Skip to content
A 35-4400 MHz CW exciter design (PCB and firmware)
Branch: master
Clone or download
Fetching latest commit…
Cannot retrieve the latest commit at this time.
Type Name Latest commit message Commit time
Failed to load latest commit information.

LA1K CW beacon project

A 35-4400 MHz CW exciter design on a 75 x 45 mm 4-layer PCB. Will initially be used for a 70 MHz beacon in Norway (with a 25 W PA and an external 10 MHz OCXO), and eventually replace hardware in our existing 2m and 70cm beacons. A serial port is used for configuration of callsign, ramp time, frequency etc.

First PCB soldered

  • Microcontroller (Microchip PIC18F26K22): Controls synthesizer, does CW timing, controls VGA gain.
  • Synthesizer (Analog Devices ADF4351): Fractional-N synthesizer with VCO which generates the RF-signal. Only course control over output power.
  • VGA (Analog Devices ADL5330): Amplifier with variable gain over a 60 dB span. Controlled by filtered PWM-signal from microcontroller and softens the keying transitions by controlling output power ramping. Also works as a buffer for an external PA.
You can’t perform that action at this time.
You signed in with another tab or window. Reload to refresh your session. You signed out in another tab or window. Reload to refresh your session.