Two rules to follow. 1 - use well shielded cables for the 10 MHz
distribution
if you wish to receive WWV 10 off the air. The skinny cables used for
Ethernet
generally don't cut it.
2. Most instruments have a high impedance 10 MHz input. Put them in
the middle
with T connectors left over from your 10 base T days. If you have an
instrument
that terminates the 10 MHz input, it goes last. Otherwise use a
terminator at the
end.
I have an Advantest spectrum analyzer, HP selective level meter,
Racal-Dana counter,
Flexradio 1500, and Gigatronics generator daisy chained from a
Thunderbolt. Plenty
of signal, and the fat (well shielded) cables let me listen to WWV.
On 11/29/2012 07:01 AM, Tom Clifton wrote:
Good heavens, no. By doing so, they both have the same reference and the
measuremets actually means something. I have a stack of HP stuff (3586, 3386
and assorted counters) all T'd off my Tbolt without issue. The only caveat is
that you don't put too much stuff across the T-bolt output so as to load it
down to the point where some device can't get clocking. Before you hit that
point, you may need a high quality (low jitter) distribution amp in the timing
chain.
________________________________
Date: Thu, 29 Nov 2012 09:42:39 +0000
From: Chris Wilson
Subject: [time-nuts] Frequency generator and counter on same external
reference?
I am repairing an 18GHz counter and it has a 10MHz external reference port.
So does my elderly Marconi 2019A sig gen. Is there any potential issue having
them both referenced off my Thunderbolt GPS referenced standard, at the same
time?
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--
Chuck Forsberg WA7KGX N2469R c...@omen.com www.omen.com
Developer of Industrial ZMODEM(Tm) for Embedded Applications
Omen Technology Inc "The High Reliability Software"
10255 NW Old Cornelius Pass Portland OR 97231 503-614-0430
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