Shortwave Radiogram. 9-16 July 2026 (program 457): Digital modes that can be transmitted via old analog landline telephones

Thanks to Tony Pavick and Al Holt for producing the very interesting programs 455 and 456 of Shortwave Radiogram. And to Marty Pittinger for watching over the Bluesky and X accounts, with reminder posts and reposts. Yesterday (July 8) I emailed some decoding results of Tony's show (455), featuring logos and test patterns of the Canadian Broadcasting Corporation and Radio Canada International. That…