[time-nuts] Rapco 1804m
gandalfg8 at aol.com
gandalfg8 at aol.com
Sun Jun 3 20:41:56 UTC 2012
I have several of these, all work well, all take some time to settle down after the control LED comes up. I can't remember now if any of mine have shown fine either but have compared all with a trio of Thundebolts and all work well as I say.
There's a manual for the Rb version available from at least two of the UK Ebay suppliers so worth asking if you bought from there. All you need is in the manual and the Rb command set is very similar to the OCXO version but I can let you have a pdf copy of the proper OCXO version manual next week if you don't get one before then.
I'm away from home right now and internet is very hit and miss here but will be back Wednesday.
regards
Nigel
GM8PZR
Hi
Just joined the list - recently acquired a Rapco 1804m, mainly to use as
a frequency standard, especially to have something to check the FE-5680A
that I have.
The unit itself seems to work OK - connected to a cheapie puck style GPS
antenna I got a 2D fix, occasionally 3D which corresponded pretty well
with my actual location and "Coarse" oscillator lock, but never "Fine".
It's the version with an OXCO rather than local Rubidium oscillator.
I've read David Taylor's notes and had a hunt through the list archives
- I suspect I need a slightly better antenna, or a better position for
the one I already have. It had a decent enough view southwards/southwest
but somewhat obstructed to the north and north-east and comparing the
visible satellites on my 'phone it was certainly the
northerly/north-eastern ones that had low or no signal strength.
However I could really do with a copy of the manual, at least to
understand the difference between "Coarse" and "Fine" locks on the
oscillator - does anyone have an electronic copy that they would be
willing to let me have? Or a physical copy - I'm happy to pay a
reasonable sum.
Also is the serial protocol for these documented anywhere?
-----Original Message-----
From: Paul Flinders <paul at flinders.org>
To: time-nuts <time-nuts at febo.com>
Sent: Sun, 3 Jun 2012 11:16
Subject: [time-nuts] Rapco 1804m
Hi
Just joined the list - recently acquired a Rapco 1804m, mainly to use as
a frequency standard, especially to have something to check the FE-5680A
that I have.
The unit itself seems to work OK - connected to a cheapie puck style GPS
antenna I got a 2D fix, occasionally 3D which corresponded pretty well
with my actual location and "Coarse" oscillator lock, but never "Fine".
It's the version with an OXCO rather than local Rubidium oscillator.
I've read David Taylor's notes and had a hunt through the list archives
- I suspect I need a slightly better antenna, or a better position for
the one I already have. It had a decent enough view southwards/southwest
but somewhat obstructed to the north and north-east and comparing the
visible satellites on my 'phone it was certainly the
northerly/north-eastern ones that had low or no signal strength.
However I could really do with a copy of the manual, at least to
understand the difference between "Coarse" and "Fine" locks on the
oscillator - does anyone have an electronic copy that they would be
willing to let me have? Or a physical copy - I'm happy to pay a
reasonable sum.
Also is the serial protocol for these documented anywhere?
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