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FM Receiver user manual 

 

 

RF Application Co.,Ltd. All rights reserved. Version 1.0                                                      -Page 3- 

Audio Connections

 

Be sure to observe polarity! Speaker. A loudspeaker with an impedance of 8ohms or 

greater should be connected to BNC Female connector. Use of lower impedance speaker or 
shorting of speaker terminal can result in IC damage.  The receiver can also drive higher 
impedances, such as the 1K to 20K input impedances of repeater controller boards. There is no 
need to load down the output to 8 ohms.  

 

 

 

Antenna Connections

 

The antenna connection should be made to the receiver with a BNC Female connector of 

the low-loss type made for RF. If you want to extend the antenna connection to a panel connector, 
we recommend using a short length of RG-174/u coax with the plug and keep the pigtails very 
short. We do not recommend trying to use direct coax soldered to board or another type of 
connector.  The method designed into the board results in lowest loss practical.  

 

 

 

 
 
 
 
 
 
 
 
 

Right audio output 

Left audio output 

Antenna input 

Summary of Contents for RFM-11031K

Page 1: ...eceiver user manual RF Application Co Ltd All rights reserved Version 1 0 Page 1 FM Receiver Model RFM 11031K Model RFM 11032K Model RFM 11033K Model RFM 11034K Model RFM 11035K Model RFM 11036K User Manual ...

Page 2: ... board with 4 holds The receiver board relies on the mounting hardware to provide the DC and speaker ground connections to the ground plane on the board Electrical Connections Power supply should be connected to the connector on the PC board with 4 wire which can be extended to a connector or feed through capacitors used on the cabinet in which it is installed Be very careful not to route the wiri...

Page 3: ...pedances of repeater controller boards There is no need to load down the output to 8 ohms Antenna Connections The antenna connection should be made to the receiver with a BNC Female connector of the low loss type made for RF If you want to extend the antenna connection to a panel connector we recommend using a short length of RG 174 u coax with the plug and keep the pigtails very short We do not r...

Page 4: ...K 330 00 360 00 MHz Model RFM 11036K 400 00 440 00 MHz Model RFM 11037K 440 00 480 00 MHz Sensitivity 12dB SINAD 0 8µV Audio Output up to 1 Watts 8 ohms Operating Power 13 6Vdc at 300 mA Size 100mm W x 93mm D x 22mm H Operation Turn on Be sure that the power source does not carry high voltage or reverse polarity transients on the line since semiconductors in the receiver can be damaged After you t...

Page 5: ...om the current frequency and it will latch onto the new operating frequency Adjustments Frequency correction The frequency from VCO will oscillator as frequency setting The frequency can be error in the long time in use You can adjustment to frequency correction by varicap as the picture as below The VCO will oscillate frequency different from the receiver frequency such as if you want to receiver...

Page 6: ...Page 6 LCD contrast The LCD display can adjust the contrast as picture below Mono Stereo mode You can select of receiver to mono or stereo mode by jumper Stereo and pilot adjustment You can adjust to stereo clearance by potentiometer LCD contrast Mono or stereo Stereo adjustments ...

Page 7: ...short circuit on the somewhere If you clear the short circuit the voltage should rise again Hum and Noise The VCO and loop filter are very sensitive to hum and noise pickup from magnetic and electrical sources Some designs use a shielded compartment for VCO s We assume the whole board will be installed in a shielded enclosure so we elected to keep the size small by not using a separate shield on t...

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