Greetings everyone,
Despite the poor copy in PSK01, it shows what "would have been possible"
with a transmission using heavy FEC (forward error correction) and block
codes - sort of what moonbouncers use on 144 MHz, though JT65 is
definitely not a good choice for LF since we don't suffer from doppler
effect, faraday fading etc here.
Keep in mind that PSK31 (from which PSK01 is just a slower variant) was
intended as a keyboard-to-keyboard mode. There is are decent FEC
capabilities in G3PLX's PSK implementation, but it uses QPSK in that
mode to maintain the same throughput, and IMO QPSK in very slow modes
demands too much frequency stability (for RX, TX, and analog/digital
converter clock).
Well. just a few thoughs .. I may add FEC coding to (B)PSK01 but I think
WOLF- or JT65- like block codes are way more efficient, so it may be
more rewarding to add a simple ("Jason-like") user interface to
Stewart's programs. Any volunteers ? ;-)
73, Wolf DL4YHF .
Hartmut Wolff schrieb:
John,
WD2XES will be running in Spectrum Laboratory's PSK01 mode tonight on
137.442 kHz, starting by 2300 UTC. If conditions are really good, there is
some chance that Hartmut may have a little copy overnight.
Only very little copy. 2 full "WD2XES". Warren, WD2XGJ was very strong
the whole night Captures are on my website.
This is what I captured from the PSK 01 transmission during the night:
---
u e bf1ۂ yti t o{18}f %el rv {10} e yelnen MA.. W?XEb eo52y4S tonl`n
e Žo X WDo se o{24}HoldeIMn {27}Ø{10}toI t yPo Xoeewae ten,eg MA.g
|
