Received-SPF: neutral (google.com: 193.82.116.20 is neither permitted nor denied by best guess record for domain of owner-rsgb_lf_group@blacksheep.org)
Message-ID: <46633470.1020408@m0dts.co.uk>
Date: Sun, 03 Jun 2007 22:36:48 +0100
From: "Rob, M0DTS" <rob@m0dts.co.uk>
User-Agent: Thunderbird 1.5.0.12 (Windows/20070509)
MIME-Version: 1.0
To:  rsgb_lf_group@blacksheep.org
References: <466297FE.29620.598C297@localhost> <4662B25B.18265.16679D6@dave.davesergeant.com> <4662C157.7080901@m0dts.co.uk> <001901c7a61c$522ca0a0$0300a8c0@lark>
In-Reply-To: <001901c7a61c$522ca0a0$0300a8c0@lark>
Subject: Re: LF: Re: 136kHz Getting started..
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

Thanks for the tip on the loop tuning, will try that out tomorrow and 
see the difference it shows.

The mixer and amp is just a temporary setup to see if i would be lucky 
enough to see any signals....hmm
As in the other post i am receiving with my ic-706IIG now and seems a 
bit better for spurious than the wideband mixer!
I'l make a crude filter tomorrow for the input and hopefully cure the 
main breakthrough probs but i am now hearing things...

I'l try Rik's site sometime when qsl.net actually responds.. anyone else 
notice it is really slow these days?!
I'm using spectrum lab for the monitoring, have used it as a general 
monitor for all souncard stuff for a while now and very impressed., i 
also use winrad for sdr and weak sigs etc..

Are there any other forums on the net for LF and VLF, seem very hard to 
find any meeting place for common interest in 136KHz like the handy 
on4kst setup for eme/vhf and up skeds etc..

Thanks for your web link too Alan, will have a look through later.....


Rob

Alan Melia wrote:
> Hi Rob as dave said it is quiet at the moment. I found attaching a gen to a
> loop can give silly answers, and you can finish off far enough off resonance
> to seriously affect the signal levels. I connect my generator to a small
> coil about 8in diam with about 8 turns or any-old-wire. Set the two loops in
> the same plane with the exciter look a couple of diameters of the big loo
> along the axis. Then peak the main loop. I get quite a bit signal from DCF39
> on 138.83 here the field strength is about 1mV/meter and that vives me an
> S9+32dB signal from a 12m high Inverted L.. You will get a little less on a
> loop but not that much less with a large one.
> Most of the "accumulated wisdom" is summerised on a couple of big tutorials
> on Rik Stobbe's web site, and he has lots of links to other projects
> information
> http://www.qsl.net/on7yd/136khz.htm
>
> It occurs to me that depending on your location you may need a low-pass
> filter between your loop and the rx to keep out MW  BC stations, the 612 is
> not the best intermod performer, but is adequate if protected sufficiently.
>
> The use of a PC "waterfall" program (ARGO is popular, free, and easy to use,
> and works with most on-board sound cards I think) is very useful for
> identifying QRM and also spotting weak signals.
>
> Welcome to LF ( which stands for Lotsa Fun !!)
> Alan G3NYK
> http://www.btinternet.com/~alan.melia/index.htm
>
>