[time-nuts] Z3816a

Robert Benward rbenward at verizon.net
Sat Jun 5 23:31:38 EDT 2010


Joe,
Thank you for your inputs!  The Z3815A I suspect is low voltage, 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



----- Original Message ----- 
From: "J. L. Trantham" <jltran at att.net>
To: "'Discussion of precise time and frequency measurement'" <time-nuts at 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-bounces at febo.com [mailto:time-nuts-bounces at 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-bounces at febo.com [mailto:time-nuts-bounces at 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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