[amsat-bb] Getting Ready for RadFxSat (Fox-1B)
From: Paul Stoetzer, N8HM
Date: Fri Nov 3 23:53:22 UTC 2017
RadFxSat (Fox-1B) is scheduled for launch on November 10, 2017.
RadFxSat is one of four CubeSats making up the NASA ELaNa XIV mission,
riding as secondary payloads aboard the Joint Polar Satellite System
(JPSS)-1 mission. JPSS-1 will launch on a Delta II from Vandenberg Air
Force Base, California.
RadFxSat is a partnership with Vanderbilt University ISDE and hosts
four payloads for the study of radiation effects on commercial off the
shelf components. RadFxSat features the Fox-1 style FM U/v repeater
with an uplink on 435.250 MHz (67.0 Hz CTCSS) and a downlink on
145.960 MHz. Satellite and experiment telemetry will be downlinked via
the "DUV" subaudible telemetry stream and can be decoded with the
LAUNCH AND EARLY ORBIT PHASE (LEOP)
RadFxSat will launch at 01:47 PST (09:47 UTC) on November 10, 2017
from Vandenberg Air Force Base, California. At this time, pre-launch
Keplerian elements are not expected to be available. However, based on
the Local Time of the Ascending Node (LTAN) of the primary payload,
13:30, stations should expect to have their initial ascending passes
starting around noon local time. The estimated time of "First
Veronica," the initial beacon after deployment, is 12:07 UTC. Due to
the tight constraints on the primary payload deployment, the secondary
payloads may be delayed slightly, so this should be considered the
soonest the transmitter will be enabled. Orbital elements will be
published as soon as they are available on the AMSAT website. Stations
in Europe, South America, and North America should point your beams
south and have FoxTelem running while awaiting the initial post-launch
Participation in telemetry collection by as many stations in as many
parts of the world as possible is essential as AMSAT Engineering looks
for successful startup and indications of the general health and
function of the satellite as it begins to acclimate to space.
If you are capturing telemetry with FoxTelem please be sure that
"Upload to Server" is checked in your settings, and that your "Ground
Station Params" are filled in as well. You can help AMSAT and everyone
waiting to get on the air with RadFxSat tremendously by capturing
About 60 minutes after deployment, or 140 minutes after launch, the
satellite will start up in Beacon Mode. In this initial mode, the
transmitter is limited to 10 seconds on time and then will be off for
two minutes. For those of you capturing telemetry, that means that you
will only see Current frames and no High or Low frames. The High and
Low frames are truncated as it takes just over the 10 second limit to
send two frames. Veronica may also be cut off before she gets to say
her whole ID string as the full ID, "RadFxSat Fox-1B Safe Mode," is a
bit longer than the approximately 3.5 seconds she has in Beacon Mode.
If the voice ID is cut off, the satellite is still in Beacon Mode.
If AMSAT Engineering is seeing nominal values from the telemetry you
gather, the satellite will be commanded from Beacon Mode to Safe Mode
on the first good pass over the United States. In Safe Mode, the
satellite transmits a full two frames of telemetry (one Current frame
followed by, and alternating each ID cycle, a High or a Low frame).
Veronica now has time to make the whole ID announcement in Safe Mode.
The on-orbit checkout procedure for RadFxSat is similar to
Fox-1A/AO-85 and could be completed in as little as a few days if
users cooperate. It is very important, and good amateur operating
practice, to refrain from using the transponder uplink so the on-orbit
tests can be performed, including when the satellite is switched into
Transponder Mode for testing.
AMSAT will make it broadly known when the tests are complete and the
transponder is available for all to use. If you hear someone on the
transponder, please do not assume that it is open for general use -
check AMSAT's website, Facebook, and Twitter before transmitting to be
sure you do not interfere with testing.
AMSAT asks all satellite operators to contribute just a little bit of
your time by gathering telemetry, not using the transponder uplink, to
help complete the last few days of getting RadFxSat operating for the
amateur radio community.
Lots of hams put thousands of volunteer hours of their time into
making RadFxSat happen. Just like any ham radio project you might
undertake, AMSAT builds satellites. AMSAT volunteers do it because
they like to, and when they are done, AMSAT freely shares their
project with hams everywhere as is the spirit of amateur radio.
Thank you very much and see you on the bird!
RADIO PROGRAMMING CHART
RadFxSat (Fox-1B) Doppler Shift Correction
Memory 1 (AOS) - Transmit 435.240 MHz (67.0 Hz Tone), Receive 145.960 MHz
Memory 2 (Approaching) - Transmit 435.245 MHz (67.0 Hz Tone), Receive 145.960 MHz
Memory 3 (TCA) - Transmit 435.250 MHz (67.0 Hz Tone), Receive 145.960 MHz
Memory 4 (Departing) - Transmit 435.255 MHz (67.0 Hz Tone), Receive 145.960 MHz
Memory 5 (LOS) - Transmit 435.260 MHz (67.0 Hz Tone), Receive 145.960 MHz
Frequencies are subject to change post-launch.
SPECIAL MEMBERSHIP OFFER
As part of the preparations for the launch of RadFxSat, AMSAT is
making the "Getting Started With Amateur Satellites" book available
for a limited time as a download with any paid new or renewal
membership purchased via the AMSAT Store. This offer is only available
with purchases completed online, and for only a limited time. A
perennial favorite, Getting Started is updated every year with the
latest amateur satellite information, and is the premier primer of
satellite operation. The 182 page book is presented in PDF format, in
full color, and covers all aspects of making your first contacts on a
ham radio satellite.
Please take advantage of this offer today by visiting the AMSAT store
at https://www.amsat.org/shop/ and selecting any membership option.
While there, check out AMSAT's other items, including the M2 LEOpack
antenna system, Arrow antennas, AMSAT shirts, and other swag. Be sure
to view your cart before going to checkout. If you add a membership
and then go directly to checkout, you'll never see an option to add
your free gift.