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Here are the first submissions to the terminology page.

See it at

Kevin

How about adding "Reverse Burst" and it's explanation. I have had it
explained a time or two, but just can't seem to grasp the concept.
Marvin.

Reverse burst was used in the Olden Golden days of yore, when we used
mechanical tuned reeds to decode and encode CTCSS tones. These reeds would
keep running for a short time and the radio would be on open squelch, and
you would hear the noise squelch close with a "Ker-Chunk"

The reverse burst turned the CTCSS tone around 180 degrees and this caused
the reeds to slam to a stop, causing the receiver squelch to shut before
the user heard any "Ker-Chunk"


RUS Receiver Un-squelched
COS Carrier Operated Switch (sometimes called Carrier Operated Squelch)

All standard squelch circuits have a section that will switch a voltage on
or off when the squelch is opened. These voltages mute the receiver,
sometimes in concert with a tone decoder.

These voltages can also feed a COS or COR unit that amplifies this voltage
and then sends a control signal (voltage) to a repeater controller or in
the tube days the COR contacts would key the transmitter in a repeater. By
adding a large capacitor on the relay coil circuit you could add a small
amount of delay keeping the transmitter keyed when the receiver was
receiving a weak signal that was dropping out.

The COR was built with a tube 12AT7 (can not remember for sure) that took
the small voltage from the receiver squelch and amplified it to turn the
second side of the tube into a switch controlling the relay in the plate
line of that tube section.

In the early 1960s I worked on Motorola Sensicon A gear that had been
built in the late 40s with just such a system. We had a remote base
station on the mountain top with a 35 Mhz receiver and a 43 Mhz transmitter
controlled by a 72 and 75 MHz link radios, full duplex.


Rick Sohl KK5RIC

Marvin Munster wrote:

From: Marvin Munster <mmunster@...>

How about adding "Reverse Burst" and it's explanation. I have had it
explained a time or two, but just can't seem to grasp the concept.
Marvin.

At 10:34 PM 2/21/99 -0500, you wrote:

From: "Kevin K. Custer W3KKC" <kuggie@...>

Here are the first submissions to the terminology page.

See it at

Kevin

Marvin,