John Ackermann N8UR wrote:
Does anyone on the list have any specs or manuals for the Spectracom
8140 distribution amplifiers? While I'd like schematics, I'm
particularly interested in how many of them you can put in a single chain.
For those who aren't familiar, these are part of a frequency
Loran can do great frequency measurement -- almost as good as GPS. But
for timing, it's not so hot. The problem with current Loran is that it
doesn't carry a timecode, or mark the second epoch. It's possible to
recover 1pps from Loran with a bit of work (the Austron 2100T receiver
can
Anyway, I'm just wondering how many of these amps I can string together;
right now I have 8 and it seems to work OK but I'm not sure if I'm
stretching things.
Forget the spec, whatever it is. How about actually
measuring what happens to the quality of the signal
when you add the N+1st tap?
Hi John:
eBay auction 7605840019 says up to 25 boxes on the master coax. But I
suspect it's a function of the power supply in the main box.
73,
Brooke Clarke
--
w/Java http://www.PRC68.com
w/o Java http://www.pacificsites.com/~brooke/PRC68COM.shtml
http://www.precisionclock.com
John
Tom Van Baak said the following on 04/22/2006 01:47 PM:
Forget the spec, whatever it is. How about actually
measuring what happens to the quality of the signal
when you add the N+1st tap? Were these taps meant
for precision work? And is that quartz precision (1e-9)
or cesium precision
Brooke Clarke said the following on 04/22/2006 01:51 PM:
Hi John:
eBay auction 7605840019 says up to 25 boxes on the master coax. But I
suspect it's a function of the power supply in the main box.
73,
Brooke Clarke
Ah, thanks. I did some power measurements at one point but didn't
Bill Janssen said the following on 04/22/2006 01:33 PM:
You might try spectracom for info on that distribution amplifier. I
included a URL that you can try.
I didn't read the info so you may have to contact Spectracom for
additional info.
I received the note below from Ernie Peres in Germany which reports an effect
consistent with an occasional phase jump in the 1 PPS output from a M12+ rcvr,
perhaps related to DGPS corrections. The DGPS sats Ernie sees from his
location are part of the EGNOS system.
The DGPS sats visible to
