Hi David (et al),
I have been doing some testing with the new V4 SM1000 firmware over the
last week and it has indeed solved the "burble problem" I was
experiencing with V3 firmware with background SSB noise.
700D decodes well down into the noise floor (using FreeDV together with
HPSDR/PowerSDR as the signal source). It's amazing how well it does
with a low SNR. I can barely distinguish the 700D signal within the
background noise (QRN & QRM) but the SM1000 still happily decodes with
the occasional audio glitch.
Well done!
Michael.
VK5LN/VK5ZEA
On 21/05/2020 6:17 pm, David Rowe wrote:
Hi Michael,
I've been working on this one. One thing lead to another and I ended up
refactoring all of freedv_api.c which was getting out of hand with all
the modes that had been added over the years:
https://github.com/drowe67/codec2/pull/111
So as well as testing the SM1000 we'll need to test a new version of
FreeDV GUI shortly :-)
Anyhoo, some new v4 firmware for you (and anyone else) to try:
https://github.com/drowe67/codec2/blob/master/stm32/doc/sm1000_manual.md
It's been running all day here right next to me (I'm WFH) without a
single noise. In fact it's a bit _too_ quiet, although I can see the
sync led flashing every few seconds as it gets a "maybe 700D" sync on noise.
Cheers,
David
On 3/4/20 1:09 pm, David Rowe wrote:
Hi Michael,
I've managed to reproduce the issue by setting up my FT-817 with a
SM1000, and some powered speakers so I could leave it running for a
while and hear it from the next room. It's "breaking squelch" for me a
few times a minute. Might be signal dependent too, ie what sort of
background signals there are on the band.
Would be nice to fix this, so the SM1000 can be left running like a
squelched FM radio.
I'll think about how to deal with this, will take a few weeks to fix.
Steve - thanks for your suggestions too.
Cheers,
David
On 2/4/20 5:00 pm, Michael Carey wrote:
Hi David,
I've tried Rev 2 again and it doesn't seem to be much better.
I can minimise the issue by reducing the audio level out of the IC-7100
Accessory connector (menu setting changed from 50% to 25%).
The SM1000 still seems decode the transmissions from the
FreeDV/HPSDR/PowerSDR setup fine with the audio output level reduced to
25%.
What is the recommended (optimal) audio level expected at the input of
the SM1000 with the RIG SPKR trimpot set midway? Is the flashing
Clip/Error LED an indication of too much audio in? When does it's
function change from Clip to Error?
Michael.
VK5ZEA
On 2/04/2020 8:07 am, Michael Carey wrote:
Hi David,
I don't recall having this issue with the Rev 2 firmware, but I am
going to "downgrade" today to compare.
Still unsure of what triggers it... but when I disconnect my IC-7100
from the antenna the issue is very much less pronounced. The smallest
amount of QRM (even inaudible to my ear) seems to make it worse.
Michael.
VK5ZEA
On 2/04/2020 6:20 am, David Rowe wrote:
Hi Michael,
OK thanks I will check this out over the weekend and get back to you.
There's a TTY output that we can use to see what's going on (e.g. if
it's getting false sync or breaking squelch).
List: Is anyone else using the SM1000 with 700D experiencing this
problem?
Michael - was the problem present on the Rev 2 firmware?
Cheers,
David
On 1/4/20 5:26 pm, Michael Carey wrote:
Hi David (et al),
I loaded my SM1000 (Ref D) with v3 firmware today and it seems to be
working very well on air.
My SM1000 is connected to an Icom IC-7100 using the accessory
connector,
SM1000 modified to give more audio drive into the ACC connector.
I'm using FreeDV together with a HPSDR/PowerSDR to monitor and transmit
back to the SM1000.
The only thing I have noticed is that when in 700D mode, I get a
continual burbles and squeaks from the SM1000 when tuned to a free
frequency. The Sync and Clip/Error LEDs flash almost continually. The
audio level from the radio into the SM1000 doesn't seem to make a
difference, very low audio levels from the IC-7100 into the SM1000
seems
to make this happen.
I get the occasional flash of the Sync and Clip/Error LED in 1600 mode,
but until it actually starts decoding a 1600 transmission, it remains
silent.
73
Michael
VK5ZEA
On 9/03/2020 7:07 am, David Rowe wrote:
Hello List,
A few months ago Mal, VK8MT, spotted a few bugs in the SM1000 user
interface. I have had a go at fixing them, integrating the latest 700D
modem tweaks, and adding the automatic microphone equaliser:
https://github.com/drowe67/codec2/pull/58
I've also tweaked the doco, adding links to the V3 binaries, and
fixing
a glitch in the example wiring diagram:
https://github.com/drowe67/codec2/blob/dr-sm1000-tweaks/stm32/doc/sm1000_manual.md
If you are interested, please try it out over the air and let me know
how it goes.
http://www.rowetel.com/downloads/codec2/smartmic/sm1000v3.bin
http://www.rowetel.com/downloads/codec2/smartmic/sm1000v3.dfu
On power on you should hear 'V3' in morse, followed by the current
mode
(ANA for analog if it's a fresh reflash).
Thanks,
David
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