2米调频144M-148M发射电路

Near-Earth Telemetry
(Morse Code Telemetry)
2 meter FM - 144mHz - 148mHz
Altitude, Temperature and Radiolocation for Small Rockets and Aircraft

Update #1 Modification - the signal output can be significantly improved by replacing C2 with a 22 picofarad capacitor and by adding a 4.7 picofarad capacitor between the collector and emitter of Q1.  This modification was developed using the 49.152 computer crystal (815-ABLS-49.152-B2 from Mouser、com).  It has not been tested with the custom 3rd overtone crystal.  Also, the 4.7 picofarad capacitor is not always required. 

Update#2 - Inexpensive computer crystals can be used in this circuit.  See "transmitter" secession for parts reference or click link.

The following files and "Quick" plans describe a telemetry system consisting of a transmitter with "interchangeable" sensor modules.  Range is 1600 feet (6 ft above ground to 6ft above ground) and 2500 feet air to ground (as measured using a ICOM  IC-W32A HT with the standard 8" antenna.  It might be higher.  This is the maximum altitude tested so far).

This is still a a-work-in-process so your comments will be appreciated. e-mail to   jerry_baumeister@msn、com 

1. The circuit is designed for a printed circuit board (PCB) assembly. The foil patterns are provided in the following plans.  However, other parts layouts may work as well.
2. The system is comprised of a transmitter that plugs into a " control and sensor" (CS) module.  The CS modules carry the battery, microcontroller and the sensors.  Two different CS modules are provided with the following plans.  height=945 src="/data/attachment/portal/201007/ET30989201007221057481.jpg" width=680 border=0>

   Transmitter parts

   

   

   0.9" x 0.6"
   foil side       
   
   reversed

   ResistorsValuePart numberSupplierCommentsR1100K 1/8 watt299-100KMouser R210K 1/8 watt299-10KMouser      Capacitors    C1.001 mF21RX510Mouser C222pF21RD747Mouser C315pF80-C315C150J1GMouser      Semiconductors    Q1NTE107526-NTE107Mouser Q2NTE108526-NTE108Mouser      Crystal    xtal144 – 148 Mhz third overtone series crystalEX45DL00ICM (International Crystal Manufacture) ICM HC-45/U SERIES(FX=20.00-59.99MHZ)xtal49.152 MHz 3rd overtone crystal (Mouser part# 815-ABLS-49.152-B2)Mouseroperates at 147.460 MHzxtal48 MHz series or 48MHz 20 pF  micro processor crystal Mouseroperates at 144.01 MHz Inductors    L10.68 microHenry434-22-R68Mouser L24 turns tightly wound width=96>

   N0-sensor module ( power supply and microcontroller)
   

    
   foil
   
     
   reversed foil
   
     
   1.5" x 0.6"

   
   
   
   foil  3.2" x 0.6"
   
   
   reversed foil

   

   altitude and temperature module

    ValuePart numberSupplierCommentsResistors    R1100K 1/8 watt299-100KMouser R2100K 1/8 watt299-100KMouser R310K 1/8 watt299-10KMouser      Capacitors    C10.1 mF21RX310Mouser C20.1 mF21RX310Mouser C3470 pF80-C315C471J2GMouser C4.01 mF21RX410Mouser C51 mF80-T350A105K025Mouser      Semiconductors    IC1PIC12F675 8- pin FLASH- Based 8-bit CMOS Microcontroller579-PIC12F675-I/PMouser IC2 78L05 5 volt regulator 511-L78L05ABZMouser  Sensors    TX1Thermistor71-01C1002FPMouser TX2

   Absolute pressure sensor 0 – 15 PSI
   Type MPX4115A

   MPX4115A-NDDigiKey Miscellaneous    PCB2 pos SPST dip switch653-A6T-2104Mouser S1 a&b264 single row right angle socket .100”575-643903MouserRemove and use 5 of the headersSocket 64 single row right angle socket .100” 575-643903Mouser Remove and use 5 of the headersHeader2 single row straight header .100”649-69190-202Mouser J1, J2Low-profile shunt jumper649-687886-202Mouser battery12V573-23AMouser battery3 volt lithium658-BR1632Mouser Firmwaretelemetry.asm   PIC 12F675 Programming softwareMPLAB-IDE Microchip PIC 12F675 ProgrammerPICKIT 1 8/14-Pin Flash Starter Kit597-DV164101MouserIncludes MPLAB-IDE