From: "Hideho YAMAMURA" <pba01030@nifty.com>
To: <rsgb_lf_group@blacksheep.org>
References: <CAKvcm2e9gshSiL4kSM0FQfzWZtpgX2CpVs=5_eD7Yi5gt6RDbQ@mail.gmail.com> <00b601d01d18$87884620$9698d260$@nifty.com> <54974C40.9040309@gmail.com>
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Date: Tue, 23 Dec 2014 09:23:41 +0900
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Subject: RE: LF: RE: Japan on 475 kHz.
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Stefan,

Thank you for the diagram, nice picture,
and that you don't have complaints


You have a BPF. It should help a lot, for low harmonics.
And your TX is very compact. I was impressed.

> Unfortunately it is not so likely to make QSOs between
> DL and JA on 630m but maybe some QRSS-10 with some luck :-)
I hope so.

73

 Hideho YAMAMURA/JF1DMQ


> -----Original Message-----
> From: owner-rsgb_lf_group@blacksheep.org
> [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of DK7FC
> Sent: Monday, December 22, 2014 7:40 AM
> To: rsgb_lf_group@blacksheep.org
> Subject: Re: LF: RE: Japan on 475 kHz.
> 
> Hello Hideho,
> 
> Wow, congrats for getting the new band! Hope there will be never ending
> activity on the band. Unfortunately it is not so likely to make QSOs between
> DL and JA on 630m but maybe some QRSS-10 with some luck :-)
> 
> Am 21.12.2014 13:20, schrieb Hideho YAMAMURA:
> > 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),
> >
> Never heared about BC problems as long as we have the band here.
> 
> > and what care do you take ?
> >
> Avoiding significant harmonics.
> 
> > LPF, what kind, other means ?
> >
> For e.g. a 100W PA i'm using T80-2  cores. (T106-2 would have been better
> though).
> > How much is your harmonic attenuation ?
> Don't know but obviously enough :-)
> >   or filter attenuation ?
> > Information highly appreciated,
> >
> This is the circuit of a simple compact high effective class D PA running
> at "12V" (13.8V), producing up to 100W RF power. It has a 4f input, so you
> can use a 160m transmitter (2...4W RF). 1900 kHz ==> 475 kHz. Maybe useful
> for beginners :-)
> https://dl.dropboxusercontent.com/u/19882028/MF/100W-475KHZ-PA.png
> https://dl.dropboxusercontent.com/u/19882028/MF/DK7FC%20472%20kHz%20PA
> %2015W%2B100W.JPG
> 
> 
> Good luck for your first experiments! :-)
> 
> 73, Stefan/DK7FC
> 
> 
> > BTW, I myself, is not prepared for 630m, yet.
> >
> >   Hideho YAMAMURA, JF1DMQ
> >