pll do Veronica

NRG KITS PLL-PRO 2

Although this model has been replaced with the superieor PLL-PRO 3, it is still a classic example of RF techniques combined with digital counters and gates. Below is a brief description of what goes on in this exciter.

THE PUSH-PULL FREOUENCY DOUBLING OSCILLATOR

This Circuit is the heart of ali the transmitters from both Veronica Kits

and NRG Kits..........Stephen Moss designed this unique Circuit in

1993. It has been icorporated in many different transmitter sizes, from 0.05 watt (50mW) through to 220 watts power output.

The configuration is the same now as it was 1993, because that is the only way it will work.

THE LOGIC CONTROL CIRCUIT

This Circuit monitors the Transmitter freguency accuracv and corrects any drift that may occur due to temperaturę chanqes.

It is also known as a frequency synthesiser because it is programmed from the DIL switches to lock any frequency from 88 -108 MHz

Here we see the Logic Control Circuit used to keep a carefull watch on the freguency accuracy of the Push-Pull Freguency Doubling Oscillator.

THE CONVENTIONAL RADIO FREOUENCY AMPLIFIER CIRCUIT

This Circuit has been around sińce the use of transistor technology became widespread in transmitter design, it is ’Old Hat’ and is invariably the same wherever you look. Rules apply that mean the appearance and the configuration are notf1exible. Iftwo people seperately madę a tranmitter using the tried and trusted conventional circuitry, the results would have to look very similar, if both were going to work correctly.

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