from my limited understanding of things I would have guessed that the
ADF4001/2 PFD's ability to produce very short pulses in the
locked condition
puts a lot of energy into higher harmonics of the PFD's output, making it
more easy for the loop filter to remove them. In contrast to that
the
Concerning my query about what's good enough to count as a contact...
We've done Moonbounce with 3mW (Hobart - Dwingeloo) in JT65 - but a
26m and a 25m dish is stretching 'amateur' a bit again.
Googling for JT65 finds a nice paper:
Sorry, it's already been done I believe.
http://freenet-homepage.de/dl4yhf/speclab/earth_venus_earth.htm
Some years ago, like nearly 20, I helped some friends and built a 224
element broadside colinear aray for EME. It (eventualy) worked realy
well. Echoes could be heard under good conditions
Hal Murray wrote:
Concerning my query about what's good enough to count as a contact...
We've done Moonbounce with 3mW (Hobart - Dwingeloo) in JT65 - but a
26m and a 25m dish is stretching 'amateur' a bit again.
Googling for JT65 finds a nice paper:
mag...@rubidium.dyndns.org said:
Their modulation scheme is 1 of 65 tones. 6 bits per baud.
The extra tone is the synchronizing signal.
6 bits per symbol. 1 baud is 1 symbol per second.
Happy to see someone using baud, just unhappy about seeing it being
used incorrectly.
Thanks for
Hal Murray wrote:
mag...@rubidium.dyndns.org said:
Their modulation scheme is 1 of 65 tones. 6 bits per baud.
The extra tone is the synchronizing signal.
6 bits per symbol. 1 baud is 1 symbol per second.
Happy to see someone using baud, just unhappy about seeing it being
used
Most building insulation foam sold here in UK has an Alu foil cladding on
both sides ...
Dave
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Predrag Dukic wrote:
How well depleted it really is?
DU has about 1/3 the U235 of natural U, of which less than 1% is U235.
All the isotopes are radioactive, but I don't recall what the relative
activities are. I think U238 has a half live of 4E9 years or more, so
not very many atoms
Hi Bob:
How about just wrapping the aluminum block in aluminum foil with the
shiny side out. Then wrap the Styrofoam cube with the shiny side in
before putting it in the aluminum box?
Have Fun,
Brooke Clarke
http://www.PRC68.com
Bob Camp wrote:
Hi
Since styrofoam is being rated as a
Hi John,
Thank You for taking the time, I am relatively New at this and would like to
knows if I am interpreting the reading correctly.
Best regards,
Sal C. Cornacchia
Electronic RF Microwave Engineer (Ret.)
From: John Miles jmi...@pop.net
To:
Hi
Sounds cheaper than gold plating.
I'd put a couple layers of foil in the 8 of foam as well. Maybe a layer
every 2.
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Brooke Clarke
Sent: Thursday, March 11, 2010 9:48 AM
To:
It is entirely possible that a 10544 could have excellent aging and beat
a 10811. The SC cut doesn't improve aging. The other disadvantages
of the 10544 in terms of electronics also don't affect aging. The
main advantage of the 10811 is that it is much better from a cold start
in an
Hi
A couple of possibilities:
The 10544 has a bigger lump of quartz (BT is thicker) in it = good for
aging.
The 10544 could have been on power a lot longer = good for aging.
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of
Hi
Also true here in the US, but not for Styrofoam.
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of David C. Partridge
Sent: Thursday, March 11, 2010 8:53 AM
To: 'Discussion of precise time and frequency measurement'
Subject: Re:
I think the Dutch have done EVE; seems something passed by on Moon-Net in
the past year...
Don
Dave Baxter
Sorry, it's already been done I believe.
http://freenet-homepage.de/dl4yhf/speclab/earth_venus_earth.htm
Some years ago, like nearly 20, I helped some friends and built a 224
element
At 20.33 11/03/2010, you wrote:
I think the Dutch have done EVE; seems something passed by on Moon-Net in
the past year...
Don
AMSAT DL, one year ago, using 6kW CW (injection locked magnetron) on
13 cm and a big parabolic reflector. See
http://www.arrl.org/news/stories/2009/03/31/10738/?nc=1
Hi,
In order to avoid a dead zone in a phase detector there is a current
pulse in both the up and the down source. The net result when locked
is zero but the noise is still there. Therefor the moved charge in
lock should be as low as possible. The up and down currents must be as
short as
Thats only true when the current source noise dominates.
When switching jitter on the pulse eges dominates the pulse width has no
effect (to first order) on the noise.
Since the supply rails are relatively noisy in an FPGA the current
source noise will usually dominate in a CMOS XOR
Hi
If you are running a synthesizer with a 1 KHz reference frequency and trying to
use a 900 MHz VCO for the output, reference spurs are going to be a major
issue.
If you are going straight from 10 MHz to 100 MHz with a crystal oscillator at
100 MHz, reference spurs should not be a
Hi
The OCXO in the 5370B is a 10811-60111. The only added spec on it is a 1x10^-11
ADEV spec at 1 second. By modern standards that's not a real tight spec. There
are other 10811's with tighter specs on them at 1 second. My guess is that it
was not a real tight spec for the 10811 to hit.
The
Many if not most 5370-based measurements are based on differential timing
between the START and STOP channels, and wouldn't benefit from a better 10
MHz reference. If a customer did need something better, they probably
already had a house standard to pipe in the back... and if not, HP would
have
Jack Smith at Clifton Laboratories built a replacement for the 1502
chart recorders. An early prototype can be seen here:
http://www.cliftonlaboratories.com/mar_2007.htm
On Thu, 11 Mar 2010 04:51:00 +, Mark Sims hol...@hotmail.com
wrote:
Gawd, tell me about it... I just got through
Hello,
I'm looking for a decent outdoor antenna for my Thunderbolt... I need to
graduate beyond the puck-antenna in the window sill.
Any recommendations and/or sources (the lower cost, the better of course!)?
Thanks,
Dave
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It doesn't get any better than Ebay item 270262189976... I've tested a couple
dozen antennas and nothing comes close to what it does... It's big. It's
pricey (but FAR less than the $2000+ original cost). It's good.
---
I'm looking for a decent outdoor antenna for my Thunderbolt...
That's the 1502/1503 chart recorder that uses a hot stylus and paper roll with
a punched timing track. Paper is available at $25-$36 a roll (min purchase 10
rolls). I have a mod that lets you use $1-$2 a roll ECG paper.
The 1502B/1503B/1502C/1503C are a different animal. Their chart
Hello, folks. I have a Giga-tronics 20408AL signal generator for sale. It does
10MHz - 8GHz. I believe it to be new and uninstalled. It is in immaculate
physical condition. It was originally sold in 2007 and has a factory cal
sticker from May 17, 2007. It is packed in the factory box with
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