RADIO ARCALA MAMMOTH 160/80M BEAM IN A NUTSHELL

If you want to build an Arcala Extremes (OH8X) style beam, you should start with measuring your property lines. Each of the four guy wires extends 120 meters or 400 ft from the tower – representing an area of 170´170 meters (550´550 ft) for a needed total space of almost three hectares. And then be ready to order needed 450 meters (1500 ft) of heavy duty tower sections. And finally make it look nice with 600 litres (120 gallons) of paint! Ready for the latest story from frozen Arcala deep North?

 

oh8x

 

Height and weight of the system     

Tower height: 100 m (330 ft)
80m beam: 90 m (300 ft)
160m beam: 80 m (270 ft)
Total weight: 39.600 kg (80 000 lbs)

 

Elements, gain and take off angles   160m: 3 elements, 12.9dBi, 26°
80m: 5 elements, 15.7dBi, 12°
     
Front to Back ratio   160m: 20-30 dB
80m: 20 dB
     
Operating frequencies   1810-1845, 1845-1880 kHz (SWR < 1.6)
3500-3560 kHz (Lmatch)
3700-3800 kHz (50 ohm / current balun)
     
160 m elements   Weight 1600 kg, (3800 lbs), each
Length 59 m (190 ft), all elements 12m (36ft) capacitive hats
Each use 700 m (2100 ft) of tubing
Tuned with 06 μH coils at the center
Relay switches for turning the ant 180°
     
80 m elements   Length 46 m (140 ft), longest
10 m from the 160 m antenna
max. windload, 70 m/s
     
Boom dimensions   160m length 71 m (215 ft)
80m length 60 m (200 ft)
The triangular 160m boom (2.2 m, 7.3 ft) comes with a rail for walking inside it
     
Mammoth’s vertical behaviour on 160 meters    
     
Turning gear   Weight 2000 kg (6000 lbs)
11 kW motor
Inverter driven softstart/stop
     
Largest guy ring bearing   Weigth 3300 kg
50 mm (2”) diameter balls in the bearing arrangement
Ring diameter 3,8m (13 ft)
     
Guy wires   Total length 2300 m (6900 ft)
Phillystran/element guys 1150 m (3450 ft)
     
Final touch   600 litres (120 gallons) of paint
     
Mechanical design and project Management   Tuomo Halminen, HALTA OY
     
Antenna design   Pekka, OH1TV, 160 m
Olavi, OH5BR, 80 m
Lauri, OH8LK, switching systems
     
Arcala team members busy at the project   Juha, OH8NC
Veijo, OH6KN
Martti, OH2BH
Toni, OH2UA
     
Group working on the project of their lifetime   Toke, OH6RM
Pekka, OH7RM
Markku, OH8SR

 

The construction is capable of handling ICE and SNOW for its own weight. In an ice storm? God Bless Radio Arcala!

 

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© DL7AWO

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