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I got my license 1993 during the military service. But alot of other things was more important at that time of my life and I wasn't very active on the band, at this time i was also living in the central part of the town and that resulted in limited possibilities to put up antennas and also alot of noise on the bands.

2008 i bought a house 15km outside of the town, here is much less interference and better possibilities to put up antennas and towers. So 2010 i bought a new radio and put up the first antenna, a wire-antenna, this was at christmas time. During the spring at same year i put up my first tower 18m Vargarda with a 6m/60mm pipe at the top.

Put up couple of antennas to the pipe ,3 optibeam antennas. 1 OB16-3 (20,15,10) and 1 OB WARC7-2 (12,17) and OB5-6 (6m) at the top and a Force12 Delta 240 (40m). This made a BIG difference from the wire antenna. so the hunt for DXCC started.

Thoughts of a second tower was also on my mind. Started to look for something suitable, i also had plans for making it rotatable, in that way it's easier to put up a bigger antenna without risking the ham rotor to brake. It's also much more stable than a 60m pipe. Looked around for some time but couldn't find anything so I decided to build it my self, OK alot of work but much cheaper.

So in june 2013 i ordered the steel and some laser cut plates. Started to weld together a fixture to make all sections equal and to make it easier to assemble. 1 week later all section was finished 7 pcs 6m and 1 pcs 3m total length of 45m, all sections was sent to a company for galvanization. This gives the tower a nice look and good protection against the weather for at least 40 years.

During july and august 2013 I put the tower together (a lot of nuts and bolts) and all the new antennas (even more screws).
In the end of august i booked a big crane, and some hams from the local radio club SK2AT came to help with the big lift up. 4 Hours later everything where in the air.

For controling of the antenna switches and tower rotation I have developed some electronics 2 different types of IO boards 1 board has 8 inputs and 8 ouputs.. using it to control the frequency converter for the rotation motor. The other one has 16 outputs and is used for control of the stack boxes and the antenna switches. last bord is an absolute encoder interface. Tower position is monitored by an absolute encoder, in that way a will always now the position even if it's turned when the power is turned of. All boards communicate with the main controler over CANbus. So boards are put close to switches etc and therefore i don't have to use so much cables 12 VDC and 2 wires for the bus.

Main interests is chasing new DX, rag-chew and constesting. both on CW and SSB.

Station info

Rigs:

Yaesu FT897

Yaesu FT857

Yaesu FTDX5000D

Yaesu VX8D

Kenwood TH-G71

ICOM IC-2820

QROlle classic ( KIT)

QROlle II (KIT ) http://qrolle.thulesius.se/

Linear:

SPE Expert 2K-FA

Antennas:

All antennas are optibeam

1 OB804020 (2el80, 3el40, 5el20)

1 OB4020 (3el40, 5el20)

2 OB1510 (5el15, 5el10)

1 OB5-12 (5el12)

1 OB5-17 (5el17)

1 OB2-30 (2el30)

1 OB5-6 (5el6)

Following setup:

80m 2el @ 46.5m

40m 3/3 @ 46.6m and 26.6m

30m 2el @ 37m

20m 5/5 @ 46.6m and 26.6m

17m 5el @ 20m

15m 5/5 @ 32m and 19m

12m 5el @ 23m

10m 5/5 @ 32m and 19m

6m 5el @ 25m

46.5m Rotating Tower put up 2013

Antennas from the top: OB804020, OB2-30, OB1510, OB4020, OB5-12, OB1510

View of the first tower 25m at the top. At the bottom an optibeam OB5-17 (5el17m) and an old 15el2m QUEDEE and at the top OB5-6 (5el6m)

 

 

Pictures from the project

Welding of tower sections

Some welded section .. wating for the flanges at the pipe ends

Flanges welded.. for connection of two sections

Part for mounting of the bearings for the guying ring

Picture showing the guying ring. There are two of these. One at 17.5m and one at 44.5m

Tower base.. big bearing and flanges to bolt the tower to the base, This part has an 3 phase induction motor for rotation

Second part of the tower .. wating for lift up in the backgrund 2 pcs OB1510 and the tower base

IO board for control of the frequency converter 8 inputs and 8 outputs

Absolute encoder board. Read postion data from the encoder over the SSI bus.. convert it to degrees and send out on the CANbus. it also contain some buttons to make it possible to rotate the tower from the base sectionwithout actualy turning the motor by hand

Boards during test run before final installation.

Main control. Control the rotation, manual control with buttons or run to a selected preset position. Feedback of actual position is shown in degrees and graphically as a meter like instrument. It slso controls bandswitching / antenna switching. Unit is connected to the transceiver so band data is read out and antennas are swithed in automatically when band is changed. It's also possible to select if antennas are used in a stacked pair or as singel antenna

 

 

 

202287 Last modified: 2014-01-02 11:14:29, 6999 bytes

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