[time-nuts] HBG swiss time transmitter shutdown
alan.melia at btinternet.com
Thu Oct 13 11:17:18 UTC 2011
I believe the majority of the microwave beacons (1000MHz and above) in the
UK are now GPS locked for the output frequency. Most are able to maintain
accuracy to a few Hz at the working frequency. Time information is
obviously available at the site, but this is of less interest......to radio
----- Original Message -----
From: "Dan Mills" <dmills at exponent.myzen.co.uk>
To: <time-nuts at febo.com>
Sent: Thursday, October 13, 2011 1:42 AM
Subject: Re: [time-nuts] HBG swiss time transmitter shutdown
> On Thu, 2011-10-13 at 02:11 +0200, Magnus Danielson wrote:
> > I have wondered if not amateurs could set up small frequency broadcasts
> > of their own. Say a 10 W transmitter or something.
> It's called a beacon and at least the UK license does allow them (25W
> maximum) and there are a great many out there (mostly used for
> propagation studies and the like).
> Transmitter frequency stability will vary all over the shop, from non
> ovenised microprocessor grade quartz, all the way up to GPS/Rb
> disciplined Wenzel sprinter OCXO.
> I don't know of any carrying time standard transmissions, but that does
> not mean they do not exist.
> To be of real use however a time standard transmission needs to be
> reliably receivable over a wide area, with known accuracy and that is
> not easy. Having a standard as the carrier generator for a longwave
> station was ideal as it added little to nothing to the cost of running a
> very high power transmitter, and made the carrier useful instead of just
> being a waste of power.
> Regards, Dan.
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