http://marconiincommunications.pbwor...Communications
I don’t think that the site “Marconi in Communications” had been flagged previously.
It contains quite a bit of information – typically catalogue entries - about Marconi receivers and other products.
Also, the American Radio History.com site (
https://www.americanradiohistory.com/) now has one or two issue of the journal “Electronic Engineering” In particular it has the 1954 June issue (
https://www.americanradiohistory.com...aster_Page.htm) that was dedicated to HF communications. Amongst the several and varied articles is one by a Marconi staffer,
“New Developments in HF Receivers”, p.241ff. This used some Marconi receivers as worked examples.
Cheers,