Hi Alan,
What do you estimate, what is the average global background noise level
increase in dB due to the rising QRM generators (SMPS, plasma TV, energy
saving lamps.....) since these early days?
73, Stefan/DK7FC
Am 20.04.2012 19:20, schrieb Alan Melia:
Hi Graham you may not be aware that the only modes that were available in
the early days when the 1st TAs were achieved was QRSS3. Robert Horne,
author of Spectrogram saw now use or reason for a slower
waterfall.....remember he is a biologist and this suite was written for
recording and analysing animal and marine mammal sounds. The results were
obtained in a period or high geomagnetic activity just after the peak of the
last Solar max (Geomag activity trails sun-spots by about a year) We have
just had the quietest minimum for years and the level of activity is
relative to the last max still quite low.
The modern digital modes are around 20dB more sensitive than QRSS3 this
accounts for the difference between 100s watts and less that 10 watts, even
allowing for quieter conditions. I think this is what you usually call
"progress" :-))
Alan
G3NYK
----- Original Message -----
From: "Graham"<[email protected]>
To:<[email protected]>
Sent: Friday, April 20, 2012 11:32 AM
Subject: LF: 136 propagation a QRO secret ?
Have the high power operators on 136 been keeping the real potential
of 136 propagation a secret ? writing you name in neon light is one
thing , but behind the glow of the sign , previously un seen, the data
recording Op beacon system is starting to reveal some interesting
features of this band.
Results from the first 'plug and play' 'peoples' beacon, seem to
show , DX operation on 136 is not quite as difficult as was perhaps
made out , from the first TA decode of OP8 , using a
Parasol-on-a-Stick , with a few hundred watts , to RA3AGC long wire to
the trees , with similar power and PA0A 'small array' .. 2000 Kmtr +
decodes are showing up on a quite regular basis , may be more than that
offered by 500 KHz ?
VK 136 operators have expressed interest in setting up sked's to
make, what could be the first full call sign decode , to down under,
but to date, it seems there are no transmit takers this side ,
Technically, the processing gain of OP32 , is very close to the
estimated -40 dB path loss , EU-VK and should require 16 mins of
carrier above the s/n threshold in 32 mins to decode ...
Anyone tempted to make a sked ?
G,,
24 hour usage from http://pskreporter.info/pskmapn.html
Txmtr Rcvr Band Mode Distance Time (UTC)
7L1RLL 7L1RLL 2200m OPERA 0 kms 09:54:58
PA3BHT PA3BHT 2200m OPERA 0 kms 09:53:41
PA0WMR PA0WMR 2200m OPERA 0 kms 09:45:35
JH1ARY JH1ARY 2200m OPERA 0 kms 09:43:42
UA0SNV-1 UA0SNV-1 2200m OPERA 0 kms 09:36:19
JP1ODJ JP1ODJ 2200m OPERA 0 kms 09:34:55
JF1PSS JF1PSS 2200m OPERA 0 kms 07:38:29
UA0SNV UA0SNV 2200m OPERA 0 kms 07:33:19
JH1INM JH1INM 2200m OPERA 0 kms 06:39:52
JA8SCD JA8SCD 2200m OPERA 0 kms 06:29:50
7L1RLL JH1INM 2200m OPERA 76 kms 03:34:10
7L1RLL JA8SCD 2200m OPERA 26 kms 03:34:10
7L1RLL JP1ODJ 2200m OPERA 50 kms 03:34:09
JH1GVY JH1GVY 2200m OPERA 0 kms 03:03:32
JH1GVY JH1INM 2200m OPERA 99 kms 02:53:27
JH1GVY JA8SCD 2200m OPERA 18 kms 02:53:27
JH1GVY JP1ODJ 2200m OPERA 29 kms 02:53:26
JH1GVY JH1ARY 2200m OPERA 8 kms 02:53:26
JH1GVY 7L1RLL/1 2200m OPERA 35 kms 02:53:25
JF1PSS JF1PSS 2200m OPERA 0 kms 00:05:54
JH1GVV JH1GVV 2200m OPERA 0 kms 23:52:38
RN3AGC RN3AGC 2200m OPERA 0 kms 22:14:04
PA0A PA0A 2200m OPERA 0 kms 21:41:06
PA0A RW3ADB 2200m OPERA 2017 kms 21:39:21
PA0A RN3AGC 2200m OPERA 2020 kms 21:39:04
RW3ADB RW3ADB 2200m OPERA 0 kms 21:29:27
G0KYE G0KYE 2200m OPERA 0 kms 21:24:03
PA3ABK PA3ABK 2200m OPERA 0 kms 20:36:47
PA0OCD PA0OCD 2200m OPERA 0 kms 19:45:48
G8HUH G8HUH 2200m OPERA 0 kms 19:01:25
PA0OCD PA0A 2200m OPERA 128 kms 18:50:46
G4MDH G4MDH 2200m OPERA 0 kms 18:32:30
YO2LDK YO2LDK 2200m OPERA 0 kms 18:31:21
PA0OCD PA3ABK 2200m OPERA 62 kms 17:44:05
LZ1LZ LZ1LZ 2200m OPERA 0 kms 15:12:01
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