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USER MANUAL V0.82 

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TCM 300 / 300C / 320 / 320C User Manual V0.82  |  Page 24/43 

 

 

TCM 300 / 300C / 320 / 320C 

 

Isolation material may brake at temperatures below -15 °C.  
Please take care to fix the antenna cable in case vibrations are expected. 

3.3.2  Mounting 50 Ω antennas 
For mounting the receiver at bad RF locations (e.g. within a metal cabinet), an external 50 
Ω antenna may be connected. The whip antenna must be removed in this case! 

 

TCM 320 / 320C provide soldering pads for an SMA connector, e.g. from Tyco Electronics: 
 

 
 

 
 
 

 
 

 
 

 
 

 
 

 
 
 

 
 

 
 

 
 

 
 
 

 
 

 
 

Modification procedure: 

„ 

TCM320: Remove whip antenna and mount SMA connector 

„ 

TCM320C: Remove whip antenna and 12pF capacitor. Then mount SMA connector 

 

 

For 315 MHz modules (TCM 300C and TCM 320C) please note that a full approval 
is needed if modules are used with external antennas. 

 

When using the SMA connector pads please make sure no mechanical forces are 

exerted on the 16-pin connector! It is recommended to use a strain relief for that 
purpose. 

50Ω