Received-SPF: neutral (google.com: 195.171.43.25 is neither permitted nor denied by best guess record for domain of owner-rsgb_lf_group@blacksheep.org) client-ip=195.171.43.25;
Message-ID: <C409F6F8EDAD4EC3838E46A0F42BC1E2@AGB>
From: "Graham" <g8fzk@g8fzk.fsnet.co.uk>
To: <rsgb_lf_group@blacksheep.org>
References: <CAKvcm2f-gd838h_1dCkw_=izkbnVG+-Tg2dS9Q7FV6TSVk=vJQ@mail.gmail.com><PAEFLMFGBDKKCONLMLBIIEKCEBAA.ganymede444@btopenworld.com> <CAKvcm2eUtg+PM_88BvSeyxWHCsGGYWZB_j5chr9THimVghZmcA@mail.gmail.com>
In-Reply-To: <CAKvcm2eUtg+PM_88BvSeyxWHCsGGYWZB_j5chr9THimVghZmcA@mail.gmail.com>
Date: Wed, 3 Jul 2013 01:00:26 +0100
MIME-Version: 1.0
Importance: Normal
Subject: Re: LF: WSPR-2 on 630m last night
Content-Type: text/plain;
	format=flowed;
	charset="iso-8859-1";
	reply-type=original
Content-Transfer-Encoding: 8bit
Sender: owner-rsgb_lf_group@blacksheep.org
Precedence: bulk
Reply-To: rsgb_lf_group@blacksheep.org
Status: O

We  found 500 carried  much better than  top  band , by  running   qrss 
beacons  and  inducing   'Beacon Bedlam' , south  of  Watford   gap ....

which  was quite  handy as it  left  us in the  frozen  north  to  get  on 
with  some  real  experimental  work

http://rosmodem.wordpress.com/2010/05/01/first-qso-on-500khz-using-ros-30-april/

Oh how things  changed  ... but you  can  see  the  makings  of the  100Hz 
MF mode  in the  text , to accommodate  100 Hz telegraphy  :)

http://rosmodem.wordpress.com/2010/05/14/first-qso-with-ros7-mf/

Closely followed by

East <> West

http://rosmodem.wordpress.com/2011/02/14/the-blue-ribbon-fastest-live-data-to-cross-the-atlantic/


West >< East   still  qso  data  record distance  ?

http://groups.yahoo.com/group/digitalradio/message/41297


G  :-)


http://www.youtube.com/watch?v=gVdOQvx379Y


--------------------------------------------------
From: "Dimitrios Tsifakis" <dtsifakis@gmail.com>
Sent: Wednesday, July 03, 2013 12:10 AM
To: <rsgb_lf_group@blacksheep.org>
Subject: Re: LF: WSPR-2 on 630m last night

> Hi Dave,
>
> There are no problems here operating portable on 630m. The only
> problem with portable operation is that it is hard to provide a low
> impedance ground system. At home, I have a number of copper plated
> rods and the impedance of my antenna is about 20 ohm, which is great.
> When /P though, this figure is always much higher, and that ain't
> because the radiation resistance has gone up miraculously ;-)
>
> By the way, I am always amazed by the distance covered by such low
> radiated power. Surely this has to do with 630 m but also with the
> WSPR protocol. I routinely reach Tasmania, Brisbane and Adelaide with
> my low power beacon, and the are all just shy of 1000 km away. I have
> also reached a station in Alice Springs, right in the middle of the
> country, and that's closer to 2000 km. If there were more listeners
> further away, I am sure they would report reception too.
>
> 73, Dimitris VK1SV
>
>
> 2013/7/3 Dave G3WCB. <ganymede444@btopenworld.com>:
>> Hi, Dimitris, LF.
>>
>> Thanks for posting an interesting article on QRP WSPR. I've been
>> experimenting along similar lines, but in my case I'm using a QRP Labs
>> Ultimate 2 kit, which uses the same DDS as your TX, but the WSPR is
>> generated by an ATmega168 AVR microcontroller. No PC necessary.
>>
>> With an RF output of about 2 watts into a 5m high "tee" antenna with a 
>> 20m
>> top, I've been consistently spotted at 363km range during darkness by 
>> PA3ABK
>> and PA0A at 499km, with just one spot by DG3LV at 791km range.
>>
>> My ultimate aim is to assemble a portable WSPR station and hike out to a
>> remote location, for example Dartmoor, in Devon. I'll need to check to 
>> see
>> if the terms of my licence NOV allow portable operation on 630m first ;-)
>>
>> 73, Dave G3WCB IO91RM
>>
>> -----Original Message-----
>> From: owner-rsgb_lf_group@blacksheep.org
>> [mailto:owner-rsgb_lf_group@blacksheep.org]On Behalf Of Dimitrios
>> Tsifakis
>> Sent: 02 July 2013 00:39
>> To: rsgb_lf_group@blacksheep.org
>> Subject: Re: LF: WSPR-2 on 630m last night
>>
>>
>> Hi Stefan,
>>
>> VK dominates WSPR in numbers but not in records -  yet!  :-)
>>
>> I have been busy with university homework but that's finishing now, so
>> I will get busy with radio again. My latest experiment is a very
>> simple WSPR-2 Arduino/DDS/Class-E transmitter. The web page below is
>> work in progress:
>>
>> http://people.physics.anu.edu.au/~dxt103/472/wspr_tx/
>>
>> I have also been doing some tests with a very restricted antenna just
>> to prove the point that a super large antenna is not the only way to
>> enjoy the new low bands. Last weekend I did a quick test with the WSPR
>> beacon from my block of land outside Canberra, using the earth dipole
>> antenna. I was able to cover 180 km with only 5 W and I know what to
>> do to improve this. Can't beat a ground antenna when it comes to
>> convenience!
>>
>> 73, Dimitris Vk1SV
>>
>> 2013/7/2 Stefan Schäfer <Stefan.Schaefer@iup.uni-heidelberg.de>:
>>> Hi Dimitris,
>>>
>>> Am 01.07.2013 06:02, schrieb Dimitrios Tsifakis:
>>>
>>>> Not only it's winter, but I noticed that VK dominates WSPR on 630m on a
>>>> regular basis :-)
>>>
>>> Are you sure? :-)
>>>
>>>
>>>> There are plenty of stations monitoring, from all over the country,
>>>> including, from time to time, one from Perth, Western Australia.
>>>
>>> Yes, i see. It is very nice to see so much activity from down under. But
>>> where are all the ZL stations?
>>>
>>>
>>>> So far, we haven't managed to repeat the VK1DSH->F6CNI record but
>> perhaps,
>>>> if the activity keeps to a high level, it's a matter of time until an 
>>>> EU
>>>> station is received here.
>>>
>>> That was a very rare event i guess. But we'll try. Thanks for the
>>> motivation. BTW soon the LF DX season starts again and Edgar has done a
>> lot
>>> of effort to prepare for a new #3 DX WR on LF. I'll try to transmit as
>> much
>>> as possible, either on MF or on LF. Actually i should really build an
>>> automatic antenna switch. Then i can send a MF WSPR 2 block between the
>> gap
>>> of 2 LF DFCW-180 elements :-)
>>>
>>> Have fun and good luck!
>>> Any new /p experiments from your side? And how does the tube PA perform
>> now?
>>>
>>> 73, Stefan/DK7FC
>>>
>>>>
>>>> 73, Dimitris VK1SV
>>>
>>>
>>
>>
>