Ok Viesturs! As a former RF-engineer and a radioamateur hunting RF signals in the woods I believe your first job still is to find a better antenna-position. This is after you have made sure the cabling is in order so that is not the real cause of your problems. It's not certain you need a 30 meter mast, you just have to check up that your antenna points in the right direction who should almost always should be in the direction of the transmitter. Next is to select an antenna with the right antenna gain, that´s how focused your antenna is, higher gain makes it more important to put it in the right direction. Om the other hand, if yo have forest beteween your site and the transmitter you will probably have a scattered signal with the incoming wavefront components coming from different directions. That makes a high RF gain antenna useless. Anyway, the antenna gain is defined in dB, higher dB makes it more important to adjust your antenna to the source, your RF signal strengh reading should vary depending on your alignment. A realtime RF signal meter function is most often integrated in modern receivers.
This leaves you with some options: 1) Raise the antenna level as high as possible/needed. 2) If you have a mountain/ high forest wall behind you, it might be possible to direct your antenna at the reflected signal, but that is an unusual situation. 3) Trying to insert an amplifier in the downlink is most often useless unless you have a very long RF transmission cable to the receiver because then it will compensate for transmission line losses in the cable. Some RF amplifiers also have filtering included which helps if you have an interfering unwanted signal in the vicinity. Local resellers might know about such sources. / Roger ---------- - abCNC ----------- Roger Holmquist Bockarp villa Tallebo 59592 Mjölby +46-706-250123 +46-768-788477 +46-142-20542 ro...@abcnc.se http://abcnc.se ------------------------------------------------------------------------------ This SF email is sponsosred by: Try Windows Azure free for 90 days Click Here http://p.sf.net/sfu/sfd2d-msazure _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
