That is why I want so much to continue the 145.825 digipeater on as many
satellites as we can*.
But we can’t seem to inspire any of the other HUNDREDS of satellite
building groups to consider it.
I think there were over 100 cubesats launched last year. None with 145.825
*(and convince the leave-it-on-24/7/365-not-moving user satellite stations
to stop beaconing unattended!)
*Subject:* RE: [aprsisce] North America M0XER-4
Too bad we can't get the balloon to switch to the ISS frequency and use the
digi off of it when over the oceans and arctic!
-------- Original message --------
On Thu, Jul 31, 2014 at 12:23 PM, 'Steve' wrote:
> Seems the balloon enjoyed itself so much it’s going round again.
> Congratulations are in order to Leo M0XER
> AFAIK this has never been done before.
> Be interesting to see if it makes it twice
We're a tough crowd to please...
First circumnavigation of the globe by an amateur radio carrying
balloon, and as it passes the milestone...
"So, can you get another lap out of it?"
What about poor old M0XER-3? It's still out there! Sure it got waylaid
in Nunavut for a while, and let M0XER-4 slip on by... It needs some
[ see present track: http://aprs.fi/M0XER* (and click for 7 day tail)]
If the winds are playing nice, and the fates allow, it should be
coming into range fairly soon.
Actually, using simple pass-times, it is possible to predict with a simple
pencil, all future pass times for several weeks.
Every satelite REPEATs their daily ground track every few days or so.
AO51 repeated every 5 days, and GO32 every 9. These were sun synchronous
and so not only the ground track repeated but the time of the passes
repeated as well.
See the examples on: http://aprs.org/MobileLEOtracking.html
The ISS is not sun synchronous, but these three rules will predict future
ISS passes without any stinkin-confusor:
1) If you hear one pass, 5 out of 7 times, the next one is about 90
2) The ISS REPEATS the same ground track every other day but 51 minutes
3) For a given day, the same pass the next day is 23 minutes later.
This makes portable APRS operations in the wilderness easy. All you need
is ONE PASS time, and you can infer all the others for weeks using the
simple rules, and just keepin notes on pass TIMES when heard.
You don't need no-stinkin-computer. Satellites are in "orbit" and
Just take your favorite satellite, print out a week of passes, and then
look for the "RULE" that will predict future passes. Then all you need to
remember, is the RULE.
From: amsat-bb-bounces(a)amsat.org [mailto:[email protected]] On
Behalf Of EMike McCardel
Sent: Friday, August 01, 2014 1:40 PM
To: Glen Gardner
Subject: Re: [amsat-bb] Equatorial Crossing Data (EQX)
Glen, Paul and Joseph,
Thank you for your replies. I am learning a lot here. My imagination has
been captured by learning to use the Satellabe and OscarLocator prepping
for my presentation on tracking satellites at the AMSAT Training Day
during the ARRL Centennial. I also discovered a construct involving a
globe offering a 3D rendition of of a pass. This is an interesting way to
demonstrate how the earth moves independent of the orbit. I can't help but
think that some of the analogue tools of the day still have relevancy.
EMike McCardel, KC8YLD
VP for Educational Relations AMSAT-NA
Sent from my iPhone
> On Aug 1, 2014, at 11:53 AM, Glen Gardner <glen.gardner(a)verizon.net>
> You can easily find the times for equatorial crossing for ascending
passes from the element set.
> Consider Oscar 7
> Satellite: AO-07
> Catalog number: 07530
> Epoch time: 14211.80120610
> Element set: 27
> Inclination: 101.4754 deg
> RA of node: 192.2023 deg
> Eccentricity: 0.0011666
> Arg of perigee: 207.8798 deg
> Mean anomaly: 270.9717 deg
> Mean motion: 12.53605918 rev/day
> Decay rate: -2.2e-07 rev/day^2
> Epoch rev: 81698
> Checksum: 281
> The epoch time is the reference time for that element set. It also
happens to be the time for the ascending node (equatorial crossing
> In this case it is "14211.80120610" which comes out to the year 2014,
day 211 and the hour comes out to 19.22 hours.. or approximately 19 hours,
13 minutes, 44 seconds.
> Ignoring the decay rate, the next ascending node will be in one orbital
period. You can get this by dividing the number of minutes in a day by the
mean motion: 1440/12.53605918=114.869 minutes after the epoch time.
> Getting the descending node is more problematic if the orbit is highly
eccentric. In the case of Oscar 7, the eccentricity is small, and it is
close enough to a circular orbit that it is reasonable to assert that the
descending crossing of the equator is very close to 1/2 orbital period
after the ascending node (unless your TLE's are more than a few days old).
>> On 08/01/2014 03:07 AM, Paul Stoetzer wrote:
>> i8CVS posted the directions to calculate EQX and everything else
>> needed to use an OSCARLATOR from Keplerian elements back in 2003.
>> I haven't done any programming in forever, but maybe I'll try to
>> write a short program to automate those calculations at some point
>> (unless someone already has).
>> Paul, N8HM
>>> On Thu, Jul 31, 2014 at 10:51 PM, EMike McCardel <mccardelm(a)gmail.com>
>>> Does anyone know of a tracking application or program or some other
software or existing source that will still produces or publishes
equatorial crossing data for current satellites?
>>> EMike McCardel, KC8YLD
>>> VP for Educational Relations AMSAT-NA
>>> Sent from my iPhone
>>> Sent via AMSAT-BB(a)amsat.org. Opinions expressed are those of the
>>> Not an AMSAT-NA member? Join now to support the amateur satellite
>>> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
>> Sent via AMSAT-BB(a)amsat.org. Opinions expressed are those of the
>> Not an AMSAT-NA member? Join now to support the amateur satellite
>> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
> Sent via AMSAT-BB(a)amsat.org. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
Sent via AMSAT-BB(a)amsat.org. Opinions expressed are those of the author.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
I am trying to set up SatPC32 ver 12.8c "unregistered" with two FT-817s. My
problem is that there is no CAT control on radio 1. Radio 2 works
perfectly. Here is the setup:
Radio 1, com port 2, delay 70 (tried 110 also)
Radio 2, com port 5
Checked Atom. RX/TX change only (no other boxes checked but tried the
As I change from sat to sat, Radio 2 will change freq and be steered but
there is no response from Radio 1
If I remove Radio 2 (unplug the USB cable) and configure only a radio 1,
there is no CAT control of radio 1.
Computer is an HP Mini running Win7
Watching Device Manager, I can unplug either USB cable and see port 2 or
port 5 come and go as I plug and unplug.
I have switched radios then switched the CAT USB cables (they are FTDI).
Still radio 1 does not change.
Leaving the radios plugged in to the same computer, I exited SatPC32 and
started HRD and tested for CAT operation on each radio one at a time and
they both work.
My question: Why no CAT for radio 1? Why no error message? Are there any
other troubleshooting steps I can take?
I have searched just about everywhere on-line and see no one else having
this problem. I have found that many have success with the dual non-duplex
Any help would be appreciated.
Thanks, Larry W7DGP
July 29th-12th,August 2014 working on my trip the following grids:
Only Work on SO-50 SAT (FT-60R 5 watts & Arrow Antenna)
( EL00, DL90,DL91,DL92,DL81,DL82,DL83,DK99 AND DK89 )
All my QSO `s are uploaded to LoTW
all notices from my twitter account @ xe3dx
David Maciel XE3DX
*xe3dx(a)amsat.org <http://mc/[email protected]>*
Does anyone know of a tracking application or program or some other software or existing source that will still produces or publishes equatorial crossing data for current satellites?
EMike McCardel, KC8YLD
VP for Educational Relations AMSAT-NA
Sent from my iPhone