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Re: LF: RE: 630m Band Plan

To: [email protected]
Subject: Re: LF: RE: 630m Band Plan
From: Stefan Schäfer <[email protected]>
Date: Fri, 28 Sep 2012 15:40:01 +0200
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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


On 28.09.2012, at 07:47, Rik Strobbe <[email protected]> wrote:

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

 


Van: [email protected] [[email protected]] namens [email protected] [[email protected]]
Verzonden: vrijdag 28 september 2012 0:18
To: [email protected]
Onderwerp: LF: 630m Band Plan

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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