630M band (472kHz-479kHz) Transverter. Under development

The 630M band offers some real technical challenges with such a long wavelength coupled with very restrictive ERP (Effective Radiated Power) limits, it is never the less a band worthy of exploration. In Australia and this is not the case in some other country's the licence conditions permit the use of any mode with a maximum bandwidth of 2.1 kHz. While most communication within this band is CW or one of the many narrow band digital modes there is the tantalizing option of SSB voice contacts and it is with this view that the transverter design is for linear conversion allowing for all possible modes that fit within the 2.1kHz bandwidth to be utilised.

The design for the 630 metre band transverter is based on using the 30 metre amateur band as the transmit and receive IF as some modern commercial amateur radio HF transceivers including my TS930 the coverage of this band for both transmit and receive is from 10.0MHz  to 10.5MHz. This allows the transverter to mix a 10.0MHz local oscillator with the transceiver tuned to 10.472MHz giving an out or input at 0.472MHz or 472kHz. 

The five key sections of the transverter, the 10MHz Local oscillator, the Receive Converter, the Transmit Converter, final common low pass filter and the Transverter Switching circuit have been constructed on five separate boards with the view that each of the individual sections can be upgraded with improved future designs.   

Fig 1 Block diagram for the 630M band (472kHz-479kHz) Transverter. This is subject to further development.

Photo 1 Front top view of the assembled 630M band (472kHz-479kHz) Transverter.

Photo 2 Rear top view of the assembled 630M band (472kHz-479kHz) Transverter.

Photo 3 Top view of the assembled 630M band (472kHz-479kHz) Transverter.

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Page last revised 05 May, 2025