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Unfortunately
Modern data modes are / can be
frequency agile and tend to jump about
within defined boundaries , so the rx end
has to know where to set the rx dial
to intercept them
Many of the transmissions will be under the
noise level , as we have seem with 'invisible
ros' , Stefan's 'unglaublich langsam WSPR' will also
run under the noise floor and require a defined
slot to function (10 x wider than Opera
though) ..
As to what
new users of the band actually 'do' I think
is going to be modulated (pun) by the
activities of the users now and the leader writers
in the magazines .. if 'we' project a image of
beacon's , then that will attract beacon
users .. that is in 'our' hands , one
thing is sure , very few will be following
events on ya-boo or this email group
End of a era
...
G..
Sent: Friday, September 28, 2012 3:10 PM
Subject: Re: LF: RE: 630m Band Plan
Dial frequency means nothing for those of us in CW rx
mode. I prefer the actual RF frequency to be specified and those interested can
work out the Dial frequency for SSB mode.
g3kev
----- Original Message -----
Sent: Friday, September 28, 2012 1:40
PM
Subject: Re: LF: RE: 630m Band Plan
Hello all,
Maybe we have to differnciate what people do
understand as "band plan":
A typical band plan leads some OMs to
complain about others like "Hey you have done QRSS on 47x.x kHz but this
is the WSPR slot!" which is nonsense for me. Here "band plan" is treated as a
law where people have to stick on. And this is what we do not need from
my point of view.
However, if you understand "band plan" as a useful
hint for newcomers (RX- and TXwise) where it may be useful to listen or to
call e.g. in CW or where to set the "dial" for WSPR decoding, then i
cannot find something bad on it. If we start to collect our experiences why it
is useful to use that QRG for that mode, then why not. But many countries,
experiences and time should form this plan, not only the German
amateurs, just because we are the first ones who actually use the band. That
means, probably the paln will form itselfe!
Furthermore this 630m band
is different to the typical HF bands and even LF. We have different NDBs
inside the band which cause QRM to us and we can cause QRM to them. This
should be avoided of course. If 630m will become a world wide allocation in
some time i can hardly imagine that the world will spend significant interest
to a "B31 band plan". The EUs NDBs are not really interesting for Japan and
maybe Japan or other IARU contries will have other noise sources on other
frequencies in the band.
I can absolutely not understand why the lowest
3 kHz should be reserved for CW. Is there a real understandable reason for
this? Just because the lower parts of any HF band is reserved for CW? Please
let me or us know!
From my point of view, a real argument is: CW is
(probably) the only mode on 630m where the OM/YL does really listen into the
noise. This is mostly done with a 500Hz or maybe 250 Hz CW filter. Yes, there
are 100 Hz software based CW filters but it is no fun to listen to CW through
such a filter... So it is important to have some 100 Hz of free spectrum
arround a CW calling frequency. Think about homebrewers who use a homemade CW
filter which has not the performance of a proffessional HF TRX
filter...
For 472.5 kHz this is OK but the next and only really clear CW
QRG is 476.5 kHz. So why not saying "472.5 kHz is the first calling frequency
where OMs can park their RX to listen for calling stations" and "If 472.5 kHz
is occupied by a calling station or a QSO, then QSY to 476.5"? This would be a
useful hint but not a law!
About QRSS/DFCW i think one can use a
frequency which is close to the carrier of a NDB: First, there will be
no CW station close to the carrier. Second, the QRSS/DFCW signal is not
affected by the presence of the NBD carrier. Third, the radio operator in an
aircraft listening to the NDB will not hear the QRSS signal because it appears
at very low frequencies on the speaker, e.g. 40 Hz. So no one is negatively
affected and we can all live in peace :-)
Concentrating the digimodes
on the upper part of the band is not bad i find.
Lastly the active
stations will define where the center or "dial" frequency of which mode will
be. All the active stations. BTW the few grabbers and Twente WEB SDR are
actually helping to coordinate active stations in the first time of the
band..
Let's enjoy it :-)
73, Stefan/DK7FC
Am
28.09.2012 09:36, schrieb Holger 'Geri' DK8KW DI2BO W1KW:
Dear all,
I agree with most who say that there is no deed at this point for any
rigid plan, my only, very preliminary suggestion would be: let us keep the
lower few kHz for regular CW, QRSS in the middle and digital modes above,
say 477 kHz. While it may be necessary to agree on certain frequencies (such
as 477 kHz "dial" for OPERA) I would keep the remaining allocations open,
each local locations is different. Also, in the future with more activity I
am sure we don't need any CW calling frequency as we will do random
contacts, same as on every other ham band.
Just my 2 €-cent.
Vy 73
Geri, DK8KW & DI2BO
Dear Klaus,
in my opinion it
is far too early for a rigid band plan.
At this moment only few countries
are active on 472-479kHz, in 2013 things will
change.
Let's wait until then to decide
a. if we really need a rigid band plan
b. what it (eventually) will be
73, Rik ON7YD - OR7T
Dear All
as a first proposal for discussion we present a "plan"
that we coined the "B31 Band Plan for 630m". The name derives from the DOK
to which all who shared ideas, belong.
Just to state it once more: it
is a first basis and proposal and those who have an interest in operation
between 472kHz and 479kHz (up to now the slot allocated by the BuNetzA to
German hams) are invited to agree, discuss or provide better
ideas.
Several hams already provided specific proposals which were
incorporated.
We deliberately did not detail too much, as we do not
think, that all can be fixed prior to actual demand.
Please see attached gif-file.
1. A CW slot from 472kHz to 475kHz (=3kHz).
2. Within that, a
region for beacons (472,000kHz to 472,150kHz) followed by a region for
Slow CW (472,150kHz to 472,300kHz).
3. For TA-CW DX traffic or other
long-haul DX, a calling frequency shall be established at
472,600kHz.
4. For other CW traffic, another calling frequency (if the
necessity exists) shall be established in the upper region of the CW
allocation at 474,750kHz (474,500 occupied by "SA").
5. The frequency
472,500kHz will not be allocated for special use (at least for the time
being), as a continuous carrier is audible 24/7 throughout DL.
6. A
slot for Digital Modes from 475,0kHz to 479,0 (= 4kHz).
7. Today it is
much too early to decide which digital modes will be used on 630m. We
propose to leave this open for the future. WSPR (474,200kHz Dial USB),
OPERA and ROS (477,000kHz DIAL USB) have established themselves on the
shown frequencies. Some other modes that may be useful for MW but can not
yet be used (e.g. JT65HF) because they allow no suitable frequency
selection.
8. Digital Modes should not overlap each other (minor
relocations may be necessary).
9. Whether or not the shown "protection
zones" of e.g. +/- 50Hz around active NDB frequencies are necessary or
not, ist still being discussed.
10. No further stipulations will be
given.
Walter DJ2LF, Roland DL3NDR, Klaus DJ6LB
NB (DJ6LB): Upon request I provide (via separate mail) a picture with
better resolution .
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