[time-nuts] UK standard frequencies - where?
David J Taylor
david-taylor at blueyonder.co.uk
Thu Oct 13 10:05:29 UTC 2011
> Hi David,
> I found it possible to compare down to the mHz region for the 1kHz
> tones, but of course it requires good propagation, hanging around for
> the continuous carrier periods of RWM and a disproportionate level of
Patience is something I need more of! But in terms of the R8500, I found
that adjusting the trimmer to as near as 1 Hz at 15 MHz was quite tricky.
> A GPSDO is certainly the way to go for a quick, reliable and highly
> accurate frequency reference - and it's a godsend if you have test gear
> with a reference input. In fact a pal of mine has recently bought a
> TS950 transceiver which already has an input for a 10MHz reference -
> sadly my IC756Pro2 doesn't have that but at least I can check it
Yes, that would be handy. Except that you'll then start wanting to take
your reference when going out portable!
> You'll probably find, like me, that once you have cracked the issue of
> frequency accuracy you'll start fretting about amplitude accuracy when
> you test and align things!
> All the best,
> David, G4IRQ
Yes, I can imagine, but that will have to wait! I was sorely tempted by
the spectrum analyser & tracking generator reviewed in the recent RadCom,
but I don't think I would use it enough, let alone justify the cost.
> PS. When locating the GPS aerial, if possible try and get a clear view
> from W, through South and around to East. That arc is where you'll see
> the most satellites; from NW through North to NE has poor coverage.
Yes, I have four GPS antennas for timekeeping here already, one outside (a
Garmin GPS 18 LVC on the roof, sloping towards the west) and three
indoor - two Sure and one GPS 18x LVC. In my WXtrack software, I wrote a
function which shows the number of satellites visible in a particular
quadrant during the day. I also wrote a program which read the messages
coming a GPS 12XL I have and plotted the actual satellites seen at this
SatSignal software - quality software written to your requirements
Email: david-taylor at blueyonder.co.uk
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