RF Transmitter HFS 27 / 35
The RF transmitter type HFS.. is part
of the intrinsically safe underground
radio system MR90 and is used for
frequency modulation with the LF
The HFS27 is a frequency modulated
RF transmitter with a transmitter
frequency range of 26,5 to 27,5 MHz.
There are 21 transmit channels selectable.
The channel spacing is 50 kHz.
It is used for the mobile station
of the MR90 radio system.
The HFS35 also is a frequency
modulated RF transmitter.
Both transmitters are in principle
equal in mechanical and electrical
The transmitter circuit is redesigned
merely for an operation in the
35 MHz band. Here are also 21 transmit
channels selectable with a channel
spacing of 50 kHz. The HFS35 is used
for the base station.