HC-265 Voice Scrambler
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.
|HC-265 HFHigh Frequency (3-30 MHz) 2x120Bd||HC-265 HFHigh Frequency (3-30 MHz) 1x300Bd||HC-265 UHFUltra High Frequency (300-3000 MHz) 2x240Bd|
- 23 April 2015 @ 14.3974MHz:
- HC-2650 Radio Encryption Unit
- RadioScanner.RU HC-265
- Cryoto Museum Hagelin Crypto Devices
- Crypto AG Data Modems Encryption Datasheet