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Peter Miles
Northam, Western Australia
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UFO-8
(USA-138)
UFO-8 (USA-138) Background and technical
overview.
HOME >
OPERATIONAL
> MODES
& FREQUENCIES > SATELLITES
- RADIO TARGETS >
Contemporary documentation describes the UFO satellites as having approximately 21 × 5-kHz narrowband channels, 17 × 25-kHz channels and a 25-kHz fleet broadcast channel.
There is documented unauthorized/pirate radio activity on the UFO satellite family, and there are specific reports associated with UFO-8. However, the evidence is much stronger for some UFO satellites than others.
Details
| Satellite: |
UFO-8 (USA-138) |
| Norad ID: |
25258 |
| Operator: |
US Navy |
| Status: |
Operational,
however superseded by MUOS. |
| Frequency Range: |
240.0 -
270.0 MHz VHF Down Link
Ka-band Global Broadcast Service
(GBS) downlinks are documented as 20.295, 20.415, 20.475 and 20.595 GHz
|
| Mode: |
FM |
| Altitude [km]: |
35,800km
Geosynchronous, near-equatorial at
Longitude 149.68 |
| Tracking: |
https://www.n2yo.com/?s=25258 |
Channel
confirmation was achieved by monitoring the channel frequency for
consistency with the band plan, verifying the bandwidth and antenna
targeting to assess the SNR (signal-to-noise ratio).
|
|
Bandwidth |
Status |
| 244.075
MHz |
6
kHz |
|
| 244.085
MHz |
6
kHz |
|
| 244.095
MHz |
6
kHz |
|
| 244.105
MHz |
6
kHz |
|
| 244.115
MHz |
6
kHz |
|
| 244.125
MHz |
6
kHz |
|
| 244.135
MHz |
6
kHz |
|
| 244.145
MHz |
6
kHz |
|
| 244.155
MHz |
6
kHz |
|
| 244.165
MHz |
6
kHz |
|
| 244.175
MHz |
6
kHz |
|
| 244.185
MHz |
6
kHz |
|
| 244.195
MHz |
6
kHz |
|
| 244.205
MHz |
6
kHz |
|
| 244.215
MHz |
6
kHz |
|
| 244.225
MHz |
6
kHz |
|
| 250.550
MHz |
30
kHz |
~30-kHz
observed bandwidth |
| 252.050
MHz |
30
kHz |
|
| 253.750
MHz |
30
kHz |
|
| 255.450
MHz |
30
kHz |
|
| 257.050
MHz |
30
kHz |
|
| 258.550
MHz |
30
kHz |
|
| 260.425
MHz |
30
kHz |
|
| 260.525
MHz |
30
kHz |
|
| 261.625
MHz |
30
kHz |
|
| 261.725
MHz |
30
kHz |
|
| 261.825
MHz |
30
kHz |
|
| 261.925
MHz |
30
kHz |
|
Reception Reports
References
TOP
OF PAGE
Page initiated 29 September, 2026
Page
last revised 29 September, 2026
|
|
|
Space Weather
https://www.swpc.noaa.gov/
|
James
Chadwick born 20 Oct 1891
Was
a British physicist who discovered the neutron in 1932,
revolutionising our understanding of the atomic nucleus and paving
the way for major advances in nuclear physics. He won the 1935
Nobel Prize in Physics.
|
Notice Board
|
VK6YSF JS8Call and
Olivia 8/250 operations.
Current activity is generally
focused - though not restricted to - JS8Call operations on the 20,
40m and 80m bands.
Olivia 8/250 is used occasionally on the 20m band.
Proposed
band and mode activity
is often communicated on HamSpots: https://hamspots.net/js8/
or my profile on
X: https://x.com/vk6ysf97230
.
Post
date: 14 October 2026
|
|
Local
Repeaters
Repeaters Page Updated
- Expanded and refreshed information on VHF and UHF repeaters across Western Australia's Central Coast, Perth, the Avon Valley, and the Peel region. New AllStar Link information has also been added, including linked repeater details and
gateway information across the State.
Repeaters
details:
https://vk6ysf.com/local_repeaters.htm
AllStar Link notes:
https://vk6ysf.com/allstar_notes-20260703.htm
Post
date: 14 October 2026
|
|
Western Australian SSTV net
Popular
Western Australian SSTV net for both digital and anolog SSTV.
Generally
found at 7214.0kHz LSB every afternoon from 08:00 UTC (4:00pm WST)
For more
details: https://www.wasstv.net/wasstv.net/index.html
Post
date: 8 December 2025
|
|
VK6MJM LF (136kHz) and MF (474kHz) Beacon
VK6MJM is a LF/MF station
located in Manjimup, Western Australia.
Common Mode: FST4W 300 (Similar to
WSPR)
Note:
other modes and sub-modes may be used.
Station details were presented by
Peter Hall (VK6HP) at PerthTech 2024.Presentation PDF: Peter
Hall VK6HP at PerthTech
QRZ Page: VK6MJM
on QRZ.com
Post
date: 10 March 2025
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