8
7640164012.1 dB25.9 dB1818:11.8
MaxVoltage450
MaxVoltageRG-8A
Loss, 100ft450 Line
Loss 100 ftRG-8A
SWRRG-8A Coax
MHz
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Frequency range: 2 to 30 MHz
Polarization: Horizontal andvertical simultaneously
Power capability: 1,000 watts(CHECK MOUNTING PLATE
some are limited to 50 wattsby the baluns!)
Radiation pattern - NVIS
Azimuthal (bearing):Omnidirectional
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Ubiquitous in the mobileenvironment
Majority of energy is radiatedabout 45 degrees to the
horizonPattern strongly affected byvehicle body
Good grounding is critical
OK for ground wave comms
over short distances (< 30km)16/32 ft transportable unitswith ground radials (AT-1011/U)
Requires tuner
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Figure A-15. Radiation pattern of a whip antenna.
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Less gain than a dipole, butonly requires one support
Combination of vertical andhorizontal radiation
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At least 1/2 in length,preferably 2 or more
Longer wire, lower takeoffangle, more gain
To make it directional, add a600 resistor (rated at halfthe xmit power)
Works best with a 12:1 balunif using coaxial cable feedline
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Ground wave and short-rangeskywave
Omnidirectional
Quite adaptable with existingtuners and 35-40 ft verticalheight
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Medium- to long-rangeskywave propagation
Antenna should be at least 1in length, 2 or more better
To make directional, add 600resistors on each leg.
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45 to 500-foot wire (longer isbetter)
Poor performer at shortlengths
Can be terminated withresistor for improved tuningand directivity
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Medium- to long-rangeskywave
500 to 1000 ft lengths of greatvalue
Can be terminated fordirectivity
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Feedline3 x 100 ft. RG-8X coaxial cable w/N-M connectors
2 F-F N adapters
Adapters 2 ea. Of N-N Female, N-Female to UHF Male, BNC-Male toN Female
Lightning/NEMP Protector w/N Female connectors (Polyphaser orHber-Suhner)
Grounding
1 inch copper braid strap, 10 ft w/lugs (PRC-150 ground)1 inch copper braid strap, 6 ft w/lugs (amplifier ground)
Ground rod kit
MK-2551 Surface Wire Grounding Kit
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