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| To: | <[email protected]> |
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| Subject: | Re: LF: Poor antennas |
| From: | "James Moritz" <[email protected]> |
| Date: | Tue, 2 Aug 2011 22:16:08 +0100 |
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----- Original Message ----- From: "Jacek Lipkowski" <[email protected]> BTW it is incredible that nowadays people in north america are using sophisticated receive setups with FFT to barely receive SAQ, and just 90 years ago they used crude receivers for a 24h/7 telecomunications service between the continents without problems. Dear Jacek , LF Group,Well, perhaps it is not as simple as that. At http://earlyradiohistory.us/1922RCA.htm you can see a photo of some of the receivers used (fig 180 at the bottom of the page), with a rather brief description. Considering this was the early 1920s, the receivers were clearly rather complex, with many features added to attempt to reduce noise problems. They used full-wavelength Beverage antennas at remote locations, also to reduce noise. From reading this and other accounts, it is clear that, although undoubtedly there was much less man-made QRM than today, noise was always a serious limiting factor for VLF/ LF communications. Cheers, Jim Moritz73 de M0BMU |
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