Robert Benward wrote:
Joe,
Thank you for your inputs! The Z3815A I suspect is low voltage
If and only if a ~24-48V supply is considered low voltage.
The 10MHz outputs level is only around +4dBm though there are 4 10MHz
outputs.
, it has a large PC card/motherboard type of connector with a large
molex/amphenol power connector. There appears to be a pair of DC-DC
modules inside. You would need to make some internal taps to get the
10MHz out to a BNC. I also read somewhere an author's disappointment
on the performance of the (his?) E1938A compare to the 10811. I have
one that is stand alone, running continuously.
I was under the impression that the maximum number of satellites in
view is about 12 (24 active in a constellation hemisphere view), the
other channels I think are used for WAAS and other data channels.
Bob
Bruce
----- Original Message ----- From: "J. L. Trantham" <jlt...@att.net>
To: "'Discussion of precise time and frequency measurement'"
<time-nuts@febo.com>
Sent: Friday, June 04, 2010 10:56 PM
Subject: Re: [time-nuts] Z3816a
Correction. Z3805A tracks 16 satellites.
Joe
-----Original Message-----
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of J. L. Trantham
Sent: Friday, June 04, 2010 9:51 PM
To: 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] Z3816a
I have Z3816A's and TBolt's. Both do a great job. For the TBolt, I use
TBoltMon.exe to monitor and for the Z3816A, I use SatStat. The Z3816A
requires a 'null modem' adapter or an appropriately wired serial
cable to
connect to the serial port of the computer where as the TBolt uses a
straight serial cable.
The only potential advantage of the Z3815A that I know of is the fact
that
it uses the E1938A oscillator. I have a couple of these oscillators and
they are superior in performance. However, I have no firsthand
knowledge of
performance of the Z3816A versus the Z3815A.
The Z3816A and the TBolt tracks up to 8 satellites. The Z3816A also
tells
you what other satellites are under consideration but are not being
tracked,
perhaps up to 8 other non-used satellites. I have at most seen the
Z3816A
refer to a total of 11 satellites (8 tracked and 3 not tracked) but my
antenna is not in an ideal location. I do not know about the
Z3815A. The
Z3805A tracks up to 12 satellites, if I recall correctly, and probably
should also be included in the comparison list if you are looking for a
GPSDO.
The Z3816A comes in at least two variants, one powered by a DC supply
(I use
30 VDC for mine) and the other powered by 120 VAC. I don't know
about the
Z3815A.
Good luck,
Joe
-----Original Message-----
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Robert Benward
Sent: Friday, June 04, 2010 7:13 PM
To: time-nuts
Subject: [time-nuts] Z3816a
Hi All,
Is there any downside to a model Z3816A? I also see a Z3815A on
Ebay, but
the connector arrangement is not attractive. Does anyone have a link
to a
comparison chart between all these models?
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