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Dutch Amateur Radio Station |
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Remote QTH in Meijel, JO21WA
Nowadays, working EME can be fustrating due to the raising noiselevel in urban surroundings. Therefore more and more stations are setting up a remote location. As my EME-neighbour Lins, PA3CMC, was suffering the same problem, we decided to build a remote station together. It will be located in Meijel, near the QTH of PA3CMC but outside the village. We call it EME-project 2009. When finished the station will consist of 8 x 32 element XPOL Yagis. All hardware is already collected...just the needed time to build it up is a problem as both Lins and I are working on new carreers and new companies. This is taking a lot of time and efforts for both of us. Lins has build up a temporary antenna of 4 x 19 elements LLY Yagis and is enjoing the very low noiselevel at the remote site. |
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Scroll down to see more pictures from the EME-project 2009 |
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General overview of the remote site. It is used as a storage for soil, grit and some containers for the company of PA3CMC (Martens Milieu). |
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An old shed is available but in bad condition. However it keeps us out of the rain as long as the mobile shack is not in place yet. |
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A group of 4x12 elements M2 was used to see if the remote site was free of noise. A test proved that the site has a low noise level and the 144 MHz band is free of birdies. |
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For an eight Yagi group a decent rotor is necessary. From ON4AOI a Rhode & Schwarz rotator was purchased. Most hardware in good shape but the motor needs work. |
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It is real heavy duty and has been used for rotating a big commercial logperiodic anten-na. |
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Job done...after a 1.5 hours drive safely stored in the workshop. The size can derived from the size of the Europallet (80x120 cm). |
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To control the antenna an OE5JFL antenna-controller was build. This controller tracks the moon independent from a computer. |
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Inside view of the controller. The hart is formed by a PLCC44 microprocessor from Atmel. It can be accessed through the internet. |
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A relayboard was designed too to be able to switch the azimuth and elevation motors. Readout is done by absolute encoders at 0.2 degrees accuracy. |
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The absolute encoders MAB25 and the well writen building manual from Alex, HB9DRI. The design is from Johannes, OE5JFL. |
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Lins, PA3CMC, brought in his 4x32 XPOL from IoJXX. I did the same so now we have 8 x32 XPOL. Lins decided to build a 4x19 LLY for the timebeing. |
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The mobile shack. Maybe you like the graffity...we do not so we need to do some paintwork on the outside. |
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For controlling the station a 4-stage sequencer was build. Indeed...it can be smaller but this will allow easy repairment when needed. |
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This heavy 4200 Volts, 2 amperes, high voltage powersupply will be taken out of service. It will be for sale very soon. |
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The GS35b cavity had found a place in the mobile shack. However rugged SSPA have found the way to hamradio. This modified TV amplifier will do vy fine on 144 MHz. |
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To control the GS35b a triode controller was build as a GM3SEK triodeboard cloon. As the GS35b will not used anymore, this will be for sale soon as well. |
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The GM3SEK schematic was used to design an own PCB that was manufactured at home. When hooked up the first time it smoked as the K+F and K were switched somewhere during the build (cavity was at remote site). |
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Picture of the temprary setup of 4x19 ele-ments LLY Yagi (I3DLI design) from Lins, PA3CMC. With no vertical polarisation it sometimes takes more time but still doing very fine. |
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GS35b cavity. The design looks like UV1US/RX1AS or PA3CSG but the tube has a larger diameter like F1CXX. |
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Detailed picture of the loadcapacitor of the ampifier. A mica sheet is mounted between the plates to prevent a flash over. |
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Detailed picture of the tuning capacitor. A mica sheet is mounted between the plates to prevent a flash over. A 50 Ohm line has been made from two copper tubes with the right dimensions. Output connector is 7/16. For testing a N to 7/16 was used as can be seen on the picture. Output is more than 63 dBm. |
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OZ1PIF has nice PCB for ATF-54143 preamplifiers that are based on the PA3BIY design. NF should be below 0.25 dB |
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