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Keighley’s
preferred Operational Frequencies |
All good radio amateurs are
constrained to using certain bands of frequencies. Within each band, voluntary
band plans assign "emergency priority" frequencies that RAYNET uses.
Keighley's preferred choice of
operating frequencies are below but may be changed for operational reasons
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Frequencies (MHz)
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Notes
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- 144.6750 NBFM
- 144.6250 or 144.6375 NBFM
- 144.7250 NBFM (not assign to RAYNET)
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- Main
- Secondary
- On-site hand held, Engineering and
Inter-checkpoint communications frequencies
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Leeds RAYNET net is on 144.625
MHz on Monday at 20:00
National RAYNET Frequencies
80 meters
3.663 MHz SSB National
co-ordination during emergencies and the 80 meter RAYNET News every Sunday at
08:30 local time
40 meters
7.090 MHz SSB National
co-ordination during emergencies
6 meters
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51.210 NBFM
51.950 NBFM
51.960 NBFM 51.970 NBFM 51.980 NBFM 51.990 NBFM |
A
large number of Internet Gateways use
51.950,
effectively making it unusable for RAYNET in many areas
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Keighley RAYNET running
one of the talk-through on the Ripon "100"
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4 meters
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Leeds RAYNET's 3 Peaks Race
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70.3500 NBFM
70.3750 NBFM
70.4000 NBFM
70.3500 is listed
for digital mode use as well as emergency communications |
2 meters
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144.260 USB 144.625
NBFM
144.650 NBFM
144.675 NBFM
144.775 NBFM
144.800 NBFM 144.825 NBFM 145.200 NBFM
145.225 NBFM |
144.800 NBFM - Data
communication (shared with APRS)
145.200
Emergency Communications Groups utilising this frequency should take
steps to avoid interference to ISS operations in non-emergency
situations.
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G0SCV on a checkpoint
for Keighley RAYNET
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There is still some residual
packet operation on 144.650 and the French band plan still uses the 144.6xx
part of the band for packet. Frequencies should be chosen with care,
particularly when using talk-through units
70 centimetres
Keighley RAYNET
running talk-through for Leeds RAYNET
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433.700 NBFM
433.725 NBFM
433.750 NBFM
433.775 NBFM
433.700 is listed
as IARU Region 1 packet as well as emergency communications.
438.400 - 430.800 NBFM, Voice repeater
Base TX on 438.400
mobiles TX on 430.800 (-7.6MHz repeater shift. This has been chosen so
that usage is compatible with most modern radios which have a wide
negative shift available as standard).
This is a 7.6MHz split repeater pair in the 70cm "wide" repeater
section. Further information about this portion of the band can be
found on the RSGB's
Repeater
Management Committee website.
432.775 - 434.375 NBFM,
Voice repeater
Base TX on 432, mobiles TX on 434 (standard +1.6MHz repeater shift)
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The International Space Station
As a result of feedback from
last week's GB2RS news item regarding the use of 145.200MHz and 145.800MHz by
the International Space Station, the RSGB Spectrum Forum feels some
clarification is needed and the following joint statement has been agreed with
the IARU Region 1 Satellite Co-coordinator, the RSGB's Radio Communications
Voluntary Services and The Radio Amateurs' Emergency Network Spectrum Forum
members.
Although both the frequencies
145.200MHz and 145.800MHz have historically been used for domestic UK
emergency communications, it was agreed at the IARU Region 1 Conference in
1996 to allocate 145.200MHz as an FM uplink channel with 145.800MHz serving as
the downlink side of the pair. This particular frequency pair, which applies
only for Region 1, had earlier been agreed by IARU internationally after
discussions with NASA and AMSAT.
The likelihood of an active
ISS pass taking place at the same time as bona fide UK emergency
communications operations using 145.200MHz and / or 145.800MHz is considered
low and due to the nature of circumstances would only be for a brief period in
any case. In addition, the UK amateur radio emergency communications community
has for many years discouraged the use of 145.800MHz as far as possible, and
even then only using low power and vertical polarisation, due in any case to
its proximity to the satellite sector.
UK terrestrial stations are
therefore again requested to check for activity from ISS before transmitting.
Details of the ISS orbits can be found on the Internet.
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