Hello Bruce,
I agree. The DAC reference is an LM7805CT regulator with 0.8mV/C (typ.)
temperature coefficient. Considering that typical Oscillators (MTI units for
example) have about +-20Hz deviation per 5V - this alone - excluding the
Opamps
tempco, would lead to a temperature drift
: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Im Auftrag von [EMAIL PROTECTED]
Gesendet: Samstag, 21. Oktober 2006 08:30
An: time-nuts@febo.com
Betreff: Re: [time-nuts] The VE2ZAZ GPSDO
Hello Bruce,
I agree. The DAC reference is an LM7805CT regulator with
0.8mV/C (typ
: [time-nuts] The VE2ZAZ GPSDO
Dave Brown wrote:
Interested in any comments on this GPSDO -
http://www3.sympatico.ca/b.zauhar/GPS_Std/GPS_Std.htm#GPS_Receivers
DaveB, NZ
Why anyone would bother to create something like this escapes me.
Just another example of unintelligent engineering
@febo.com
Subject: Re: [time-nuts] The VE2ZAZ GPSDO
Hello Bruce,
I agree. The DAC reference is an LM7805CT regulator with 0.8mV/C (typ.)
temperature coefficient. Considering that typical Oscillators (MTI
units for
example) have about +-20Hz deviation per 5V - this alone - excluding
the Opamps
.
Regards
DaveB, NZ
- Original Message -
From: Randy Warner [EMAIL PROTECTED]
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Sunday, October 22, 2006 9:35 AM
Subject: Re: [time-nuts] The VE2ZAZ GPSDO
Said et al,
Although everything said
I think it'd be great to see Dr. Griffiths' list of issues in a letter to
QEX, sans a couple of the more, er, editorial comments. This would give
the author a chance to respond, and alert other builders of opportunities
for improvement.
Some of the concerns may not be major issues (e.g., it
: [time-nuts] The VE2ZAZ GPSDO
I think it'd be great to see Dr. Griffiths' list of issues in a letter
to QEX, sans a couple of the more, er, editorial comments. This would
give the author a chance to respond, and alert other builders of
opportunities for improvement.
Some of the concerns may
John Miles wrote:
I think it'd be great to see Dr. Griffiths' list of issues in a letter to
QEX, sans a couple of the more, er, editorial comments. This would give
the author a chance to respond, and alert other builders of opportunities
for improvement.
Some of the concerns may not be
In message [EMAIL PROTECTED],
Randy Warner writes:
Said et al,
Although everything said in this thread is accurate, I guess I find
myself a little reluctant to just trash the author and the project out
of hand. He is obviously a hobbyist without a lot of precision timing
theory in his back
John Miles [EMAIL PROTECTED] wrote:
Some of the concerns may not be major issues (e.g., it seems safe to say
that the FLL action will correct for drift caused by the 7805's tempco,
unless you plan to dump a can of R134a on it), but others are worth bringing
to the magazine's attention. If
[EMAIL PROTECTED] (Tim Shoppa) wrote:
Having seen some bad vibes unfold through the channels of the
letters column and other communications with editors, I think that
BY FAR the most useful thing to do would be to contribute an
improvement (preferably with schematic) rather than a lengthy
Tim Shoppa wrote:
John Miles [EMAIL PROTECTED] wrote:
Some of the concerns may not be major issues (e.g., it seems safe to say
that the FLL action will correct for drift caused by the 7805's tempco,
unless you plan to dump a can of R134a on it), but others are worth bringing
to the
, October 21, 2006 7:20 PM
Subject: Re: [time-nuts] The VE2ZAZ GPSDO
Tim Shoppa wrote:
John Miles [EMAIL PROTECTED] wrote:
Some of the concerns may not be major issues (e.g., it seems safe to say
that the FLL action will correct for drift caused by the 7805's tempco,
unless you plan to dump a can
Interested in any comments on this GPSDO -
http://www3.sympatico.ca/b.zauhar/GPS_Std/GPS_Std.htm#GPS_Receivers
DaveB, NZ
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Dave Brown wrote:
Interested in any comments on this GPSDO -
http://www3.sympatico.ca/b.zauhar/GPS_Std/GPS_Std.htm#GPS_Receivers
DaveB, NZ
Why anyone would bother to create something like this escapes me.
Just another example of unintelligent engineering.
If one is foolish enough to
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