My apologies, I stand corrected.
Steve
On 23 June 2010 16:32, John Allen j...@pcsupportsolutions.com wrote:
Um, This group/list/reflector is NOT related to Yahoo, but is hosted on
febo.com
thanks to John Ackerman, N8UR. Thanks, John
John Allen K1AE
-Original Message-
From:
Hi Leigh,
I can't comment on the crystal filter option., but I've found that the packaged
filters and filter/balun modules from old 10Mb/s Ethernet cards work well. See
this excellent little page by Dave G4HUP
http://g4hup.com/DA/Filters%20Transformers%20and%20DC%20Converters.pdf
Robert
Bob,
On 23 June 2010 15:13, Robert Benward rbenw...@verizon.net wrote:
Steve,
It is admirable that you stick up for Warren. Part of Warren's problem is
Now, let's please get this straight, I have been trying to act as a
facilitator in all of this because I believe that I know what the ral
On a military satcom program in the mid 80's that I worked on, we used a 10
MHz crystal filter with about a 100 Hz BW to reduce phase noise of our Rb
source. Regards - Mike
Mike B. Feher, N4FS
89 Arnold Blvd.
Howell, NJ 07731
732-886-5960
-Original Message-
From:
If your concern is to clean up the harmonics, a crystal ladder filter is
probably not the best choice, a low pass filter would be easier to design,
would probably require no adjustment and be cheaper in parts with less effect
on the fundamental signal you are interested in.
If your concern is
At 12:54 AM 6/23/2010, Leigh L. Klotz, Jr WA5ZNU wrote...
At the local flea market, I picked up what appears to be an Efratom
FRS-C. It is marked TTL internally. It has the passive connector
board, but not the active board with the 15 MHz synthesizer on it.
Connector board? No such beast
In a message dated 23/06/2010 14:12:00 GMT Daylight Time,
mi...@flatsurface.com writes:
At the local flea market, I picked up what appears to be an Efratom
FRS-C. It is marked TTL internally. It has the passive connector
board, but not the active board with the 15 MHz synthesizer on
...
Mine is marked TTL internally. The service manual has a chart
showing the differences between the sine and TTL options, and I
converted it to the sine version by changing a jumper to a resistor
and populating an LC filter with 10uH and 100pF (~5 MHz). I also
terminated the RF
Dear Steve,
In a word: WORD! Nowhere, in my recent experience, has the expert
syndrome been so painfully obvious.
Ah, the ecstasy of sanctimony!
On 6/23/2010 5:00 AM, time-nuts-requ...@febo.com wrote:
Send time-nuts mailing list submissions to
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Mike S wrote:
It sounds like you made the changes to the A4 oscillator board, but not
the ones to the A3 power supply board (several inductors, resistors
and caps). I found that using a 1 uF for C16, instead of the
documented 0.1 uF, gives a better signal.
See the top of page A-15 in the
...
[snip]
If you need a sine wave output but don't want to change anything inside,
just add a lowpass filter.
A 5th order LPF (three inductors/ 2 caps or vice versa) should give you
a clean sine wave output.
Just add a coupling cap to remove the DC component.
Adrian
_
Thank you,
At 04:19 PM 6/23/2010, Leigh L. Klotz, Jr. WA5ZNU wrote...
If you have these values we can document the rest of this process in
one
place.
10 MHz sine TTL
L1 ?.? uH L1 OMIT
L2 1? uH Replace with R23 130 OHM 1 WATT
R16 ?10 OHM NOM
Leigh,
A narrow filter around 10MHz is likely to show phase ripple in its passband,
and that will most certainly vary over temperature, not a good thing for ADEV,
that's why a LPF is preferred.
Also, most crystal filters may not be happy with the output level of a typical
OCXO, so you would
Thank you, Didier.
That pretty much sums it up. I was aware of the signal level issue but
didn't consider that passband ripple would be temperature sensitive. It's
fun learning to think in the long time domain.
In the meantime I've found a 10 mbit ethernet ISA card in my office and
will follow
@ Steve Rooke -- Warren and I have had correspondence in the past about other
things, and I was very interested in his TPLL implementation. Someone in the
thread had asked Warren if he would supply a schematic diagram of his
particular set-up. I never saw an answer to that, so I asked too.
I do not understand why the passband ripple would be of any consequence in
the big (or small as we typically talk about) picture. During any
measurement interval, it will be a constant, for all practical purposes,
including ours. A measurement at a different time, at a different
temperature that
Has anyone ever put another GPS in a Z3801A? Will the software accommodate
another GPS that tracks say, 12 channels?
Bob
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Mike,
I agree with you that for SatCom application, long term stability is not as
much of a concern, phase noise typically is the main issue.
But I suspect that for a time nuts looking at stability over periods of hours
or days, temperature effects cannot be ignored. Passband ripple usually
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