>>Reverse burst is one of my favorite topics! The TS-64 is probably.
>>designed to operate on the more common of the two standard reverse burst
>>formats, privately referred to as "Kenwood and the Rest of the World"
>>format. This format shifts the phase of the CTCSS tone by 180 degrees
>>for about 150 milliseconds. The other format, used exclusively by
>>Motorola, shifts the CTCSS tone phase by 120 degrees for about 180
>>milliseconds
We pulled out the ol' Micor manual and took a look at the reed circuits.
The reverse burst phase shift might more accurately be called a 240-degree phase shift because it's caused by the reed inductor and a series resistance that keeps the Q high. The encoder likewise generates a 240-degree phase shift with the reed inductor and an switchable RC circuit.
No guess as to whether this was done intentionally to make it different from competitors or that was simply the phase shift that resulted from that particular design. It's interesting to hear that the 240-degree and 180-degree systems are so incompatible.
Since the TS-32 is no longer made (which didn't encode reverse burst or shorten its decode time on receipt of reverse burst), and the TS-64 is its replacement (which does handle RB both directions), it would appear that 180-degree RB has become a desirable feature in aftermarket CTCSS modules.
73,
Bob, WA9FBO
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