http://www.electronicsweekly.com/Articles/28/09/2012/54676/raspberry-pi-gets
-a-competitor.htm
Rob K
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On 1/21/2013 10:26, Rob Kimberley wrote:
http://www.electronicsweekly.com/Articles/28/09/2012/54676/raspberry-pi-gets
-a-competitor.htm
Olimex is also making an A10 board with sound industrial design, to be
available in the near future. The advantage here for time-nuts is that
the A10
It is hard to say which Arm is best for time nuts. The Cortex-A8 is what the
Beagleboard XM uses. That CPU has neon, which is Arm's version of MMX. That
is, not fully kosher floating point, but fast parallel processing good enough
for DSP. The Raspberry Pie uses a fancier GPU and a simpler CPU
Hi
Freescale has had K60 modules out for several years now. No usb ethernet and
they do have 1588 built in. Depending on just when and where you catch them
they can be pretty pricy or about half that...
Bob
On Jan 21, 2013, at 10:54 AM, li...@lazygranch.com wrote:
It is hard to say which
Greetings:
I'm contemplating upgrading my GPS antenna. Does anyone have any suggestions
for an antenna that would be significantly better than a Symmetricom 58532A for
typical time nuts applications. (As a side note if I upgrade the antenna I
will also upgrade the feed line to LMR style
Would anyone happen to have a LHCP patch antenna, with or without preamp,
they would be willing to sell? I want to use it as the feed for a 4 foot
diameter F: 0.375 dish antenna for a dedicated WAAS receiving set up.
Thanks,
John Franke WA4WDL
4500 Ibis Ct.
Portsmouth, VA 23703
On 1/21/13 9:14 AM, jmfranke wrote:
Would anyone happen to have a LHCP patch antenna, with or without
preamp, they would be willing to sell? I want to use it as the feed for
a 4 foot diameter F: 0.375 dish antenna for a dedicated WAAS receiving
set up.
why a patch? Patches are nice when
It is all a matter of time versus money. There are community projects
for the Panda, Beagleboard XM, and Raspberry Pie. People you can bug. If
you get really serious on these SBCs, it would pay to learn the
cross-compilation techniques. Some of the distributions uses an arm
emulator (i.e. run
li...@lazygranch.com said:
Regarding that competition board, two USBs is cutting it close. I've been
using my KVM, so keyboard and mouse take one port. The RTL device is
another port. I suppose you can always add a hub if bandwidth isn't an
issue.
I normally use ssh so I don't need the
Mark wrote:
Does anyone have any suggestions for an antenna that would be
significantly better than a Symmetricom 58532A for typical time nuts
applications. Immunity to other transmitters is also a
consideration for me, and this may push me towards staying with the 58532A.
I use an
I'd say that if you have some extra money to spend, first spend it of
improving the antenna's location. Unless it already is on top of a tall
mast with a clear view of the horizon and far from any radio reflectors.
The Heliax will only do good if the length of the run is long.
Another good use
albertson.ch...@gmail.com said:
The Heliax will only do good if the length of the run is long.
I don't understand that. What does the type of antenna have to do with the
length of the run?
Do Heliax antennas have a couple of dB gain over other antennas? I can fix
attenuation in coax with
Hal Murray wrote:
albertson.ch...@gmail.com said:
The Heliax will only do good if the length of the run is long.
I don't understand that. What does the type of antenna have to do with the
length of the run?
Do Heliax antennas have a couple of dB gain over other antennas? I can
Heliax is a type/brand of coax not an antenna.
Ahh. Thanks. Everything makes sense now.
I was thinking of Helix from Jim's recent comments rather than Heliax.
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On Mon, Jan 21, 2013 at 6:59 PM, Hal Murray hmur...@megapathdsl.net wrote:
albertson.ch...@gmail.com said:
The Heliax will only do good if the length of the run is long.
I don't understand that. What does the type of antenna have to do with the
length of the run?
You are confusing
There was a thread on RF absorbing material a few months ago to get rid of
reflections.. That might be a way to spend spme money. I'd like to see before
and after results.
-Original Message-
From: Chris Albertson albertson.ch...@gmail.com
Sender: time-nuts-boun...@febo.com
Date: Mon, 21
It is possible that the noise figure of the preamp is better than that of the
gps. This is especially true if the GPS predates SiGe parts being common place.
I never ran any heliax, but isn't the idea also that it will last longer than
coax.
-Original Message-
From: Chris Albertson
On Mon, Jan 21, 2013 at 8:23 PM, li...@lazygranch.com wrote:
There was a thread on RF absorbing material a few months ago to get rid of
reflections.. That might be a way to spend spme money. I'd like to see
before and after results.
If you have a very good location for the antenna then RF
Thanks all for the comments and suggestions.
Re my contemplated cable choice, my interest in using Heliax is primarily
driven by shielding and to a lesser extent phase stability considerations. (I
also happen to have some 1/2 Heliax and LMR400 on hand.) I'm currently using
approx 70 feet of
RG-6 used for satellite TV has much lower loss than RG-58,
and is much cheaper and easier to work with than Heliax or LMR400.
On 01/21/2013 10:27 PM, Mark Spencer wrote:
Thanks all for the comments and suggestions.
Re my contemplated cable choice, my interest in using Heliax is primarily
Mark,
Phase stable cables won't win you much benefit. You can't go past quad
shielded RG-6 for bangs-per-buck. It's available almost everywhere, cheap
and pretty low loss as 0.25 cables go. LMR-400 (etc) is a good
alternative.
Kit
VK1LL
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Re my contemplated cable choice, my interest in
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