6 May

AO-7 CW beacon 145.971 MHz

Friday, May 6th, 2016 by

09:45 UTC
I recorded flawless CW telemetry signals, from AO-7/B satellite.
vy 73 de Imre HA1SE

Hi Hi 181 121 173 191 262 270 209 252 367 324 330 350 447 458 456 458 540 502 517 527 600 600 602 651

ao7_cw_06052016

18 Aug

AO-7 CW Telemetry

Tuesday, August 18th, 2015 by

AO-7 CW Telemetry 18-08-2015 16:16 UTC

No idea whether these values have something useful to tell about this old lady

HIHI 100 170 121 157 215 292 206 254 367 311 37* 380 406 4** 490 4*1 517 53* 568 56* 6*6 6*6 6*6 6*6 
HIHI 100 180 1** 1** 25* 252 2** 2** 324 324 3*4 324 496 411 486 413 536 563 568 573 698 607 600 60*
HIHI 100 181 156 170 252 271 25? 2** 328 320 340 352 496 49B 496 486 568 568 568 560 6*7 696 696 64* 
HIHI 100 18* 1*0 18* 25* 25* 2** 252 324 3?4 3** 3*4 4*6 496 4*6 4*6 568 568 568 568 696 6*6 696 6** 
HIHI 100 18* 18* 180 252 252 ?68 252 359 305 326 326 496 455 457 456 541 500 544 532 600 601 600 651 
HIHI 100 181 157 181 285 268 213 234 321 324 329 348 449 435 438 444 512 501 534 531 600 60* 60* 650 
HIHI 100 196 107 181 279 286 206 252 371 324 3** 3** 4** 4** 4** 4** 5** 5** 5** 5** 6** 6** 6** 6**

AO-7-18082015-1616UTC

16 Jul

AO-7 CW beacon

Thursday, July 16th, 2015 by

I received good cw beacon from ao7 in mode b at around 22:20 UTC July 16.
The beacon shut off during the pass and the satellite appeared to shut off also.

HI HI 180 180 180 180 252 252 252 252 324 324 324 324 496 496 496 496 568 568 568 568 696 696 696 696

The beacon repeated several times before shutting off.

Kerry La Duke

2 Jun

AO-7 CW TLM Heard

KE8AKW Tuesday, June 2nd, 2015 by

While listening to a pass on 6/1/20-15 19:49 UTC AO-7 CW Tlm beacon on 2M was decodable. At about 19:50 UTC it was no longer decodable. I suppose this is quite a rareity to hear, but looks like the data is uselss, but keep listening for it!…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. This is all i got before the beacon got demodulated and undecodable..

8696 568 568 568 568 696 696 696 696 hi hi 080 180 180 180 252 252 252 252 324 324 324 324 496 496 496 496 568 568

31 Jul

AO-7 CW telemetry

Thursday, July 31st, 2014 by

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/options. Recently there have been times where the beacon has transmitted clear CW over North America, something I have not heard over the years.

According to the DK3WN website, there was some cw telemetry back in 2002 when the satellite was discovered to be working again. And there was some discussion about what is valid data based on the last 3 digits sent in the 24 group block of data. If the value is 649, 650, or 651, the data is likely valid.

I first heard the image of the cw signal around 958. It was so loud I thought it was a valid user at first. But since the cw was all numbers I tuned up to the beacon frequency and there the signal was louder than anything I have ever heard on AO-7. It took a while for me to get the recorder running but I managed to capture some data. After playing it back I found that there was only one block of data where the last group was valid, a 649. Other later transmissions were loud but the data was much different and the last group was not correct.

I couldn’t locate a telemetry calculator at first so I decided to build one on Excel using the formulae provided by DK3WN. The data follows:

AO-7B Telemetry 24July2014   2318UTC
POS  Parameter                Range     Raw  Real

1A Total Solar Array Current  0-3000ma  171 2094.5ma
1B +X Solar Panel Current     0-2000ma  193  110ma
1C -X Solar Panel Current     0-2000ma  157  830ma
1D +Y Solar Panel Current     0-2000ma  108  1810ma
2A -Y Solar Panel Current     0-2000ma  286  250ma
2B RF Power Out 70/2          0-8watts  204 7.3728W
2C 24 Hour Clock Time         0-1440min 201 15.16min
2D Batt Ch/Discharge Current-2000/+2000 207  -1720ma
3A Batt Voltage               6.5-16.4  361  12.7V
3B Half Batt Voltage          0-10v     397   9.7V
3C Batt Charge Reg #1         0-15v     340   6V
3D Batt Temperature         -30 to +50C 300   95.8C
4A Baseplate Temperature    -30 to +50C 446   27.72C
4B PA Temperature 2/10      -30 to +50C 401   94.32C
4C +X Face Temperature      -30 to +50C 430   51.4C
4D +Z Face Temperature      -30 to +50C 498  -49.24C
5A PA Temp 70/2             -30 to +50C 545   29.2C
5B PA Emitter Current 2/10    0-1167ma  502   92.84MA
5C Module Temp 70/2         -30 to +50C 543   32.16C
5D Inst. SW Regulator         0-93ma    527   33.14MA
6A RF Power Out 2/10         0-10,000mw 606   23.076MW
6B RF Power Out 435           0-1000mw  643   219.9MW
6C RF Power Out 2304          0-100mw   679   255.881MW
6D Midrange Telemetry Cal     0-.5v     649   0.49

There are some values which are obviously not correct.
Some sensors might not be working properly since some values are out of range. However, the solar panel numbers might be somewhat correct. I wouldn’t doubt it if the transmitter was putting out 7 watts at the time.

Perhaps there are those who are familiar with the AO-7 telemetry that can make some sense out of the data.
Unfortunately we don’t have multiple blocks of good data to compare readings. Maybe some have recorded recent CW data and can find some good blocks that can be shared here.

The data was copied on my Arizona remote and Skype was being used to listen. But I am fairly confident that the cw copied is correct.

73,
John K8YSE

2 May

AO-7 eclipse season has started

Friday, May 2nd, 2014 by

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

ao7_illum

18 Feb

OSCAR 7 Close Approach Notification

Monday, February 18th, 2013 by

The United States Joint Space Operations Center (JSpOC) has updated a predicted conjunction between OSCAR 7 (SCC# 7530) and SCC# 18116.

Primary Object: OSCAR 7 (SCC# 7530)
Secondary Object: SCC# 18116
Time of Closest Approach: 18 FEB 2013 22:06 UTC

Overall miss distance: 81 meters
Radial (dU) miss distance: 32 meters
In-Track (dV) miss distance: -36 meters Cross-track (dW) miss distance: 66 meters

Primary Radial Error (U): 10 meters
Primary In-Track Error (U): 39 meters
Primary Cross-track Error (U): 8 meters

Secondary Radial Error (U): 10 meters
Secondary In-Track Error (U): 43 meters Secondary Cross-Track Error (U): 10 meters

Some reception reports immediately after would be appreciated.