Bert Kehren and I are working on a low cost DMTD system.
We are cloning the NBS 106D design with modern components.
You might want to check out PPS dialectric capacitors. (Polyphenylene
sulfide)
Readily available in many values including large ones.
For stability from 55° to +85°C, PPS is
Almost forgot!
The reason I posted the original message was the reference to four inch
long plastic capacitors
The PPS capacitors are quite compact and available in surface mount too.
Corby
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[mailto:time-nuts-boun...@febo.com] On
Behalf Of Corby Dawson
Sent: Monday, January 25, 2010 12:54 PM
To: time-nuts@febo.com
Subject: [time-nuts] Low temperature coefficient capacitors for DMTD
Almost forgot!
The reason I posted the original message was the reference to four inch
long plastic
Corby Dawson wrote:
Bert Kehren and I are working on a low cost DMTD system.
We are cloning the NBS 106D design with modern components.
You might want to check out PPS dialectric capacitors. (Polyphenylene
sulfide)
Readily available in many values including large ones.
For stability from
The NBS DMTD uses a .15uf polycarbonate capacitor for the filter channel.
The polycarbonate TC is a bit better than the PPS but they are hard to
find for the mini DMTD at a decent cost.
Most manufacturers no longer make polycarbonate capacitors.
The substitution of the PPS capacitors into the
In message 20100125.140436.3508.5.cdel...@juno.com, Corby Dawson writes:
Most manufacturers no longer make polycarbonate capacitors.
The advent of CD's made polycarbonate ridiculously expensive and
priced them out of the market...
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
Corby Dawson wrote:
The NBS DMTD uses a .15uf polycarbonate capacitor for the filter channel.
The polycarbonate TC is a bit better than the PPS but they are hard to
find for the mini DMTD at a decent cost.
Most manufacturers no longer make polycarbonate capacitors.
The substitution of the PPS
Polycarbonate film production ceased about 10 years ago.
Bruce
They're not quite dead yet...
http://www.polycarbonatecapacitors.com/
But I wouldn't use them unless forced to at gunpoint, since they are quite the
boutique item these days.
I too have had good success with the PPS
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of David Forbes
Sent: Monday, January 25, 2010 2:22 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Low temperature coefficient capacitors for DMTD
In message ece7a93bd093e1439c20020fbe87c47fed2b80a...@altphyembevsp20.res.ad.j
PL, Lux, Jim (337C) writes:
Seems that boutique item and time-nut might go together, if there
was an actual performance advantage. Besides, think of the bragging
rights from some of this stuff. It could be worse than
...@febo.com] On
Behalf Of Poul-Henning Kamp
Sent: Monday, January 25, 2010 5:12 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Low temperature coefficient capacitors for DMTD
In message 20100125.140436.3508.5.cdel...@juno.com, Corby Dawson writes:
Most
Why would JPL study obscure production details of polycarbonate
film capacitors in 1990, if they fell of the market six years earlier ?
We study all manner of obscure stuff here. Comes from using 20 year old parts
in spacecraft that will last another 20 years. Consider Cassini..
Hi
My understanding is that it was part of a several decades long multi-billion
dollar Coast Guard program to enhance the long term reliability of the Loran-C
transmitter chains .
Bob
On Jan 25, 2010, at 5:47 PM, Poul-Henning Kamp wrote:
In message
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Poul-Henning Kamp
Sent: Monday, January 25, 2010 2:48 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Low temperature coefficient capacitors
Finding an old 1992 MTT paper by Mysoor, et al., that describes the design of
the Deep Space Transponder (DST), which is what's in Voyager..
There's a second order lowpass filter in the tracking PLL. The two time
constants are 3556 seconds and 0.0556 seconds (time constant of the pole,
of precise time and frequency measurement
Subject: Re: [time-nuts] Low temperature coefficient capacitors for DMTD
In message ece7a93bd093e1439c20020fbe87c47fed2b80a...@altphyembevsp20.res.ad.j
PL, Lux, Jim (337C) writes:
In 1990, the conclusion of a polycarbonate film capacitor
paper
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