Re: [time-nuts] Low temperature coefficient capacitors for DMTD

48 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Low temperature coefficient capacitors for DMTD In message , "Lux, Jim (337C)" writes: In 1990, the conclusion of a polycarbonate film capacitor paper[1] stated, "both the orientati

Re: [time-nuts] Low temperature coefficient capacitors for DMTD

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, timecons

Re: [time-nuts] Low temperature coefficient capacitors for DMTD

> -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 tempe

Re: [time-nuts] Low temperature coefficient capacitors for DMTD

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 > PL>, "Lux, Jim (337C)" writes: >

Re: [time-nuts] Low temperature coefficient capacitors for DMTD

> > 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.. laun

Re: [time-nuts] Low temperature coefficient capacitors for DMTD

...@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:

Re: [time-nuts] Low temperature coefficient capacitors for DMTD

In message , "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 audiophile >craziness: [...] Thanks for pointing that little sho

Re: [time-nuts] Low temperature coefficient capacitors for DMTD

> -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 coef

Re: [time-nuts] Low temperature coefficient capacitors for DMTD

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 capacitors

Re: [time-nuts] Low temperature coefficient capacitors for DMTD

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 PP

Re: [time-nuts] Low temperature coefficient capacitors for DMTD

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 p...

[time-nuts] Low temperature coefficient capacitors for DMTD

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

Re: [time-nuts] Low temperature coefficient capacitors for DMTD

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 stabi

Re: [time-nuts] Low temperature coefficient capacitors for DMTD

[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 pl

[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 capacitors" The PPS capacitors are quite compact and available in surface mount too. Corby Diet Help Cheap Diet Help Tips. Click here.

[time-nuts] Low temperature coefficient capacitors for DMTD

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 virt