THE FDIM 2025 LOGIC IC TRANSMITTER POWER CHALLENGE!: SDR で BCL を

2024年12月08日

THE FDIM 2025 LOGIC IC TRANSMITTER POWER CHALLENGE!

　QRP ARCI が、2025年に開催される FDIM の課題を発表しました。

2025年の課題も、今年と同じで LOGIC IC TRANSMITTER POWER CHALLENGE! です。

条件は今年と同じです。

The PA must be crystal controlled within the 40M amateur band. One (or more) section of the IC must be a crystal oscillator to control the frequency of the transmitter. Builders are encouraged to use their own crystals, though there will be 7030 kHz HC-49 crystals available at the competition. No external frequency source may be used.
ICs to be used must be of the 4000-series or 7400-series. Different logic families of this type such as 74LSxx, 74HCxx, 54HCTxx etc. may be used.
The circuit must fit inside a 12” x 12” x 12” volume. During the power test, the judges will cover the circuit with a blast shield to protect judges and contestants from flying bits!
All circuit components are to be visible for inspection.
A schematic of the circuit is to be provided with each entry.
A zero-to-24v variable power supply, 40M band-pass filter, dummy load and power meter will be supplied by the judges.
The competition will have two rounds of trials to demonstrate power output of each circuit, with the best performance of each circuit being its final score. During each test, the builder will connect his circuit, set the power supply voltage and then announce to the judges when to begin measurement. During a period of one minute in which the builder may not touch the circuit or power supply, the RF power output at the end of one minute will be taken as the score for that trial. Failure of the circuit in that one minute test period results in a score of ZERO for that round!
The winner is the circuit generating the highest power score during either of his two rounds.
If the circuit fails during the first test period, the builder will have five minutes in which to repair it before the second round trials.
If your entry sets off the smoke detector in the Holiday Inn, you will be disqualified and may be subjected to rude laughter and finger pointing during the rest of FDIM!