Re: LF: RE: Japan on 475 kHz.

[DK7FC <73dk7fc@googlemail.com>]

Hi Laurence,

JA to AK will be an interesting path and here regular detections will be 
possible, i guess. However, with 1W it will also be VERY rare i think.
About WSPR-15 on MF, so far we didn't really proof that the mode is to 
slow for the band. But i assume the "gain" will not be 9 dB like on LF. 
Maybe just 3 dB. In the early days of 630m i got this QRSS-10 reception 
spectrogram by KU4XR, 
https://dl.dropboxusercontent.com/u/19882028/MF/DK7FC_QRSS-10_476_KHz_12-28-2012.jpg 
which shows a blurry trace. Thus i think QRSS-180 or so is not useful. 
Maybe the same for WSPR-15 (?).
But actually we could do more QRSS-10 DX tests on MF! My grabber runs on 
QRSS3 but it can be slowed down on request :-)
73, Stefan

Am 23.12.2014 03:05, schrieb Laurence KL7 L:
> Im hoping that with lower flux in the coming years it will be possible - 
> certainly a few Eu stations have made to the  far East coast of China (and 
> further South) in past years so I think even with relative low ERPs it will 
> work on wspr2/15 or other visual digital modes - just got to get a good few 
> hours... :-)
>
> This is good news even with the odd technical restrictions
>
> on other bands JA1CGM is still making here on 136.174 qrss30 nightly or so even 
> under the worst of conditions
>
> Laurence KL7L
>
>    
> > On Dec 22, 2014, at 3:26 PM, "Hideho YAMAMURA"<pba01030@nifty.com>  wrote:
> >
> > 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
> > > >          
> >      
>