I've also seen signal strength drop inexplicably on my Davis Envoy, although I've never correlated it with rain. Sometimes it doesn't come back for days. In those cases, I reset the Envoy by taking the batteries out. Here's one example:
[image: image.png] I should note that I also have a VP2 console. I haven't noticed it happening with the console, but then it only runs occasionally when I'm working on WeeWX. There's definitely no correlation between the console and the Envoy, so it must be a receive-side problem. -tk On Mon, Nov 16, 2020 at 12:03 PM Greg Troxel <g...@lexort.com> wrote: > > Bob DeMattia <b...@demattia.net> writes: > > > Quite a bit of attenuation! The sensor is located approximately 8 feet > > horizontally and fifteen feet vertically > > from the display. It must be the wet roof! > > Not sure what you have for station hardware. That graph suggests Davis > VP2 or Vue, and there I am pretty sure 'signal quality' is a recent > average of the fraction of packets successfully received vs what should > have been received. > > Assuming Davis: > > Davis at the 8'/15' should be very solid. It's 915 MHz, and it is very > slow FH, AIUI one data packet on a frequency and a new frequency for the > next packet rotating among a set of 51 (US). That protects against > narrowband interference. So I am skeptical that this is just due to > increased path loss. > > I don't look at signal strength on my VP2 often, but I used to see a dip > from 100 to 98% occasionally, and the time pattern was suggestive of > some other transmitter, but I haven't figured it out. But it was a > brief dip to 98%, not hours at 25%. I just checked and last night with > the temp peak/rain event it was mostly 99.1/99.9% with an occasional > 97ish%. I can perceive no patterns. Console/sensor distance is > probably 20' horizontal, 10' vertical, so not so different. > > Therefore, I would be suspicious of broadband noise happening because of > the rain, although I admit that at 900 the level needed to explain this > does not make a lot of sense. Speculating wildly and beyond the point > of reason, it could be arcing of a powerline insulator when wet. > Perhaps listen at 450 MHz during the next rain, or at 900 if you have an > SDR set up that can function as a spectrum analyzer (rtlsdr/gqrx?). > > You can also use rtldavis to listen to the packets: > > https://github.com/lheijst/rtldavis > > with an RTL-SDR dongle. That might be useful information. > > Greg > > -- > You received this message because you are subscribed to the Google Groups > "weewx-user" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to weewx-user+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/weewx-user/rmia6vhf4rs.fsf%40s1.lexort.com > . > -- You received this message because you are subscribed to the Google Groups "weewx-user" group. To unsubscribe from this group and stop receiving emails from it, send an email to weewx-user+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/weewx-user/CAPq0zEC_2nAs8x%2B8q1BJQgdyUAQKijSc68QcjOX%2BhjsCU0hf2w%40mail.gmail.com.
