Phase 3-D Frequencies


Final Frequencies Selected for Phase 3-D
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: [email protected]

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

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