[time-nuts] Z3816a

[Robert Benward]

Bob,
I agree, I suspect the E1938 he was examining may have been a lemon of the lot.  He did not indicate this was across the 
board.  I am under the impression the claim to fame of the E1938 is the ultra stable double oven.

Bob


----- Original Message ----- 
From: "Bob Camp" <lists at rtty.us>
To: "Discussion of precise time and frequency measurement" <time-nuts at febo.com>
Sent: Saturday, June 05, 2010 11:39 PM
Subject: Re: [time-nuts] Z3816a


> Hi
>
> The 1938 and 10811 share the same basic crystal. The difference between a "very good" and a "acceptable" crystal can 
> be an order of magnitude or more on ADEV at tau >= 1 second. In a very stable environment the rare 10811 with the 
> 5x10^-13 at 1 second crystal will beat most of the production 10811's or 1938's. It's sort of luck of the draw in that 
> respect.
>
> Bob
>
> On Jun 5, 2010, at 11:31 PM, Robert Benward wrote:
>
>> 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?
>>> _______________________________________________
>>> time-nuts mailing list -- time-nuts at febo.com
>>> To unsubscribe, go to
>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>>> and follow the instructions there.
>>>
>>>
>>> _______________________________________________
>>> time-nuts mailing list -- time-nuts at febo.com
>>> To unsubscribe, go to
>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>>> and follow the instructions there.
>>>
>>>
>>> _______________________________________________
>>> time-nuts mailing list -- time-nuts at febo.com
>>> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>>> and follow the instructions there.
>>
>>
>> _______________________________________________
>> time-nuts mailing list -- time-nuts at febo.com
>> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>> and follow the instructions there.
>>
>
>
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.