LF: Re: 137.675kHz QRSS testing

[Roger Lapthorn <rogerlapthorn@gmail.com>]

Very many thanks for the screen shots Mike. I assume that the time stamp is the RHS of the Argo screen? If so, I agree the signal disappears at the right time (2.45pm) on the last screenshot sent (not the one attached here). 

The message period at 7 mins (actually 9 mins 7 secs between each message sequence starting) corresponds exactly to my "G3XBM JO02dg" in QRSS3 followed by "G3XBM" at 10wpm. Like you, I cannot see any CW characters, just the transmission sequence starting and ending. 

So, yes, I believe this is pretty certainly it is my signal you are seeing. Amazing that such low power into a couple of earth rods in the ground can be detected so far away. 

Do you have any idea what field strength this signal level corresponds to? Also, how many more dBs do you think I need for you to positively identify the QRSS3 signal?

Will let you know when I have more ERP as I'd like to repeat the test then.  Thank you so much!


73s
Roger G3XBM

On 24 August 2010 15:24, Mike Dennison <mike.dennison@ntlworld.com> wrote:

Roger,

Having switched off three firewalls I have managed to get my
computers to talk to each other. Here, then, are some of the pics.

The first is set to QRSS3 and you can see the level of noise around
this frequency. I have studied the 20 or so pics I have like this but
cannot see anything that could be identified without doubt as a Morse
letter.

The others are set to QRSS30 which of course provides a substantial
improvement in signal/noise ratio, though the individual letters are
not readable.

You can see the sequences of some 7.5 minutes on and about 1 minute
off, and the keying sidebands above and below.

On the last pic you can calculate that the signal switched off about
2.46pm. By the way, the time stamp is correct but the date is a week
out - must engage brain this end.

Does that confirm reception?

73 de Mike
=========

> The 137.675kHz QRSS3 beacon was switched off at 2.45pm this afternoon
> Mike.
>
> 73s
> Roger G3XBM
>
> On 24 August 2010 10:56, Roger Lapthorn <rogerlapthorn@gmail.com>
> wrote:
>
> > Many thanks Mike.
> >
> > Back to the garage to continue the transverter build....
> >
> > 73s
> > Roger G3XBM
> >
> >
> > On 24 August 2010 10:42, Mike Dennison <mike.dennison@ntlworld.com>
> > wrote:
> >
> >> Roger,
> >>
> >> I am monitoring now. I will do regular screen captures and let you
> >> know this afternoon if I saw anything.
> >>
> >> Mike
> >> ====
> >>
> >>
> >> > You mentioned last week that you might be able to take a look for
> >> > my QRPp signal on 137.675kHz QRSS3. ERP is currently in the 10uW
> >> > area I believe.
> >> >
> >> > I've put the beacon on again *this morning until around 1pm* to
> >> > allow me to do some tests locally and, if you're able, I'd
> >> > appreciate you looking for it. Don't expect anything strong,
> >> > although at my usual test site it was a good signal on both a
> >> > loop and EFP antenna, and this is in your general direction.
> >> > Should you be able to detect it, you may be able to help estimate
> >> > the ERP better if you know the FS level.
> >> >
> >> > Frequency is derived by dividing down (by 26) from a 3.579545MHz
> >> > crystal, although I am unable to measure the precise final
> >> > frequency too accurately within 10Hz.
> >> >
> >> > If you are unable to do this test today, then perhaps another
> >> > time? I'm building the transverter which will have more power and
> >> > hope to erect the "in the air" loop within 7 days, after which
> >> > the ERP should be higher and WSPR tests can start.
> >> >
> >> > 73s
> >> > Roger G3XBM
> >> > --
> >> > http://g3xbm-qrp.blogspot.com/
> >> > http://www.g3xbm.co.uk
> >> > http://www.youtube.com/user/g3xbm
> >> > G3XBM   GQRP 1678    ISWL G11088
> >> >
> >>
> >>
> >>
> >
> >
> > --
> > http://g3xbm-qrp.blogspot.com/
> > http://www.g3xbm.co.uk
> > http://www.youtube.com/user/g3xbm
> > G3XBM   GQRP 1678    ISWL G11088
> >
>
>
>
> --
> http://g3xbm-qrp.blogspot.com/
> http://www.g3xbm.co.uk
> http://www.youtube.com/user/g3xbm
> G3XBM   GQRP 1678    ISWL G11088
>

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-- 
http://g3xbm-qrp.blogspot.com/
http://www.g3xbm.co.uk
http://www.youtube.com/user/g3xbm
G3XBM   GQRP 1678    ISWL G11088

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