Hi All
Last night Charlie G3WDG and I did some 24 GHz tests on QRA D to compare with
JT4f. I used r7375.
We completed QSOs on both modes which is the first time we have done this when
I have been operating from home (with a restricted window) and our first 24 GHz
QRA QSO. These QSOs are also the second longest 24 GHz contacts ever completed
and were much easier than the 62 km longer World Record 24 GHz contact.
Spreading was around 95 Hz. Lunar degradation was only 0.2 dB. The Moon became
visible through clouds after the first two periods of the JT4f test and was
clear of clouds for the QRA D tests and thus cloud loss would have been
improving. PW was not all that low, 16.4 mm at my end and 15.5 mm at
Nottingham near Charlie.
Below are the decodes at the time and show that while JT4f required DS all the
time, QRA generally got through with RC=0, (no prior knowledge) and in two
cases RC=3, which looks very promising for QRA.
11 dec decodes.PNG
The degradation tests are below and summarised as follows:
Degradation
JT4f
QRA D
0 dB
7/8
7/7
1 dB
4/8
7/7
2 dB
5/8
7/7
3 dB
4/8
6/7
4 dB
2/8
4/7
5 dB
2/8
1/7
6 dB
0/8
0/7
50% decoding is around 3 dB degradation on JT4f and around 4 dB on QRA D. JT4f
produced one false decode and QRA D none.
CONCLUSION
While I was very excited by the excellent QRA D results on 24 GHz it is
difficult to say that there is a definite advantage over JT4f as the cloud loss
was reducing at my end over the test. Nevertheless a very promising result for
QRA on 24 GHz.
73 Rex VK7MO
QRA D
0 dB Deg
1545 -20 2.2 1018 :* VK7MO G3WDG IO92 0
1547 -20 2.3 1038 :* VK7MO G3WDG R-18 0
1549 -20 2.4 1020 :* VK7MO G3WDG R-18 0
1551 -19 2.6 1019 :* VK7MO G3WDG R-18 0
1553 -20 2.4 1033 :* VK7MO G3WDG 73 3
1555 -20 2.2 1036 :* VK7MO G3WDG -18 0
1557 -21 2.3 1027 :* VK7MO G3WDG -18 3
1 dB Deg
1545 -21 2.3 1020 :* VK7MO G3WDG IO92 0
1547 -20 2.2 1037 :* VK7MO G3WDG R-18 0
1549 -20 2.4 1020 :* VK7MO G3WDG R-18 0
1551 -20 2.7 1017 :* VK7MO G3WDG R-18 0
1553 -21 2.4 1034 :* VK7MO G3WDG 73 5
1555 -20 2.3 1036 :* VK7MO G3WDG -18 0
1557 -21 2.4 1025 :* VK7MO G3WDG -18 5
2 dB Deg
1545 -22 2.2 1020 :* VK7MO G3WDG IO92 5
1547 -21 2.3 1043 :* VK7MO G3WDG R-18 0
1549 -20 2.6 1021 :* VK7MO G3WDG R-18 0
1551 -21 2.5 1019 :* VK7MO G3WDG R-18 3
1553 -22 2.4 1034 :* VK7MO G3WDG 73 5
1555 -22 2.4 1028 :* VK7MO G3WDG -18 3
1557 -22 2.3 1025 :* VK7MO G3WDG -18 5
3 dB Deg
1545 -22 2.3 1015 :* VK7MO G3WDG IO92 5
1547 -22 2.3 1034 :* VK7MO G3WDG R-18 3
1549 -22 2.6 1020 :* VK7MO G3WDG R-18 3
1551 -21 2.5 1018 :* VK7MO G3WDG R-18 3
1553 -22 2.4 1033 :* VK7MO G3WDG 73 5
1555 -22 2.4 1033 :* VK7MO G3WDG -18 3
1557 -23 2.5 1024 :*
4 dB Deg
1545 -24 2.3 1014 :* VK7MO G3WDG IO92 8
1547 -22 3.1 965 :*
1549 -23 2.6 1026 :* VK7MO G3WDG R-18 5
1551 -22 2.5 1015 :* VK7MO G3WDG R-18 3
1553 -22 2.4 1034 :* VK7MO G3WDG 73 5
1555 -22 2.4 1028 :*
1557 -23 2.2 1027 :*
5 dB Deg
1545 -23 2.2 1027 :*
1547 -24 2.4 1038 :* VK7MO G3WDG R-18 5
1549 -22 2.4 1016 :*
1551 -20 2.7 1026 :*
1553 -23 2.5 1029 :*
1555 -22 4.3 1044 :*
1557 -21 0.2 1043 :*
6 dB Deg
1545 -23 5.1 1047 :*
1547 -24 0.5 1049 :*
1549 -22 -0.9 1000 :*
1551 -23 2.7 998 :*
1553 -23 2.4 1031 :*
1555 -23 2.1 1032 :*
1557 -23 0.0 994 :*
JT4f
0 dB Deg
1527 -21 2.6 1032 $# VK7MO G3WDG -20 d16
1529 -23 2.5 1014 $* VK7MO G3WDG RRR d18
1531 -24 2.6 1038 $* VK7MO G3WDG 73 d19
1533 -20 2.5 1034 $# VK7MO G3WDG -18 d1*
1535 -19 2.6 1023 $# VK7MO G3WDG -18 d1*
1537 -19 2.5 1036 $# VK7MO G3WDG -18 d1*
1539 -28 3.2 1053 $#
1541 -18 2.5 1023 $# VK7MO G3WDG -18 d1*
1 dB Deg
1527 -21 2.5 1029 $#
1529 -26 -1.3 994 $*
1531 -23 -0.7 1003 $*
1533 -20 2.5 1032 $# VK7MO G3WDG -18 d1*
1535 -19 2.5 1023 $# VK7MO G3WDG -18 d1*
1537 -20 2.5 1023 $# VK7MO G3WDG -18 d1*
1539 -26 2.8 1018 $*
1541 -19 2.6 1023 $# VK7MO G3WDG -18 d1*
2 dB Deg
1527 -24 2.5 1032 $# VK7MO G3WDG -20 d18
1529 -23 -0.3 977 $*
1531 -25 2.5 1036 $*
1533 -21 2.5 1036 $# VK7MO G3WDG -18 d1*
1535 -19 2.5 1021 $# VK7MO G3WDG -18 d1*
1537 -20 2.5 1023 $# VK7MO G3WDG -18 ? d12
1539 -27 2.3 1021 $#
1541 -19 2.6 1029 $# VK7MO G3WDG -18 d1*
3 dB Deg
1527 -24 -1.0 1007 $#
1529 -24 -1.1 972 $*
1531 -26 4.6 1018 $*
1533 -21 2.4 1036 $# VK7MO G3WDG -18 d18
1535 -22 2.5 1021 $# VK7MO G3WDG -18 d1*
1537 -24 2.5 1023 $# VK7MO G3WDG -18 ? d11
1539 -28 3.4 975 $#
1541 -21 2.5 1023 $# VK7MO G3WDG -18 d1*
4 DB Deg
1527 -23 4.8 999 $*
1529 -24 -0.7 997 $#
1531 -27 3.3 1053 $*
1533 -24 2.5 1038 $# VK7MO G3WDG -18 d13
1535 -25 2.5 1025 $# VK7MO G3WDG -18 ? d11
1537 -27 0.4 999 $#
1539 -26 -0.9 1042 $*
1541 -24 2.6 1036 $#
5 dB Deg
1527 -25 0.5 1001 $#
1529 -25 -0.2 1029 $#
1531 -32 4.6 1018 $*
1533 -28 1.5 994 $*
1535 -26 2.5 1023 $# VK7MO G3WDG -18 ? d12
1537 -24 2.5 1042 $#
1539 -25 -1.0 972 $*
1541 -24 2.6 1023 $# VK7MO G3WDG -18 d1*
6 dB Deg
1527 -27 -0.7 1025 $*
1529 -31 3.7 968 $*
1531 -25 1.5 1040 $*
1533 -24 2.5 1040 $#
1535 -21 2.5 1014 $# VK7MO G3WDG -11 ? d12 False Decode
1537 -26 1.6 1012 $#
1539 -25 2.5 1045 $#
1541 -26 -0.2 1021 $*
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