[GPS_Standard] GPS_Standard Digest, Vol 28, Issue 1

Thu Apr 2 10:41:42 EDT 2009

I forgot to mention that (in the beginning) also ) is displayed. But I think 
that for values smaller than ..e-12 something strange happens for I suppose 
that you are not using so many bits in the calculation.
73
Arie

----- Original Message ----- 
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To: <gps_standard at mailman.qth.net>
Sent: Wednesday, April 01, 2009 6:00 PM
Subject: GPS_Standard Digest, Vol 28, Issue 1

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> Today's Topics:
>
>   1. Re: Power supply for stand alone GPS time base (Roberto Barrios)
>   2. exponents (Arie Dogterom)
>   3. exponents (Arie Dogterom)
>   4. Re: exponents (Bert, VE2ZAZ)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Tue, 31 Mar 2009 17:56:46 +0000
> From: Roberto Barrios <rbarrioss at msn.com>
> Subject: Re: [GPS_Standard] Power supply for stand alone GPS time base
> To: <gps_standard at mailman.qth.net>
> Message-ID: <BAY144-W32616A19D13C11FEF472C4B28A0 at phx.gbl>
> Content-Type: text/plain; charset="iso-8859-1"
>
>
> Hi Feyssac,
>
>
>
> I'm working on something similar, but simpler than yours.
>
>
>
> Don't you have pictures to share with us ? :-)
>
>
>
> Regards,
>
> Roberto, EB4EQA
>
>
>
>> Date: Mon, 30 Mar 2009 18:57:09 +0200
>> From: "Feyssac jacques" <feyssacj at wanadoo.fr>
>> Subject: [GPS_Standard] Power supply for stand alone GPS time base
>> To: <gps_standard at mailman.qth.net>
>> Message-ID: <012901c9b158$906f9540$0c01a8c0 at perso1c5f52446>
>> Content-Type: text/plain; charset="iso-8859-1"
>>
>> Hello All !
>> On this side of the pond we took the following schematic:
>> Main power supply : 28,5 volts SMPS 2,5 Amps powering the general BUS
>> 1? Linear Fet regulator 27,6 volts 200mA feeding two 12 volts sealed 
>> batteries in serial
>> 2? SMPS regulator delivering 21 volts to rubidium time base
>> 3? SMPS regulator delivering 6 volts to three low drop 5 volts linear 
>> regulators for powering :
>> - The VE2ZAZ control board
>> - The 10 mHz isolation/buffer/linear amplifiers powered only when a BNC 
>> is connected (to reduce permanent
>> power consumption
>> - The NMEA display
>> A diode switch will connect the battery suply to the bus in case of main 
>> failure, so there is no lost of synchro
>> We try by every ways to reduce the power consumption as the equipment is 
>> working permanently.
>> Final result is excellent without any spurious modulation to the 10 mhz 
>> signal
>> 73 to all
>> Feyssac jacques
>
>
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> ------------------------------
>
> Message: 2
> Date: Tue, 31 Mar 2009 21:40:09 +0200
> From: "Arie Dogterom" <pa0ez at amsat.org>
> Subject: [GPS_Standard] exponents
> To: <gps_standard at mailman.qth.net>
> Message-ID: <753974A6487C4CE495E0E890B9167ED1 at Pavilion>
> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
> reply-type=original
>
> Dr All,
> I have installed the latest version of the monitor prgramme. But the 
> strange
> results are not different from before. In fact the only exponents ever
> visble are e-8 e-9 e-10 e-11 e-12 e-25 and e-26. A few minutes before I
> write this the overall average ( over about 2000 sample periods) jumps
> betwee ..e-12 and ..e-25. Where are the other exponents?
> 73
> Arie
>
>
>
> ------------------------------
>
> Message: 3
> Date: Tue, 31 Mar 2009 21:37:40 +0200
> From: "Arie Dogterom" <pa0ez at hccnet.nl>
> Subject: [GPS_Standard] exponents
> To: <gps_standard at mailman.qth.net>
> Message-ID: <2CBA457AF9E6427F8EBC279236C12379 at Pavilion>
> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
> reply-type=original
>
> Dr All,
> I have installed the latest version of the monitor prgramme. But the 
> strange
> results are not different from before. In fact the only exponents ever
> visble are e-8 e-9 e-10 e-11 e-12 e-25 and e-26. A few minutes before I
> write this the overall average ( over about 2000 sample periods) jumps
> betwee ..e-12 and ..e-25. Where are the other exponents?
> 73
> Arie
>
>
>
> ------------------------------
>
> Message: 4
> Date: Wed, 1 Apr 2009 07:28:29 -0400
> From: "Bert, VE2ZAZ" <ve2zaz at sympatico.ca>
> Subject: Re: [GPS_Standard] exponents
> To: "Arie Dogterom" <pa0ez at amsat.org>, <gps_standard at mailman.qth.net>
> Message-ID: <BLU0-SMTP166A5B3A9FE26C1C157B3BF18B0 at phx.gbl>
> Content-Type: text/plain; charset="Windows-1252"
>
> Hello Arie,
>
> Thanks for providing feedback. You will probably not see anything higher
> than 10e-8 simply because your system does not jump much around the 26624
> nominal value when it is warmed up and stable. Try it again when the OCXO 
> is
> cold and you should see a much higher value.
>
> As for the smaller values between 10e-12 and 10e-25, I have not noticed 
> this
> behavior. I just launched a GPS_Montrol session and will keep an eye on it
> in the next few days. I am quite convinced though that the averaging
> formulas work well. Maybe it is just how Delphi (object-oriented Pascal)
> displays the result. Maybe it's because the result is essentially zero, 
> but
> it is not displayed as such. Remember that this is a calculation of
> thousands of points and it will trend towards zero. Maybe there is some
> round up performed by Delphi. In any case, I would say that when you reach
> such small 10e-12 error, that the exact value becomes meaningless and that
> you are right on target.
>
> Best Regards,
>
> Bert, VE2ZAZ
>
> ----- Original Message -----
> From: "Arie Dogterom" <pa0ez at amsat.org>
> To: <gps_standard at mailman.qth.net>
> Sent: Tuesday, March 31, 2009 3:40 PM
> Subject: [GPS_Standard] exponents
>
>
> Dr All,
> I have installed the latest version of the monitor prgramme. But the 
> strange
> results are not different from before. In fact the only exponents ever
> visble are e-8 e-9 e-10 e-11 e-12 e-25 and e-26. A few minutes before I
> write this the overall average ( over about 2000 sample periods) jumps
> betwee ..e-12 and ..e-25. Where are the other exponents?
> 73
> Arie
>
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> End of GPS_Standard Digest, Vol 28, Issue 1
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