Differences

This shows you the differences between two versions of the page.

--- vlf [2023/12/23 10:03] – [Setup and Testing] ei3jdb
+++ vlf [2023/12/23 12:01] (current) – [Setup and Testing] ei3jdb
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 Although there are no ham bands for VLF, there are VLF transmissions that hams can receive.  This page is about how to receive the transmissions from the Alexanderson transmitter at Grimeton in Sweden, sent on Alexanderson Day (2nd July) and Christmas Eve (24 December) every year.
+===SAQ Grimeton===
 The Grimeton transmitter is the last surviving example of an Alexanderson transmitter, generating 200kW of RF at 17.2kHz using a direct alternator: a slotted magnetic disc that weighs more than a family car spinning at over 2000RPM.
 The transmitting station is now a [[https://grimeton.org/en/|museum]] and the transmissions are arranged by the [[https://alexander.n.se/en/|Alexanderson Association]]
+===Soundcard SDR===
+The receiver described here is a computer soundcard and GNURadio Companion combined to make a VLF Software Defined Radio.  Since the frequencies are very low they are within the range of high fidelity audio equipment -- so a soundcard can capture the radio frequency.  Yes, you really plug an antenna into your soundcard!
 ====Hardware====
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 ===Windows Setup===
-//Please someone with a Windows computer put something here!//
+To find your soundcard in Windows please follow [[https://wiki.gnuradio.org/index.php/Audio_Source#Windows|these instructions]]
 ===QSL?===
 If you heard the transmission, the Alexanderson Association have an online QSL form for your signal report on their [[https://alexander.n.se/en/|home page]].