Author Topic: Software Defined Radio with the WS-2902A  (Read 4573 times)

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Offline RdRocket16

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Re: Software Defined Radio with the WS-2902A
« Reply #75 on: June 06, 2019, 11:09:08 AM »
Hey All,
Im 'reopening' this as Im having stability issues with my 2902 array in RTL433.
Here are my settings.
cmd = rtl_433 -M utc -F json -R 78 -R 113 -f 914890000
It works GREAT for all of my WH31 and WH25 devices. but Im having a hard time keeping my WH65 reporting. Its unfortunately sporadic, as the last 2 days its been really good. Im using a home made full loop antenna and it was solid. then this AM i checked and somewhere after midnight it just stopped reporting. I havent been able to get it back. I can see all 9 of my WH31/32 sensors but the WH65 isnt there. My 2 consoles (2902a and 2000) both see it fine, and are reporting to ambientweather.net so i know its up..
any suggestions on maybe how to fine tune my frequency or parameters to get better stability?
You can see my others are reporting solidly.
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And then this one just stopped last night after 2 solid days
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Offline StephenR0

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Re: Software Defined Radio with the WS-2902A
« Reply #76 on: June 06, 2019, 12:06:58 PM »
I see that you're using my value for -f.  I determined that experimentally for my situation.  Unless you have some reason to use a different value, I would use -f 915000000.  Now, if you're using one of the cheap SDR dongles, you probably should figure out a -p value to compensate for how far off your dongle is from the actual frequency.  I did that with a gui program (HDSDR) and my closest NOAA weather radio station.  You need to let your dongle warm up so the frequency can stabilize.  You can find yours here:

https://www.nws.noaa.gov/nwr/coverage/station_listing.html

I do have a couple of questions.  How far from your antenna is your WH65B?  Did the outage coincide with rain and wet weather by any chance?

Edit:  Never mind about the rain.  If your consoles see the WH65B, it can't be that.
« Last Edit: June 06, 2019, 12:11:40 PM by StephenR0 »

Offline RdRocket16

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Re: Software Defined Radio with the WS-2902A
« Reply #77 on: June 06, 2019, 02:37:40 PM »
yeah i did that based on some responses here, and just experimentally, finding that the 914.88 was fairly solid, and found blips around there with GSPX.
one thing im wondering is if the WH65 is more sensitive to time drift, than the WH31? ie: runs well when its been just started, but after 72, 96 hours the clock drifts enough that it starts missing the wh65 somehow?
I dont have a hard clock which i know was one of the things the SDRs like and and yet lack on Pi.

Offline RdRocket16

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Re: Software Defined Radio with the WS-2902A
« Reply #78 on: June 06, 2019, 02:40:07 PM »
someone else mentioned to use the -M level to get the center frequency its picking up which was this :
Found Rafael Micro R820T tuner
Exact sample rate is: 250000.000414 Hz
[R82XX] PLL not locked!
Sample rate set to 250000 S/s.
Tuner gain set to Auto.
Tuned to 914.900MHz.
{"time" : "2019-06-06 18:38:54", "model" : "AmbientWeather-WH31E", "id" : 47, "channel" : 5, "battery" : "OK", "temperature_C" : 27.000, "humidity" : 53, "data" : "b500000000", "mic" : "CRC", "mod" : "FSK", "freq1" : 914.956, "freq2" : 914.886, "rssi" : -0.106, "snr" : 34.257, "noise" : -34.363}
{"time" : "2019-06-06 18:38:54", "model" : "AmbientWeather-WH31E", "id" : 47, "channel" : 5, "battery" : "OK", "temperature_C" : 27.000, "humidity" : 53, "data" : "b500000000", "mic" : "CRC", "mod" : "FSK", "freq1" : 914.956, "freq2" : 914.886, "rssi" : -0.106, "snr" : 34.257, "noise" : -34.363}
{"time" : "2019-06-06 18:39:07", "model" : "AmbientWeather-WH31E", "id" : 94, "channel" : 8, "battery" : "OK", "temperature_C" : -15.300, "humidity" : 69, "data" : "8700000000", "mic" : "CRC", "mod" : "FSK", "freq1" : 914.969, "freq2" : 914.886, "rssi" : -5.777, "snr" : 26.824, "noise" : -32.602}
{"time" : "2019-06-06 18:39:07", "model" : "AmbientWeather-WH31E", "id" : 94, "channel" : 8, "battery" : "OK", "temperature_C" : -15.300, "humidity" : 69, "data" : "8700000000", "mic" : "CRC", "mod" : "FSK", "freq1" : 914.969, "freq2" : 914.886, "rssi" : -5.777, "snr" : 26.824, "noise" : -32.602}
{"time" : "2019-06-06 18:39:15", "model" : "Fine Offset Electronics, WH25", "id" : 224, "temperature_C" : 25.400, "humidity" : 65, "pressure_hPa" : 996.500, "battery" : "OK", "mic" : "CHECKSUM", "mod" : "FSK", "freq1" : 914.956, "freq2" : 914.837, "rssi" : -0.129, "snr" : 35.025, "noise" : -35.154}
{"time" : "2019-06-06 18:39:29", "model" : "Fine Offset WH65B", "id" : 10, "temperature_C" : 28.200, "humidity" : 51, "wind_dir_deg" : 296, "wind_speed_ms" : 0.319, "gust_speed_ms" : 0.510, "rainfall_mm" : 717.804, "uv" : 3110, "uvi" : 8, "light_lux" : 103323.000, "battery" : "OK", "mic" : "CRC", "mod" : "FSK", "freq1" : 914.949, "freq2" : 914.884, "rssi" : -12.144, "snr" : 14.685, "noise" : -26.829}
{"time" : "2019-06-06 18:39:32", "model" : "AmbientWeather-WH31E", "id" : 232, "channel" : 3, "battery" : "OK", "temperature_C" : 25.700, "humidity" : 67, "data" : "9c00000000", "mic" : "CRC", "mod" : "FSK", "freq1" : 914.954, "freq2" : 914.886, "rssi" : -10.787, "snr" : 21.815, "noise" : -32.602}
{"time" : "2019-06-06 18:39:32", "model" : "AmbientWeather-WH31E", "id" : 232, "channel" : 3, "battery" : "OK", "temperature_C" : 25.700, "humidity" : 67, "data" : "9c00000000", "mic" : "CRC", "mod" : "FSK", "freq1" : 914.954, "freq2" : 914.886, "rssi" : -10.787, "snr" : 21.815, "noise" : -32.602}

Offline StephenR0

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Re: Software Defined Radio with the WS-2902A
« Reply #79 on: June 06, 2019, 05:54:41 PM »
You mentioned that you're using a full wave loop antenna.  You might want to play around with orientation of that antenna.  I think it has nulls from the center of the loop in each direction.  You may find an angle that helps.

Offline RdRocket16

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Re: Software Defined Radio with the WS-2902A
« Reply #80 on: June 06, 2019, 06:15:29 PM »
Thats what i was doing, but once i found a direction that worked well, i left it there, then 2 days later, in the same spot, it just stops receiving?
I switched out my SDR to my 'better' one - "NooElec NESDR Smart - Premium RTL-SDR w/Aluminum Enclosure, 0.5PPM TCXO, SMA Input."
I bought it thinking it would work better but i couldnt find my frequency. Turns out its much close to true than the plastic encased one. So now that i dialed that one in, with the single pole antenna, ill leave it for a couple days and see how it does. Hopefully itll help. now Im at 914.950mhz and picking up almost everything.

Offline StephenR0

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Re: Software Defined Radio with the WS-2902A
« Reply #81 on: June 06, 2019, 06:53:57 PM »
Another thing that I've read is to put an extender cable between the dongle and the pi.  The theory is that the pi is noisy and getting the dongle away from the pi can help.  I have not tested this, however.

Offline RdRocket16

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Re: Software Defined Radio with the WS-2902A
« Reply #82 on: June 06, 2019, 07:10:44 PM »
Strangely with my fight aware sdr I had to add an extender. Hmm

Offline bthoven

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Re: Software Defined Radio with the WS-2902A
« Reply #83 on: June 06, 2019, 08:43:13 PM »
This works well with my 433Mhz misol wh24 wh25. WH24 is 20+ meters away through walls.

Sent from my POCOPHONE F1 using Tapatalk

Offline RdRocket16

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Re: Software Defined Radio with the WS-2902A
« Reply #84 on: June 10, 2019, 03:26:14 PM »
I do have a couple of questions.  How far from your antenna is your WH65B?  Did the outage coincide with rain and wet weather by any chance?

Edit:  Never mind about the rain.  If your consoles see the WH65B, it can't be that.

Soooooo
Rained today.
about 2 hours after it started to rain... weewx / rtl_433 no longer sees (or sees very sporadically) my WH65. All the WH31 i have are fine.
whats about the rain i should know?
Batteries in the WH65 are just alkalines from Dec, think i should upgrade to lithiums? Consoles both still see the array though.

Offline StephenR0

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Re: Software Defined Radio with the WS-2902A
« Reply #85 on: June 10, 2019, 04:34:29 PM »
The key question is can your consoles see the WH65B?

It seems that some WH65B units in the past have had some trouble in wet weather.  I believe it's related to condensation on the main circuit board in the unit.  My first one couldn't transmit whenever it rained.  Since it was in the first 30 days, they graciously sent me a second WH65B.  This one has been quite reliable.  However, I did have one instance where the weather was very wet and cold.  A mixture of rain and snow was falling.  My unit quit transmitting for about three hours.  I wrote to them about it and they mentioned that I had a year warranty.  Since it's only happened once, I'm not sure that I'm going to bother with it.  Apparently, they have addressed this problem in later units.  There's something called conformal coating that is used to water proof boards.  I have something called liquid electrical tape that I might try, as well.  In any case, this can only be the problem if your consoles lose the WH65B at the same time.  And I think you should definitely use lithiums instead of alkalines, although at this time of year I would think the super capacitor is getting enough charge to carry things.

Offline RdRocket16

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Re: Software Defined Radio with the WS-2902A
« Reply #86 on: June 12, 2019, 11:00:36 AM »
so i remade my full loop antenna, and use solder this time instead of 12g copper wire. Much easier to measure and cut to length. I also used the SMA connector antenna i had instead of the mcx, and that allowed me to use the SMART SDR instead of the plastic one.
As soon as I ran RTL_433 i started to pick up the station again. its angled @ 90 degrees to my old one, so its horizontal instead of vertical. been solidly collecting for 36 hours (last one went for 96 so Im still hesitant to say its better but...).

Offline StephenR0

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Re: Software Defined Radio with the WS-2902A
« Reply #87 on: June 12, 2019, 11:33:40 AM »
I'm glad you're experimenting with the full wave loop antenna.  I hadn't really considered horizontal, but larger versions do seem to be mainly horizontal, maybe because of room to install it.  I should try that.  You haven't yet answered my question about how far from your antenna your WH65B is.  Mine is really close, about ten feet.  So, as long as the WH65B is transmitting, my antenna is going to receive it.  The WH25 is another story.  The other thing that I ran into is that the WH25 seemed to go through its batteries kind of quickly.  I'll have to see how long this set lasts.  Let the experiments continue!  :-)