Author
|
Topic: [solved] Receiving strong sigs 12.KHZ (Read 14188 times)
|
|
WD8BXS
alter Hase
 Offline
Posts: 286
|
 |
Re:[not solved] Receiving strong sigs 12.KHZ
« Reply #60 on: 01. September 2018, 15:12:32 »
|
|
Tested with this new firmware,
Same results although at a much lower volume level.
It is visible on the scope now
Chuck
|
| « Last Edit: 01. September 2018, 15:13:44 by WD8BXS » |
 Logged
|
Thanks,
De WD8BXS vy 73
|
|
|
DB4PLE
positron
Urgestein
Offline
Posts: 1278
|
|
Re:[not solved] Receiving strong sigs 12.KHZ
« Reply #61 on: 01. September 2018, 17:53:52 »
|
|
Hi Chuck,
please answer in detail for the "new" firmware:
3.4 khz Filter: Is the issue noticiable? And if yes, how does it compare to the "official" firmware?
Same for 3.6 and 3.8 khz individually.
Sorry for not asking precise enough in the previous post.
Thank you!
Danilo
|
|
Logged
|
|
|
|
WD8BXS
alter Hase
Offline
Posts: 286
|
|
Re:[not solved] Receiving strong sigs 12.KHZ
« Reply #62 on: 01. September 2018, 21:57:35 »
|
|
It sounds that the volume goes to about 1/2 on 3.6 and 3.4, then gets a little bit louder on 3.2
But not as loud as the previous firmware.
Thanks,
Chuck
|
| « Last Edit: 01. September 2018, 21:57:57 by WD8BXS » |
Logged
|
Thanks,
De WD8BXS vy 73
|
|
|
DB4PLE
positron
Urgestein
Offline
Posts: 1278
|
|
Re:[not solved] Receiving strong sigs 12.KHZ
« Reply #63 on: 01. September 2018, 22:23:18 »
|
|
Hi Chuck,
now let me tell what I did:
3.4 filter: completely unmodified compared to normal firmware
3.6 filter: used a more powerful decimation filter which is normally used on F7 and H7, but not on F4
3.8 filter: completely unmodified compared to normal firmware
So the expected result would have been: 3.4 no change (i.e. issue is noticable as before), 3.6 a change (or no change if issue is not related to the decimation filter itself) and 3.8 no change (i.e. issue is not noticable).
But anyway, from here as I said, the DSP specialist have to be called in, this is out of my league.
73
Danilo
|
|
Logged
|
|
|
|
WD8BXS
alter Hase
Offline
Posts: 286
|
|
Re:[not solved] Receiving strong sigs 12.KHZ
« Reply #64 on: 02. September 2018, 00:14:20 »
|
|
Thank you Danilo, glad to have you here!!
I am sure someone will figure it out!!
DE Chuck, 73
|
|
Logged
|
Thanks,
De WD8BXS vy 73
|
|
|
F4HTX
schon länger dabei
Offline
Posts: 66
Scotty, energize...
|
|
Re:[not solved] Receiving strong sigs 12.KHZ
« Reply #65 on: 02. September 2018, 11:57:37 »
|
|
Hi Chuck, Hi Danilo,
Thanks for Chuck pointing out something, On my side I did tenth of tests to try to isolate something reproductible, but nothing until now...
I can confirm I experienced exactly the same results as Chuck with the filters, and with the "special" firmware, I did not notice significative audible difference.
Best Regards,
François
PS : By the way, the problem is still existant on my D2.9.50 mchf freshly resetted, with no modification of any parameters. This lead more to firmware than configuration issue.
|
| « Last Edit: 02. September 2018, 12:13:33 by F4HTX » |
Logged
|
|
|
|
F4HTX
schon länger dabei
Offline
Posts: 66
Scotty, energize...
|
|
Re:[not solved] Receiving strong sigs 12.KHZ
« Reply #66 on: 02. September 2018, 12:57:19 »
|
|
Hi Friends,
Trying to narrow the scope, I did some more digging. Here are the results.
For each iteration, I repeated precisely this same process :
1. Standard usb key firmware update
2. F1, F3 & F5 All Defaults parameters reset
3. no change in anything except :
3.1 I changed the band and frequency to track my -73dBm / 10100kHz test signal
3.2 and, indeed, I changed the bandwidth in order to check for the birdies
I iterated by dichotomy the firmware versions and get back pointing to 2.9.9 / 2.9.10, as in a previous thread where I thought wrongly it was a Rx IQ autocorrection problem ( https://www.amateurfunk-sulingen.de/forum/index.php?board=19;action=display;threadid=1120 )
So, with the process I described earlier :
- 2.9.9, no filter problem
- 2.9.10 it's a mess with 6kHz birdies (try it)
I hope this might help to pinpoint in the code.
73's
François
|
|
Logged
|
|
|
|
|
|
F4HTX
schon länger dabei
Offline
Posts: 66
Scotty, energize...
|
|
Re:[not solved] Receiving strong sigs 12.KHZ
« Reply #68 on: 02. September 2018, 13:31:52 »
|
|
Hello Andreas,
I just did the exact same procedure as in my previous post with 2.5.57 : not a single birdy overhere !
Except @+24kHz because the "Rx IQ Autocorrection" is off by default.
This issue is starting to be really fun.
I did not look in details the STM cpu family, if we get different results with same procedure, might it be something related to minor version of the chip ? Sometime manufacturers adjust details without widely advertising...
Best Regards,
François
|
| « Last Edit: 02. September 2018, 13:32:11 by F4HTX » |
Logged
|
|
|
|
|
|
F4HTX
schon länger dabei
Offline
Posts: 66
Scotty, energize...
|
|
Re:[not solved] Receiving strong sigs 12.KHZ
« Reply #70 on: 02. September 2018, 15:05:55 »
|
|
Hello Andreas,
My point was to try to identify if the issue appeared with a specific firmware version using the Default Settings, not an infected configuration (in order to identify a reproductible path exhibiting the 12kHz issue).
So, in my specific case, the issue exists on a mchf with a reseted to defaults configuration only with firmware > 2.9.9. Then the filter settings affects the 12kHz birdies.
I tried to restore an infected configuration to a reseted 2.5.57, but unsuccessfully because :
Detecting if UHSDR is connected:
... could not find a connected UHSDR with extended CAT commands (required)
So it would be necessary to upgrade to get the extended cat, then restore an infected configuration and downgrade to 2.5.57. In this process, I can not perform the Default Parameters reset...
My knowledge of the uhsdr software architecture is minimal but without the reset to defaults parameters, I am not sure in exactly which status mchf will really be.
Let me know if it's relevant to proceed this way.
I am available to do any test which might help the cause 
Best Regards,
François
|
|
Logged
|
|
|
|
|
|
F4HTX
schon länger dabei
Offline
Posts: 66
Scotty, energize...
|
|
Re:[not solved] Receiving strong sigs 12.KHZ
« Reply #72 on: 02. September 2018, 15:24:09 »
|
|
Re Andreas,
Sorry, I missed this very interesting point you mentioned :
And when I take my normal configuration, it is gone on all devices. I can only get it when I inject an infected config.
I am not sure what it does mean.
If you perform :
1. Standard usb key 2.9.50 firmware update
2. F1, F3 & F5 All Defaults parameters reset
3. no change in anything except injecting a test signal in your mchf
After this process my mchf shows the filter/birdies issue. Does yours too ?
With this minimal process our two mchf's should be in exactly the same state. If we do not have the same results here this is quite interesting.
73's
François
later PS : Sorry Andreas our responses crossed.
|
| « Last Edit: 02. September 2018, 15:28:25 by F4HTX » |
Logged
|
|
|
|
F4HTX
schon länger dabei
Offline
Posts: 66
Scotty, energize...
|
|
Re:[not solved] Receiving strong sigs 12.KHZ
« Reply #73 on: 02. September 2018, 15:32:01 »
|
|
Hello all,
Because Devil is in the Details, overhere the mchf's having the 12kHz issue do not have the RealTime clock enabled (no hardware mod). Who knows...
François
|
|
Logged
|
|
|
|
|
|
|
|
|
