John,
The December 1974 issue of the AMSAT Newsletter covered AO-7 telemetry fairly
in depth. Included was a description on reading the telemetry followed by a
telemetry conversion table.
You can find the issue in Phil Karn's archive
http://www.ka9q.net/AMSAT-Newsletter-1974.pdf
The article begi
It is very rare to hear clear CW from the AO-7B
telemetry beacon around 145.972. Most of the time
there is no beacon at all. Sometimes there is
jibberish. Usually the signal is very weak.
With AO-7 going through eclipse on every orbit, the
satellite can come out of eclipse in different modes/
Bob W7RLD wrote:
Through general consensus would it be possible to establish a unofficial
"DX watering hole"...Essentially, use a given frequency (downlink) only
when the satellite is less than 4-5 degrees.
Wayne replies:
I don't understand. Every satellite is always less than 4 degrees
el
Through general consensus would it be possible to establish a unofficial "DX
watering hole". Time is the essential limiting factor when attempting DX
contacts on AO-7, or at times on FO-29. Elevating angles are usually less than
4 degrees. My QTH (near Seattle, Wa. CN87) has a ever so small oppo
Down here in Australia at times we have experienced it were AO-7 would change
modes mid pass during a non eclipse period. This was not due to to many
stations but just the 24 hour time kicking in. You could follow the 24 hour
period on http://oscar.dcarr.org.
We use to take betts on who would b
Well said.
73, Bob KIØG
> On Jun 13, 2014, at 4:04 PM, "Andrew Glasbrenner"
> wrote:
>
> I have a theory, and it's just a theory based on my time managing AO-51, and
>
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Not
- Original Message -
From: "Glenn Miller - AA5PK"
To: "Bob- W7LRD" , amsat-bb@amsat.org
Sent: Friday, June 13, 2014 3:47:32 PM
Subject: Re: [amsat-bb] AO-7
Bob,
Some QRO CW station was hammering the transponder, forcing the mode change.
Glenn AA5PK
-
Drew KO4MA
-Original Message-
From: amsat-bb-boun...@amsat.org [mailto:amsat-bb-boun...@amsat.org] On
Behalf Of Bob- W7LRD
Sent: Friday, June 13, 2014 6:40 PM
To: amsat-bb@amsat.org
Subject: [amsat-bb] AO-7
At 2231Z AO-7 downlink quit. In full sun, any ideas?
73 Bob
Bob,
Some QRO CW station was hammering the transponder, forcing the mode change.
Glenn AA5PK
-Original Message-
From: Bob- W7LRD
Sent: Friday, June 13, 2014 5:39 PM
To: amsat-bb@amsat.org
Subject: [amsat-bb] AO-7
At 2231Z AO-7 downlink quit. In full sun, any ideas?
73 Bob W7LRD
At 2231Z AO-7 downlink quit. In full sun, any ideas?
73 Bob W7LRD
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Always check here:
http://oscar.dcarr.org/
It looks like it's been in good shape today based on the satellite
status page and log comments: http://aar29.free.fr/sat/ao7/ao7log.php
Of course, it can't be guaranteed that it'll stay in Mode B on each pass.
73,
Paul, N8HM
On Sat, Jun 7, 2014 at
What mode is AO 7 in today?
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I find it odd that they did not reply to you in Mode A. Given that the
warnings about excessive power can lead to random mode switching on
AO-7 stretch back 37 years, one can only conclude that they wanted the
satellite to be in Mode A.
73,
Paul, N8HM
On Wed, Jun 4, 2014 at 6:09 PM, Glenn Miller
I was listening to AO-7 in Mode B as it rose at 2153Z.
At 2158Z, AO-7 suddenly switched from Mode B to Mode A.
At the time of the switch, there were two stations using excessive power (badly FMing) on the bird. Not sure if that was a
coincidence or not.
Called CQ on Mode A in both CW and SSB
I have listened several times and never heard the CW beacon, so that's neat.
The channel 6D value shows the telemetry to be nothing more than
gibberish, unfortunately, as that number should be 50 +/- 1.
73,
Paul, N8HM
On Wed, Jun 4, 2014 at 9:24 AM, KERRY LA*DUKE wrote:
> AO-7 seemed to be tra
AO-7 seemed to be transmitting cw telemetry today. I copied the following
around 1300Z Frequency 145.969mhz. Mode B
252 252 252
324 324 324 324
496 496 v 496
568 568 568 568
696 696 696 696
hi hi
180 180 180 180
252 252
trying AO-7 this AM-not on mode B or A?? op trouble??
73 Bob W7LRD
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Sadly, the "alligators" (2 specific violators come to mind...) who need to
hear this admonition are not BB subscribers...
George, KA3HSW
- Original Message -
From: "Paul Stoetzer"
To: "Amsat BB"
Sent: Friday, May 30, 2014 6:14 PM
Subject: Re: [ams
WC7V confirmed to me that AO-7 was in Mode A after the Mode B transponder
shut off.
This likely means that my theory of a power drain causing the satellite to
automatically switch into Mode D is incorrect and this is just a
manifestation of the random mode switching that has been a part of AO-7's
Rick,
It's not you. It's been switching off (or into Mode D) quite often.
Hopefully this is just a temporary condition due to sun angles at this
point in it's orbit.
73,
Paul, N8HM
On Fri, May 30, 2014 at 5:29 PM, Richard Lawn wrote:
> Was just about to enjoy a CW QSO with PV8DX on AO-7 and
Was just about to enjoy a CW QSO with PV8DX on AO-7 and everything
disappeared. Has it been acting up lately or is it me?
Rick
W2JAZ
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F wrote:
>>
>>> Paul
>>> On this pass , finishing 18:43UTC , AO7 works all the time !
>>> 73
>>>
>>> PY5LF
>>> Luciano Fabricio
>>> Curitiba-PR-BR GG54jm
>>> http://www.qrz.com/db/PY5LF
>>>
>>>
gt; Curitiba-PR-BR GG54jm
>> http://www.qrz.com/db/PY5LF
>>
>> -Mensagem original-
>> De: amsat-bb-boun...@amsat.org [mailto:amsat-bb-boun...@amsat.org] Em
>> nome
>> de Paul Stoetzer
>> Enviada em: domingo, 25 de maio de 2014 12:49
>> Para: am
de 2014 12:49
Para: amsat-bb@amsat.org
Assunto: [amsat-bb] AO-7 Recent Behavior
Good morning,
AO-7 seems to be showing some odd behavior. For about three weeks of the
eclipse cycle, it had been operating perfectly in Mode B with strong and
clear signals on each and every pass. However, yesterday it
e 2014 12:49
> Para: amsat-bb@amsat.org
> Assunto: [amsat-bb] AO-7 Recent Behavior
>
> Good morning,
>
> AO-7 seems to be showing some odd behavior. For about three weeks of the
> eclipse cycle, it had been operating perfectly in Mode B with strong and
> clear signals on each and e
Good morning,
AO-7 seems to be showing some odd behavior. For about three weeks of the
eclipse cycle, it had been operating perfectly in Mode B with strong and
clear signals on each and every pass. However, yesterday it was off during
two ascending passes over the United States. It was back in Mod
Five days into it's eclipse season, AO-7 is operating very well.
Strong Mode B signals on the last pass over eastern North America. I
worked PV8DX, N8RO, KV1J (his first AO-7 QSO), and KB1RVT. My 25 watts
ERP was plenty until the satellite started going behind the trees to
the north.
Hope to hear
The Eclipse Cycle has begun for satellite Ao-7.
Typically what this means is that the satellite will lose all power and
by default go into "Start-Up" mode every time it comes back into the
sunlight. Typically Mode B or C are the 1st mode of operations and the
loss of sunlight prevents mode swi
It looks like eclipse season has started for AO-7 as it was reported
to still be in Mode B this morning over Europe and South America.
This means it should be in Mode B daily for the next 16 weeks or so.
Enjoy!
73,
Paul, N8HM
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On the last pass of AO-7, I was trying out various power levels as it
was a nearly overhead pass of a maximum elevation of 81 degrees. With
just 20 degrees of elevation, I heard my downlink at S8 while running
500 mW to my Elk. With about 7 dBd of gain at 432 MHz, I estimate my
EIRP to have been ar
I had a 75 degree pass of AO-7 this afternoon and thought I'd try to
hear the beacon. I've tried a couple of times now and not heard
anything. Maybe my high local noise level prevents me from hearing it,
but I don't have much noise with the antenna pointing almost straight
up.
Does the Mode B beac
I lost track of the "switch over" on AO-7. Trying make a sked with the UK later
in Jan. Happy New year to all my satellite friends. Check out Jan. QST page 20.
73 Bob W7LRD
CN87
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In the spirit of "Use what you have to begin with!", I have had surprising
success with a simple magmount CB whip cut for 10m. It sits in a corner of the
shack on a large metal serving tray "borrowed" from the XYL. I've worked
stations over in Europe with it.
73 Nick KB1RVT
Sent from my iPhon
I was thinking of making the 10m ring and trying that this weekend. (Assuming
AO-7 cooperates) Also what do you think about a 3 elem beam/no boom strung
between two trees pointing towards space? Think that would work ok? How far up
would the reflector have to be off the ground or rather how clos
Does anyone have any success in mode A? If so what type of 10m antenna?
Kevin
KF7MYK
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shortly at 1831Z I will have a foot print to N. Eu. also a part of UK. from
Seattle Wa. CN87. On about 145950 max el. 5*
73 Bob W7LRD
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Very week signal !... on orbit #177000 over Brazil, at 20:20 UTC.
Problem with solar panels ? or illumination ?
QSO with PU2RAS.
73 de Roland PY4ZBZ
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Can someone tell me what type and polarization the antennas are that are
currently in use on the AO-7 satellite?
I've done many searches and cannot find this information anywhere I have
looked.
Thanks and 73,
Ed, K0NW
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Hi all,
Will attempt the AO-7 mode b pass this afternoon. The cavity I brought
really makes operating fun.
See here for some pictures of the RF hell I operate in.
http://www.flickr.com/photos/n3ykf/
The elevated structure in the pics is a an electric railway.
The good news is that I'll be operatin
AO-7 was in Mode A this morning, and will probably be in Mode A again for
SKN on 1 January. With about 100 watts EIRP and a 10m vertical, I had a
respectable 569 signal through the passband.
CU there!
73 Ray W2RS
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Hello from the N.W...I have lost track...when does AO-7 switch modes? I tried
to figure it out from the on line logs, far from specific.
73 Bob W7LRD
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Hello All,
I was quite surprised today to work Neil, ES6DO in Estonia just before 18:00Z
on AO-7 mode B. I was listening to that pass with the hopes of working a few
UK stations I heard a few days ago, and was just about to shut the rig down at
the end of the pass, when I heard a CW station ca
Hello All,
I heard something interesting earlier today while monitoring an AO-7 pass above
my QTH at around 23:30Z. The mode B (U/V) transponder basically went dead, and
I heard a very odd buzzing sound in about the centre of the passband, with no
activity anywhere else in the passband. Not a
the next pass of AO-7 at 1942Z I will be looking for N. Europe. I heard SM3KPX
the last pass, always looking for Mika! On or about 145.957.
73 Bob W7LRD
CN87wk
Seattle, Wa.
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the next pass at 1759Z I will be looking for N. Eu on about 145.957
73 Bob W7LRD
CN87wk Seattle, Wa.
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Anyone who would like to try to establish a new distance record on AO-7 mode B,
get hold of me. I believe the current record is 7766km. The potential distance
is 7907km. I have worked out to 7692km thankyou OH5LK. New satellite
tower/antennas complete. I am located near Seattle Wa...CN87wk and e
I heard OH5LK cqing on AO7 could not find myself quick enough to pounce. He's
not in qrz, anyone know?
work them till they drop
'73 Bob W7LRD
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I was able to hear my downlink on the last pass here, acquiring it a
few minutes before 1600 UTC. The signal was the strongest I've heard
for several weeks and there was no scratchiness or crackling.
The pass peaked at about 30 degrees above the horizon and there was
some local RFI from sources i
Mode A seems to be more tolerant of lower power coming
from the solar panels than Mode B. Still you can tell
that the satellite is suffering. A 5 watt CW signal will
cause the bird to FM but it is not driving the bird to its
maximum power capability. I heard N4ASF much louder on it
in CW on the
Since AO-7B came out of the eclipsed orbits, it has been
performing poorly. I can usually do very well on the low
elevation passes towards Europe, but now I may only be able
to hear my own cw signal with no other signals heard.
Today on the 2116utc pass I worked PV8DX on CW but as the bird
moved
I tried the pass that started here around 1600 UTC. I could hear the
downlink but the quality of the signal was like what I noted during
the previous pass: faint and crackling.
By comparison, I called CQ on VO-52 which came a few minutes after I
was finished. The downlink was strong and clear s
Hi all!
Just wanted some comments as to what ops are using for AO-7 portable.
More importantly, some info on how they perform near loss of signal.
Pictures of antenna arrays would be greatly appreciated.
Norm n3ykf
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I recently put together a rotatable dipole for 10m for mode A reception. There
isn't room for it on the satellite tower, which is a MA-40 with 2m, 222, 435,
and 23cm yagis already. I do have a push up pole with a 5 element CC 6m yagi
and G450 that I'm sure would handle the additional load, but I
I had a nice Mode A QSO with Brent, VA5MS, on the 1407-1427 pass this
morning. Also heard KC9ELU but the bird was a bit far to the west for him.
AO-7 will be in Mode A for most of SKN, so get those 10-meter antennas ready!
CU then,
Ray W2RS
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Are there any stations in Mexico, Central or South America that is
interested in working AO7?
I am looking to try and work anyone on AO7 mode B. I am presently trying
to get my antennas put up for working Mode A but it will be another week
or more before I am ready to try Mode A.
If anyone i
The AO-7 pass just concluded here reached maximum elevation of 31 degrees
to the wesf of my QTH (DM41lu), and the satellite was in Mode V/A (also
called Mode A). With about 100 watts EIRP my downlink signal was RST 589 but I
had the passband to myself. Nothing but me and the beacon, which was
Was wondering something, being rather new at all this.
Worked someone last week on AO 7 but mostly I just hear myself. So I am
convinced that the bird and I are in fact functional.
I've listened, tuned around, and threw out my call, where is everyone?
For example this early A.M.
Operational linear transponder satellites have dwindled to only two: VO-52
and AO-7. The latter, now 37 years old, spends approximately half its
operating time on the V/A transponder, or what we used to call Mode A:
145.85-145.95 MHz uplink, 29.4-29.5 MHz downlink.
Unfortunately, activiity
What is that other web site where we can keep track of what mode AO-7 is curren
tly in? Having senior moments and can't keep track of it.
73 Bob W7LRD
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"Account suspended"... hacked, perhaps?
George, KA3HSW
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I notice when AO-7 is out there at 4000km I can notice the delay in cw from my
monitor to the 8000km round trip to and from AO-7. Kind of shades of AO-40
(sobsob) when the delay was really noticable, and when we listened to ourselves
(ssb) we had to turn down the rx volume a little as no to s
Hello AO-7 fans
Just worked OH5LK in KP30on from CN87wk, near Seattle, Wa., that's 7692km. I
believe the record is 7766km, but whose keeping track . So you N.
European stations keep listening to your LOS.
73 Bob W7LRD
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There is a huge difference in signal quality between
Mode A and Mode B on AO-7. I've been working Europe on
Mode A days and have found that the audio quality is
excellent. I've experimented with higher power levels
to see how the transponder performs and have found that
it can handle the highest
Not having much experience working the SSB birds, can anyone give me a rough
schedule of when AO-7 goes from mode B to A and vice versa, and what mode it is
in right now. I am supposed to work a SSB pass with a guy this coming Monday
night around 2300z, and we only have mode B equipment. Is th
to those interested-AO-7 switches mode at 2335Z exactly. Seems to increase
in time very very slowly.
73 Bob W7LRD
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Those of you working AO-7, what is a good minimalistic set-up?
Should I be able to work it with an Arrow antenna, a RX pre-amp,
and a Ten Tec Mode B box?
Bill W1PA
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Hello All
�
I am a novice
satellite operator. I have been completing my setup for satellites and recently
I made
my first contact on AO- 51 with John K8YSE.
�
I wonder if is
possible for me use the AO-7 in mode B. I tried to hear it in different passes,
but I
didn’t hear anything, neither t
Last two passes no go on AO-7, either mode. Anyone use it??
73 Bob W7LRD
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Has anyone experienced anything like this on AO-7 Mode A?
Earlier today on pass 65777 ( AOS approx. 2207z) I was looking for my
downlink signal shortly after my AOS. While searching for my downlink signal I
could also hear a few other unidentifiable CW stations. I figured they were
also loo
Hello
Check out the log for AO-7 http://www.planetemily.com/ao7/ao7log.php you will
notice how much activity it gets from our European friends, as compared with
the U.S. From many parts of the U.S some good DX can be had. Even from way
over here in Seattle I can work a "piece" of Europe.
Saw a post a few days ago regarding AO-7 Mode change.
Today 13 Jan, 2011 the mode changed from A to B at 23:28z.
Seems like it is getting later as time progresses. Last time I noted a changes
was back in late Novenber at about 23:23z and in mid December at 23:25z.
Scott AA5AM
There is a link off of the AO-7 resource page for a logger for scheduling
contacts but it doesn't work.
Does anybody know of a real time/near time reflector for scheduling more
specifically AO-7 contacts or even a general reflector covering all the
satellites?
Thanks in advance and 73,
I will have a 3-4 minute footprint into N. Europe next pass at 1858Z. Check
your tracking program to CN87, maybe we can make it happen! Around 145.951 +/-
a little.
73 Bob -W7LRD
Seattle- CN87
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FYI-AO-7 switched from mode B to A right at 2321Z. Right in the middle of a
qso. The old bucket of bolts seems to pretty good time.
73 Bob W7LRD
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I notice, looking at the logbook on the AO-7 website that the Europeans utilize
Mode A alot more than use here in NA. Since the downlink frequency is in the
upper 10 meter band, and I wondering what antenna they are using for receive?
I
have tried dipoles, horizontal loops, G5RV, etc to prett
Last pass I coppied LA4FPA jus t at his LOS. Next pass at 1910Z, I will have a
good window into N. Europe. Look for me.
73 Bob W7LRD
CN87
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Hello folks,
I have been mostly mode B user on AO- 7 satellite but
today I decided to try mode A from my summer QTH. I have two
antennas
for downlink (vertical and Spiderbeam with four elements for 28MHz) and
no problems for receiving signals from the sat. Of course because of
the polarsation
Hello Dieter.
Try this.
Click on ... NEW CONTACT.
Scroll to the bottom of the page.
Check the - REMEMBER ME- box.
You should now be able to edit your 'own' entries by clicking on the spyglass
at the left of the screen.
Despite repeated requests, N1DID (formerly W0EEC) ne
The AO-7 Mode A pass on 9/18/10 at approximately 1430 UTC (POS with 14 degs
elevation) at my location, FM-19, was truly impressive. The CW downlink was
rock solid for the entire pass into my little 2 element 10 meter yagi with
my uplink power of 10-15 watts into a 3 X 3 element RHCP yagi. The CW
Hello to my fellow AO-7 fans- Next pass at 1902Z keep an ear out for me at your
LOS from CN87wk (Seattle, Wa.)
73 Bob W7LRD
Seattle Wa.
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Trying to stretch the footprint on AO-7 mode A is a most masochistic endeavor.
I have been collaborating with JH1BCL PM96ng to my qth in CN87wk (Seattle). At
7719km a stretch for mode B, painfull for mode A. This evening I coppied a
piece of Shige's call. If the sunspots ever get going the
AO-7 has now operated longer this second time around ... (compared to the first
time from the 1974 era).
Details on the AO-7 Resource Page.
73 John.
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Hello Northern Europe-At 1836Z you will have a short window to CN87 (Seattle
Wa.) on AO-7. I will be there.
73 Bob W7LRD
CN87wk
Seattle, Wa.
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Anyone know the best distance for mode A on AO-7? Is there a "gate keeper" for
such information? I am trying to work JA from Seattle, right now it's all
email and planning.
73 Bob W7LRD
Seattle
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Hello,
Congratulations, Joe and Luciano, on your outstanding, record-setting QSO! We
must also give credit to the " Powers of the Heavens Above" who have kept AO-7
communicating with us!
73's Pete
WB2OQQ
www.massapequanyweather.com
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Hello friends,
The new record via AO-7 was established today between Luciano, PY5LF and Joe ,
K3SZh via AO-7. The distance the new record is 7839 KM. I have a audio record
with a portion of the QSO. The log of QSO can be seen on web site
http://www.planetemily.com/ao7/ao7log.php . Congratul
AO-7 seems "stuck" in mode B. This is not a bad thing. Anyone know, how, why
etc.
73 Bob W7LRD
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Hey everyone,
I've never heard AO-7 so busy.
I'm sure she has been - "in the old days," back in the 1970s when she was
still new to orbit. But tonight on the pass that reached the W4G Field Day
site about 0026 UTC, I heard more stations on AO-7 than I've heard in the
two years I've been wor
One thing I always noticed is that its recommended to not exceed 5 watts
when operating on AO-7, but I'm not seeing anything about maximum gain to
use. I have an Arrow II handheld yagi and on the 440 side supposedly it has
a 10dbd gain which would give me effectively 50 watts output assuming no
los
AO-7 has normally switched modes every other day
except during periods of eclipse when it stays in
Mode B. On June 8th, it was in Mode A as predicted,
however, when it was supposed to switch to Mode B
between 0200 and 0500 on June 9th, the AO-7 log reported
that it was heard in Mode B at 0407z by
Hello
Just got off AO-7, it really sounds not too good. Weak and distorted audio.
Like not enough voltage from the 35 year old solar cells. Heard eveything from
response to a CME event to being in mode C to being hit by whatever. The audio
distortion does not depend on the uplink power,
Some days we are seeing very strange behavior in the AO-7. In some orbits can
only hear the feedback on the downlink when the satellite is approaching my
station at about 30 degrees elevation, before is impossible to hear any signal
via AO-7. Using two pre-amplifier, one in the TS 2000x and t
Hi folks,
Since starting my effort to work Europe on AO-7, I've found that the very low
elevation sigs vary significantly on different
passes. Some mornings I can easily hear my downlink and start working
Europe at 0.7 degrees elevation, while other days I can't hear myself
until 5 degrees el
To whom it may concern,
I no longer edit the AO-7 Resource Page.
73 John.
...
> Subject: AO-7 Logbook Website Contact - AO-7 Info For Site
> To: em...@planetemily
Hi All,
We printed some CW telemetry from AO-7 at K4T during our trip. Just checked it
now, and it's back on loud.
73,
Mark L. Hammond [N8MH]
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Hello All,
Just heard AO-7's 70cm CW beacon sending valid telemetry (2010/03/14
07:25 UTC). Entering the data below into the spreadsheet gives a beacon
power output of 338mW. All else seems nominal.
73 de David VK5DG
HI HI
100 172 177 177
273 201 210 254
370 311 344 347
431 440 441 441
531
at 23:11Z. RTTY is slightly audible, no idea if it is decodable or not.
73, Drew KO4MA
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I am copying a very strong carrier on AO-7 as I write this...
435.106MHz , no signs of modulation. Planet Emily latest reports show the
transponder might be off... I didn't listen for myself... have to swap co-ax,
but I was busy trying to figure out if the carrier were definitely the old
girl,
Hello friends,
Today in the 161.057 orbit of the AO-7 approximately 22:51 UTC our friend
Joe, K3SZH, managed to maintain a short QSO with Francisco Ramirez, PY2OV. The
distance between the two stations was 7738 km (4833 Miles). And with absolute
certainty the QSO could be extended by a grea
Congratulations Bob. You and Fedor managed to work a good distance via AO-7.
73,
Piraja, PS8RF
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