See QRZ for additional M0GEB Info

Class B licence G8CRU 1969 - Class A licence M0GEB 2001 - RSGB, RSARS #3914 and RAOTA #1717

Current interests are HF and RF engineering theory and technique

Rigs Icom 7300, Yaesu FT890, Drake TR7, Racal RA1772 HF receiver.

Antenna own design ocf HF zepp type dipole and 6m&4m two element beam

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The files below refer to RF Modulator techniques which are described in full in the patent GB2558296B.pdf.

The patent is no longer in force as of 2026 and all the techniques in the description are public domain.

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Essentially the techniques are methods for generating QAM and particularly SSB with ideally 100% DC to RF conversion efficiency.

The patent also covered the use of a compatible harmonic reduction technique.

Several techniques are covered in the description though the patent claims of neccesity only covered one.

The technique using two independent phase modulated constant amplitude carriers is particularly attractive for DSP implementation.

The WAV files are stereo sound card files that example this two phase technique.

The Left and Right sound card outputs are taken differntially to produce a 13kHz carrier either USB, LSB or ISB (two independent sidebands).

I fed the two sound card outputs to an audio transformer (floating primary) and applied the secondary (being the differential combination) to a 13kHz receiver to demodulate the USB/LSB/ISB as appriopriate.

The chosen WAV file is conveniently played as a loop on the PC.

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RF Modulator Patent GB2558296B.pdf