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Thursday, 16 March 2017

E51KTA antennas

Well the 30m GP (was 4sq) is working fine as WSPR beacon antenna (will try some SSTV/CW tomorrow.
Think the VSWR is OK
Whilst work on 40m stuff seems 30m GP works.

I love this one. The feed point is about 2.5m up.... as this was where the element got to when secured from the top of the pole. Helically wound again. The radials were all added to fit the freq, lowered from the 4sq versions which were 100kHz higher than the overall.

The 40m 2el is performing better than expected. It is a vertical and I am near the see and surrounded by water so it is great for LONG skip stuff, so the UK hits that spot on 40m just right.... Sadly issue with being QRO is as everyone hears me well I get all the stations calling so the noise levels rise.

I think the VSWR is OK. About 4th attempt. Elements were 42 and 48cm too long (front/back).
Design got tweaked a bit as wanted more front gain but didn't want elements as close as 1/8th wavelength apart. Not switching this is all or nothing in one direction. Andy E51AND made up the little box after a shopping trip and rummage for bits.
 Just laying it out. It is directed towards UK.
 M1KTA Office gets everywhere. Wearing socks with the sandles as there are these red ants in the grass, ouch when they bit.
 Measuring up... so hot sweat buckets so change of T shirt to Stewart Island one. Knew the tape measures would come in handy.
 One of the feed points. Belbin 9913 coax and those ARE M5 brass nuts, washers and wing nuts from 30m 4SQ. 10m travelling poles just bit too short so helically wound the element on it. Lots of ground based radials.
Sadly when it works it really works so this is RBN showing all the guff I have to get through to hear UK signals still about 10dB lower! RBN but call for G only and I hear ROW too :-)

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