Beacon’s front view. The +9dBi linear polarized antenna is connected with a small length of UT-141 and SMA connectors.
The 10.368GHz beacon is based on W1GHZ’s beacon board. It needs an input of 1152MHz which is provided from a small board with a SI4133 RF synthesizer. The synthesizer is fed with a reference of 24MHz from a homebrew OCXO based on an integrated oscillator. The X band output (approximately 5mW at 10.368.135 ±5KHz) is fed to a homebrew +9dBi antenna. A very handy accessory for the shack and out of it!
Back view. The +12V supply connector and LED are visible. The aluminium plate is also a heatsink for the regulator inside the enclosure.
Internal View. From top to bottom: Multiplier PCB, RF synthesizer PCB and 24MHz OCXO board. The OCXO is connected with RG-174 cable to the synthesizer.
The RF synthesizer is visible in this photo. It is connected using a RG-402 semi rigid coax with the multiplier board. The synthesizer’s output is +10dBm at 1152MHz.
Homebrew 24MHz OCXO board with supply regulators. The resistors next to the SMA connector form an attenuator (the oscillator’s output is TTL level , too much for the SI4133)
OXCO without the thermal insulation. Above the oscillator is the heating element (a transistor) and thermistor which regulates the temperature. The small metal block is from aluminium and serves as a heat buffer. The final frequency stability at 10GHz is excellent after it heats up (takes about 15min).