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Don't destroy your noise figure though. But at HF you can probably get away with 20 dB at least.
2009/3/16 Gary - G4WGT <[email protected]>
Andy,
OK, I will insert an attenuator at the antenna socket (that’s an easy move) & watch how it performs. It is switched at 10dB steps so I will start at 10db of course.
Cheers,
Gary.
Doesn't matter which - just total system gain. That S/W works best if the noise threshold rides at about 10dB above the baseline, then it allows for up to 70 - 80dB of signal peaks.
2009/3/16 Gary - G4WGT <[email protected]>
Alan,
When you wrote :-
my only comment is that you may have too much gain in the system.
Are you meaning sound card or receiver gain?
Gary.
To: [email protected]
Subject: Re: LF: RE: Syncback software
Hi Gary my only comment is that you may have too much gain in the system. It
is sometimes better to have the noise further down nearer the axis..
I am afraid there is a major problem with this kind of beacon, when the
fading period is shorter than the sampling interval, so you dont really know
what the path is doing. The only reliable points are the peaks, the troughs
dont really mean anything without some very sophisticated analysis and
probably two spaced receivers. However it does give a snapshot of the band
without taking up too much bandwidth (this was what was required for 5MHz
too). Despite all the data collected very little analysis has actually be
done on the 5MHz data collected by this program. The one succesfull bit of
work was that published in Radcom by Marcis Walden G0IJZ. I used it for some
time whilst Andy was testing the Poldhu beacon on 160m and also during the
1st two months that ran. I was certainly surprised by the daytime path on
160m from here. I have seen the data collected in Canada via Joe Craig VO1NA
and it is difficult to see how to use it.
Still if you dont collect the data you will never know!!
Alan G3NYK
----- Original Message -----
From: "Gary - G4WGT" <[email protected]>
To: <[email protected]>
Sent: Monday, March 16, 2009 6:35 PM
Subject: RE: LF: RE: Syncback software
> Hi Graham, LF,
>
>
>
> The original HTML Code for the 2 minute refresh is still inserted into the
> page format, so upload is 30 minute intervals with Syncback & 2 minute
> refresh. I have left the refresh in case I revert back to the original
> grabber page. I will look at changing it if I continue to use the beacon
> chart upload.
>
>
>
> I would like to have feedback from the LF group regarding the page, if you
> check it out periodically, is it useful to you, what are you looking for.
>
>
>
> You can view the chart on my web site at :-
>
>
>
> http://myweb.tiscali.co.uk/wgtaylor/grabber3.html
>
>
>
> 73
>
>
>
> Gary - G4WGT.
>
>
>
>
>
> _____
>
> From: [email protected]
> [mailto:[email protected]] On Behalf Of Graham
> Sent: 16 March 2009 17:20
> To: [email protected]
> Subject: Re: LF: RE: Syncback software
>
>
>
> Hi Gary,
>
>
>
> The page seemed to refresh quite often ... are there two settings ?
>
>
>
> G ..
>
>
>
> From: Gary - G4WGT <mailto:[email protected]>
>
> Sent: Monday, March 16, 2009 10:40 AM
>
> To: [email protected]
>
> Subject: RE: LF: RE: Syncback software
>
>
>
> Hi Graham, LF,
>
>
>
> You wrote :-
>
> >>>Upload is set at 5 minute intervals and auto refresh at 2 minute
> intervals. <<< that could be backed off to 15 mins as the beacon only
> sends every 15 ??
>
>
>
> I mentioned in my previous mail to ignore the text on the page as it was
> originally for grabber 1 for when I upgrade the web site (to a new design
&
> better navigation etc), also mentioned is that upload is every 30 minutes.
>
>
>
> If the uploaded chart proves useful or interesting to operators & viewers
> then I will change the text & make it a permanent feature for the
> foreseeable future.
>
>
>
> BTW :-
>
>
>
> For those of you who are not familiar with the chart -
>
>
>
> The RED trace is Andy's (G4JNT) beacon signal & the BLACK trace is the
noise
> level at my QTH.
>
>
>
> The Blue & GREEN are not in use & should be ignored on this chart as they
> are for the other beacons used when monitoring on the 5MHz allocation.
>
>
>
> Cheers,
>
>
>
> Gary - G4WGT
>
>
>
>
>
> _____
>
> From: [email protected]
> [mailto:[email protected]] On Behalf Of Graham
> Sent: 15 March 2009 22:17
> To: [email protected]
> Subject: Re: LF: RE: Syncback software
>
>
>
> Gary..
>
>
>
> That looks good ... 0500 looks best time for a qso .. see you then Smile
> emoticon
>
>
>
> >>>Upload is set at 5 minute intervals and auto refresh at 2 minute
> intervals. <<< that could be backed off to 15 mins as the beacon only
> sends every 15 ??
>
>
>
> the 15 db over the noise in day time is the same at this qth .. looks
like
> the big dips round 1900 where just when we where testing .. typical hihi
>
>
>
> tnx- G ..
>
>
>
> From: Gary - G4WGT <mailto:[email protected]>
>
> Sent: Sunday, March 15, 2009 7:55 PM
>
> To: [email protected]
>
> Subject: LF: RE: Syncback software
>
>
>
> LF,
>
>
>
> I have now got the software, Syncback running correctly (I think).
>
>
>
> The purpose of this is to upload the chart from Andy's beacon as received
> here to my web site periodically, ie. every 30 minutes.
>
>
>
> I now have a receiver running 24/7 monitoring Andy,s beacon on 503.7KHz.
>
>
>
> You can view the chart on my web site at :-
>
>
>
> http://myweb.tiscali.co.uk/wgtaylor/grabber3.html
>
>
>
> For the moment ignore the text on the page as it is originally designed to
> use with the 500KHz grabber when I renew my web site design. If it is a
> useful upload I will make it a permanent feature but may have to extend
the
> frequency coverage of grabber 1 so not to overload the PC with operations
> which will cause the PC to struggle.
>
>
>
> Let me have your comments please.
>
>
>
> 73
>
>
>
> Gary - G4WGT.
>
>
>
> _____
>
> From: [email protected]
> [mailto:[email protected]] On Behalf Of Gary - G4WGT
> Sent: 15 March 2009 16:10
> To: LF -RSGB LF Group
> Subject: LF: Syncback software
>
>
>
> Hi LF,
>
>
>
> If anyone is using Syncback software & can help, please.
>
>
>
> I am tying to upload a file to my website who's filename does not change,
> only the file size changes. I tried to do it with Argo-upload but failed
so
> I downloaded Syncback & still failing.
>
>
>
> Syncback gives me the following message :-
>
>
>
> **********************************
>
> Can connect, but unable to change to destination directory:
>
> /chart01.bmp:not a directory
>
> **********************************
>
> The Syncback help does not give me the answer.
>
>
>
> Any help will be appreciated
>
>
>
> Or
>
>
>
> Will Argo-Upload do it?
>
>
>
> Or
>
>
>
> Is there something else to do it?
>
>
>
> Thanks in anticipation,
>
>
>
> 73,
>
>
>
> Gary - G4WGT - IO83QP.
>
>
>
> _____
>
>
> No virus found in this incoming message.
> Checked by AVG - www.avg.com
> Version: 8.0.237 / Virus Database: 270.11.13/2001 - Release Date: 03/14/09
> 06:54:00
>
> _____
>
>
> No virus found in this incoming message.
> Checked by AVG - www.avg.com
> Version: 8.0.237 / Virus Database: 270.11.15/2003 - Release Date: 03/15/09
> 14:07:00
>
>
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