Hello all test-users of WSJT-X,
Today I used the afternoon to solve some issues encountered by using
WSTJ-X v0.2 r2706. Test setup Flex1500 TXing 1mW, with a lot of
attenuation into a power combiner, output to a Flex 5000 RXing and the
other input of de combiner to an active antenna providing real outdoor
noise and some QRN. PC's Windows 7 64bit.
JT9-2: minimum SNR (on WSJT screen) for solid decodes is - 22dB. All OK
while increasing the input level of the wanted signal untill the SNR
reaches 0 dB (-1 dB is still OK) Here we get the famous
*********15P6715P67WCV. The dynamic range of JT9-2 is in this case only
30 dB. (Remote stations receiving relative weak signals had the best
results)
Conclusion: for the time being you have to keep the RX signals at a
level below a SNR of 0dB and above 22 dB for 100% decodes.
Very important also is the timing, keep your PC clock within 1 sec
accuracy and keep your tx and rx frequency as stable as possible.
73, Albert
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