07-07-2017, 08:02
That's fantastic, Palmy.
A quick update. My band pass filter arrived and I placed it on the transmitter, unfortunately the birdie I am receiving on 144MHz did not go away. My VNA cannot measure as high as 433MHz so I have no way to verify if the band pass filter does indeed have 50+dB of attenuation at 144MHz. I will assume it does so we can conclude that the birdie is not being transmitted via the antenna.
Not quite sure what to do at this point. It wouldn't hurt to add some ferrite cores to the solar panel leads. The charge controller is supposed to be RFI free, but who knows? Will have to do things one step at a time until I find the offending device. Eventually the 144MHz yagi will be far above the weather station so it wont be in the near field and likely the birdie will be attenuated by a significant amount. Until then I will have to live with it until I can figure it out.
A quick update. My band pass filter arrived and I placed it on the transmitter, unfortunately the birdie I am receiving on 144MHz did not go away. My VNA cannot measure as high as 433MHz so I have no way to verify if the band pass filter does indeed have 50+dB of attenuation at 144MHz. I will assume it does so we can conclude that the birdie is not being transmitted via the antenna.
Not quite sure what to do at this point. It wouldn't hurt to add some ferrite cores to the solar panel leads. The charge controller is supposed to be RFI free, but who knows? Will have to do things one step at a time until I find the offending device. Eventually the 144MHz yagi will be far above the weather station so it wont be in the near field and likely the birdie will be attenuated by a significant amount. Until then I will have to live with it until I can figure it out.