This FM transmitter project was started
back in 1991 and completed sometime around 1993, long before IT Group
was legally registered as a company in Romania. The original business
idea was to target the east-European FM radio stations market which at
that time was totally untapped, but the project eventually succumbed to
the perennially corrupt Romanian bureaucracy (and, sure enough, Marconi,
Philips and the likes happily seized the opportunity and hit the jackpot
all over eastern Europe). Interestingly enough though, FM technology
didn't really change at all since the early nineties (except only for
the disappearance of the eastern-block
OIRT
standard), so the modules developed for this project remain
technologically valid to this day.
Digital synthesis exciter, programmable frequency,
dual band OIRT/CCIR
- programmable frequency (decimal rotary switches, or up/down/set
buttons with 7SD)
- wide band PLL
- direct synthesis (no frequency multipliers from FM oscillator to
output)
- dual band
- OIRT: 66.00 - 73.99 MHz
- CCIR: 88.00 - 107.99 MHz
- stereo encoder
- RF output: 1 Watt / 50 Ohm
Wide band tank, CCIR band
- wide band RF amplifier
- RF input: 1 Watt / 50 Ohm
- RF output: 100 Watt / 50 Ohm
- VSWR and thermal
protection
Digital synthesis exciter, factory-preset
frequency, OIRT band (obsolete)
- factory-preset frequency
- narrow band PLL
- narrow band analog RF multipliers (two stages, x3 each stage, x9
total)
- analog tuning of the RF stages
- OIRT band: 66.00 - 74.00 MHz
- mono, but accepts stereo MPX
- RF output: 1 Watt / 50 Ohm