----- Original Message -----
Sent: Tuesday, January 27, 2009 11:15
AM
Subject: LF: PROPAGATION WSPR
On LF I do not think wspr is the
correct mode to study propagation as suggested by some. Two
procedures are required with the mode. First it has to be detected then
analyised and decoded into a print format to be viewed. Morse sent in the QRS
mode at a suitable speed between 1 and 120 sec dot only requires one
procedure, to be detected and viewed and would give a good indication of
propagation whether used for QSO purposed or otherwise.
I have pointed out recently that I have observed
all of the traces from those transmitting WSPR and had the carrier been
directly keyed in QRS mode an ID or intellegence would have been conveyed,
whereas only part of the time was the signals decoded in wspr. For those
viewing the print format only and getting no copy would never know whether the
signall was being received or if it was faulty sampling and decoding.
Cut out the second procedure of decoding, avoid
ambiguity and use the slow keyed carried method using morse code or
murray code. A waterfall display and the EYE is a very sensitive detector,
For those experimenting with data modes have
fun but todate in the amateur radio LF/MF context nothing yet has
surpassed the use of slow morse keyed at a speed to suit one's needs ie
propagation studies or communication between two stations.
mal/g3kev
