|[AMRadio] Phone band expansion|
k4kyv at hotmail.com
Thu Oct 12 02:45:45 EDT 2006
Up to an extra 150 kc/s for phone on 75 m for Extra class.
75m Phone Allocations
General Advanced Extra
Current 3850-4000 3775-4000 3750-4000
New 3800-4000 3700-4000 3600-4000
Increase 50 75 150
40m Phone Allocations
General Advanced Extra
Current 7225-7300 7150-7300 7150-7300
New 7175-7300 7125-7300 7125-7300
Increase 50 25 25
Much better than anything I had anticipated, but we are still left with a
cumbersome matrix of subbands based on operator class combined with emission
Considering the relief in congestion we have already experienced due to the
general decline in amateur activity in recent years, there should be plenty
of room for all on 75m, without the griping about AM "taking up too much
room on the crowded band." Of course, if the FCC eventually eliminates the
code requirement, expect an initial spike in activity as hoards of no-code
Techs upgrade, but after the initial spike I predict a return to stagnant
growth. There should still be plenty of room for AM activity.
Once the expansion goes into effect, we should immediately commence AM
activity on the new frequencies, including the 3600-3700 kc/s Extra segment.
I have looked over the R & O, but I am not sure if it means that 3600-3700
is restricted to Extra class for all modes, or just that Extras can now use
phone in the segment. How this will affect non-voice licence class
restrictions is not made entirely clear in the FCC document:
"12. Regarding the division among license classes of the spectrum on which
authorize phone emissions, we adopt the Commissions proposal to authorize
stations of General
Class licensees to transmit voice emissions in the 3800-4000 kHz frequency
increasing by 50 kHz the spectrum for voice communications by these
stations. Because we
have decided to authorize more 75 m spectrum for voice communications than
was proposed in
the NPRM, we also authorize stations of Advanced Class licensees to transmit
voice emissions in
the 3700-4000 kHz frequency segment, thereby increasing by 75 kHz the amount
of spectrum for voice communications by these stations. We also authorize
stations of Amateur Extra Class
licensees to transmit voice emissions in the 3600-4000 kHz frequency
increasing by 150 kHz the spectrum authorized to these stations for voice
the 40 m and 15 m bands, we adopt the Commissions proposal to authorize
stations of Amateur Extra and Advanced Class licensees 7125-7300 kHz,
stations of General Class licensees 7175-7300 kHz, and stations of General
Class licensees 21275-21450 kHz for phone communications."
If Generals and above will still be able to use 3600-3700 for non-voice
modes, expect digital modes to continue to operate in this segment. I
suspect that may be the reason such a big hunk was set aside for Extras - to
limit phone activity in that region of the band so that some of the digital
stuff can continue on those frequencies.
Although the thinking of government agencies is extremely unpredictable,
this doesn't look well for the ARRL's bandwidth proposal. If the FCC were
seriously considering limitations by bandwidth any time soon, it is unlikely
they would have gone to all the trouble to work out this plan, only to have
to revise it in the near future to accomodate subbands-by-bandwidth.
Looks like we'll soon be able to join the Canadians in their "AM Window" on
The change is expected to go into effect sometime in mid-November.
This message was typed using the DVORAK keyboard layout.
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