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@Analoguesat @Terryl do these figures look right for 137.500
![CB012FC9-2B26-42AE-A453-7D7174DF4E1E.jpeg CB012FC9-2B26-42AE-A453-7D7174DF4E1E.jpeg](https://www.satellites.co.uk/data/attachments/101/101656-480f8dfacaf1899129ab7eb935c95df9.jpg)
If they our I have cut my wire to the wrong length![DOH! :-doh :-doh](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
![CB012FC9-2B26-42AE-A453-7D7174DF4E1E.jpeg CB012FC9-2B26-42AE-A453-7D7174DF4E1E.jpeg](https://www.satellites.co.uk/data/attachments/101/101656-480f8dfacaf1899129ab7eb935c95df9.jpg)
If they our I have cut my wire to the wrong length
NO, the 1/4 wavelength for 137.5 MHz (center of the band we need to use) is 54.545 CM or 545.45 MM@Analoguesat @Terryl do these figures look right for 137.500
View attachment 115932
If they our I have cut my wire to the wrong length![]()
http://www.onlineconversion.com/frequency_wavelength.htm
Not bad, the drop outs to the North and South are due to the directionality of the antenna, the "V" type antenna is directional, not much in the way as to an omni directional antenna for right hand or left hand circular polarized signals has been found to work right. (home brew stuff that is)The antenna isnt performing very well but Ive managed to get a partial picture. I dont think this is too bad for a first proper attempt
View attachment 115933
Not bad, the drop outs to the North and South are due to the directionality of the antenna, the "V" type antenna is directional, not much in the way as to an omni directional antenna for right hand or left hand circular polarized signals has been found to work right. (home brew stuff that is)
I'm looking at a design that looks like a barbers pole, (twisted dipole) will post results when it gets built.
http://lna4all.blogspot.hr/2015/11/diy-137-mhz-wx-sat-bp-filter.html
https://www.radioworld.co.uk/rg8_mini_coax_100m_drum_of_mini-8_50_ohm_coaxial_cable?query=coax&page=3