> The late John Branegan, GM4IHJ (CDR, Royal Navy)
> did a lot of good research on Mode K using the RS birds.
> ... an effective way of... satellite DX despite today's low orbits.
Thanks! Ill research it. The over the horizon DX aspect is what everyone
And that is what I want to study. My theory is that with the variability
of the ionosphere, that just as much as there is enhanced
beyond-the-horizon relay some times, there is also times of no-path
because the ionosphere at low elevations is bending the path away from the
My theory is that hams like DX and remember the GOOD DX, but then
conveniently forget all the times when the link was dead. So I think
what I hear from "the good ole days" has to be taken with a grain of salt
since the dead band days are not as memorable as that rare double bounce
hop to timbuktoo.
So far, no one has described how often they could not even hear the bird
or get into it even though it was in range. I think that is the data that
HFSAT in 2018?
In several attempts I have yet to hear myself on the AO-85 downlink.
finally, after playing with SatPC32 this evening I realized it tells me
pretty well exactly where I should be. I ran through an upcoming pass
to see what it tells me and the result is tabulated in the following
table. First column is time (UTC), second column is the fine freq to 4
decimals and the third column are frequencies I can actually enter in my
TH-D72 with its 5 kHz frequency step. 435.170 at AOS confirms what many
ops have told me in the last few days. What I forgot was how fast the
frequency changes as AO-85 passes through its maximum elevation; the
middle 3 minutes will be busy!
Anyway, I was pleased to "discover" this and hope the information will
give me what I need to finally make a QSO or two. Now I just hope I
don't get rained out!
Newbie here and I am trying to put together a station. I have a question about preamps. I am making the following assumptions but please correct me or outline your station feeds if I am incorrect in my assumptions:
Most experienced operators are using moderate to high gain yagi antennas, circular polarized. I am thinking of purchasing the M2 LEO pack. I am assuming that most folks are using RF protected preamps to keep from blowing them up on transmit. It would be easier if one knew that they were always going to transmit on 2 meters (for instance) and one could place the NON RF protected preamp on 70 cms. However, since there is a mix of V/U and U/V birds, it would seem the only way to get preamps up at the antenna where they belong is to use RF protected preamps ( with weather and RF protection, significantly more expensive). Is there a role for diplexers here rather than running expensive RF protected switching? Also, I know from my listening on my Elk Antenna that change in polarization can make a pretty significant difference in adequate reception. So, it would also seem that there is a need with these type of antennas (M2 LEO) to have a polarization switching (cost for both antennas almost matches the original cost of the antennas). Do most operators have these switchable polarization switches. My shack is about 60 feet from the top of the roof, so I will have to deal with those losses in spite of using good cable. I was thinking of just starting with the antennas (no preamps, no polarization switching) and see how things go. Any thoughts or advice would be much appreciated.
Fred Castello, KF4FC
ARISS will have a presence at the Escape Velocity 2016 event at the
Gaylord National Resort & Convention Center in National Harbor, MD
this weekend. To demonstrate space communications to anyone
interested, I will work two FO-29 passes tomorrow afternoon (at 16:49
UTC and 18:36 UTC) from outside the convention center using the AMSAT
club callsign W3ZM. Please look for me around 435.865 MHz +/- Doppler.
I may also work the SO-50 pass at 19:54 UTC.
Here is a quick AO-16 update. On Sunday I turned AO-16 long enough to
get some telemetry packets. The satellite would remain on for less
than one minute after being commanded on. A quick test of the "bent
pipe" voice mode repeater was successful. . The "hardware watchdog
timer problem" is still evident; as expected, spacecraft temperatures
are insufficient to keep the transmitter ON (needs to be above 15 deg
Orbit projections suggest that satellite illumination conditions will
not result in increased temperatures for nearly 10 years. Command
stations do periodically turn AO-16 "ON" to check on its condition and
see if the hardware timer problem has "automagically" fixed itself
(which in not anticipated, but who knows...).
3 Oct 2010 1838 utc
PACSAT MBL Telemetry Decoder Ver. 1.3 (c) Mike Rupprecht, DK3WN
+10V Battery Bus : 0.00 V
Battery Charge Reg : 0.55 mA
Base Temp : 9.07 °C
PSK RF Out : 1.90 W
+5V RX Bus : 4.87 V
+8.5V RX Bus : 8.49 V
+10V RX Bus : 11.24 V
Here is another teaser :) Several months ago I commanded the AO-16
S-band transmitter ON; it too remains functional (albeit weak), and
was received by me, Drew KO4MA, and Alan WA4SCA.
Mark L. Hammond [N8MH]
Just to let you know that I have just changed AO-73/FUNcube into full time amateur mode. Enjoy the transponder over the weekend.
Plan as normal is to return the sat to auto switching mode on Sunday pm, utc
73 Jim G3WGM
Wonder if anyone has taken a shot at trying to see if AO-40 could be
activated or even heard. Whether anyone may have heard its local
oscillators? Stranger things have happened (AO-07 for one).
Also, does anyone know when or if AO-16 can be activated again in its
basic boot loader as it was some time ago. Its communications in the
mode (FM/DSB/AM) worked really great. However, I believe there was a
time issue due to sun angles. Wondering if we are getting close to that
time frame again?