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Re: LF: RE: Japan on 475 kHz.

To: [email protected]org
Subject: Re: LF: RE: Japan on 475 kHz.
From: DK7FC <[email protected]>
Date: Tue, 23 Dec 2014 14:03:20 +0100
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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"<[email protected]>  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: [email protected]
[mailto:[email protected]] On Behalf Of DK7FC
Sent: Monday, December 22, 2014 7:40 AM
To: [email protected]
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





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