[time-nuts] EES RC 1454 & 100DB MSF/GPS clock
GandalfG8 at aol.com
GandalfG8 at aol.com
Thu Nov 29 19:45:59 UTC 2012
Hi Robert
For some reason I missed these until you mentioned them but have just taken
a look and am reminded very much of the similarly modified and boxed EES
100s that Connect Distribution were selling around 5 years ago.
Whilst this looks to be a much later unit both EES and Radiocode clocks do
seem to have survived for an awful long time without too many significant
revisions to their hardware, internal hardware anyway:-)
I've seen a similar connector on one version of the RC060s but even that
mainly used conventional D connectors.
>From what I remember of the antenna modules on the EES 100s I got the
impression that the interface processor board extracted the timing information
from the GPS signal and converted it into an MSF compatible signal to feed
the EES 100. I'm sure they didn't frequency convert from L band to 60KHz but
just took the GPS data and started from fresh to generate their own MSF
compatible signal using that data.
I never tried to use one of the modified units straight from MSF but will
dig one out and try it, I don't think there was very much of a modification
to the MSF receiver other than whatever was required to accept another
60KHz signal.
I suspect all the hard work was done in the antenna module and the MSF
unit was just used as decoder and display for the converted signal.
I may have missed something, nothing unusual there then:-), but it always
struck me as a rather odd way of accessing and displaying GPS timing data,
unless initially there was some pressure to find a quick fix utilising
existing approved equipment.
Regards
Nigel
GM8PZR
In a message dated 29/11/2012 18:58:47 GMT Standard Time,
robert8rpi at yahoo.co.uk writes:
Hi all,
I recently gave in and bought one of the EES (european electronic systems)
RC1454 Radio Clock units that have been on ebay.co.uk for a while. The one
I snagged came with a GPS antenna unit. The main unit has a label saying
"GPS Modified" The main box appears to be a MSF receiver but has no obvious
power connector, just two rectangular multiway sockets, a 15W D plug and
two BNC's. It is a 2U high card frame with 15 PCBS and a LED display on th
front. Vintage is late 1990's and both units look like new. The GPS unit has
an early Oncore (R1211A) receiver and a PCB with a CPU etc. Two BNC' marked
"MSF ANT" and RX looks like a mod for either MSF or GPS time. Does anyone
have any information on these beore I get into major reverse engineering?
Robert G8RPI.
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