Thanks to all for the very helpful discussion.
Appreciatively, Kevin
On Apr 25, 2013, at 9:26 AM, Chris Albertson wrote:
> The problem with analog 10MHz is the non-linear parts at each end of
> the fiber optic. It would be hard to get a nice sine wave at the
> output.
>
> I think if you have
The problem with analog 10MHz is the non-linear parts at each end of
the fiber optic. It would be hard to get a nice sine wave at the
output.
I think if you have a requirement for very clean sine wave at the far
end you'd best try to phase lock a local XO. Send a 10 MHz square
wave down the fibe
: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] ngTADD-1
ke...@rosenberg.net said:
> For < 1ns jitter, do you have a recommendation of modulation
> (ASK/PSK?) and carrier frequency?
All the digital communication over fiber that I'm familiar with is
On Wed, 24 Apr 2013 10:09:14 -0600
Kevin Rosenberg wrote:
> On Apr 24, 2013, at 2:50 AM, Attila Kinali wrote:
> > [...]
> > low jitter (sub 1ns rise/fall times). For the transmitters, if possible
> > go for those with laser diodes and modulate them (ie no on-off switching).
> > This will give yo
ke...@rosenberg.net said:
> For < 1ns jitter, do you have a recommendation of modulation (ASK/PSK?) and
> carrier frequency?
All the digital communication over fiber that I'm familiar with is simple
on-off baseband, no carrier. Digital geeks use encoding rather than
modulation.
One complica
On Apr 24, 2013, at 2:50 AM, Attila Kinali wrote:
> [...]
> low jitter (sub 1ns rise/fall times). For the transmitters, if possible
> go for those with laser diodes and modulate them (ie no on-off switching).
> This will give you jitter way below 1ns (sorry, don't know any hard numbers).
For < 1n
Hi
The stuff I've seen is aimed at the military market. It's in the "don't even
ask about the price" category for home applications. It's also new enough that
I doubt it's on the surplus market yet. I'd haunt the auction sites for a
complete set of parts. You'll need both ends (tx and rx) *and*
On Tue, 23 Apr 2013 22:08:28 -0600
Kevin Rosenberg wrote:
> On Apr 23, 2013, at 4:16 PM, Bob Camp wrote:
> > There are optical links that are better than your typical opto coupler. I
> > have not seen many that are good to -170 dbc.
>
> Rather than for a 10 MHz signal, I might prefer an optic
On Apr 23, 2013, at 4:16 PM, Bob Camp wrote:
> There are optical links that are better than your typical opto coupler. I
> have not seen many that are good to -170 dbc.
Rather than for a 10 MHz signal, I might prefer an optical link rather than
differential for a PPS signal. Could you recommen
On Apr 23, 2013, at 4:04 PM, Bob Camp wrote:
> If you are "only" worried into 1 Hz or even 0.1 Hz, temperature on the coax
> will not be a big issue. If you are trying to maintain 170 dbc at the far end
> of the wire, shielding and isolation will be a *big* issue. You may need some
> pretty fan
Hi
There are optical links that are better than your typical opto coupler. I have
not seen many that are good to -170 dbc.
Bob
On Apr 23, 2013, at 3:58 PM, Kevin Rosenberg wrote:
> On Apr 23, 2013, at 2:24 AM, WB6BNQ wrote:
>> I had to buy the three components at three different places. Th
Hi
If you are "only" worried into 1 Hz or even 0.1 Hz, temperature on the coax
will not be a big issue. If you are trying to maintain 170 dbc at the far end
of the wire, shielding and isolation will be a *big* issue. You may need some
pretty fancy cable and magnetics to make that work….
Bob
O
On Apr 23, 2013, at 2:24 AM, WB6BNQ wrote:
> I had to buy the three components at three different places. The TOSLINK
> receiver came from Mouse (p/n 757-TORX177F,T) and cost $1.31. The TOSLINK
> transmitter came from DIGIKEY (p/n 1080-1428-ND)
> and cost $0.866. At the time, for whatever rea
On Apr 23, 2013, at 4:43 AM, Bob Camp wrote:
> Like any design, the first question is - what's the goal?
My favorite first question, too. Move my most stable OXCO in
the 1 Hz to 10 KHz range to the more stable environment,
and maintain its phase noise of -100 dBc/Hz @ 1 Hz and
-170 dBc/Hz at 10 k
Hi
Like any design, the first question is - what's the goal?
If you have enough RF running around, then shielding is well worth looking at.
How much of the cable is in "variable temperature" space? If it's all indoors /
heated living space, even tempo may not be a big deal. All that said, I'd
Hi Kevin,
You could try TOSLINK fiber cable. Yes, it is not the best as far as fiber
cable goes, but it seems to be a viable method. I got the idea from a Ham in,
I believe, Colorado who was using it to
isolate his 10 MHz for a project. If you are interested in viewing what the
other guy did
On Apr 22, 2013, at 7:13 PM, Bob Camp wrote:
> U, e. Even with all the mods, a 4501 is a fairly low resolution
> device. It's an amazing little box and I have several of them. Some (but not
> all) with the mods actually done correctly.
Ummm, apologies for the errant posting that should
Hi
U, e. Even with all the mods, a 4501 is a fairly low resolution device.
It's an amazing little box and I have several of them. Some (but not all) with
the mods actually done correctly.
You should be able to get away with a lot when driving one. Fancy distribution
"stuff" is not nee
I hope all is going well with your next-generation TADD-1. I'm thinking just
thinking about putting
a T-bolt disciplining a PRS-10 discipling a Soekris 4501. I was thinking a
TADD-1 one would be nice for driving 10 MHz line to another room with the
TADD-1 also providing galvanic isolation.
If
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