Thanks for that. I will
scope around and look for noise, but I cannot hook up a stereo
headphone since the line2 USB does not have outputs.? I can't
use anything for output as this is in a sealed metal box that I
run remotely five floors away and there is not room for anything
else in the box!? I presently have brought it down to the apt to
see about adjusting
The images going back happen as soon as I get out of the config
screen. I have not found any 'save' button in the screens and
other settings seem to be safe on leaving.
One thing I do notice is that when receiving an AM signal,
multiple spurious sidebands appear when I turn the AM modulation
up past about 30% on the service monitor.
I looked into the subsample delay earlier on and found something
to compensate from the documentation (I can;t remember what it was
- that was a few months ago) and it didn't change anything. I
would imaging that if this was the case though, I wouldn't be able
to get clean audio demodulated on BC stations as well as CHU and
WWV, and some CW on 40m.
One thing I did was to disconnect the Adafruit 12V-5V switch-mode
regulator and power it directly from my lab supply, and that
didn't make any difference to the mountain.
I'm still leaning towards a driver issues since the chip is not
the TI one and I wonder if there is a way to change it, but so far
have found nothing!
Thanks for your help
Nigel ve3id
Nigel Johnson, MSc., MIEEE, MCSE VE3ID/G4AJQ/VA3MCU
Amateur Radio, the origin of the open-source concept!
Skype: TILBURY2591
On 2022-12-05 13:26, Chuck Ritola
wrote:
toggle quoted message
Show quoted text
To determine if the spectral hump in the center is noise,
switch Quisk's mode to DGT-IQ, tune to the center where the
spectral hump is and give it a listen on stereo headphones.
What you hear is more-or-less a direct feed from your audio
interface as it is heard by Quisk. The center hump does NOT
look amplitude/phase/delay related, or, at least, whatever
amp/phase issues are being buried by a much bigger issue.
I warn that some of those Behringer interfaces have
subsample delay which will cause phase/mirroring issues. If
your hardware indeed has that bug, phase corrections will be
futile as the subsample delay changes every time the interface
is powered up, making the saved corrections unusable. I did a
write-up on this a few months ago:
On Nov. 24th you stated? "The image seems to reduce but then goes back to
the previous level." but did not state /when/ it goes back
to the previous level, so I can't comment as to whether or
not subsample delays, which change with every powerup, is
contributing to your issue.
It's doubtful that the interface is placing bass emphasis
on the audio /input/ as low frequencies are not generally a
bottleneck in transformerless recording.?
My understanding is that you are using a Behringer Line2
for input. I don't know if it has the subsample delay bug.
It's not clear if you are still using the UFO202 for output.
From what I can find, the UFO202 uses a TI 2902 chip, which I
had confirmed has the subsample delay bug.
Looking at the softrock ensemble 40 RX's schematic, I don't
see any isolation transformers on the softrock's analog audio
output but I do see isolator caps. Ground hum, usb data noise,
ethernet noise or supply noise may be happening. The DGT-IQ
listen should help determine that.
On Mon, Dec 5, 2022 at 12:48
PM Nigel Johnson MIEEE via <nw.johnson=
[email protected]>
wrote:
I got that, but the
Behringer does not have USB output!
Nigel Johnson, MSc., MIEEE, MCSE VE3ID/G4AJQ/VA3MCU
Amateur Radio, the origin of the open-source concept!
Skype: TILBURY2591
On 2022-12-05 12:44, Ben Cahill wrote:
Hello Nigel,
I mean listening to the Behrenger's digital USB output,
via an audio app of some sort on your computer, rather
than via Quisk.
Good luck!
-- Ben, AC2YD --
On 12/5/22 09:35, Nigel Johnson MIEEE via wrote:
The line2 by
Behringer does not have outputs, just inputs.?
Nigel Johnson MIEEE