Final Frequencies Selected for Phase 3-D

Update: August 1998 Frequencies


January 8, 1995

Following a series of discussions, a number of iterations and intensive study, the builders of the Phase 3-D communications equipment have made their final selections of the frequencies to be employed by the satellite, scheduled to be launched in April, 1996. These selections have since been approved by the P3-D Project Leader, Dr. Karl Meinzer, DJ4ZC.

These frequencies were carefully selected to minimize mutual interference with other amateur satellites and have been coordinated with IARU bandplans by the P3-D Frequency Coordinator, Freddy de Guchteneire, ON6UG, with assistance from Peter Guelzow, DB2OS, and Werner Haas, DJ5KQ.

Crystals have been ordered for all receivers and transmitters to implement these frequencies. In accordance with the Phase 3-D design concept, all receivers and transmitters are connected to the IF Matrix which allows interconnection of the various receivers and transmitters to create what have been known as "transponders" on former amateur satellites.

The selected Phase 3-D frequencies are as follows:

Uplinks

 BAND        DIGITAL (MHz)               ANALOG (MHz)        CENTER (MHz)
  15m             N/A                  21.210 -  21.250         21.230
  2m        145.800 -  145.840         145.840 -  145.990       145.915
 70cm       435.300 -  435.550         435.550 -  435.800       435.675
 23cm(1)   1269.000 - 1269.250        1269.250 - 1269.500       1269.375
 23cm(2)   1268.075 - 1268.325        1268.325 - 1268.575       1268.450
 13cm(1)   2400.100 - 2400.350        2400.350 - 2400.600       2400.475
 13cm(2)   2446.200 - 2446.450        2446.450 - 2446.700       2446.575
   6cm     5668.300 - 5668.550        5668.550 - 5668.800       5668.675

Downlinks

 BAND        DIGITAL (MHz)             ANALOG (MHz)         CENTER (MHz)
  10m      29.330 (+/- 5 KHz)     (used for digitized voice bulletins)
  2m       145.955 -  145.990       145.805 -  145.955        145.880
 70cm      435.900 -  436.200       435.475 -  435.725        435.600
 13cm     2400.650 - 2400.950       2400.225 - 2400.475       2400.350
  3cm    10451.450 - 10451.750     10451.025 - 10451.275     10451.150
 1.5cm   24048.450 - 24048.750     24048.025 - 24048.275     24048.150

All downlink passbands are inverted from the uplink passbands.

Beacons

 
BAND     Beacon-1(MHz)     Beacon-2 (MHz)
 
 2m         N/A               N/A
 70cm       435.450          435.850
 13cm      2400.200         2400.600
 3cm      10451.000        10451.400
 1.5cm    24048.000        24048.400

Note: The absence of a 2 meter beacon is due strictly to characteristics of the IF Matrix and the limited bandwidth available on that band. Studies are underway with the intent of providing a 2 meter beacon, but it is not clear at this time whether this effort will be successful. The beacons on the other bands are for various purposes including providing spacecraft engineering data to the command stations. All beacons can be modulated with 400 bits per second BPSK and possibly other formats.

The AMSAT News Service wishes to thank Phase 3-D International Satellite Team members Freddy de Guchteneire, ON6UG, Peter Guelzow, DB2OS, Werner Haas, DJ5KQ and Karl Meinzer, DJ4ZC, for the information that went into this news release.

For More Information

Keith Baker, KB1SF.

Email: kb1sf@amsat.org


Created 19 Mar 1995. Text by Keith Baker, KB1SF. HTML conversion by KB5MU.

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