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Old 17th January 2013, 04:28 PM   #141
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Join Date: Feb 2003
Acko, Australia X1
RollE2k, Sweden X1
number9, USA X2
Klipschkid, HK, x1
randytsuch, USA X2
grufti, USA X2
kp93300, malaysia x1
Gricko,Croatia x1
NicMac, Italy x2
xtomm, Czech Republic x1
DeanoUK, UK, x2
Lil' Knight, VN x1
smanz, Spain x1
MisterRogers, USA x2
palmito USA x1
tagheuer Canada x1
shoom UK x1
Diyfan, USA x1
TheShaman, Greece x1
LuisMCP, Spain x2
qusp x1
danny_66 x1
meintan x1
mksung x 1
vanwykca UK x1
ccliu, Taiwan x2
leejh x10
bk856er, USA x1
linuxfan, Australia X1
bigpandahk, Hong Kong x 2
rsotirov, Canada x 1
DQ828, Australia x 1
Esl 63, Sweden, x 1
necplusultra Canada x1 (depends on shipping halfway accross the world)
Awh, uk, x1
enantra, Spain x3
mvaldes, Italy x1
SCompRacer, USA x1
t27049215, Taiwan x2
unixdeveloper, USA x1
nik.d, Serbia x1
markus22ch, Switzerland X2
whmok, Singapore x1
vitalica x 2
richard_pc, Taiwan x2
Malvin, USA x1
damohpi, AUS x1
Eric06,France x1
sidiropa, Greece x2
miksi, Serbia x1
glt, USA x1
hochopeper, Aus x1
fredlock, USA X1
Galvani, Country ?? X1
bkdog Australia x1
duc985 Germany x 1
opc Canada x 1

Total = 82
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Old 17th January 2013, 04:32 PM   #142
AR2 is offline AR2  United States
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Join Date: Dec 2002
Location: San Francisco, California
Acko, Australia X1
RollE2k, Sweden X1
number9, USA X2
Klipschkid, HK, x1
randytsuch, USA X2
grufti, USA X2
kp93300, malaysia x1
Gricko,Croatia x1
NicMac, Italy x2
xtomm, Czech Republic x1
DeanoUK, UK, x2
Lil' Knight, VN x1
smanz, Spain x1
MisterRogers, USA x2
palmito USA x1
tagheuer Canada x1
shoom UK x1
Diyfan, USA x1
TheShaman, Greece x1
LuisMCP, Spain x2
qusp x1
danny_66 x1
meintan x1
mksung x 1
vanwykca UK x1
ccliu, Taiwan x2
leejh x10
bk856er, USA x1
linuxfan, Australia X1
bigpandahk, Hong Kong x 2
rsotirov, Canada x 1
DQ828, Australia x 1
Esl 63, Sweden, x 1
necplusultra Canada x1 (depends on shipping halfway accross the world)
Awh, uk, x1
enantra, Spain x3
mvaldes, Italy x1
SCompRacer, USA x1
t27049215, Taiwan x2
unixdeveloper, USA x1
nik.d, Serbia x1
markus22ch, Switzerland X2
whmok, Singapore x1
vitalica x 2
richard_pc, Taiwan x1
Malvin, USA x1
damohpi, AUS x1
Eric06,France x1
sidiropa, Greece x2
miksi, Serbia x1
glt, USA x1
hochopeper, Aus x1
fredlock, USA X1
Galvani, Country ?? X1
bkdog Australia x1
duc985 Germany x 1
opc Canada x 1
AR2 USA x 2

Total 83
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Old 17th January 2013, 07:20 PM   #143
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Join Date: Jan 2007
Acko, Australia X1
RollE2k, Sweden X1
number9, USA X2
Klipschkid, HK, x1
randytsuch, USA X2
grufti, USA X2
kp93300, malaysia x1
Gricko,Croatia x1
NicMac, Italy x2
xtomm, Czech Republic x1
DeanoUK, UK, x2
Lil' Knight, VN x1
smanz, Spain x1
MisterRogers, USA x2
palmito USA x1
tagheuer Canada x1
shoom UK x1
Diyfan, USA x1
TheShaman, Greece x3
LuisMCP, Spain x2
qusp x1
danny_66 x1
meintan x1
mksung x 1
vanwykca UK x1
ccliu, Taiwan x2
leejh x10
bk856er, USA x1
linuxfan, Australia X1
bigpandahk, Hong Kong x 2
rsotirov, Canada x 1
DQ828, Australia x 1
Esl 63, Sweden, x 1
necplusultra Canada x1 (depends on shipping halfway accross the world)
Awh, uk, x1
enantra, Spain x3
mvaldes, Italy x1
SCompRacer, USA x1
t27049215, Taiwan x2
unixdeveloper, USA x1
nik.d, Serbia x1
markus22ch, Switzerland X2
whmok, Singapore x1
vitalica x 2
richard_pc, Taiwan x1
Malvin, USA x1
damohpi, AUS x1
Eric06,France x1
sidiropa, Greece x2
miksi, Serbia x1
glt, USA x1
hochopeper, Aus x1
fredlock, USA X1
Galvani, Country ?? X1
bkdog Australia x1
duc985 Germany x 1
opc Canada x 1
AR2 USA x 2

Total: 85
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Old 17th January 2013, 08:18 PM   #144
glt is offline glt  United States
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Default Potato vs Others

Seems we are getting a panel with 2 boards: one with potato foot prints and the other with standard FF. The Potato FF have "odd" footprints for a FF likely due to their noise reduction designs. (However, the Potato is easier to solder)

Whether you use one or the other, they will run at the exact same speed which is the speed of the clock you feed to it.

If you look at their documentation, the Potato part uses clever layout and design to reduce noise while using the same semiconductor fab technology as the standard parts.

So in theory, at the same speed, the POTATO will run at lower noise and in theory add less jitter.

While less jitter is nice, recent measurements by Ian (I think on his dual board with a standard clock using standard FF) show 5 ps RMS. This is already near noise floor of megabuck equipment.

But this being diy, we find satisfaction in over designing our gizmos :-)
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Old 17th January 2013, 09:31 PM   #145
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glt,

I have no problem with the OTT solution to any problem, as long as the user is aware of any technical downside to the OTT solution that they choose.

I will expand on what I said earlier in this thread, the Potato FF WILL cause problems if the subsequent cables/DAC are less than EXCELLENT design. As the rise time of the signal will be less than 10% of the period of the clock then the design of the PCB and conductors carrying the signal must be considering of the behaviour of the higher freq and bandwidth of the signal they must now carry. The Potato FF is designed to operate up to GHz frequencies so its tr is much quicker than the other parts.

tr/tf is the time for signal to go from 10% - 90% and on the Potato FFs in this case are speced for 0.8ns.

See the first point raised here - Red Flags

The kicker here is that your point to point wired reclocking with these chips may work but they are going to cause issues with radiated noise and conducted noise added to your system. Faster tr is not the holy grail in low jitter systems IMO though it may contribute. The lower noise design of the chip is meaningless if it is trumped by feeding a very fast tr/tf signal into a system that is simply unequipped to manage a signal of the speed.

Hope this helps to clear up some confusion for everyone.

Chris

Last edited by hochopeper; 17th January 2013 at 09:36 PM.
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Old 17th January 2013, 11:05 PM   #146
glt is offline glt  United States
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I agree that my hack is not very good, but works in my system. But aren't we talking about this board? Should we expect less than excellent design from Acko?.
And BTW I also have a Buffalo DAC and suspect most people here are going to use it with a Buffalo or an Acko DAC....
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Last edited by glt; 17th January 2013 at 11:18 PM.
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Old 17th January 2013, 11:13 PM   #147
qusp is offline qusp  Australia
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glt, you are missing the point, the signal doesnt stay on this board does it?

and 'working' seems to be completely subjective in this/your case. for instance sending it to less than well grounded, less than well terminated devices may mean worse performance from the faster part, due to lack of ability to deal with such fast signals. again we are not talking about clock speed, though that is a factor.

Last edited by qusp; 17th January 2013 at 11:18 PM.
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Old 17th January 2013, 11:31 PM   #148
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Quote:
Originally Posted by glt View Post
I agree that my hack is not very good, but works in my system. But aren't we talking about this board? Should we expect less than excellent design from Acko?.
Perhaps I wasn't clear enough that the requirement is for the devices that connect to the signals that this device creates. Acko has said the extra time needed to lay out the high speed board and he has the knowledge to produce a design suitable for these speeds, he's been doing this stuff for a while now.


Cheers,
Chris
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Old 17th January 2013, 11:45 PM   #149
glt is offline glt  United States
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Aren't we mainly talking about Amanero, Acko reclocking board and either Buffalo or Acko DAC?

I am planning on replacing my reclocker board with this board. What is the specific concern should I have?
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Old 17th January 2013, 11:46 PM   #150
supra is offline supra  Australia
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Quote:
Originally Posted by TheShaman View Post
Acko, Australia X1
RollE2k, Sweden X1
number9, USA X2
Klipschkid, HK, x1
randytsuch, USA X2
grufti, USA X2
kp93300, malaysia x1
Gricko,Croatia x1
NicMac, Italy x2
xtomm, Czech Republic x1
DeanoUK, UK, x2
Lil' Knight, VN x1
smanz, Spain x1
MisterRogers, USA x2
palmito USA x1
tagheuer Canada x1
shoom UK x1
Diyfan, USA x1
TheShaman, Greece x3
LuisMCP, Spain x2
qusp x1
danny_66 x1
meintan x1
mksung x 1
vanwykca UK x1
ccliu, Taiwan x2
leejh x10
bk856er, USA x1
linuxfan, Australia X1
bigpandahk, Hong Kong x 2
rsotirov, Canada x 1
DQ828, Australia x 1
Esl 63, Sweden, x 1
necplusultra Canada x1 (depends on shipping halfway accross the world)
Awh, uk, x1
enantra, Spain x3
mvaldes, Italy x1
SCompRacer, USA x1
t27049215, Taiwan x2
unixdeveloper, USA x1
nik.d, Serbia x1
markus22ch, Switzerland X2
whmok, Singapore x1
vitalica x 2
richard_pc, Taiwan x1
Malvin, USA x1
damohpi, AUS x1
Eric06,France x1
sidiropa, Greece x2
miksi, Serbia x1
glt, USA x1
hochopeper, Aus x1
fredlock, USA X1
Galvani, Country ?? X1
bkdog Australia x1
duc985 Germany x 1
opc Canada x 1
AR2 USA x 2

Total: 85
RollE2k, Sweden X1
number9, USA X2
Klipschkid, HK, x1
randytsuch, USA X2
grufti, USA X2
kp93300, malaysia x1
Gricko,Croatia x1
NicMac, Italy x2
xtomm, Czech Republic x1
DeanoUK, UK, x2
Lil' Knight, VN x1
smanz, Spain x1
MisterRogers, USA x2
palmito USA x1
tagheuer Canada x1
shoom UK x1
Diyfan, USA x1
TheShaman, Greece x3
LuisMCP, Spain x2
qusp x1
danny_66 x1
meintan x1
mksung x 1
vanwykca UK x1
ccliu, Taiwan x2
leejh x10
bk856er, USA x1
linuxfan, Australia X1
bigpandahk, Hong Kong x 2
rsotirov, Canada x 1
DQ828, Australia x 1
Esl 63, Sweden, x 1
necplusultra Canada x1 (depends on shipping halfway accross the world)
Awh, uk, x1
enantra, Spain x3
mvaldes, Italy x1
SCompRacer, USA x1
t27049215, Taiwan x2
unixdeveloper, USA x1
nik.d, Serbia x1
markus22ch, Switzerland X2
whmok, Singapore x1
vitalica x 2
richard_pc, Taiwan x1
Malvin, USA x1
damohpi, AUS x1
Eric06,France x1
sidiropa, Greece x2
miksi, Serbia x1
glt, USA x1
hochopeper, Aus x1
fredlock, USA X1
Galvani, Country ?? X1
bkdog Australia x1
duc985 Germany x 1
opc Canada x 1
AR2 USA x 2
supra X 2

TOTAL :87
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