Difference between revisions of "LMS-6 Radiosonde"

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(→‎Components: Sens 4 is a capacitive RH sensor)
(→‎Components: Added additional components)
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U3 - 72F324J6T6 - ST72324  - Main Microcontroller, ST7 series
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U3 - [http://web.archive.org/web/20200903011648/https://datasheet.octopart.com/ST72F324J6T6-STMicroelectronics-datasheet-14047.pdf 72F324J6T6 - ST72324  - Main Microcontroller, ST7 series]
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U5, U6 - [http://web.archive.org/web/20200206204209/http://www.ti.com/lit/ds/symlink/lp2985.pdf LP2985]
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U?? - [http://web.archive.org/web/20200123234645/https://www.ti.com/lit/ds/symlink/tps72.pdf TPS7201Q]
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[[File:U?? - TPS7201Q.jpg|thumb|193x193px|TPS7201Q on PCB]]
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U13 - [http://web.archive.org/web/20200214104034/http://www.ti.com/lit/ds/symlink/cd4040b.pdf CD4040BPW]
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U14 - [http://web.archive.org/web/20200214042837/http://www.ti.com/lit/ds/symlink/cd74hc4051.pdf CD74HC4051PWR]
  
 
U16 - [http://web.archive.org/web/20190417163532/https://www.ti.com/lit/ds/symlink/lmv761.pdf LMV761]
 
U16 - [http://web.archive.org/web/20190417163532/https://www.ti.com/lit/ds/symlink/lmv761.pdf LMV761]
  
U13 - [http://web.archive.org/web/20200214104034/http://www.ti.com/lit/ds/symlink/cd4040b.pdf CD4040BPW]
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U21 - [http://web.archive.org/web/20190202204556/https://www.ti.com/lit/ds/symlink/cc1050.pdf TI/Chipcon CC1050 (TSSOP 24)]
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U22 - [http://web.archive.org/web/20200223104004/http://www.ti.com/lit/ds/symlink/tps791.pdf TPS791]
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U21 - TI/Chipcon CC1050 (TSSOP 24)
 
  
 
Sens 4 - Capacitive Relative humidity sensor
 
Sens 4 - Capacitive Relative humidity sensor

Revision as of 01:26, 3 September 2020

The LMS-6 Radiosonde is a radiosonde manufactured by Lockheed-Martin Sippican, and used for meteorological sounding.


Overview

There are two models of the LMS-6, a 403MHz model and a 1680MHz model. This article will cover the 403MHz model unless specified.

Specs

  • 16 Fixed transmit carrier frequencies (MHz): 400.250, 400.625, 401.000, 401.375, 401.750, 402.125, 402.500, 402.875, 403.250, 403.625, 404.000, 404.375, 404.750, 405.125, 405.500, 405.875
  • Frequency tolerance +/-30ppm
  • Mean TX Power 70.8mW (18.5dBm)
  • Emission Designator 16K8F1D
  • FSK with a maximum modulating frequency of 4.8 kHz
  • Emission 3dB BW +/-5.0 kHz
  • Emission 20dB BW +/-12.7 kHz
  • Omnidirectional antenna
  • Main beam gain 2dBi
  • Horizontal Beamwidth 360 degrees
  • Vertical Beamwidth +84 degrees

Source: https://apps.fcc.gov/els/GetAtt.html?id=121623&x=.

Photos

Relative Humidity Circuit section


Connectors

sens 1 - NC (7-pin) (baro?)

sens 2 - RH

sens 3 - standalone TC

sens 4 - RH TC

Card edge - 40-pin, looks like ISA spacing

J1 - 4 pin 0.1

- 1 - Black

- 2 - White

- 3 - Red

- 4 - NC

J4 - NC - earphone jack? uses SENS3 leads

J5 - 4-pin 0.1 - to U3 (STM)

SP1 - 2x4pin 0.1 - tu U14 (SPI mem?)

Components

GPS - Trimble 63530-50 s/n 1190122906

   https://www.trimble.com/embeddedsystems/copernicus2.aspx


U3 - 72F324J6T6 - ST72324 - Main Microcontroller, ST7 series

U5, U6 - LP2985

U?? - TPS7201Q

TPS7201Q on PCB

U13 - CD4040BPW

U14 - CD74HC4051PWR

U16 - LMV761

U21 - TI/Chipcon CC1050 (TSSOP 24)

U22 - TPS791


Sens 4 - Capacitive Relative humidity sensor

Notes

U13 Package marking shows CM040B. TI Park marking lookup provides CD4040BPW

U16 Package marking shows C22A. TI Part marking lookup provides LMV761. The SOT-23 footprint appears to match what is on the PCB.

Sens 4 is know to be capacitive since it is listed as such on page 13 of the WMO Common Code Tables Document

Circuits

RF from CC to Ant1 - coming soon