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 |
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).