From: DK7FC <73dk7fc@googlemail.com>
Message-ID: <54996818.10905@gmail.com>
Date: Tue, 23 Dec 2014 14:03:20 +0100
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3
MIME-Version: 1.0
To: rsgb_lf_group@blacksheep.org
References: <CAKvcm2e9gshSiL4kSM0FQfzWZtpgX2CpVs=5_eD7Yi5gt6RDbQ@mail.gmail.com> <00b601d01d18$87884620$9698d260$@nifty.com> <54974C40.9040309@gmail.com> <006101d01e46$b48196c0$1d84c440$@nifty.com> <BLU405-EAS3264FE3086EDCDFE4D623E6CF570@phx.gbl>
In-Reply-To: <BLU405-EAS3264FE3086EDCDFE4D623E6CF570@phx.gbl>
Subject: Re: LF: RE: Japan on 475 kHz.
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Sender: owner-rsgb_lf_group@blacksheep.org
Precedence: bulk
Reply-To: rsgb_lf_group@blacksheep.org
Status: O

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
>>>>          
>>
>>      
>