Danielson
Gesendet: Montag, 28. September 2009 00:38
An: Discussion of precise time and frequency measurement
Betreff: Re: [time-nuts] 4046 variations (was EPE GPS)
Jim,
Lux, Jim (337C) wrote:
Design AND component...
Easy to claim heritage if all you do is change a resistor
The old King Radio (then Bendix-King now part of Honeywell) Silver crown
aircraft radios used 4046's in some of the synthesisers. The one in the VHF com
had a different King part number to that in the ADF (MF direction finder).
While trouble shooting we tried an ADF chip in a VHF (didn't have
Margina design? ;) Better said, very poor design.
Does not sound very good that same part, same lot code, sometimes work
here but not there, sometimes does not work at all... Extending it a
bit... sometimes will work at a given temperature, sometimes will not at
a given other.
Regards,
On 9/27/09 7:22 AM, Javier Herrero jherr...@hvsistemas.es wrote:
Margina design? ;) Better said, very poor design.
Does not sound very good that same part, same lot code, sometimes work
here but not there, sometimes does not work at all... Extending it a
bit... sometimes will work at a
Yes, of course, some applications needs the parts that are in the better
side of the distribution curve for a particular parameter and for a
particularly stringent application, as you mention :), but I think that
a 4046 seems a part that should not have to be so critical that even in
the same
been a
big No-No!
Regards,
Francesco
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com]on
Behalf Of Javier Herrero
Sent: Sunday, September 27, 2009 9:23 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] 4046 variations
On 9/27/09 9:54 AM, Javier Herrero jherr...@hvsistemas.es wrote:
Yes, of course, some applications needs the parts that are in the better
side of the distribution curve for a particular parameter and for a
particularly stringent application, as you mention :), but I think that
a 4046 seems
Yes, I'm also familiarized with space qualified EEE components, and
lately I hear the word heritage more frequently that I would like ;)
The only design I've made for aircraft electronics was for a commercial
aircraft application, and the components selection was a lot less
restringent than
. The rules said a specific type of fuse must be used at the
input, the minimum rating of that approved type of fuse was 3.15A!
Robert G8RPI.
--- On Sun, 27/9/09, Lux, Jim (337C) james.p@jpl.nasa.gov wrote:
From: Lux, Jim (337C) james.p@jpl.nasa.gov
Subject: Re: [time-nuts] 4046
Javier Herrero wrote:
Yes, I'm also familiarized with space qualified EEE components, and
lately I hear the word heritage more frequently that I would like ;)
The only design I've made for aircraft electronics was for a commercial
aircraft application, and the components selection was a lot
The part might look wrong without this information. One case was a 3.15A
fuse in series with a 27R resistor at the 28V supply input. The fuse can
never blow (no the aircraft didn't have 115V 400Hz supplies).
The reason was a pater exercise to obtain intrinsic safety approval without
formal
On 9/27/09 1:54 PM, Magnus Danielson mag...@rubidium.dyndns.org wrote:
Javier Herrero wrote:
Yes, I'm also familiarized with space qualified EEE components, and
lately I hear the word heritage more frequently that I would like ;)
The only design I've made for aircraft electronics was for a
Jim,
Lux, Jim (337C) wrote:
Design AND component...
Easy to claim heritage if all you do is change a resistor or a capacitor.
Tougher to claim if you change the active components, particularly if it's
functionally different (e.g. Substituting a 2n3904 for a 2n isn't a huge
deal.. Changing
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