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Phase 3D


Official Transponder Frequency Bandplan

After several iterations and as a result of intensive research and discussions with all involved transponder builders, the P3-D Project Manager Dr. Karl Meinzer, DJ4ZC gave his final OK to the P3-D Transponder frequencies.
They have been carefully selected to minimize mutual interferences with other satellite projects and are also coordinated with IARU bandplans by the P3-D Frequency Coordinator, Freddy de Guchteneire, ON6UG, with the help of Peter Guelzow, DB2OS and Werner Haas DJ5KQ.

P3-D Uplink Frequencies

UPLINK  Digital  Analog Passband 
15 m  none  21.210 - 21.250 MHz 
12m none 24.920-24.960 MHz
2 m  145.800 - 145.840 MHz  145.840 - 145.990 MHz 
70cm  435.300 - 435.550 MHz  435.550 - 435.800 MHz 
23cm(1)  1269.000 - 1269.250 MHz  1269.250 - 1269.500 MHz 
23cm(2)  1268.075 - 1268.325 MHz  1268.325 - 1268.575 MHz 
13cm(1)  2400.100 - 2400.350 MHz  2400.350 - 2400.600 MHz 
13cm(2)  2446.200 - 2446.450 MHz  2446.450 - 2446.700 MHz 
6cm  5668.300 - 5668.550 MHz  5668.550 - 5668.800 MHz 

P3-D Downlink Frequencies

DOWNLINK Digital Analog Passband
2m  145.955 - 145.990 MHz  145.805 - 145.955 MHz 
70cm  435.900 - 436.200 MHz  435.475 - 435.725 MHz 
13cm(1)  2400.650 - 2400.950 MHz  2400.225 - 2400.475 MHz 
13cm(2) 2401.650 - 2401.950 MHz 2401.225 - 2401.475 MHz
3cm  10451.450 - 10451.750 MHz  10451.025 - 10451.275 MHz 
1.5cm  24048.450 - 24048.750 MHz  24048.025 - 24048.275 MHz 

P3-D Telemetry Beacons (IHU)

BEACON General Beacon (GB) Middle Beacon (MB) Engineering Beacon (EB)
2 m none 145.898 MHz none
70cm 435.438 MHz 435.588 MHz 435.838 MHz
13cm(1) 2400.188 MHz 2400.338 MHz 2400.588 MHz
13cm(2) 2401.173 MHz 2401.323 MHz 2401.573 MHz
3cm 10450.975 MHz 10451.125 MHz 10451.375 MHz
1.5cm 24047.885 MHz 24048.035 MHz 24048.285 MHz

Beacon Frequencies have been measured before launch at Kourou and may change due to
aging, vibrations or temperature. 2-m-MB and 13-cm(2)-MB have already been measured in orbit.


  • All Receivers are inverting!
  • Telemetry Beacons are for command purposes and are modulated in 400 Bit/s BPSK, AMSAT format.
  • The MB can be switched between IHU-1 or IHU-2 telemetry.

Phase 3D - AMSAT OSCAR 40

AO-40: X-band report

Stacey W4SM and Michael OH2AUE tested the X-band transmitters (solid state and TWT) yesterday (2001-05-13) between 04:11 UTC and and 06:00 UTC.
Unfortunately the test was not successful. The IHU-1 telemetry indicates the proper commands, but indications are that no power is getting to any of the X-band modules. Nothing happened... In fact, even the status of the
temperature sensors in the X-band modules did not change. These sensor are not thermistors like the rest and need power supply to give valid
readings. The values did not changed when the module was commanded on, thus there is no electrical power within the module. The problem must be either in the 28V-S supply or in the module power control line from the IHU. Such a problem was never observed during all the testing in Orlando and Kourou. A
software problem is very unlikely. However, it is planned to investigate this further in the next few days and another attempt will be made soon.

LEILA, RUDAK, X, C and more...

History was made on Saturday (May 12th) when the LEILA system on AO-40 was turned on for the first time! This morning a couple of *very* strong signals
appeared in the passband, several dB louder than the MB!!! Several people tried to get them to reduce power, but they apparently weren't listening. The AGC on the U-band Rx was suppressing up to 16 dB, clearly in sync with their transmissions and there was massive grumbling on the passband.... Remember that the MB is 8dB louder than the GB and users should not be stronger than the GB. So, it was decided that this might be a good chance to test LEILA. LEILA was switched into the U-band passband, which can be seen by the
MATRIX configuration. LEILA was configured for SCAN/JAM/NOTCH mode and it worked like a charm!!

The threshold was set to a level which was approximately equal to the GB signal, which means any stronger signal will be detected by LEILA.. an "police siren" will be heard to give a chance to reduce power, otherwise the notch
will do it's best... :) People on the passband loved it! This is indeed another major success within a few weeks for AO-40 and in particular for the
LEILA concept (LEIstungs Limit Anzeige), which was designed by AMSAT-DL (Dr. Karl Meinzer DJ4ZC and Matjaz Vidmar S53MV)and also supported by the german ministry of science and technology. Indeed, it is the first time that such a system is used in space for a transponder with uncoordinated multiple access.
If everything goes well, we will probably leave LEILA continuously in the loop..
Meanwhile the RUDAK team did also good progress and both CPU's are running now for more than 10 days. In a 6 hour effort on friday morning Jim White WD0E finished loading the GPS task into RUDAK-A and loaded the
CEDEX task. Both tasks are running but commands to begin their operations were not yet sent. This is planned for saturday or sunday, when data from CEDEX will be logged and possibly a GPS lock sequence will be initiated.
Jim also reported that RUDAK-A TLM continues to look normal and also the
SmartNode temperature sensors on the CAN bus seem to work fine. Both 153.6 KBit/s highspeed PSK downlinks were also verifi edand they came on as expected and were turned off again later. While at zero Doppler the
downlink frequencies of the 9k6 hardware modulators through S1 are:
RUD A mod 0 = 2400.791
RUD A mod 1 = 2400.765
RUD B mod 0 = 2400.910
RUD B mod 1 = 2400.891
(measured with an accuracy of +-5 KHz)

And finally... X-band and possibly C-band testing this morning!!!

73s Peter DB2OS
for the whole AO-40 team


AO-40 Equipement


Phase 3D - 10 GHz dish

(C) 2001 Gyetvai Zoltán OM7AQ