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S.M2

Two element stacked dipole array

  • The S.M2 are an array of two centre fed folded dipoles mounted on an aluminium mast.
  • Each folded dipole balun assembly and associated harness junction is completely encapsulated in epoxy resin, totally preventing moisture ingress.
  • The balun assembly has been tested to BS5490:IP67.

Description

  • The parallel feed enables beam tilt to be easily achieved, and the dipoles can be reorientated to shape the beam pattern.
  • At VHF the antenna disassembles and flat packs for ease of shipping.

ORDERING DESIGNATIONS

TYPEFREQUENCYPRODUCT NO.
S.M2-127117 - 137 MHz123003110
S.M2-165155 - 175 MHz123003111
S.M2-184176 - 192 MHz123003112
S.M2-200192 - 208 MHz123003113
S.M2-405380 - 430 MHz123003114
S.M2-445420 - 470 MHz123003115

SPECIFICATIONS

TYPEPRODUCT NO.
UA66-22123001005
2140.01.00.00123001012
2141.01.00.00123001013
ELECTRIAL 
FREQUENCY RANGE117 - 470 MHz
INPUT IMPEDANCE50Ω
BANDWIDTH± 4% of centre frequency
SWR<1.5:1
FRONT TO BACK RATIO5.5 dB
MAXIMUM INPUT POWER250 W
POLARISATIONVertical
FORWARD GAIN5 dBd
3 dB BEAMWIDTHE Plane 36º
H Plane 180º
MECHANICAL 
STANDARD CONNECTION3 m (118.11 in.) Length of RG 213
c/w \'N\' type socket
ELEMENTS12.7 mm dia. x 1.6 mm wall
aluminium alloy grade 6063T6
SUPPORT BOOM UHFUHF 38.1 mm dia. x 3.2 mm wall
aluminium alloy grade 6082T6
SUPPORT BOOM VHFVHF 63.5 mm dia. x 6.3 mm wall
aluminium alloy grade 6082T6
FASTENERSStainless steel grade A2-70
DIPOLE CLAMPSCast aluminium alloy
DIPOLE ADJUSTMENTM8 stainless steel screws
SADDLE CLAMPSDiecast zinc alloy
INSULATOREpoxy resin encapsulant
LIGHTNING PROTECTIONDirect grounded VHF lightning finial
MOUNTING BRACKETS UHFUHF fit inside scaffold pole
MOUNTING BRACKETS VHFVHF to suit structure
TYPICAL WEIGHT (UHF)UHF 4 kg / 8.82 lb.
TYPICAL WEIGHT (VHF)VHF 9 kg / 19.84 lb.
TYPICAL LENGTH (UHF)UHF 1.25 m / 49.21 in.
TYPICAL LENGTH (VHF)VHF 4 m / 157.48 in.
TYPICAL WIND LOADING
@ 162 km/h (UHF)
UHF 85N
TYPICAL WIND LOADING
@ 162 km/h (VHF)
VHF 292N
SURVIVAL WIND SPEED350 km/h (97 m/s)

MOUNTING ACCESSORIES

Mounting accessories to be ordered separately.

 

UA66-22

Very strong square cast alloy clamp, fits up to 50 mm diameter tubes as either a cross-over or parallel clamp. Supplied with two stainless steel ‘U’ bolts.

2140.01.00.00

Parallel clamps, in galvanised steel with stainless steel fixings, fits from 25-60 mm diameter tubes.

2141.01.00.00

Parallel clamps, in galvanised steel with stainless steel fixings, fits from 38-120 mm diameter tubes.

 

TYPICAL RADIATION PATTERN (E-PLANE)

TYPICAL RADIATION PATTERN (H-PLANE)

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