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![]() "Jerry Martes" wrote in message news:m4qZi.419$763.177@trnddc07... I missed being able to be clear in my "other" post. If there is a Beacon signal available from a POE satellite at 2meters there is an Excellent 2Meter source of signal with which a person can use to Very Accurately record the radiation pattern from horizon to horizon at all azimuth angles. That radiation pattern will be the pattern of the Ground antenna, not the satellite antenna. We have to assume the satellite radiates equal in all directions. The strength of the received signal is recorded into some program like Excel as a function of time. The actual Az-El to the satellite is published, or can be computed. So, it becomes fairly easy to record the actual (ground based) antenna's radiation pattern which includes all the environmental effects like trees and neighbors's houses. Jerry KD6JDJ Jerry you were clear to me. There are several things wrong trying to use the sat to determine the patern of the antenna on the ground at other than the specific pass. Low orbiting sats will start at a great distance as they come over the horizon and get to with in a few hundred miles as they go over head. The squnit angle of the sat antenna will change so the sat antenna is not always pointing at the ground antenna. The apparent polarity will change and that can make a big differance. I have the KLM circular beam pair for 2 meters and 435 mhz on an az/el setup and computer control. Also can switch from left to right circular and have monitored the sats go over and sometimes have to switch left to right as they pass for the best signal. I have not tried it on a sat but for the Icoms ( it might work on others) there is a program that will record the s-meter and draw a plot on the screen . I have done it looking at repeaters and it does seem to work ok for drawing paterns. |
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