Hi all,
It's time for a brief update on status of the new mode QRA64 in MAP65.
MAP65 has been around since 2007. Together with suitable hardware, this
program provides for the reception and decoding of all JT65 signals
found in a bandwidth up to 90 kHz. With a dual-polarization antenna and
two-channel receiver, it adds adaptive polarization capability,
optimizing the polarization angle used to receive each individual JT65
signal. MAP65 also calculates and displays the polarization angle you
should use in order to transmit a signal that will arrive at a decoded
DX locator with the same polarization as used to transmit the signal you
received.
A version of MAP65 is now running at my station with limited
"bi-lingual" capability in JT65 and QRA64 modes. It receives
simultaneously in both modes; you select which mode to transmit.
Here's an example of dual-mode reception of EME signals on 2 meters over
20 minutes on the evening of January 8, copied from my MAP65 output file
map65_rx.log:
Freq DF DT Pol S/N UTC Message TxPol Mode
-----------------------------------------------------------------
144.108 -208 2.4 90 -26 0220 K1JT NJ2R EN82 H $ A
144.124 -412 2.5 138 -24 0220 W2DBL OZ4VV JO46 OOO V # B
144.108 -210 2.5 45 -27 0222 K1JT NJ2R R-26 $ A
144.108 -213 2.4 90 -25 0224 K1JT NJ2R R-26 $ A
144.114 -265 2.5 95 -25 0224 W7MEM G4TRA IO81 OOO H # B
144.108 -216 2.4 135 -28 0226 K1JT NJ2R R-26 $ A
144.114 -268 2.5 92 -22 0226 W7MEM G4TRA IO81 OOO H # B
144.108 -218 2.5 90 -25 0228 K1JT NJ2R 73 $ A
144.108 187 2.7 0 -26 0232 K1JT K0TPP EM48 V $ A
144.108 -223 2.6 45 -27 0232 K1JT OZ4VV JO46 V $ A
144.108 186 2.6 0 -25 0234 K1JT K0TPP EM48 V $ A
144.108 185 2.6 45 -25 0238 K1JT K0TPP R-23 $ A
144.108 184 2.6 45 -25 0240 K1JT K0TPP 73 $ A
The decodes frequency 144.108 are signals in mode QRA64A, as indicated
by the end-of-line symbols "$ A". Decodes at 144.114 and 144.124 are
JT65B, indicated by "# B".
Some capabilities are not yet implemented (or only partially
implemented) for QRA64 mode. Polarization-matching on receive is only
to the nearest 45 degrees. As usual in MAP65, JT65 signals are found
anywhere in the frequency range displayed in the upper waterfall.
However, QRA64 signals are detected only in the range displayed in the
lower ("zoomed") waterfall, typically about 5 kHz wide. If several
QRA64 signals are present in this range, you can decode each one by
double-clicking on it.
I expect that future development will lead to QRA64 capabilities
identical to those of JT65 in MAP65.
At this point it would be useful to have some feedback from potential
users of MAP65, Version 2.7. If you would like to be an early tester of
this unreleased program version, please send me an email off-list.
-- 73, Joe, K1JT
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