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Ok Peter ,
Well there is not much of a way round the
situation ...if you do a site survey with a portable rx and look for
the quietest spot for the antenna , that may help , you don't
need too much of a ae for rx purposes ....from what you say ,
your are in the open anyway ?sounds like a case of water water
everywhere and not a drop to drink !
can you set up a remote location and
run the cables under the ground ?
As the noise is a sort of uniform distributed
'noise' then I'm sure it would be possible to programme a noise reducing
software that simply summed multiple passes of the signal and used a
sort of addition to recover the data ok it would
have a delay , but so what ..only problem is finding someone who can code
it ...I ran a recoding of a low cw signal through the noise
filter of 'soundforge-9' and was just left with a cw signal .. so it can
be done ...
Height may help as well , if you can get the
active part of the antenna as high as possible and away from the
buildings that may reduce the level
Ok on the rtty , well 100 % copy
on rtty with Chris is a relatively new thing, before is was
quite a slog to get the message over !
good luck
G .
nb - have you tried using wide
band filters .. back all the gains off , will not suffer from
ringing as much .. I use my ws18 head phones for cw hihi
Sent: Monday, October 12, 2009 4:37 PM
Subject: Re: LF: MOFMT
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Ok Graham thanks for the info.
If it was on the same frquency that was probably Dennis and me. We've
been on for abt an hour ...hee. Well I can only conclude it is ADSL
because it is just raising the noise floor it is very subtle not
really identifiable like say TV LTB, it's a mush. Frame ants help a bit
but not as sensitive at the LW by a mile. I use everything SDR software to
niose blank and is filtering down to 200hz and Xtal filters on my
Kenwood TS690s which has all the filters. Its very depressing.
I took my DC rx around to Chris XIZ abt 6miles away and I could hear
you on RTTY the other day a smashing signal. I have a similar ant set up I
have a higher ASL and I am in open fields about 1/2 to a mile from
the rest of humanity but still have noise....dohh!!!
Any way gl Graham and thanks for the reports. Things will be picking
up now with the season change so hope to hear you for a twoway on
500kc/s soon.
73 petefmt
From:
Graham <[email protected]>
Subject: Re: LF: MOFMT
To:
[email protected]
Date: Monday, 12 October, 2009, 3:36
PM
Ok Peter
Should of given you a cal then but was
using the ft897 at the time , with no tx on 500
, good signal at the time , odd for mid day ? some cw
on at the moment 1530 bst , but quite low .. may be the same
tx ... noise level on the rx is showing s8 to s9 all day
.... across the full band, interestingly the dsp noise
reduction in the ft897
actually helps .. must be
the right kind of noise ...
As for the rx .. well in a direct
test , swopping from the ft897 and the ra1778m , the
ft897 was giving a better recovery of the signal
.. which is a bit disconcerting .. may be the wrong type of noise
for the 1778 xtal filters (1.4 mhz and do tend to ring a bit if
pinged) , but iv'e had a few replies lately where I could
not resolve the other station, I think mainly due
to the high level of noise a the qth
73 Graham
Sent: Monday, October 12, 2009 3:08 PM
Subject: Re: LF: MOFMT
|
Thanks Graham
Not a beacon but a call, computer generated. Locally we try
to have a qso weekdays at around 11:45 or at some time over the
lunch hour and again later around 4:00 it is a very loose
sched with M0JXM Dennis and rarely M0KHW.Ken. Rog GW3UEP
listens some times whch is remarkable and reports by
e-mail because I can't hear him its my RX or location (adsl
noise?) that is poor but we should be reciprical.
FYI the current rig is an xtal controlled GW3UEP (ala
UK500kHZ group) this week run off a laptop PSU very approx 35
watts output to a lw up 12m - 40m lng. Tnx fer rprt, meanwhile
back to the RX with a big hammer.
73 petefmt
From:
Graham <[email protected]>
Subject: LF:
MOFMT
To: [email protected]
Date: Monday, 12
October, 2009, 12:34 PM
M0FMT ,Good 569 from
the 35 ft vertical (with atu ) ft897-d
speaker at 1200 bst to day , normal speed cw ,
beacon or live cq call ?
Graham
G0NBD /.
io83lk
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