Bob wrote:
> You could also say that with a longer accumulator, you get a closer
> approximation to a desired waveform.
The width of the accumulator does improve the waveform, but only if you need a
frequency between the
ones possible with the more narrow accumulator.
It goes
gt;
>
> -Original Message-
> From: time-nuts [mailto:time-nuts-boun...@lists.febo.com] On Behalf Of Hal
> Murray
> Sent: Wednesday, October 07, 2020 6:18 PM
> To: Discussion of precise time and frequency measurement
> Cc: hmur...@megapathdsl.net
> Subject: Re: [time-nuts] A
, N4FS
89 Arnold Blvd.
Howell NJ 07731
848-245-9115
-Original Message-
From: time-nuts On Behalf Of Bob kb8tq
Sent: Thursday, October 8, 2020 8:15 AM
To: Discussion of precise time and frequency measurement
Cc: hmur...@megapathdsl.net
Subject: Re: [time-nuts] Aging 5065A ?
Hi
You could
To: Discussion of precise time and frequency measurement
Cc: hmur...@megapathdsl.net
Subject: Re: [time-nuts] Aging 5065A ?
kb...@n1k.org said:
> If you want to run a fixed / well regulated C Field, a DDS with (say) 48
bits
> would allow you to tune the device well past parts in 10^-15.
I
48-245-9115
>
> -Original Message-
> From: time-nuts On Behalf Of Bob kb8tq
> Sent: Wednesday, October 7, 2020 7:34 PM
> To: Discussion of precise time and frequency measurement
>
> Cc: hmur...@megapathdsl.net
> Subject: Re: [time-nuts] Aging 5065A ?
>
Hi,
The existing syntesizer is rich on spurs. Very rich in fact. Fairly strong.
However these spurs is far enough not to cause much of a problem for the
clock, but they will help to demodulate some noise.
The noise being problematic is too far in for the spurs of the synthesis
to generate any
: Re: [time-nuts] Aging 5065A ?
Hi
Well….. the existing synth in the 5065 is no champion spur wise. Coming up with
a DDS that is “as good as” is not all that crazy.
The 5 MHz reference is multiplied to 6.x GHz and then mixed with the synth. The
close in phase noise of the multiplied signal
Hi
Well….. the existing synth in the 5065 is no champion spur wise. Coming up with
a
DDS that is “as good as” is not all that crazy.
The 5 MHz reference is multiplied to 6.x GHz and then mixed with the synth. The
close in
phase noise of the multiplied signal is mixed with the synth. The
kb...@n1k.org said:
> If you want to run a fixed / well regulated C Field, a DDS with (say) 48 bits
> would allow you to tune the device well past parts in 10^-15.
I don't know how to think about a DDS in this context.
I remember years ago thinking that a DDS was the greatest thing since
of precise time and frequency measurement
>
> Subject: Re: [time-nuts] Aging 5065A ?
>
> Hi
>
> The “normal” 32 bit DDS chips only get you just so far in terms of tuning
> resolution.
> If you want to run a fixed / well regulated C Field, a DDS with (say) 48 bit
and frequency measurement
Subject: Re: [time-nuts] Aging 5065A ?
Hi
The “normal” 32 bit DDS chips only get you just so far in terms of tuning
resolution.
If you want to run a fixed / well regulated C Field, a DDS with (say) 48 bits
would allow you to tune the device well past parts in 10^-15
S
> 89 Arnold Blvd.
> Howell NJ 07731
> 848-245-9115
>
> -Original Message-
> From: time-nuts On Behalf Of Bob kb8tq
> Sent: Wednesday, October 7, 2020 11:11 AM
> To: Discussion of precise time and frequency measurement
>
> Subject: Re: [time-nuts] Aging 5065A
11:11 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Aging 5065A ?
Hi
Yup, Bert has lashed up at least one that way ( I have it here in the basement).
I am working on a board with a higher resolution DDS than the typical eBay
parts.
Bob
ions
Hi Bob like the DDS pcboards?
On Wed, Oct 7, 2020 at 10:40 AM Bob kb8tq wrote:
> Hi
>
> People have successfully mounted eBay synthesizers in 5065’s. They work
> and it is one way to take care of that.
>
> Bob
>
> > On Oct 6, 2020, at 10:49 PM, paul swed wrote:
> >
> > Will agree I would hack
Hi
People have successfully mounted eBay synthesizers in 5065’s. They work
and it is one way to take care of that.
Bob
> On Oct 6, 2020, at 10:49 PM, paul swed wrote:
>
> Will agree I would hack something in. The same for the synthesiser. I could
> swear someone on time-nuts already has.
.febo.com
> A "Discussion of precise time and frequency measurement"
> time-nuts@lists.febo.com
> Cc "Ulf Kylenfall" ulf_...@yahoo.com
> Data Tue, 6 Oct 2020 22:49:30 -0400
> Oggetto Re: [time-nuts] Aging 5065A ?
> Will agree I would hack somethi
Regarding the quest to keep a 5065A running...
The 5065 in my hobby corner was equipped with the firstversion of the
AC-Amplifier (A7) that did not have a frequency
selective 2nd harmonic detector. So I copied the later
design but made possible the use of selected polyester
precision audio
uot;Discussion of precise time and frequency measurement"
time-nuts@lists.febo.com
Cc "Ulf Kylenfall" ulf_...@yahoo.com
Data Tue, 6 Oct 2020 22:49:30 -0400
Oggetto Re: [time-nuts] Aging 5065A ?
Will agree I would hack something in. The same for the synthesiser. I could
Will agree I would hack something in. The same for the synthesiser. I could
swear someone on time-nuts already has. The phase detection circuit is
audio and it would take some experimentation. I think Corby supplied an
alternative approach on the A7 opamp so a lot of good work.
But the charcoal
Hi
Replacing the synthesizer with something more modern is certainly possible. I
have
a project (slowly moving along) to do just that. There is nothing crazy on the
logic board,
it could easily be replaced with something more modern for not a lot of money.
The phase detector / photo amp /
Having been shut of for several months I fired up the
refurbished 5065A a few weeks ago.
It has since been equipped with a new AC-amplifier
(A7) and a new Rubidium cell with the repaired lamp
(thanks to Corby Dawson) and a receiver with a
TED that was connected according to HP instructions.
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