10 GHz Setup at DF2CK

Currently (August 2003) I use 10 Watt and a 120 cm offset dish (abt 40 dBi gain) on 10 GHz. The calculated EIRP is 100 kW. The transverter is the DB6NT MK2 version. Measured noise figure is 1 dB. The IF-radio is either a IC706MK2 or a TS850SAT with LT2S. A picture of the 10 GHz corner of the shack is shown below.



from left to right: PC with beacon database, AF waterfall spectrum display and dish-cam monitor. On top of the monitor is the ATV receiver. Laptop with wireless LAN card for internet access (mainly used to get radar pictures), packet radio. TS850 with LT2S, AGC can be switched of for sun noise measurements. On top of the LT2S is a FT100, the IF radio for 24 GHz. IC706 on top of its powersupply. 10 GHz control and interlock box, output power, amplifier current, mast mounted transverter box temperature and the presence of all vital voltages are monitored here. It also houses a cw-keyer / CQ-mashine combo and dish elevation control. On top of the control box is the transverter and amplifier powersupply and a multimeter for overall current monitoring. Above that is a patch field for various coax and control cables. The azimuth rotor control box is to the right, its a standard HAM4 rotor box with built in digital degree reading. Overall accuracy over full 360 degree is about 3 degree, one thing to be improved. In the upper right corner is an IC-245E with 80 W amplifier used for talkback with the local 3 cm DX-er community (DM2AFN, DL1DVE, DL1VDL, DL4DTU, DL4WO). Note the copper pipe in the background, its the global earth terminal of the shack, every radio, PC, monitor, powersupply housing is connected to it. In front is the old fashion way of logging.





The antenna is a 120 cm offset dish, its 20 m above ground, almost on top of the V/U/S/EHF mast. The elevator is a normal satellite dish actuator. Elevation is monitored by an accelerometer which is mounted in box marked "Camel" (Camera + Elevation) together with two CCD-cameras. Elevation can be altered from -15 to +30 degree from horizon which makes ground- and sun-noise measurements possible. Positive elevation is also often used for rainscatter when scatterpoints are close. Note the two steel ropes (looks just like one due to perspective) that support the feed arm. Without them, the feed arm may be bent during stormy weather as the transverter box with the amplifier heat sink is pretty heavy (abt. 5 kg).




Inside view of the Camel box. "Acc" markes the accelerometer used for elevation sensing. "HS" is a bag of hygroscopic stuff that sucks up moisture that may get in the hermetically sealed box. "Cams" is the two CCD cameras, described later. "SUB-D" is the connector, the cable that carries the video and accelerometer singnals and the supply voltage is 25 meter standard CAT-5 cable, normally used for computer networks. Its impedance (100 Ohm) is not quite matched to the 75 Ohm video signals but it works fine.


 

Another view, Cam1 is a CCD-camera with 200.000 pixel resolution, actually more then enough to see and track the sun during sun noise measurements. It is protected be three layers of welding glasses glas, broken into pieces and glued to a three layer stack (see right picture). The glas pack is protected from moisture with silicon paste. Cam2 is a 250.000 pixel CCD-cam used to look where the dish is pointed to, not a really vital part, but helpful for ground noise measurements (horizon scan) and the kids love to play with it :)




Image of Cam2, taken about 45 min after sunset. The CCD-chip is pretty sensitive, 0.2 lux according to the datasheet. View to south, sunset was in north-west. The pixel-grain is due to grabbing, live video has more contrast.