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Topic: [solved] Receiving strong sigs 12.KHZ (Read 14161 times)
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DD4WH
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Re:[not solved] Receiving strong sigs 12.KHZ
« Reply #120 on: 03. September 2018, 15:10:59 »
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Yes, Francois, we are very interested whether the problem goes away with a fresh codec . . .
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F4HTX
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Re:[not solved] Receiving strong sigs 12.KHZ
« Reply #121 on: 03. September 2018, 16:33:23 »
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Hello Frank, Hello Andreas,
I checked with the bino, nothing to report.
I swap my codec, with one new from an ovi-40 kit : not even a small difference ! All the tests are the same.
Too bad, I really thought we found something...
73's
François
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F4HTX
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Re:[not solved] Receiving strong sigs 12.KHZ
« Reply #123 on: 03. September 2018, 17:04:48 »
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Hi Andreas,
Yes, I don't neither understand the pull'up resistors there. This might slow the edge of the signal because of the consumption. I'll monitor that with the scope.
I'll check that later tonight or tomorrow, family time now.
Nice evening,
François
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S53DZ
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Re:[not solved] Receiving strong sigs 12.KHZ
« Reply #125 on: 03. September 2018, 18:33:59 »
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Andreas et al,
...
You can try leave away R6 and R7 and/or reduce R20...R22. I never undestood the sense of R6 and R7.
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but now I am confused.  You have those pull-up and suppressor resistors on the OVI schematics and it works well for me. But for bug-hunting, yes it is worth trying.
I wonder what can be done on mcHF RF PCB rev04 to equalize the LO I and Q path to get better results. Maybe this can help also here. Although in my case all those spurious signals mentioned here are well suppressed.
As an example, (using -12kHz, 2k3 BPF, CW at input):
10.100 = -47 dBm
10.112 = -114 dBm --> -67 dB
10.124 = -101 dBm --> -54 dB
73 Bojan
EDIT
PS: I suppose pull-ups can help holding the defined levels on bus lines when going between Hi-res state.
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| « Last Edit: 03. September 2018, 18:50:36 by S53DZ » |
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WD8BXS
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Re:[not solved] Receiving strong sigs 12.KHZ
« Reply #126 on: 03. September 2018, 18:38:30 »
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Hello Frank,
I did not video, but injecting a signal at 10.100, I hear the same signal at 10.120.
Restarting codec has no effect!
I do not know what you mean by "your IQ phase and amplitude is perfectly manually calibrated at 10100kHz"
I have no idea what you are talking about hihi
I have never seen this talked about.
I have no other tones , just the one at 10.120.
So my issue must be different from Franks.
I have 2 radios that are doing this.
I can't believe that they are defective codecs.
That would be strange. Maybe there are different codecs?? Different specs??
Thanks,
Chuck
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Thanks,
De WD8BXS vy 73
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DD4WH
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Re:[not solved] Receiving strong sigs 12.KHZ
« Reply #127 on: 03. September 2018, 19:12:28 »
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hi Chuck,
interesting! An unwanted signal 20kHz up the wanted signal would be something new and well worth putting an eye on ;-).
You could help us solving your problem by making a video with exactly the same settings as stated in my post this afternoon.
Otherwise it would be very hard -if not impossible- to interpret whats going on on your machine.
if you only have one unwanted tone 20kHz up the wanted signal, then I am pretty sure you have a totally different issue than Francois.
73 Frank DD4WH
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DD4WH
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Re:[not solved] Receiving strong sigs 12.KHZ
« Reply #128 on: 03. September 2018, 19:18:12 »
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Hi Bojan,
thanks for your report!
I wonder what can be done on mcHF RF PCB rev04 to equalize the LO I and Q path to get better results. Maybe this can help also here. Although in my case all those spurious signals mentioned here are well suppressed.
As an example, (using -12kHz, 2k3 BPF, CW at input):
10.100 = -47 dBm
10.112 = -114 dBm --> -67 dB
10.124 = -101 dBm --> -54 dB
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Yes, thats the kind of performance that is exactly as coded in the digital filters, which have 60dB of stopband suppression.
The equalization of the I & Q path is done in software, no need to tune the hardware! The automatic IQ correction is capable of 65dB sideband suppression. Did you have the automatic IQ correction switched to ON when you did your measurements?
We also have another minor issue, that is being fixed at the moment, maybe your figures can be optimized by that fix, not sure.
Keep tuned!
73 Frank
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S53DZ
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Re:[not solved] Receiving strong sigs 12.KHZ
« Reply #129 on: 03. September 2018, 19:45:16 »
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Frank,
yes, auto RX IQ optimization was ON,
FW was "an old one" .47.
And, hm, this was measured on OVI UI with mcHF v04 RF.
73 Bojan
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WD8BXS
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Re:[not solved] Receiving strong sigs 12.KHZ
« Reply #130 on: 03. September 2018, 21:00:54 »
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OH My, I can't believe I typed that hihi
It was 10.100 and 10.112
SORRY!!!
And I must wonder, if there is a firmware out there that says it has fixed it, wouldn't it be a wise decision to at least have a look at it???
Chuck
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Thanks,
De WD8BXS vy 73
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DB4PLE
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Re:[not solved] Receiving strong sigs 12.KHZ
« Reply #131 on: 03. September 2018, 21:19:41 »
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Hi Chuck,
these guys unfortunately did not release the source code. So there is nothing to look at for us to learn from. I am very disappointed.
This not how open source should be done (and in breach of the UHSDR open source license) and I don't understand why they do this.
73
Danilo
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WD8BXS
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Re:[not solved] Receiving strong sigs 12.KHZ
« Reply #132 on: 03. September 2018, 22:13:55 »
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That is a sad situation. I hope things can get better.
It will be a grand day when this issue is solved.
I hope it can be soon.
I am very much considering sending a radio to Andreas for him to check out.
Chuck
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Thanks,
De WD8BXS vy 73
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DD4WH
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Re:[not solved] Receiving strong sigs 12.KHZ
« Reply #133 on: 04. September 2018, 08:40:39 »
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Hi!
Could please everyone who still has a problem with unwanted signals at 12kHz spacing try the new daily build 2.9.51 and report back here, please?
Thanks in advance!
For the test please use:
* automatic IQ correction ON
* translate + or -12kHz
73 Frank
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F4HTX
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Re:[not solved] Receiving strong sigs 12.KHZ
« Reply #134 on: 04. September 2018, 09:15:33 »
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Hi Frank,
Congrats : 2.9.51 does the trick !!!
No more birdies on my mchf, I checked +/-6 & 12kHz.
Well, it will have to be confirmed by daily use, but birdies are really gone, not even listenable low in the noise.
Now : what did you do 
73's,
François
Edit : I carefully listened in +12kHz RXIQon (same as videos)
10.065 birdy -119dBm
10.077 nothing audible
10.089 motor like noise -109dBm
10.100 as usual signal -73dBm
10.113 nothing audible
10.125 nothing (RX IQ on...)
10.137 nothing audible
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| « Last Edit: 04. September 2018, 09:57:35 by F4HTX » |
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