This is a site for those interested in building their own HF amateur radio station equipment.

The site documents my current station consisting of the 2020 HF Transceiver and MRF101 amplifier. Detailed information is also included for the Express Receiver, and some limited information for the Express Transmitter and 6146B amplifier. I don’t own a commercial rig and operate exclusively digital modes, mainly FT8. I find FT8 to be a fascinating mode in terms of exploring propagation, antenna performance, and receiver performance. As of November 2021, I have 149 / 143 countries worked / confirmed with a 43-Ft vertical.

The Express Receiver was designed and built between 2014 and 2016, and the Express Transmitter between 2017 and 2018. As such, some of the parts I used may no longer be available, however, for most there will be substitutes.

November 15, 2021 Update. The 2020 HF Transceiver was used on the air for the first time on October 30, 2021, and has since been used on all bands. From start to finish, the build took approximately 15 months. During the course of the New Hampshire winter, I will add build information for the complete transceiver.

The 2020 Transceiver started out in 2020 as a concept with the following objectives in mind:

  • Build a highly integrated transceiver
  • Learn KiCad to take advantage of low cost PCB manufacturers in Asia
  • Maintain the building block approach of the Express Receiver / Transmitter
  • Utilize H-Mode Mixers and a Quadrature Sampling Detector (QSD / Tayloe Detector)

The only objective not met was the use of H-Mode Mixers. I decided to use Analog Devices AD831 monolithic mixers in the 1st and 2nd mixers stages as I was very pleased with the performance of the Express Receiver and it was the fastest route to getting the transceiver on the the air. The modular nature of the transceiver will allow later upgrade to H-Mode Mixers by simply changing out the 1st Mixer, 2nd Mixer, Roofing Filter, & Post Mixer Amp Board.

Thanks for visiting.

Rod, AD5GH

Windham, New Hampshire

November 2021

One thought on “HOME

  1. Jean Pierre Mallet March 10, 2021 / 11:56 am

    Fine Business 73 F5MI


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