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Finding Tetra uplink/downlink frequencies

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oe5kbo

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Hallo community i need help. I try to find the Tetra signal uplink with my analyzer. If a tetra radio sent the signal, their is a uplink and a downlink signal by the tetra radios. How i can find the different between uplink and downlink signal...?????
If a emercency car drive infront of me, they have 380 to 385 mhz uplink and the downlink 400 to 450 mhz

With 'Spectrum Analyzer should i find the signal. Please anyone have already find Signals with spectrum Analyzer upload signal, please sent me your impressions about it. Thanks karl
 

Ubbe

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They can have different split between up and downlink., but in EU it's usually +10MHz for downlink.

/Ubbe
 

Ubbe

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It depends of antenna and the terrain. Impossible to say. Also the tetra mobile and portable will reduce its power when their receive signal from the tower are stronger. A mobile station that are capable of 10watt are seldom in full power mode. It will be in 1watt and 0,1watt most of the time. When I tested a portable radio 1km from the tower it was using 0,01watt.

I use a 13dBi yagi and a 10dBi vertical antenna and have never seen an uplink signal. The motorway are 1/2km away and I have a tetra tower 2km away that makes all vehicles on the motorway that passes me to probably run in 10mW mode.

/Ubbe
 
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