Technical data

VHF/AM RADIO FSG 2T
3 Installation
June 2014 FAV_D10048 21
c) The correct microphone level setting is achieved when – slightly time delayed – the
front signaling LED changes from RED to flickering YELLOW, while speaking in
Transmit Mode loud, clear and close to the microphone transducer element.
5. Although due to the specific voice processor compression of modulation peaks, when
tested with maximum sine wave modulation signal, a conventional testing of
"standard modulation distortion measurements" is possible. This does however refer
only to sine waveform testing. It will therefore result in higher than the usual
2% ... 10% sinus modulation distortion, but will stay far below the maximum allowed
25% modulation distortion factor with sinus modulation.
6. Therefore, judgment of the effectively occupied total transmitter band width (spectrum
mask) is the only true, real measurement method. Such measurements can be made
only with specific test setup. However, the front LED assists optically.
7. For tests of the FSG 2T modulation capability, a sine modulation signal is useful only at
or below some 85% AM depth, and is on the other hand helpful only in determining of
possible overmodulation, but is not applicable to judge "voice distortion" anymore.