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| To: | rsgb_lf_group@blacksheep.org |
|---|---|
| Subject: | Re: VLF: Long time transmission on earth antenna |
| From: | Stefan Schäfer <Stefan.Schaefer@iup.uni-heidelberg.de> |
| Date: | Fri, 19 Nov 2010 10:14:43 +0100 |
| Cc: | Paul <paul@abelian.netcom.co.uk>, Bernd Grupe <bernd.grupe@t-online.de> |
| In-reply-to: | <4B7D642B16CE4B7A8FE8BEED6EF025B8@ns94d01ae4d850> |
| References: | <4CD861D8.3070904@iup.uni-heidelberg.de><4CD920EB.4070707@mvnet.de><4CE28C13.3080200@iup.uni-heidelberg.de><8CD53CE511474E6-848-EAE@webmail-d027.sysops.aol.com><4CE2E571.6030500@iup.uni-heidelberg.de><4CE3BC5A.4070408@o2.ie><4CE4F91C.9070709@iup.uni-heidelberg.de><739785511.4774764.1290079833746.JavaMail.fmail@mwmweb080> <AANLkTin8RBiPezJuVdEo09Cb8+EYy6JxDXDSpUfgHfs3@mail.gmail.com> <4B7D642B16CE4B7A8FE8BEED6EF025B8@ns94d01ae4d850> |
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Dear VLF,It seems these batteries are not in best condition. The carrier got weaker and weaker in the morning and disappeared arround 5 UTC. The SMPS that drives the PA is designed to generate its own 15 V supply once it started to run. But if the input voltage falls below 10V (or 9) it shuts down. Seems that this has happend... The batteries have > 300 Ah in sum so it should have been no problem, actually... I assume no one except me has detected anything? BTW: The starting time was 15:30 UTC so the DFCW shift appeared at 23:30 UTC 73, Stefan/DK7FC |
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