HC-265 Voice Scrambler

HC-265 Voice Scrambler
Frequencies	3 MHz,30 MHz
Frequency Range	3 MHz - 30 MHz
Mode	USB
Modulation	FSK
ACF	—
Emission Designator	—
Bandwidth	2.25 kHz,3 kHz
Location	Worldwide
Short Description	HC-265 is a Voice Scrambling mode developed by Hagelin Crypto for their HC-265 CRYPTOCOM secure voice unit.
I/Q Raw Recording	—
Audio Sample

HC-265 is a Voice Scrambling mode developed by Hagelin Crypto AG for their HC-265 CRYPTOCOM secure voice unit.

One key feature of this mode is it's FSKFrequency-Shift Keying preamble and the sync tones during voice transmission. The standard HFHigh Frequency (3-30 MHz) protocol uses two 120Bd FSKFrequency-Shift Keying signals for the preamble. One HFHigh Frequency (3-30 MHz) variation uses one 300Bd FSKFrequency-Shift Keying signal for the preamble. The UHFUltra High Frequency (300-3000 MHz) variation uses two 240Bd FSKFrequency-Shift Keying signals for the preamble.

All HC-265 transmissions use a sync tone that allows the receiver to stay in sync with the transmitter so that the voice message can be properly decoded. You can hear this sync tone in the background of the speech or when the speech is silent. At the end of each transmission there is a FSKFrequency-Shift Keying EOTEnd of Transmission (End of Transmission) signal sent.