Difference between revisions of "LMS-6 Radiosonde"

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(→‎Connectors: Updated Card edge connections)
(SENS1 table; cleanup other SENS inputs)
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==Connectors==
 
==Connectors==
 +
{| class="wikitable"
 +
|+SENS1 - 7-pin, 0.1" header spacing
 +
!Pin
 +
!Characteristics
 +
|-
 +
|1
 +
| +5V (5.47 measured)
 +
|-
 +
|2
 +
|GND?
 +
|-
 +
|3
 +
| +4.93V (Microcontroller VCC?)
 +
|-
 +
|4
 +
|1 Hz
 +
|-
 +
|5
 +
|1 Hz
 +
|-
 +
|6
 +
|1 Hz
 +
|-
 +
|7
 +
|GND?
 +
|}
 +
{| class="wikitable"
 +
|+SENS2 - Humidity
 +
!Pin
 +
!Connection
 +
|-
 +
|1
 +
|Sensor pin 1
 +
|-
 +
|2
 +
|Sensor pin 2
 +
|}
  
 +
{| class="wikitable"
 +
|+SENS3 - Temp Sensor (standalone)
 +
!Pin
 +
!Connection
 +
|-
 +
|1
 +
|Sensor pin 1
 +
|-
 +
|2
 +
|Sensor pin 2
 +
|}
  
−
sens 3 - standalone TC
+
{| class="wikitable"
−
 
+
|+SENS4 - Temp Sensor (humidistat)
−
sens 4 - RH TC
+
!Pin
 +
!Connection
 +
|-
 +
|1
 +
|Sensor pin 1
 +
|-
 +
|2
 +
|Sensor pin 2
 +
|}
  
 
<br />
 
<br />
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*
 
*
  
−
J1 - 4 pin 0.1
+
{| class="wikitable"
−
 
+
|+J1 - 4-pin, 0.1" header spacing
−
- 1 - Black
+
!Pin
−
 
+
!Wire Color
−
- 2 - White
+
!Use
−
 
+
|-
−
- 3 - Red
+
|1
 +
|Black
 +
|Ground
 +
|-
 +
|2
 +
|White
 +
|Battery +9
 +
|-
 +
|3
 +
|Red
 +
| +9 VDC In
 +
|-
 +
|4
 +
|NC
 +
|Unknown - goes to
 +
unpopulated CR1
 +
|}
  
−
- 4 - NC
 
  
 
J4 - NC - earphone jack? uses SENS3 leads
 
J4 - NC - earphone jack? uses SENS3 leads

Revision as of 01:09, 5 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

SENS1 - 7-pin, 0.1" header spacing
Pin Characteristics
1 +5V (5.47 measured)
2 GND?
3 +4.93V (Microcontroller VCC?)
4 1 Hz
5 1 Hz
6 1 Hz
7 GND?
SENS2 - Humidity
Pin Connection
1 Sensor pin 1
2 Sensor pin 2
SENS3 - Temp Sensor (standalone)
Pin Connection
1 Sensor pin 1
2 Sensor pin 2
SENS4 - Temp Sensor (humidistat)
Pin Connection
1 Sensor pin 1
2 Sensor pin 2


Card edge - 40-pin, looks like ISA spacing
Pin Number Function
1,2,7,8 U3 - Vdd | U15 - Pin 4
9, 10, 15, 16, 19, 20, 33, 34 Ground
3 U3 - ICCLK | TP33 | U21 - PCLK
4 U3 - Vpp/ICCSEL
5 U3 - RESET
6 U3 - ICCDATA
11 J5 - Pin 2
13 U3 - SW1.4
17 U3 - SW1.2
18 U3 - SW1.1
31 BATT POS
36 U3 - SW1.3
38 U3 - OCMP1_A / AIN10 / PF4
39 RED WIRE
J1 - 4-pin, 0.1" header spacing
Pin Wire Color Use
1 Black Ground
2 White Battery +9
3 Red +9 VDC In
4 NC Unknown - goes to

unpopulated CR1


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


Relative Humidity Circuit

File:Relative Humidity Circuit Schematic.pdf U16 -Input also has a cap to ground not shown on the sketch.

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