RX FM 137 - 141 MHz 

highly sensitive and selective superhetrodyne receiver

( SATELIT METEOSAT 7, NOAA, METEOR, RESURS... )

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Ing. Miroslav GOLA  OK2UGS , QTH FRÝDEK - MÍSTEK   LOC: JN99EQ

 [email protected]     Aktualizace 21. 04. 2003

 

The following text is meant for advanced hams and it describes assembly of FM receiver for interesting waveband of 137 - 141 MHz, which is used for transmission of images from space (views of the Earth from meteorological satellites located at the distance of 850 km or 36000 km).

Receiver technical data
Frequency Range :   137 - 141 MHz
 Frequency Synthesizer Step:  10,0 kHz or alternately 12,5 kHz
 Input Sensitivity:  0,6uV (rms-type) for 12dB SINAD
 Intermediate Frequency:  10,7 MHz and 455 kHz
 Tone decoder/PLL SE567:  2400 Hz
 Pass band of the 2-st.IF filter:  30 kHz/ - 3 dB or alternately 15 kHz
 Power:  DC 9 V (max.12 V)
 Current output:  70 - 90 mA, according to the loudness level setting
 Power Connector:  3 mm (+ pole is inside of the jack pin, - pole is on its surface!!!)
 Automatic Scanning:  Yes - 2400 Hz stop point - Squelch function controlled by the uP
 Noise Gate ( SQUELCH ):  Yes 
 Antenna Connector:  "1x BNC" type
 Display:  LCD 1 x 16 alpha - numerical  symbols
 Connection for Loud speaker:  (or Headphones) external 8-25 Ohms, CINCH connectors
 Connection for PC:  PIN connectorsor cable from the computer sound card
 Receiver Size:  225x200x70 mm

 

PHOTOGALLERY

 

20_01_rx137141567_stavebnice.jpg
 19_02_rx137141567_dps_bot.jpg
 18_03_x137141567_dps_top_smd.jpg
 17_04_137141567__lc_flt.jpg
16_05_rx137141567_dps_osaz.jpg
 15_06_rx137141567_lc_flt.jpg
 14_07_rx137141567_lcd_panel1.jpg
 13_08_rx137141567_lcd_panel2.jpg
12_09_rx137141567_lcd_panel3.jpg
 11_10_rx137141567_all1.jpg
 10_11_rx137141567_all2.jpg
 09_12_rx137141567_all3.jpg
08_13_rx137141567_zdroj5v.jpg
 07_14_rx137141567_pin567.jpg
 06_15_rx137141567_updown.jpg
 05_16_rx137141567_front.jpg
04_17_rx137141567_zezadu.jpg
 03_18_rx137141567_zepredu.jpg
 02_19_rx137141567_zezadu_bopla.jpg
 01_20_rx137141567_zepredu_bopla.jpg

 

Complete schematic you will find here    

Components layout, top side (bot PCB) here 

 

  

Text here [will issue in periodical VHF Communications 3Q/2002 ]

 

You can order the kit with very detailed assembly instructions and with rich photo documentation of details and complete unit on CD-ROM at our address:

  Ing. Miroslav Gola - EMGO, Areal VUHZ, a.s., Dobra 240, CZ-73951 Dobrá, Czech Republic 

[email protected]   or   [email protected]   

 

You can view current topical information on internet site of the company EMGO...

 

Copyright 2000, 2001, 2002, 2003 [email protected]