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In order to receive the Grimeton SAQ transmissions I am using the Flex-1500 together an active whip antenna and the VLF-LF-MF band up-converter from Heros technology.
Occasionally I use too my old Trio TS-830S working in parallel with the Flex radio for so the IF output of the VLF converter is derived to the antenna input of booth radios by means of a signal splitter device. The system works fine on all the VLF to MF spectrum covered by the converter.
73 de M0WWA