On Mon, 8 Feb 2010 04:11:55 pm Edward Cole wrote:
Thank you Ed and David for your detailed replies.
I knew that the S meter under read but I was unsure of by how much.
A beacon or a repeater would make a good signal source. Unfortunately, the
nearest UHF repeater is around 1000 Km from here an
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>Minor clarification, Loran-A was used from WW-2 until it was turned
>off in the 1980's I believe. The current system, Loran-C was in
>commercial use starting in the late 70's. When Loran-C was used for
>returning to a previously stored waypoint, it's accuracy was almost
>as good as current G
Hi Ed,
Regarding power used:
I was running 25w (minus a few dB of coax losses) into an 8 element beam
(vertically polarized), and getting an S5 return on a 2x15 circular beam, with
a mediocre preamp. I forget if it was RHCP or LHCP on the downlink at the time.
I don't have a power meter, but
Another observation from DO33 (yo Bernhardt), I've always had trouble
hearing this bird well enough to work from my home station, as I have my
antennas at fixed elevation, and manually-rotated via channelmaster... AO-51
has been consistently easier to hear AFTER it has passed overhead on
a
Minor clarification, Loran-A was used from WW-2 until it was turned off in the
1980's I believe. The current system, Loran-C was in commercial use starting in
the late 70's. When Loran-C was used for returning to a previously stored
waypoint, it's accuracy was almost as good as current GPS and
Yes, I agree with that, Clint. I have been looking at Jerry Brown's, K5OE,
archived pages available here:
http://web.archive.org/web/2824013151/http://members.aol.com/k5oe/
After looking at it, I think I like the radiation patterns of the TPM II's
better than any other LEO antenna I've seen
On 2010-02-09 10:52 , tosca...@umn.edu wrote:
> Does the US government NOT have any plans to launch any more GPS satellites?
There will be more but of somewhat different design with better
capabilities for terrestrial use. (Although potentially worse signals
*above* the constellation, which is a
Aloha All
In general, Hawaii is a very quiet place.
Most passes of AO-51 fly by with no usage.
Accordingly, signal strength and quality are
usually quite discernable (assuming no
anomalous QRM) when QSOs do occur.
The initial reorientation of AO-51 was very
apparent here. In general, the bir
Have anyboy worked with this 55 elements loop antena for 1.2 GHz.
What about its mechanical and electric features?
Juan Antonio
EA4CYQ
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One more update:
I tried pass #744, this morning and copied a big round-table of
several west-coast stations, but was unable to break in. My downlink
was as loud as them, so...? I had one call to my CQ right at LOS and
could not complete, sorry! Bear with me as I am getting reaquainted
with
Also, would like to thank John for recording and posting downlink audio files.
They're not only useful in evaluating signal quality, they're fun to listen to
when I can't be in the shack!
Funny to hear myself mangle the call of the last station--still half-asleep--hi
hi.
Didn't hear you at al
I do not know the exact answer, but the Iridium satellites
(constellation of 256?) each were supposed to cost $5M/each.
But any of you who actually have used Loran-C, know that is a far cry
from the accuracy or reliability (due to LF propagation) as GPS.
Ed
PS: I used to install them, but you co
You are on-the-nose John.
Currently, I AOS and LOS AO-51 at higher elevations than before the initial
flip. During high passes, the downlink is no longer DFQ or is as strong as
before, and there are more fades (was better with leaves still on the trees!).
I have questioned my antenna calibrati
At 05:23 AM 2/9/2010, Bill Dzurilla wrote:
>Dave,
>
>I would be suspicious of the construction. I can get a few minutes
>of good copy from AO-51 on a high pass with just a rubber duck on an
>HT. If you do get a preamp, the run between the antenna and the
>preamp is critical, so if possible kee
Thanks for the reports.
Again, I encourage you all to research the power levels OUT at the
comparison times. That has to at least be considered in the
discussion.
For example:
Power is "watts" out
Date 435.150 435.300 Battery V
Before flips
2009-02-09 19:
--- On Tue, 2/9/10, John Papay wrote:
> From: John Papay
> Subject: [amsat-bb] AO-51 Signal Strength Post Flip
> To: amsat-bb@amsat.org
> Received: Tuesday, February 9, 2010, 8:47 AM
> It has been about a month now
> since AO-51 was commanded back to
> its normal orientation. But many are r
On Tue, 2010-02-09 at 09:52 -0600, tosca...@umn.edu wrote:
> Does the US government NOT have any plans to launch any more GPS satellites?
Nope.
Keep cheering on the Iranians and their space-flight programme. They'll
be the only game in town ten years from now, if things keep on like
this.
You m
By the way, John--a handy place to spot check power levels at various
dates is here:
http://www.amsat.dk/oz7sat/tlm/view.php?sat=ao51 Just put in the
dates you want to see.
And the full telemetry archive is on the AMSAT FTP server, so folks
can grab, decode, and and analyze anything they want,
Hi John,
Have you looked to see what power levels we were running at the
comparision times? Maybe that's part of it...
The orientation should be "back to the way it was" before the flip
experiments. What might be differnet is power budget and therefore
signal strength.
Anyhow, it's good to ask
I can consistently copy the beacons on FO 29 and HO 68 down to the horizion
using a larsen 2/70 mobile antenna with the larsen radial kit. The feed line
is approx 60 feet of Belden 9913F. I typically connect the antenna to a
comet duplexer to my mirage UHF amplifer which has a gasfet preamp
Does the US government NOT have any plans to launch any more GPS satellites?
Does the existing array of satellites in orbit have any which are not in
active use, i.e. reserved for future use as backups? As I recall, each
satellite has two different atomic standards on board, one is on and the
o
It has been about a month now since AO-51 was commanded back to
its normal orientation. But many are reporting that they are having more
trouble hearing it now than they did before the first re-orientation.
It does seem to me that some stations that usually hear very well are not
hearing that we
In our aging fleet of GPS Satellites, which are on the brink of dying, and no
replacements in sight, wonder what will happen then?? Everyone dont throw away
your compass and paper maps. $190 mill is a small price to pay for something
that will work, compared to what other $$ the govt throws away
Dave,
I would be suspicious of the construction. I can get a few minutes of good
copy from AO-51 on a high pass with just a rubber duck on an HT. If you do get
a preamp, the run between the antenna and the preamp is critical, so if
possible keep it short and use good coax. Ed seems to be hav
In a series of small ceremonies, the U.S. Coast Guard on Monday shut down
Loran-C, a navigation and timing system that has guided mariners and aviators
since World War II.
The death blow came last May when President Obama called the system obsolete,
saying it is no longer needed in an age in w
Hi,
Many thanks to everyone who replied to my request for information.
I thought that SatPC32 might offer a solution with the rotator set up
for 450/90 operation.
AFAIK my tracking program (SatExplorer) offers an option to flip the
elevation, to avoid traversing round the end-stop, but I didn't
>> ... (Alaska ... a little inclement weather) ... The preamp makes the UHF
>> Lindy work nearly equal with the high-price stuff...and much simpler ...
I obviously didn't take your inclement weather conditions into account!
A little spoiled down here in Southern California when it comes to weat
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