Received-SPF: none (google.com: owner-rsgb_lf_group@blacksheep.org does not designate permitted sender hosts) client-ip=195.171.43.25;
Message-ID: <31492244353D491FB5FB013621EC8C59@AGB>
From: "Graham" <g8fzk@g8fzk.fsnet.co.uk>
To: <rsgb_lf_group@blacksheep.org>
References: <PAEFLMFGBDKKCONLMLBIIECCEHAA.ganymede444@btopenworld.com>, <3E2191D6995647D48932529876C7636C@gnat> <53AC1579.29762.C84E42@mike.dennison.ntlworld.com> <53AC1307.9030109@gmail.com>
In-Reply-To: <53AC1307.9030109@gmail.com>
Date: Thu, 26 Jun 2014 14:06:08 +0100
MIME-Version: 1.0
Importance: Normal
Subject: Re: LF: RE: Summer Solstice Test report
Content-Type: text/plain;
	format=flowed;
	charset="iso-8859-1";
	reply-type=response
Content-Transfer-Encoding: 7bit
Sender: owner-rsgb_lf_group@blacksheep.org
Precedence: bulk
Reply-To: rsgb_lf_group@blacksheep.org

We also live in the  wrong  place , propagation  seems to  be  better  in 
the  south , most  marine  500  sets  only  run  100/200  watts  on 500k , 
the  emergency  sets  round 50 watts

Standard  Ae , marine  set up  has the  classic  40/60  ft  vertical 
section  and  120 ft  top , feed point  is  80 ft  above sea level   , the 
hull  is  steel  , evolved  'ideal'  Ae   1000  to  2000  miles  range 
expected  norm

Sea water  is  the  big  thing  , last  500k  dx  emergency  was  from 
south  to  north  pacific  , and that  was  after the  500 band  had  been 
removed  from  service  , apparently  the  ship  still  had the   radio 
room , it was  broken into  and  as a last chance , managed to  raise some 
one  on 500  - usa  I think

100 miles  of  land  makes a  big  difference  , I can  work  in GI/EI    no 
problem  , as  can G3KEV work  in to  EU  from the  east coast , I need 
about   250/300  watts  to  decode  OP4 via the  tween  web sdr  in the  day 
, that's  350 miles  , about  50 over  sea , conversely  50 watts  pep  ssb 
is  5/9  into  Belfast

One of the  problems  associated  with the  wspr decode , is strong 
carriers  in the  pass  band  , which  raise the  minimum  s/n decode  level 
, you  can see  that  when  a  strong  local station  runs  up ,  the  spots 
in its  locality  [75 mile radius] , higher  power levels  have  larger 
ranges ..    'we on 500  had  the  advantage  of  minimal  activity , so  DX 
decodes  where  more  achievable back then , wspr  was  designed  for  HF , 
where  high  level  ground  wave  signals  are  not  encountered at  range .

G,


--------------------------------------------------
From: "DK7FC" <73dk7fc@googlemail.com>
Sent: Thursday, June 26, 2014 1:33 PM
To: <rsgb_lf_group@blacksheep.org>
Subject: Re: LF: RE: Summer Solstice Test report

> Hello Mike,
>
> Am 26.06.2014 13:43, schrieb Mike Dennison:
>> Personally, I have been disappointed by the amount of DX received
>>   during darkness hours on 472kHz so far. It seems commonplace
>>   to receive stations out to Scandinavia and Italy, but little beyond.
>>   Yes, I have seen some transatlantic DX but nothing to match
>> the stories of worldwide openings reported by retired marine 500kHz
>> operators, or indeed what is availalable routinely on 160m. Is this
>> just lack of activity?
>>
>
> It is lack of RF power for many stations!
>
> Furthermore there is a big difference between 2200m and 630m regarding 
> propagation above sea water and above land. There have been just a few 
> WSPR decodes on 630m by russian RX stations while they are getting very 
> good results on 2200m. That explaines the advantage of living near the 
> sea. In other words, it should be relatively "easy" to get some TA 
> detections by stations living near the sea, however it is much harder to 
> get the same results when living a few 100 km distant from the sea...
>
> 73, Stefan
>
>
>