From: "Hideho YAMAMURA" <pba01030@nifty.com>
To: <rsgb_lf_group@blacksheep.org>
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In-Reply-To: <CAKvcm2fTDHPt9sDOdFwFZiAimAme63eK_t=tH0+xhUax7iLdAg@mail.gmail.com>
Date: Tue, 23 Dec 2014 09:08:50 +0900
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Subject: RE: LF: RE: Japan on 475 kHz.
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Dimitris,

Nice that you don't hear complaints.

> I have not heard of any complains about interference to the MW BC service
That's nice.

> I use a low pass filter which ensures that the harmonics are -50 dBc or
> lower. I think the tuned antenna also helps with not radiating too much
My quick calculation resulted in -120dBc necessary, to reduce QRM to adjacent houses,
 (I may be wrong)., and I am thinking how to make it.

> .... in Australia. We are allowed
> 5 W EIRP and operators do transmit at that level. 
We should try reception first.

73s

Hideho YAMAMURA/JF1DMQ


> because of operation on 630m here in Australia. We are allowed
> 5 W EIRP and operators do transmit at that level. My guess is that the lack
> of interference complains is partly because of the generally good practice
> on behalf of the few amateurs that are making use of the band and partly


> -----Original Message-----
> From: owner-rsgb_lf_group@blacksheep.org
> [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Dimitrios
> Tsifakis
> Sent: Monday, December 22, 2014 8:58 AM
> To: rsgb_lf_group@blacksheep.org
> Subject: Re: LF: RE: Japan on 475 kHz.
> 
> Hi Hideho san,
> 
> Thank you for the update. I am glad to hear that even though you have all
> these tough restrictions, Japanese amateurs are planning portable
> operations in the new band!
> 
> 
> > I would like to know the situations in the already operating stations.
> > Do you have any BC QRM problem ? (I mean making interference, not
> > receiving), and what care do you take ?
> 
> I have not heard of any complains about interference to the MW BC service
> because of operation on 630m here in Australia. We are allowed
> 5 W EIRP and operators do transmit at that level. My guess is that the lack
> of interference complains is partly because of the generally good practice
> on behalf of the few amateurs that are making use of the band and partly
> because of limited audience of the MW BC stations.
> 
> > LPF, what kind, other means ?
> > How much is your harmonic attenuation ? or filter attenuation ?
> > Information highly appreciated,
> 
> 
> I use a low pass filter which ensures that the harmonics are -50 dBc or
> lower. I think the tuned antenna also helps with not radiating too much
> harmonics power.
> 
> 73, Dimitris VK1SV