Hi Neil,
I agree with what Ron said. Also, note that even in FSK the phase is
continuous, so I wouldn't call the instant frequency jump a "sharp
transition" (but this is arguing about names, anyway).
It's true that the GFSK version includes amplitude ramp-up and ramp-down
at the start and end of
Thanks for the correction Neil, I was sure FT8 was RRC filtered FSK, now I know
better.
Like Daniel though, I'm not sure why GFSK would require more linearity than FSK
with abrupt phase transitions. I've never used GFSK, but I have used GMSK which
is quite similar and it didn't require very high
El 13/1/20 a las 19:47, Neil escribió:
> Alternative description of Automatic Level Control now we are in the
> world of SDR:
>
> "ALC: An ancient and terrible use of amplitude feedback control by
> boat-anchor radios which had insufficient control over their modulation
> sources and had excessive
Alternative description of Automatic Level Control now we are in the
world of SDR:
"ALC: An ancient and terrible use of amplitude feedback control by
boat-anchor radios which had insufficient control over their modulation
sources and had excessive gain. A cause of envelope distortion,
interm
Hi Nate, thanks very much for the link, I will study the module as it might be
just what I was looking for. FT8 is fortunately FSK over SSB, but for general
SSB work this would be essential.
Thanks,
Adrian
On January 13, 2020 6:06:17 PM UTC, Nate Temple wrote:
>Hi Adrian,
>
>You may be interes
Hi Adrian,
You may be interested in this OOT by drmpeg:
https://github.com/drmpeg/gr-cessb
Based on this paper:
http://www.arrl.org/files/file/QEX_Next_Issue/2014/Nov-Dec_2014/Hershberger_QEX_11_14.pdf
>From the paper: "Generate SSB without the big overshoot peaks that make ALC
necessary with co
Hi Marcus,
I'm not a hardware guy, but I think it's a circuit that monitors voltage from
the final amplification stage and adjusts gain of previous stages if the
maximum level is exceeded. Present in all classic SSB transceivers. Perhaps
somebody else can explain better.
Adrian
On January 13,
Hey Adrian, that's nice!
Generally: you said you couldn't implement an ALC: what's an ALC?
Best regards,
Marcus
Mon, 2020-01-13 at 16:40 +, Adrian Musceac wrote:
> Hi,
>
> I wrote a report about combining WSJTX and GNU radio with a PlutoSDR
> transceiver to achieve FT8 contacts on the 144
