VK2XV
03-01-2018, 08:34 AM
Hi All,
Does anyone have any information about rain effects on Yagi arrays when used for E.M.E. on receive ?
During my 436 MHz observations of the Vela pulsar I notice when the antenna is wet there is a significant drop in received signal strength (during light rain the signal virtually disappears). The antenna is a long Yagi (5.7 m). I had thought that, while return loss is affected significantly, gain is less affected by water on the elements. I have done some preliminary tests by keeping the driven elements dry, but the effect still seems to be there. I ask for E.M.E. observations on this point as the loss of a few dB in sensitivity would be noticeable - just like my Vela pulsar observations.
Steve
Vela Pulsar observations...
Does anyone have any information about rain effects on Yagi arrays when used for E.M.E. on receive ?
During my 436 MHz observations of the Vela pulsar I notice when the antenna is wet there is a significant drop in received signal strength (during light rain the signal virtually disappears). The antenna is a long Yagi (5.7 m). I had thought that, while return loss is affected significantly, gain is less affected by water on the elements. I have done some preliminary tests by keeping the driven elements dry, but the effect still seems to be there. I ask for E.M.E. observations on this point as the loss of a few dB in sensitivity would be noticeable - just like my Vela pulsar observations.
Steve
Vela Pulsar observations...