BR-6028

BR-6028
Frequencies	13.4582 MHz,15.937 MHz,5.75 MHz,11.01 MHz,8.045 MHz
Frequency Range	5.75 MHz - 15.937 MHz
Mode	USB
Modulation	FSK
ACF	—
Emission Designator	—
Bandwidth	3.1 kHz
Location	Worldwide
Short Description	BR-6028 is a VFT (Voice Frequency Telegraph) frequency and time diversity modem using 7 data channels. It is sometimes also known as BARRIE, USA-7, or 6028.
I/Q Raw Recording	—
Audio Sample

BR-6028 is a VFTVoice Frequency Telegraphy (Voice Frequency Telegraph) frequency and time diversity modem using 7 data channels. The BR Communications 6029C Modem and MD-1142/UGC Modem supported this signal.

Consists of multiple channels over one audio bandwidth with a pilot tone at ~560 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).. Used by the US Military and Canadian Military, as well as many forces worldwide, in a special BR-6028 specification where each channel signal carries the same information but delayed by one second from the previous one (which can be seen in the ASCII mode image). This helps with error correction. In addition, certain channels which are severely affected by propagation conditions can be entirely turned off, so signals with less than 7 channels can be seen.

In addition, reports have confirmed that a variation of BR-6028 was used by some countries that had Channel 2 entirely turned off, while leaving the rest on.

There are several modulation modes used by BR-6028. The most common one seen is RTTY. BR-6028 has also been seen with ASCII, ARQ-E, and Link-14.

The RTTYRadio TeleTYpe mode uses between 45 and 100 BdBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second., with 170 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). shift in each channel. The ASCII mode uses between 30 and 110 BdBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second., with 150 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). shift in each channel. The ARQAutomatic Repeat reQuestAutomatic Repeat Query-E was reported to run at 46.15 BdBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second. with a 4-character repetition cycle, and the Link-14 one at 75 BdBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second..