Message-ID: <02a901cb05bb$695236d0$0201a8c0@Clemens04>
From: "Clemens  Paul" <cpaul@gmx.net>
To: <rsgb_lf_group@blacksheep.org>
References: <657E7065AC4C454AB63F6C7C2FF043F6@Black> <AANLkTimpT_apwHXR97olUxilu3D_3F3ZfGx0Mj2Uf99o@mail.gmail.com> <003101cb04c2$0913cc10$0401a8c0@xphd97xgq27nyf> <1607287044.1492139.1275754813942.JavaMail.fmail@mwmweb034> <BF4A524700075746A6467658DFC7102C5107CB1257@ICTS-S-EXC2-CA.luna.kuleuven.be> <38A51B74B884D74083D7950AD0DD85E82A1C24@File-Server-HST.hst.e-technik.tu-darmstadt.de> <7.0.1.0.1.20100606111158.018277a8@magma.ca> <Pine.LNX.4.64.1006061604470.29015@plato.ucs.mun.ca>
Date: Sun, 6 Jun 2010 23:01:16 +0200
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Subject: Re: VLF: RX stations in Canada and US?
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Hi Joe,

from what I can find in the web it tunes down to (only) 15kHz.
That's probably because  below 15kHz synthesizer sideband noise would
be an issue.
My Sony CRF-1 tunes down to zero Hertz but you can
hear the increasing synth. noise below 15kHz .
But it's still possible to receive the three alphas at ca.12kHz and ca.15kHz.
Maybe when using the broadest filter with 8kHz you can get usable reception
at 8,97kHz.
For a first try I would look for the alphas at ~12kHz.
OTOH, >15kHz you can expect an excellent performance with this rx.

73
Clemens
DL4RAJ 


----- Original Message ----- 
From: <jcraig@mun.ca>
To: <rsgb_lf_group@blacksheep.org>
Sent: Sunday, June 06, 2010 8:38 PM
Subject: Re: VLF: RX stations in Canada and US?


> Hi Bill, Group.
> 
> Just returned from a one week trip inland (Ottawa).  Yes, I'm near St 
> John's and have acquired an ITT mackay 3031A which might be satisfactory 
> for VLF RX. Any comments on the suitability of this RX would be 
> appreciated.
> 
> 73 & TNX
> Joe VO1NA
> 
> On Sun, 6 Jun 2010, Bill de Carle wrote:
> 
>> At 07:45 AM 6/6/2010, Stefan/DK7FC wrote:
>> [..]
>>> What about the canadian stations? These are in the shortest distance to EU 
>>> and will become a very important factor in some months when the QRN levels 
>>> decrease. Are there already stations who permantently monitor the dreamers 
>>> band (not the whole VLF) with a suitable RX system? Means, not only copying 
>>> the ALPHAs by ear but having a SLOW QRSS/DFCW window where DFCW-600 or 
>>> DFCW-6000 can be displayed. Here, it makes no sense to monitor the ALPHAs 
>>> and 8,97 kHz in e.g. 4 Hz FFT bandwith, what we need is 4 mHz! So, that one 
>>> DFCW element takes 10 minutes. Another important step is to have a STABLE 
>>> soundcard sample rate. This is well performed in the latest SpecLab 
>>> version. Alternatively a GPS synchronisation  or so is necessray!
>> [..]
>>> What do the canadians or US stns think about that? Any REAL interest?
>>
>> I have the necessary frequency stability/accuracy either already in place or 
>> easily arranged and I'm certainly interested, but unfortunately I live inland 
>> about 1000 miles from the East coast of Canada (the best Rx location would be 
>> somewhere around St. Johns Newfoundland).  Nevertheless, I'll see if I can 
>> receive the Alpha signals for a start.  I've been monitoring your experiments 
>> and you guys have me all excited about this VLF stuff!
>>
>> 73,
>> Bill VE2IQ
>>
>>
>>


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