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Re: LF: RE: Japan on 475 kHz.

To: [email protected]
Subject: Re: LF: RE: Japan on 475 kHz.
From: DK7FC <[email protected]>
Date: Sun, 21 Dec 2014 23:40:00 +0100
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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




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