Difference between revisions of "LMS-6 Radiosonde"

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(SENS1 table; cleanup other SENS inputs)
(Connector table cleanup)
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==Connectors==
 
==Connectors==
 +
There are four sensor connectors (SENS''N'') used for sensor input by the radiosonde.  SENS1 is not populated on the 403MHz units.  SENS2-4 have leads connected to them, and the sensors are connected to the other end of the leads, outside of the radiosonde housing.  Only SENS1 appears to have spacing for a connector; the others have arbitrary lead spacing.
 
{| class="wikitable"
 
{| class="wikitable"
 
|+SENS1 - 7-pin, 0.1" header spacing
 
|+SENS1 - 7-pin, 0.1" header spacing
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|GND?
 
|GND?
 
|}
 
|}
 +
Public information shows this header can be used for adding additional analog sensors to the radiosonde.
 
{| class="wikitable"
 
{| class="wikitable"
 
|+SENS2 - Humidity
 
|+SENS2 - Humidity
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|Sensor pin 2
 
|Sensor pin 2
 
|}
 
|}
−
 
+
0.3" spacing.  Both lead wires have ferrite beads immediately before connecting to the board.
 
{| class="wikitable"
 
{| class="wikitable"
−
|+SENS3 - Temp Sensor (standalone)
+
|+SENS3 - Temp. Sensor (standalone)
 
!Pin
 
!Pin
 
!Connection
 
!Connection
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|Sensor pin 2
 
|Sensor pin 2
 
|}
 
|}
−
 
+
0.5" spacing.
 
{| class="wikitable"
 
{| class="wikitable"
−
|+SENS4 - Temp Sensor (humidistat)
+
|+SENS4 - Temp. Sensor (humidistat)
 
!Pin
 
!Pin
 
!Connection
 
!Connection
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|}
 
|}
  
−
<br />
+
0.3" spacing.  Fine gauge insulated wire run along SENS3 wire and loomed in white heat-shrink tubing.<br />
 
{| class="wikitable"
 
{| class="wikitable"
 
|+Card edge - 40-pin, looks like ISA spacing
 
|+Card edge - 40-pin, looks like ISA spacing
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−
J4 - NC - earphone jack? uses SENS3 leads
+
'''J4''' - NC - earphone jack? uses SENS3 leads
−
 
+
{| class="wikitable"
−
J5 - 4-pin 0.1 - to U3 (STM)
+
|+J5 - 4-pin, 2.0mm spacing
−
 
+
!Pin
−
SP1 - 2x4pin 0.1 - tu U14 (SPI mem?)
+
!Use
 +
|-
 +
|1
 +
|Unknown
 +
|-
 +
|2
 +
|Unknown
 +
|-
 +
|3
 +
|Unknown
 +
|-
 +
|4
 +
|Unknown
 +
|}
 +
These traces go to U3 (ST microcontroller)
 +
{| class="wikitable"
 +
|+SP1 - 2x4-pin, 0.1" spacing
 +
!Pin
 +
!Use
 +
|-
 +
|1
 +
|Unknown
 +
|-
 +
|2
 +
|Unknown
 +
|-
 +
|3
 +
|Unknown
 +
|-
 +
|4
 +
|Unknown
 +
|-
 +
|5
 +
|Unknown
 +
|-
 +
|6
 +
|Unknown
 +
|-
 +
|7
 +
|Unknown
 +
|-
 +
|8
 +
|Unknown
 +
|}
 +
These traces go to U14 (SPI mem?)
  
 
==Components==
 
==Components==

Revision as of 01:53, 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

There are four sensor connectors (SENSN) used for sensor input by the radiosonde. SENS1 is not populated on the 403MHz units. SENS2-4 have leads connected to them, and the sensors are connected to the other end of the leads, outside of the radiosonde housing. Only SENS1 appears to have spacing for a connector; the others have arbitrary lead spacing.

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?

Public information shows this header can be used for adding additional analog sensors to the radiosonde.

SENS2 - Humidity
Pin Connection
1 Sensor pin 1
2 Sensor pin 2

0.3" spacing. Both lead wires have ferrite beads immediately before connecting to the board.

SENS3 - Temp. Sensor (standalone)
Pin Connection
1 Sensor pin 1
2 Sensor pin 2

0.5" spacing.

SENS4 - Temp. Sensor (humidistat)
Pin Connection
1 Sensor pin 1
2 Sensor pin 2

0.3" spacing. Fine gauge insulated wire run along SENS3 wire and loomed in white heat-shrink tubing.

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, 2.0mm spacing
Pin Use
1 Unknown
2 Unknown
3 Unknown
4 Unknown

These traces go to U3 (ST microcontroller)

SP1 - 2x4-pin, 0.1" spacing
Pin Use
1 Unknown
2 Unknown
3 Unknown
4 Unknown
5 Unknown
6 Unknown
7 Unknown
8 Unknown

These traces go to 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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