If it's 100W PEP then 40WRMS is about right with the
tools-options-clipping on (4dB PAPR).
On 20/12/20 3:19 pm, Mooneer Salem wrote:
On my Hermes Lite 2 + Hardrock-50, the latter was claiming 40 watts on
700E without touching any settings in the app. Will need to play more
to see how far it can be taken.
-Mooneer K6AQ
On Sat, Dec 19, 2020 at 7:22 PM David Rowe <[email protected]
<mailto:[email protected]>> wrote:
Thanks Walter and Mooneer. I'd be interested to know the RMS
power you can develop with 700D/E with the clipper option.
- David
On 20/12/20 10:30 am, Mooneer Salem wrote:
Looks like it's working reasonably well, though the 20 meter band
fell out shortly after we all got it installed. More testing
tomorrow for sure. :)
-Mooneer K6AQ
On Sat, Dec 19, 2020 at 2:26 PM <[email protected]
<mailto:[email protected]>> wrote:
Have it loaded and running now.
Working on a couple others as I type to get some end to end
testing.
Many thanks David, and best of the holidays.
Walter/K5WH
-----Original Message-----
From: David Rowe <[email protected] <mailto:[email protected]>>
Sent: Saturday, December 19, 2020 3:34 PM
To: [email protected]
<mailto:[email protected]>
Subject: [Freetel-codec2] FreeDV 1.5 - 700E and OFDM compression
I've been working on a new FreeDV 700E mode, and some
compression for FreeDV 700D and 700E to increase the average
power. A Christmas present for you to play with
700E is designed to handle fast fading like 700C, but like
700D has powerful FEC. My bench tests indicate 700C & E are
equivalent on moderate fading channels (2Hz dopdler/2ms
spread), but on very fast fading (4Hz/4ms) 700E does better -
700C & D fall over. 700D works better at lower SNRs on slow
fading channels.
I've also been testing against compressed SSB, which as
Helmut suggests is pretty hard to beat, as it's so robust to
fading. However 700E is hanging on quite well with fast
fading, and becomes noise free as the SNR increases.
-/-
The second innovation is compression of the 700C/D/E
waveforms, to increase average power significantly.
Please be careful adjusting the Tx drive and especially
enabling the Tool - Options - Clipping. It can drive your PA
quite hard. I have managed 40W RMS out of my 75W PEP
transmitter. Make sure your transmitter can handle long
periods of high average power. My IC7200 and
FT-817 seem OK.
At the same equivalent peak power - 700D is doing well when
compressed SSB is -5dB SNR and rather hard on the ears.
-/-
Peter VK3RV, Jose LU5DKI, and Barry VK3BRT tried 1.5.0 last
night and report it works on real HF channels.
The latest manual describes the new features:
https://github.com/drowe67/freedv-gui/blob/118cb66ee4679518185db871ec0ae68071c406a4/USER_MANUAL.md
You can download Windows 32 and 64 bit versions of FreeDV 1.5
here:
http://rowetel.com/downloads/freedv
-/-
I'd be interested in any feedback. If you have an
interesting test case (e.g. a bug or comparing SSB to
FreeDV), pls send me off air recordings of signals (FreeDV
Tools-Record File from Radio). That helps me make objective
comparisons. Recordings are much more useful to me than
anecdotes or subjective reports.
Thanks,
David
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