FST-410 FM Stereotransmitter

 price: 1265
nominal dollars

* An FM-stereotransmitter is intended for channel   broadcasting of the FM-range with output power of 10 W
* It can be used as FM-signal shaper for FST-420,   FST-427, FST-430 transmitters

Product specifications
Audio signal range 20...15000 Hz
Pilot tone frequency 19 kHz
Transient attenuation between stereo channels 25...40 dB
Input audio signal level when 1 dB scaling -10...-16 dB/V
Audio signal preemphasis time constant 155 μs
Frequency output 65,9...74 MHz
87,5...108 MHz
Frequency output tuning step 0.1 MHz
Frequency output setting time after tuning not more 10 s
Rated-output power 10 W
Output level attenuation control limits -20...0 dB
Maximum allowable SWR of connected antenna-feeder path 1,7
Output connector N-type
Supply 220V/0.5A
Dimensions 483x88x288 mm
Weight 5 kg

A recommended field intensity in a receiving point when FM stereo broadcasting (according to CCIR) taking in account such obstacles as elevations, buildings, etc. is ≈ 60dB/µV. The diagram from Federal Communications Commission, USA given below enables defining one value out of three: power, height and reception distance when having two known values. The diagram is built for the transmitter with a 100W power. Nevertheless it is possible to use the diagram when having other powers by changing values of reception levels by a dB value. Your power (in dB) differentiates from a 100W power in this dB value. Thus when having a 150dB/µV - 109 ≈ 41dB/mW ≈ 10W output level of a transmitter signal level lowers in a receiving point by 10dB relatively to the level provided by the transmitter with a 100W power. As far as the demanded reception level is 60dB/µV it is necessary to mark a 70dB/µV reception level on the diagram. It results in a 3km area coverage radius having the antenna height of 30m (actually it can result in a greater radius).