Message-ID: <3358AE4319E34ACF8C6BD530B01F96FA@GaryPC>
From: "Gary G4WGT" <g4wgt@tiscali.co.uk>
To: <rsgb_lf_group@blacksheep.org>
References: <74845C11BC3444D79B63A207E428BDE0@lindavideo>  <C4EE404465AB4B2C89B9809DE06DD805@oem92799c6e374> <1205576556-1330352309-cardhu_decombobulator_blackberry.rim.net-124445598-@b27.c11.bise7.blackberry> <005701ccf561$cd9d4250$0401a8c0@xphd97xgq27nyf> <098856018E3A46AB96BA9F9FC6C8FFCD@JimPC> <58AD05C381A841E9B1C5A0FEDD3E3043@lindavideo> <001901ccf604$72b33130$0401a8c0@xphd97xgq27nyf>
In-Reply-To: <001901ccf604$72b33130$0401a8c0@xphd97xgq27nyf>
Date: Tue, 28 Feb 2012 11:23:06 -0000
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Subject: LF: Re: Re: RE: Re: NDBs & WRC-12 LF band allocation
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Mal & All,

Mal wrote :-
***********************
Another problem for those with Ferrite rod and uProbe RX
antennas they will not hear a lot of these Beacons and therefore could well
be transmitting on top of them.
***********************
Surely (like me) when operators are transmitting they will receive on the 
same (Tx) antenna. This will make the system roughly compatible with other 
users on the band ie. same antenna in use at both sides, so usually if you 
can hear them then possibly they will hear you. Also there are published 
frequency lists for these in band NDB's, so have a list next to the 
operating desk (I have already).

Someone has already mentioned the ERP limits, presumably this has also been 
considered in respect of secondary use & interference to primary users.

73, Gary - G4WGT.


----- Original Message ----- 
From: "mal hamilton" <g3kevmal@talktalk.net>
To: <rsgb_lf_group@blacksheep.org>
Sent: Tuesday, February 28, 2012 10:33 AM
Subject: LF: Re: RE: Re: NDBs & WRC-12 LF band allocation


> Ken
> It could be tight at times especially for those with a good RX/Antenna
> therefore the ability to hear a good many NDB'S and try to squeeze into a
> vacant slot. Another problem for those with Ferrite rod and uProbe RX
> antennas they will not hear a lot of these Beacons and therefore could 
> well
> be transmitting on top of them.
> This was an unusual slot to pick for radio amateur use.
> de mal/g3kev
>
> ----- Original Message -----
> From: "Ken" <ken.h.wright@btinternet.com>
> To: <rsgb_lf_group@blacksheep.org>
> Sent: Tuesday, February 28, 2012 10:10 AM
> Subject: LF: RE: Re: NDBs & WRC-12 LF band allocation
>
>
>> Dear Jim, Mal, LF Group.
>> All I was trying to say in my message was 'if we could hear say 10 or 12
>> NDBs in the UK, would there be sufficient bandwidth left between each NDB
>> for us to safely operate using whatever modes we are assigned' Sorry if I
>> caused any confussion.
>>
>> 73s
>>
>> Ken
>>
>> M0KHW
>>
>> -----Original Message-----
>> From: owner-rsgb_lf_group@blacksheep.org
>> [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of James Moritz
>> Sent: 28 February 2012 00:03
>> To: rsgb_lf_group@blacksheep.org
>> Subject: LF: Re: NDBs & WRC-12 LF band allocation
>>
>> Dear Mal, Ken, LF Group,
>>
>> G3KEV wrote:
>> >The band should be licensed for CW operators only so that they could
>> >recognize and read the CW  beacons and AVOID >them.
>>
>> One does not need to be a morse code expert to realise there is a strong
>> signal repeating  the same dots and dashes 24 hours a day on a particular
>> frequency. One just needs a little common sense...
>>
>> >Has OFCOM thought of this.  Neither should there be any amateur
> unattended
>> >BEACONS to jam the Primary user >Beacons even unintentionally.
>>
>> Whether the transmission is a "manual" QSO or automated, or if an NoV for
> an
>>
>> unattended beacon was being applied for, the important thing for the
> amateur
>>
>> is to be aware of nearby NDBs and avoid transmitting on their
> frequencies -
>> this is a matter of  observation and advance planning, not operating. If
> a
>> couple of amateurs are yakking away about the WX on a NDB frequency, in 
>> CW
>> or any other mode, there is no way that the NDB will be able to break in
> at
>> the end of one over and say "excuse me chaps, but there are aircraft
> trying
>> to get a bearing on this frequency; would you mind QSYing - thank you so
>> much"  ;-)
>>
>> Think about this from the Primary User's point of view - if someone
>> navigating an aircraft sets their ADF receiver to a particular beacon
>> frequency and hears an assortment of amateur-generated morse code mixed 
>> up
>> with the beacon ID, this is likely to cause confusion or error. So there
> is
>> a strong argument for amateurs not to use morse code at all in this
>> frequency range. It would be better to use totally different types of
>> transmission that would not be confused with a NDB beacon signal.
>>
>> Cheers, Jim Moritz
>> 73 de M0BMU
>>
>>
>>
>>
>
>