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VK3YE’s AGC circuit for ubitx

AGC for ubitx 259x300 VK3YE’s AGC circuit for ubitx
VK3YE’s AGC circuit for ubitx

 

 

 

VK3YE’s AGC circuit for ubitx

An ubitx AGC board is a circuit board that can be installed in a ubitx transceiver to provide automatic gain control (AGC). AGC is a feature that automatically adjusts the gain of the transceiver’s amplifier to maintain a constant audio output level, regardless of the strength of the received signal. This can help to prevent clipping and distortion. It can also improve the overall sound quality of the transceiver.

There are a number of different AGC boards available for the ubitx. Some of these boards are designed to be installed by a qualified technician. The cost of an AGC board varies depending on the features and the manufacturer.

AGC board for ubitx VK3YE’s AGC circuit for ubitx

VK3YE’s AGC circuit uses a conventional audio AGC circuit which drives a LED that is optically coupled to a Light Dependent Resistor  (LDR). As the signal rises the LED emits lighter and the LDR’s resistance drops. The LDR is connected in parallel with the volume control.  In effect, an automatic volume control. As Drew VK3XU once wrote, ‘neat, not gaudy’. A meter connected in series with the LED via a current limiting resistor becomes an effective S-meter. Circuit function depends on using an LDR with an appropriate resistance range.

 

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