Matt,
It's not easy to see but if you look at the 72h plot, you can see that
the EFC voltage stops at a low value before the event and then
continues at a higher voltage after it. Look at the EFC level values
before and after.
This is the first time I've seen anything of the magnitude on the
Hi
The DAC will quite nicely produce a trapezoid (or clipped triangle wave). It's
certainly on the list.
---
I've had a lot of lunch time discussions with the NIST guys about their
obsession with input levels. About all I can say is that I don't see the same
sensitivities they do. I suspect
Hi
The 2.x firmware is the magic that lets it run down to HF type frequencies. You
really do not want to upgrade the firmware.
It would be very nice to find a back shelf somewhere with a set of original
manuals for the 2.x version.
Now if it just had a SR-620 counter built into it
Bob
Hi Don,
Congratulations on the E8285A. I've an 8924C that does me nicely and came with
a bunch of other stuff including two 10811A's and a crystal impedance meter
(gotta keep on-topic) for £300 (~$500). Another useful instrument in the range
that can sometimes be picked up cheaply is the 8922X
Bird wattmeters, such as the model 43 thruline, are far from
accurate devices. They are spec'd to be +/- 5% of the full scale
reading of the installed slug.
That means for a 100W slug, the error band is +/- 5W!
If you happen to read 20W on the meter, the error band says your
true power could
At 07:42 AM 2/2/2010 , Robert Atkinson wrote:
than a 141T setup. I think you will find that the E8285A is the same as the
8924C and uses non-volatile RAM cards, not flash. These cards are rare now
and
have CMOS ram and a lithium coin cell. You MIGHT be able to read a flash
card,
but I'm pretty
A widely used WW-II aircraft radio altimeter used a triangular waveform to
FM modulate a 400 MHz oscillator, employing a mechanical variable capacitor
constructed similar to a permanent-magnet loudspeaker. To get the
capacitor's diaphragm to reverse accurately, at the positive peak of the
You want the stuff sold for laxative use, USP Mineral Oil, sometimes
trademarked Nujol. You do NOT want Baby Oil.
-John
Hi
Some drug store mineral oil has extra stuff in it. This is one case
where you want the cheap generic version rather than the improved name
brand.
Bob
Hello all,
sorry for the OT, but I know there're many real electronic artists here.
As an amateur radio operator I often use transverters, some home made.
They usually can be made sigthly better (RF and noise-wise) than
japanese transceivers. However often the LO xtal oscillator drifts too
much
Hello Francesco:
you can use my xlock, http://www.qslnet.de/member/on4iy/xlock/xlock.html
You will have to add a varicap to make the XO into a VCXO.
There should not be any noticable noise increase due to the PLL - make
sure you use a good reference 10MHz in yr GPSDO!
73 xtof on4iy
On 02/02/10
Hi
The first issue - your oscillator may be drifting quite a lot. If so, that's
the first thing to check and possibly fix. A reasonable oscillator should be
able to hold less than 100 Hz at 42 MHz under normal room conditions. Fixes
range from circuit improvements, to a better crystal, to simply
Hi
The memory in the E8285A has a lithium cell associated with it. One of my
big questions is weather the firmware goes away when the coin cell dies
(battery backed SRAM) or if the firmware is in something a bit more robust.
Hopefully it's sitting on the porch when I get home tonight
--
Hi
Sounds *very* useful.
Which version(s) of FreeBSD have you tried it on?
Thanks!
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Ralph Smith
Sent: Tuesday, February 02, 2010 12:41 PM
To: time-nuts@febo.com
Subject:
On Tue, February 2, 2010 12:47 pm, Bob Camp wrote:
Hi
Sounds *very* useful.
Which version(s) of FreeBSD have you tried it on?
8.0-STABLE, but it should be good for earlier versions.
Ralph (AB4RS)
___
time-nuts mailing list -- time-nuts@febo.com
Hi Bob,
On 2/2/10, Bob Camp li...@cq.nu wrote:
Hi
The first issue - your oscillator may be drifting quite a lot. If so, that's
the first thing to check and possibly fix. A reasonable oscillator should be
able to hold less than 100 Hz at 42 MHz under normal room conditions. Fixes
range
Hi
I'm running 8 on most of my stuff now, so that should not be an issue. If
you had come back with 6.1 that might have been reason to stop and think a
bit.
Does the program take care of all the serial line setup stuff, or are there
links and stuff that need to be done to get it to talk right?
On Tue, February 2, 2010 12:58 pm, Bob Camp wrote:
Hi
I'm running 8 on most of my stuff now, so that should not be an issue. If
you had come back with 6.1 that might have been reason to stop and think a
bit.
Does the program take care of all the serial line setup stuff, or are
there
links
Frank,
My suggestion would be to try injection locking, rather than a PLL. No
change is made to the 22MHz and 42MHz oscillators, except to find a way
to inject enough reference power to force them to lock to it. Injection
locking works well with modest harmonic relationships, and gives good
noise
Hi
I happen to like the Analog Devices ADF4001 for this sort of thing. You
would need two of them, one for each oscillator. The National chip
mentioned earlier will also work. The 2306 it's self is obsolete, but I'm
sure there are other National parts that will drop into the same socket.
On Tue, February 2, 2010 12:53 pm, Ralph Smith wrote:
On Tue, February 2, 2010 12:47 pm, Bob Camp wrote:
Hi
Sounds *very* useful.
Which version(s) of FreeBSD have you tried it on?
8.0-STABLE, but it should be good for earlier versions.
It should also port to Linux easily with minimal
Hi Murray,
On 2/2/10, Murray Greenman murray.green...@rakon.com wrote:
Frank,
My suggestion would be to try injection locking, rather than a PLL. No
change is made to the 22MHz and 42MHz oscillators, except to find a way
to inject enough reference power to force them to lock to it.
Hi Murray,
On 2/2/10, Murray Greenman murray.green...@rakon.com wrote:
Frank,
My suggestion would be to try injection locking, rather than a PLL. No
change is made to the 22MHz and 42MHz oscillators, except to find a way
to inject enough reference power to force them to lock to it.
francesco messineo wrote:
Hi Murray,
On 2/2/10, Murray Greenmanmurray.green...@rakon.com wrote:
Frank,
My suggestion would be to try injection locking, rather than a PLL. No
change is made to the 22MHz and 42MHz oscillators, except to find a way
to inject enough reference power to
Hi Bob: I finally figured that out. I had the manuals printed, anyway.
kinda added to the cost, but...
Don
Bob Camp
Hi
The 2.x firmware is the magic that lets it run down to HF type
frequencies. You really do not want to upgrade the firmware.
It would be very nice to find a back shelf
Bob Camp wrote:
Hi
The DAC will quite nicely produce a trapezoid (or clipped triangle wave). It's
certainly on the list.
---
I've had a lot of lunch time discussions with the NIST guys about their
obsession with input levels. About all I can say is that I don't see the same
sensitivities
Modern radar altimeters also use triangular wave FM modulation but at around
4.2GHz. Mix the return signal with a sample of the transmitter and you get an
audio tone directly proportional to the round trip delay and thus height. works
down to a few feet, pretty good for a real time time
-Original Message-
From: Murray Greenman
Sent: Wednesday, 3 February 2010 9:00 a.m.
To: 'time-nuts@febo.com'
Subject: Injection locking
Frank,
Bruce's collection would be a good place to start. Thanks Bruce. Most of
the examples relate to microwave applications, where often there is
Hi Murray and all,
Yes, indeed injection locking looks very interesting, and I started
reading around. Seems relatively easy for 22 MHz, but not as easy for
42 MHz (good values should be 6 or 7 MHz, right?).
So far the practical circuit I've seen are few, and this would make me
lean in favour of
To generate either 6MHz or 7MHz from 10MHz one can always use something
akin to a conjugate regenerative divider.
For 7Mhz this requires a mixer a 7MHz bandpass filter, a 3MHz bandpass
filter, a couple of power splitter/combiners, and a couple of amplifiers.
For 6Mhz this requires a mixer a 6MHz
However injection locking also works when the frequencies ratios
involved are rational numbers.
For 22MHz and 10MHz, the corresponding ratio is 11/5 a rational number.
For 42MHz and 10MHz, the frequency ratio is 21/5 a rational number
Bruce
Bruce Griffiths wrote:
To generate either 6MHz or
Hello all.
I received an EFRATOM LPRO-101 last week from eBay Fluke 1, and wired it
up last night. The results are not good.
Using a HP 5370B counter with calibration less than one year old, the
frequency reads = 10,000,146,012.9
Power Applied = 24.9Vdc @ 0.30 amps after warm up
Lamp
On 2/2/10, Bruce Griffiths bruce.griffi...@xtra.co.nz wrote:
However injection locking also works when the frequencies ratios involved
are rational numbers.
For 22MHz and 10MHz, the corresponding ratio is 11/5 a rational number.
For 42MHz and 10MHz, the frequency ratio is 21/5 a rational
Buy another one, they are so cheap :-)
Out of the last lot of five that I bought from the same source, four
work very well and one is marginal - sometimes it locks but it's
noisy, sometime does not lock.
Lamp and xtal voltage are ok, but it jumps up and down by 1E10. Very
positive overall,
francesco messineo wrote:
On 2/2/10, Bruce Griffithsbruce.griffi...@xtra.co.nz wrote:
However injection locking also works when the frequencies ratios involved
are rational numbers.
For 22MHz and 10MHz, the corresponding ratio is 11/5 a rational number.
For 42MHz and 10MHz, the
Frank,
As Bruce suggests, you can in theory lock any rational number ratio,
including 11/5 and 21/5. However, the locking gain drops off as the
ratio becomes more extreme, and thus the lock range and potential
stability are degraded.
Yes, you could certainly use a regenerative divider to
I had exactly the same symptom on one of my units: a comparator circuit fails
to detect the passing
of the sweept voltage over the upper treshold of about 12.5V. The problem was
R215 on the bottom face of the pcb, 100K.
Sometimes it is not a matter of budget, at least in my case, and trying to
It's the AN/APN-1 in the USAAC version. There is also a USN version with
slight differences.
-John
==
A widely used WW-II aircraft radio altimeter used a triangular waveform to
FM modulate a 400 MHz oscillator, employing a mechanical variable
capacitor
constructed similar to
Hi
If you do go the injection locking route check a couple of things:
1) Be sure to do the math and keep the 3db bandwidth down to the ~20 Hz
range. Otherwise you will be getting more phase noise than you probably
should. Generally this means having some kind of control on how much power
you are
American LORAN C will shut down at 2000z Feb 8
Dual rated chains that serve Canada will operate till 1 Oct.
As an example North East 9960 will be off but Canadian 5930 will operate
till Oct.
Have used 5930 for years from Boston as a reference.
North American LORAN will be completely quite by Oct
Hi
At least when they were brand new, the Austron's had no problem at all locking
to chains in Iceland and Europe from the central US. That was with the US
chains going full bore
Bob
On Feb 2, 2010, at 5:37 PM, paul swed wrote:
American LORAN C will shut down at 2000z Feb 8
Dual rated
Hi
The NIST guys at least at lunch would come back with We only put enough in to
get the paper published. The rest of he details will appear in another paper
down the road. Some of the stuff has been coming out a piece at a time for 30
years now .
Bob
On Feb 2, 2010, at 2:32 PM, Bruce
Bob Camp wrote:
Hi
At least from the last time I tried it:
If you use a sine wave input source, it's got to be an amazingly good 10 Hz sine wave. A normal audio generator will not produce a 10 Hz output with good enough short term stability / noise to give you useful data. Audio generators may
If you use the integrator-hysteresis approach, make VERY sure the FB
capacitor has excellent dC/dV, otherwise the ramp will NOT be linear. I
built one ages ago, using a ceramic capacitor and it produced near a sine.
-John
==
Bob Camp wrote:
Hi
At least from the last time I
Magnus Danielson wrote:
Bob Camp wrote:
Hi
At least from the last time I tried it:
If you use a sine wave input source, it's got to be an amazingly good
10 Hz sine wave. A normal audio generator will not produce a 10 Hz
output with good enough short term stability / noise to give you
Bruce Griffiths wrote:
Bob Camp wrote:
Hi
At least from the last time I tried it:
If you use a sine wave input source, it's got to be an amazingly good
10 Hz sine wave. A normal audio generator will not produce a 10 Hz
output with good enough short term stability / noise to give you
useful
Bob Camp wrote:
Hi
The DAC will quite nicely produce a trapezoid (or clipped triangle wave). It's certainly on the list.
---
I've had a lot of lunch time discussions with the NIST guys about their obsession with input levels. About all I can say is that I don't see the same sensitivities
Magnus Danielson wrote:
When both the RF and LO ports are saturated, the mixer output
waveform depends on how the IF port is terminated.
The output is indeed approximately triangular with your IF port
termination method when both the RF and LO ports are saturated.
My experience says that
time-nuts-boun...@febo.com wrote on 02/02/2010 07:20:24 PM:
From:
Bruce Griffiths bruce.griffi...@xtra.co.nz
To:
Discussion of precise time and frequency measurement
time-nuts@febo.com
Date:
02/02/2010 07:27 PM
Subject:
Re: [time-nuts] Triangle Waves
Sent by:
Joseph M Gwinn wrote:
time-nuts-boun...@febo.com wrote on 02/02/2010 07:20:24 PM:
From:
Bruce Griffithsbruce.griffi...@xtra.co.nz
To:
Discussion of precise time and frequency measurement
time-nuts@febo.com
Date:
02/02/2010 07:27 PM
Subject:
Re: [time-nuts] Triangle Waves
No. Unless the up and down ramps were PERFECTLY matched and the opamp had
ZERO offset, the imperfections would integrate up or down, eventually
saturating the opamp. You could make the integrator less perfect by adding
a R in parallel w/ the FB cap, but it'll not be an integrator any more.
-John
Hi
At least the last time I tried it, the filter a square wave / integrate based
on a square wave approach both appeared to give performance that was
inadequate. Simply put, the triangle wave should give *better* performance than
a similar wave generated off of a pair of good oscillators. That
time-nuts-boun...@febo.com wrote on 02/02/2010 08:19:26 PM:
From:
Bruce Griffiths bruce.griffi...@xtra.co.nz
To:
Discussion of precise time and frequency measurement
time-nuts@febo.com
Date:
02/02/2010 08:20 PM
Subject:
Re: [time-nuts] Triangle Waves
Sent by:
Frank,
You might want to take a look in here also.
Hardly gets any simpler than this ;-)
http://w3ref.cfn.ist.utl.pt/cupido/reflock.html
Luis Cupido
ct1dmk.
On 02/02/10 16:50, francesco messineo wrote:
Hello all,
sorry for the OT, but I know there're many real electronic artists here.
As
Joseph M Gwinn wrote:
time-nuts-boun...@febo.com wrote on 02/02/2010 08:19:26 PM:
From:
Bruce Griffithsbruce.griffi...@xtra.co.nz
To:
Discussion of precise time and frequency measurement
time-nuts@febo.com
Date:
02/02/2010 08:20 PM
Subject:
Re: [time-nuts] Triangle Waves
Bruce Griffiths wrote:
Joseph M Gwinn wrote:
time-nuts-boun...@febo.com wrote on 02/02/2010 08:19:26 PM:
From:
Bruce Griffithsbruce.griffi...@xtra.co.nz
To:
Discussion of precise time and frequency measurement
time-nuts@febo.com
Date:
02/02/2010 08:20 PM
Subject:
Re: [time-nuts]
Joseph M Gwinn wrote:
time-nuts-boun...@febo.com wrote on 02/02/2010 09:13:26 PM:
From:
Bruce Griffithsbruce.griffi...@xtra.co.nz
To:
Discussion of precise time and frequency measurement
time-nuts@febo.com
Date:
02/02/2010 09:16 PM
Subject:
Re: [time-nuts] Triangle Waves
On Feb 2, 2010, at 9:29 PM, Joseph M Gwinn wrote:
time-nuts-boun...@febo.com wrote on 02/02/2010 09:13:26 PM:
From:
Bruce Griffiths bruce.griffi...@xtra.co.nz
To:
Discussion of precise time and frequency measurement
time-nuts@febo.com
Date:
02/02/2010 09:16 PM
Subject:
On Feb 2, 2010, at 9:57 PM, Bruce Griffiths wrote:
Joseph M Gwinn wrote:
Figure 8 (attached) from Collin's paper indicates that the jitter of a 100Hz
wien bridge oscillator is of the order of a few hundred nanosec or so.
This was taken using a 3 stage limiter and a 1 sec counter gate
Hi all,
This is for those asking about the Ocean Optics Optical Spectrometers. The
guy who sells them is:
Roland Guilmet rolandguil...@yahoo.com
I've sent him the emails of those who expressed an interest to me
off-list. Please deal directly with him.
Best,
-John
=
Bob Camp wrote:
On Feb 2, 2010, at 9:57 PM, Bruce Griffiths wrote:
Joseph M Gwinn wrote:
Figure 8 (attached) from Collin's paper indicates that the jitter of a 100Hz
wien bridge oscillator is of the order of a few hundred nanosec or so.
This was taken using a 3 stage
Mine worked great for about two weeks, but now BITE goes high again after about
45 minutes. It's quite stable when it's locked. Haven't had a chance to look
closer yet.
Dave
- Original Message -
From: Jim j...@commo.com
To: time-nuts@febo.com
Sent: Tuesday, February 2, 2010 2:08:06
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