The same here, I have worked on 160m CW more than 100
different JA calls, especially in the beginning when they was allowed only on
the short segment 1907.5 to 1912.5 kHz (from the 1991 year if my memory is not
too bad...). It was great fun moments indeed !
I agree with you, Mal. For DX, the Propagation on both MF
BANDS 160 and 630 meters similar. The only diference is the ERP power, because
on 630 m the standard ham antennas have not 100 % of efficiency, HI.
Best 73 de Andy F6CNI.
From: mal hamilton
Sent: Monday, December 22, 2014 5:01 PM
Subject: LF: Re: Japan on 475 kHz.
Over the years I have worked many JA stns on 160 metres CW and look forward
to doing the same on 630 metres
Propagation on both MF BANDS similar
From: Dimitrios Tsifakis
Sent: Sunday, December 21, 2014 11:57 PM
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
> Do you have any BC QRM problem ? (I mean making interference, not
> 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
5 W EIRP and operators do transmit at that level. My guess is that
lack of interference complains is partly because of the generally
practice on behalf of the few amateurs that are making use of the
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