Message-ID: <9A31553C0F7B4A338F7D2040D20D3DDB@AGB>
From: "Graham" <g8fzk@g8fzk.fsnet.co.uk>
To: <rsgb_lf_group@blacksheep.org>
References: <20100805185619.DRQ8W.3140581.root@mp14>
In-Reply-To: <20100805185619.DRQ8W.3140581.root@mp14>
Date: Fri, 6 Aug 2010 01:08:55 +0100
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Subject: Re: LF: Fwd: CMSK Beta released
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As  far as I know , only wspr  and  ros-mf have  the  ability to  drive  a 
pic/dds  vfo , with  only    mf-1/7  giving  a  tailored mf  qso  mode ?

mf-1  is  quoted round  -35 db noise floor , in tests  with my  500K 35 ft 
'pine  needle'  Ae  , over a 350  mile daylight path  (1200 hrs)  150  watts 
carrier produced  100% decode via the  Delft web-sdr , MF-7  has a   8 dB's 
degrade , so apart  from the  odd  lock, I did not  have 'quite'  an extra 8 
dB in the  pa ..  , nothing was decoded , in a sequential  test,  wspr 
stopped   decoding  round    2 to 3 dB's  higher than  mf-1

Test  set  up

TX>> P4 / 4 gig >  Delta 4 sound  card  > MA1723  exciter  > 10 dB 1 dB 
step atten   Skanti  TRP8000  250 W linear >  R&S  URV35 / 200 watt T power 
head > 150 watts carrier > 35 ft top load vert >ref power round 1 watt in 
150

RX>> Delft  web-sdr > second  p/c via  web


After a  ad hock  qso  on 137 with  myself,  The  first  real outing of mf-1 
on 137 by Gray also  produced a  surprise daylight   decode  from  Paris 
with  150  watts  Ae  feed  to  short top  loaded vertical  array ,

Cannot here  it , cannot  see  it  , but it  decodes 100 % , ' Invisible 
Ros' as one  our  elder statesman refers to it .. worth a try over the other 
side ?

G .

--------------------------------------------------
From: <w1tag@charter.net>
Sent: Thursday, August 05, 2010 11:56 PM
To: <rsgb_lf_group@blacksheep.org>
Subject: Re: LF: Fwd: CMSK Beta released

>
> Roger,
>
>> I'm expecting great things with WSPR on 137kHz in the coming months, so 
>> hope
>> I'm not going to be disappointed and hope many others will join me on 
>> WSPR
>> when not busy making CW QSOs.
>
> Please don't allow my remark to kill any interest in WSPR at 137 kHz! My 
> results with receiving at home have been fine at 500 kHz, and not so fine 
> at 137 kHz. At first I suspected Loran lines, but that turned out not to 
> be the issue. It appears to be due to AC-related noise in my neighborhood, 
> probably largely from switch-mode supplies. My own home is not the 
> source -- I'm guessing it's from a particular neighbor who would be very 
> uncooperative. As she's fond of taking people to court, I'll omit the 
> details in a public forum!
>
> The noise level still permits the use of weak-signal modes like QRSS, 
> WOLF, and so forth, but WSPR just seems to hate this stuff. W1VD has a 
> much quieter site, and has not experienced the problem.
>
> So, your results may vary, and hopefully your winter season will be 
> WSPR-quiet.
>
> John, W1TAG
>
>