[time-nuts] DCF77 Time/Data Display Project

DCF77 is a German longwave time signal and standard-frequency radio station. https://en.m.wikipedia.org/wiki/DCF77 There are commercial receivers and readers for DCF77, but this DIY project by Erik Deruiter from the Netherlands using the Arduino MEGA from 2016 was unique.

Re: [time-nuts] Cady Award , Enrico Rubiola

> Dear Enrico: > > Let me be the first to congratulate you on winning the 2018 Cady Award “For > ground-breaking contributions to noise analysis and signal-source theory, and > experimental achievements in the electronic and photonic domains.” I hope > you will be able to join us at the

Re: [time-nuts] The "NAKED" 5065A optical unit

On Tue, Feb 20, 2018 at 2:30 AM, Poul-Henning Kamp wrote: > If that is the case, I think it will make sense to give the lamp > its own adjustable voltage regulator (LM317), so the power can be > reduced to what is optimal/necessary without having to take the > lamp apart and

Re: [time-nuts] The "NAKED" 5065A optical unit

Corby no intent to rework the bulb. Its just I have had good success with bulbs from the FE- series when they fail to operate by heating the bulb to re-vaporize the "Stuff" that plates out. Wasn't sure if this would be an approach on the 5065 when that day comes for mine. Regards Paul WB8TSL

[time-nuts] The "NAKED" 5065A optical unit

Paul, You do NOT want to take one apart to this level! It's never going to operate again. If you look at the lamp in the PIX you will see a white coil wrapped around the bulb. This is the tank for the 90Mhz drive and it sits cocked at a 45 degree angle. The lamp assy can be removed easily via

Re: [time-nuts] The "NAKED" 5065A optical unit

Corby Really appreciate the pix. Curious. How hard was it to open the oven up and then is it equally reasonable to re-assemble it. I will guess its reasonable since you insert the filter into the system. Really curious do you see the bulb darken as if the RB is plating out? Thats what I see on

Re: [time-nuts] The "NAKED" 5065A optical unit

Its RF and mag loop. On Tue, Feb 20, 2018 at 8:49 AM, Dana Whitlow wrote: > I'm curious: > > Is the lamp RF-excited, or by DC going to internal electrodes? > > And if by RF, is the energy coupled in magnetically by a loop, > or by capacitive electrodes? > > Thanks, > >

Re: [time-nuts] The "NAKED" 5065A optical unit

I'm curious: Is the lamp RF-excited, or by DC going to internal electrodes? And if by RF, is the energy coupled in magnetically by a loop, or by capacitive electrodes? Thanks, Dana On Mon, Feb 19, 2018 at 7:08 PM, wrote: > Here is a PIX of the optical unit from a 5065A

Re: [time-nuts] Looking for some Frequency Electronics info....

Walter pure speculation. Maybe the 100 MHz is superposed to be locked to the 10 MHz. With a scope see what the drift rates are between the two. Adjust EFC slowly to get the 100 MHz to go below the 10 MHZ if its running fast. See if the light changes to green. If it does you know that the system is

Re: [time-nuts] The "NAKED" 5065A optical unit

Should have carefully read Corby's comment. Lamps left. On Tue, Feb 20, 2018 at 9:40 AM, paul swed wrote: > Wow on the right, is that the lamp? > Thats one large lamp to light. I am use to the little capsules about the > size of a pr-1 light bulb. > This is a keeper

Re: [time-nuts] The "NAKED" 5065A optical unit

Wow on the right, is that the lamp? Thats one large lamp to light. I am use to the little capsules about the size of a pr-1 light bulb. This is a keeper picture. Regards Paul WB8TSL On Tue, Feb 20, 2018 at 8:24 AM, Bob kb8tq wrote: > Hi > > Indeed very cool pictures. > > If the

Re: [time-nuts] The "NAKED" 5065A optical unit

Hi Indeed very cool pictures. If the lamp is like most gas bulb lights, there is indeed a “strike voltage” required to get things going (or an RF excitation). There inevitably is some temperature dependence as well. A constant current driver might be the better bet. Bob > On Feb 20, 2018, at

Re: [time-nuts] Looking for some Frequency Electronics info....

Hi If it works like the unit that replaced it, it has a level detect on the external input that rejects signals below some threshold. It either locks up to the internal standard or to the external input. All of the outputs are in the 7 to 13 dim range when operating. The fault circuit looks

Re: [time-nuts] The "NAKED" 5065A optical unit

In message , cdel...@juno.com writes: >Here is a PIX of the optical unit from a 5065A totally removed from the >shield assembly. Nice! >Left to right: > >Lamp assy >lamp oven cylinder >lamp reflector/convection block/diffuser >Rb85 filter cell

Re: [time-nuts] Looking for some Frequency Electronics info....

There was one listed over on that auction site, it said best offer, so I made a low offer and it was accepted !! Guess my offer was too high !! Anyway, it has the Red Fault Light on, so it has issues too. If anyone finds any info on it, I would appreciate getting it. If I find out anything