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Re: LF: RE: Japan on 475 kHz.

To: [email protected]
Subject: Re: LF: RE: Japan on 475 kHz.
From: Dimitrios Tsifakis <[email protected]>
Date: Mon, 22 Dec 2014 10:57:44 +1100
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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

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