To: | [email protected] |
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Subject: | LF: W4DEX at 8540 Hz in Todmorden |
From: | Paul Nicholson <[email protected]> |
Date: | Sat, 2 Dec 2017 13:03:26 +0000 |
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Dex surprised me last night with a carrier on 8540 Hz, GPS-locked and the ERP would be circa 100uW. Tx was stable from 21:25, detectable in the UK by 22:30, and a good overnight signal until 03:00 when Dex planned to switch off. http://abelian.org/vlf/tmp/171202a.gif Signal about 0.1fT and 30nV/m, about 30 electrons worth of charge on the new E-field antenna. Anything with double figures is a good amateur signal! H-field: -27.7 dB in 1Hz, phase -109.4 deg; E-field: -26.0 dB in 1Hz, phase -108.1 deg; It's not unusual for the new E-field rx to do better than the loop rx. Looks like I need to hurry up with the upgrade to the H rx! I've cleared bench space for the replacement and parts are on order. I measured the bearing using three different methods: Watson-Watt goniometry: 273.1 deg Poynting vector: 287.5 deg Tsuruda/Hayashi NPE: 282.3 deg The great circle bearing is actually 284.6 deg. NPE should be the most accurate method - no polarisation error but relies on precise relative phase measurements between the three channels. -- Paul Nicholson -- |
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