[time-nuts] HP5065 - Some OP-Amp, FB and Teflon ...

If you are willing to take a China-risk here is a good price for lots of three of them. I've bought some stuff from this seller and it has all seemed legit and worked properly... Of courese, YMMV

[time-nuts] HP5065 - Some OP-Amp, FB and Teflon ...

Corby, Thanks for the information. I was not aware of the relocated resistor. Yes, it is the DC feed-throughs. Any thaughts on a possible replacement for OPA111? I have also duplicated the revised A7 AC-Amplifier boardusing film capacitors for the notch filters and modernOP-Amps. Since I have

Re: [time-nuts] Some more info on the 5065A optical unit

Hi The gotcha with coating (at least with RF coils is that the adsorption / desorption process gets really crazy. You may slow the “going in” part down to a week. The “getting out” part may turn into (many) months. That’s what makes the “stored on a shelf and then turned on” thing a mess. It

Re: [time-nuts] Allan variance by sine-wave fitting

Hi Jim, On 11/28/2017 12:03 AM, jimlux wrote: On 11/27/17 2:45 PM, Magnus Danielson wrote: There is nothing wrong about attempting new approaches, or even just test and idea and see how it pans out. You should then compare it to a number of other approaches, and as you test things, you

Re: [time-nuts] Some more info on the 5065A optical unit

However the dimensions of the coil former vary with moisture content. Impregnation with waxes and other organic materials merely serves to slow down the rate of absorption and doesn't prevent it. Bruce > On 28 November 2017 at 12:36 Poul-Henning Kamp wrote: > > >

Re: [time-nuts] Some more info on the 5065A optical unit

Hi Yup, I’ve never measured humidity on DC coils. I have done a lot of measurements on various combinations of cardboard and “stuff’ on RF coils. Bob > On Nov 27, 2017, at 6:36 PM, Poul-Henning Kamp wrote: > > > In message

Re: [time-nuts] Some more info on the 5065A optical unit

In message <2b66d682-15cf-465f-9a34-d7f7e7929...@n1k.org>, Bob kb8tq writes: >Straight cardboard *is* an issue on RF coils in humidity. The C-field coil is DC only. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD

Re: [time-nuts] Allan variance by sine-wave fitting

-Original Message- >From: Magnus Danielson >Sent: Nov 27, 2017 2:45 PM >To: time-nuts@febo.com >Cc: mag...@rubidium.se >Subject: Re: [time-nuts] Allan variance by sine-wave fitting > >Hi, > >There is nothing wrong about attempting new approaches, or even

Re: [time-nuts] Allan variance by sine-wave fitting

On 11/27/17 2:45 PM, Magnus Danielson wrote: There is nothing wrong about attempting new approaches, or even just test and idea and see how it pans out. You should then compare it to a number of other approaches, and as you test things, you should analyze the same data with different

Re: [time-nuts] Allan variance by sine-wave fitting

Hoi Mattia, On Mon, 27 Nov 2017 23:04:56 +0100 Mattia Rizzi wrote: > >To make the point a bit more clear. The above means that noise with > > a PSD of the form 1/f^a for a>=1 (ie flicker phase, white frequency > > and flicker frequency noise), the noise (aka random

Re: [time-nuts] Allan variance by sine-wave fitting

Hi, On 11/27/2017 07:37 PM, Attila Kinali wrote: Moin Ralph, On Sun, 26 Nov 2017 21:33:03 -0800 Ralph Devoe wrote: The issue I intended to raise, but which I'm not sure I stated clearly enough, is a conjecture: Is least-square fitting as efficient as any of the other

Re: [time-nuts] Allan variance by sine-wave fitting

I'm talking about flicker noise processes 2017-11-27 23:04 GMT+01:00 Mattia Rizzi : > Hi, > > >To make the point a bit more clear. The above means that noise with > a PSD of the form 1/f^a for a>=1 (ie flicker phase, white frequency > and flicker frequency noise), the

Re: [time-nuts] Allan variance by sine-wave fitting

Hi, >To make the point a bit more clear. The above means that noise with a PSD of the form 1/f^a for a>=1 (ie flicker phase, white frequency and flicker frequency noise), the noise (aka random variable) is: 1) Not independently distributed 2) Not stationary 3) Not ergodic I think you got too

Re: [time-nuts] Allan variance by sine-wave fitting

On Mon, 27 Nov 2017 19:37:11 +0100 Attila Kinali wrote: > X(t): Random variable, Gauss distributed, zero mean, i.i.d (ie PSD = const) > Y(t): Random variable, Gauss distributed, zero mean, PSD ~ 1/f > Two time points: t_0 and t, where t > t_0 > > Then: > > E[X(t) | X(t_0)] =

[time-nuts] Some more info on the 5065A optical unit

Bob, The cardboard is impregnated with the foam insulation goop and then sealed under the foam layer. It is totally sealed off from any environmental effects. Cheers, Corby ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] Allan variance by sine-wave fitting

Moin Ralph, On Sun, 26 Nov 2017 21:33:03 -0800 Ralph Devoe wrote: > The issue I intended to raise, but which I'm not sure I stated clearly > enough, is a conjecture: Is least-square fitting as efficient as any of the > other direct-digital or SDR techniques? You stated

Re: [time-nuts] Some more info on the 5065A optical unit

Hi If the coil form really is plain old cardboard. I wonder what the impact of humidity is? With the heat rise and all the packing, it’s going to be a pretty indirect effect. It might be an issue on a unit that had been stored powered off for a number of years. Straight cardboard *is* an issue

[time-nuts] Some more info on the 5065A optical unit

Made some measurements on a 5065A optical unit. -There are 3 layers in the magnetic shield. -There is about 1/8" of insulation between the outer and middle, and between the middle and inner shields. -The C-field winding is wound on a cardboard form that fits tightly into the inner shield.

[time-nuts] HP 5065A - Some OP-Amp, FB and teflon stand off questions...

Ulf, Be careful if you are going to duplicate the new style A9 for use in a chassis that was built for the old style! On the old style chassis one of the resistors is mounted on the rear of the front panel loop switch. This resistor is mounted on the A9 module for the new style chassis. Which

Re: [time-nuts] Allan variance by sine-wave fitting

Hi, On 11/27/2017 04:05 PM, Bob kb8tq wrote: Hi On Nov 27, 2017, at 12:33 AM, Ralph Devoe wrote: Here's a short reply to the comments of Bob, Attila, Magnus, and others. Thanks for reading the paper carefully. I appreciate it. Some of the comments are quite interesting,

Re: [time-nuts] Allan variance by sine-wave fitting

Hi > On Nov 27, 2017, at 12:33 AM, Ralph Devoe wrote: > > Here's a short reply to the comments of Bob, Attila, Magnus, and others. > Thanks for reading the paper carefully. I appreciate it. Some of the > comments are quite interesting, other seem off the mark. Let's start