# Tower 1 (M1)

Tower 1 (M1) is 105 meters high (344ft) rotatable tower. It holds 20M and 80M yagis.

On 20M antennas are 4 stacked 6 elemement yagis. Each 20M yagi has boom lenght of 18 meters (59ft) and stacking distance is 24 meters (80ft).

On 80M antenna is 2 stacked 2 element yagis. 80M yagis have also boom lenght of 18 meters (59ft) and stacking distance on 80M is 43 meters (141ft).

# Tower 2 (M2)

Tower 2 (M2) is 60 meters (200ft) high rotatable tower carrying antennas for 40M – 10M.

On 40M there’s two stacked 2 element yagis and for 20/15/10M there’s six stacked 10 element tribanders.

# Tower 3 (M3)

M3: 60m

3*10/6

12/6

# Tower 4 (M4)

M4: 60m

3*40/2

3*15/6

17/6

30/3

# Tower 5 (M5)

M5: 42m

DP 160/80

40/2

20/5

15/5

10/5

# Tower 6 (M6)

M6: 32m

DP 160/80

40/2

3*tribander

# Tower 7 (M7)

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?

**Height and weight of the system**

Tower height 100 m (330 ft)

80 m beam 90 m (300 ft)

160 m beam 80 m (270 ft)

Total weight 39 600 kg (80 000 lbs)

** Elements, gain and take off angles**

160 m 3 elements, 12.9dBi, 26°

80 m 5 elements, 15.7dBi, 12°

**FronttoBack ratio**

160 m 20-30 dB

80 m 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 centre

Relayswitches 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**

160 m length 71 m (215 ft)

80 m length 60 m (200 ft)

The triangular 160m boom (2.2 m, 7.3 ft) comes with a rail for walking inside it.

** 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!

Hats off to Markku, OH8SR (left), Toke, OH6RM and Pekka, OH7RM.

Truly, these are men of iron!

## M7 tower rotated