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LDMOS amplifiers

LDMOS amplifiers

Pete (N6QW) writes:

This project encompasses proving an Arduino Control of a hi Power Linear Amplifier. It is a new departure for N6QW as it has extensive I/O requirements which required moving to the Mega 2560 a Arduino variant that has 56 Digital I/O and 16 Analog Inputs. The on board memory is 256K
The current configuration uses a 3×4 Keypad as the main control element.
Key 1 = Power On
Key 2 = Power Off
Key 3 = Amp Bypass [In this mode the LPF’s are disconnected and the amp power is off it requires RESTART and LPF Selection the TR Relay is disconnected so No RF into the amp on Bypass.LED16 Controls whether the amp is bypassed BUT LED 17 and LED 18 control the actual sequencing of the connection of the amp to the antenna system and the transceiver. WE are trying to avoid “hot switching”. Thus the amp is connected to the antenna first and then the transceiver is connected to the amp. This is done by a small delay on the connection of the amp to the input side. Problem solved!]

More info at N6QW Homebrew Radio blog.

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