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[aprssig] FindU Telemetry page - Help needed

Mark Cheavens mcheavens at usa.net
Fri Oct 10 19:25:30 UTC 2008


I am trying to work with the telemetry page on FindU. I have a 
telemetry value that requires the attached math to make it display 
the way I want. I haven't figured out how to make the math work to 
get it to display correctly. Any help would be appreciated.

Sample URL: 
http://www1.findu.com/cgi-bin/tele1.cgi?call=PURG&last=96&param=1&b=1.0&label=Purg_Repeater_Cabinet_Temp&units=Temperature&autorange=1

I am reading telemetry parameter 1.

I need to take the value (Currently sitting on my bench in an air 
conditioned room!) with a value of 148

I would LIKE to have the value in Degrees F (I know that C would be 
easier).....

So here is the formula:

((Telemetry + Correction Factor) X 1.9608 Sensor Multiplier - 273.15) 
* 5 / 9 - 32 = F

For this install the correction factor is 4.7.
1.9608 is the sensor multiplier (Constant)
The rest if just the basic math...

OR ((148-4.7)*1.9608-273.15)*9/5+32=TempF

I don't understand how the a= b= and c= can get me there!
http://www.findu.com/cgi.html#tele1

Any help would be appreciated!

(I have figured out the easy linear ones in the past - Like this same 
one for voltage -
http://www1.findu.com/cgi-bin/tele1.cgi?call=PURG&last=96&param=2&b=.072254&label=Purg_Batt_Voltage&units=volts&autorange=1

(FYI - This is the output of an OpenTracker+ being used in an outdoor 
solar only radio site (Emergency Clinic) to record interior 
temperature for the batteries and battery voltage. - I do have it on 
the status line, but I don't like the resolution, and would like to 
plot it like I have done for the voltage) http://map.findu.com/purg


Mark
KC5EVE






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