[hpsdr] Fwd: Re: pihpsdr

John Melton john.d.melton at googlemail.com
Mon Feb 6 03:47:52 PST 2017 

Hi Bob,

This is a tough one to work out.  The interesting thing is that it is 
not just an audio glitch as the waterfall is getting the horizontal bars 
so there is something affecting the IQ sample decoding which would imply 
it is a network problem.

Would it be possible to run tcpdump on the RPi and capture the packets 
across a glitch?

To install tcpdump run "sudo apt-get install tcpdump".
To run it, the simplest way is to ssh into the RPI and run "sudo txpdump 
-w tcpdump.out" and then Ctrll-C to stop it.  The file may be fairly 
large so you may want to put it on something like dropbox so I can have 
a look at it.

-- John

On 06/02/17 11:30, Bob Cowdery wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
> Hi John,
>
> I tried powering it from a 2.5A bench PSU at 5.1 volts. The current 
> draw was under 1A. Unfortunately the issue remained exactly the same 
> so not PSU voltage, current or noise. Pretty sure its not network as 
> other software is clean. That only leaves something on the pi itself 
> but its a clean install with just the updates done and pihpsdr. I can 
> see the disruption frequency increases with sample rate in the same 
> ratio so appears to be something internal but if no one else sees this 
> its hard to know what's going on.
>
> Bob
>
>
> On 2/5/2017 6:27 PM, John Melton wrote:
>> ***** High Performance Software Defined Radio Discussion List *****
>>
>> Hi Bob,
>>
>> I have found some 2 amp supplies are not what they say they are!
>>
>> -- john
>>
>>
>> On 05/02/17 17:48, Bob Cowdery wrote:
>>> ***** High Performance Software Defined Radio Discussion List *****
>>>
>>> Hi Jan. Its a 2A supply so should be fine. I've tried knocking WiFi 
>>> and Bluetooth on the head but no luck so far.
>>>
>>>
>>> On 2/5/2017 5:42 PM, dl2hbj at gmail.com wrote:
>>>> Hi Bob,
>>>>
>>>> I had a similar problem which was gone with a more powerfully power 
>>>> supply.
>>>>
>>>> Jan, DL2HBJ
>>>>
>>>>> Am 05.02.2017 um 09:31 schrieb Bob Cowdery <bob at bobcowdery.plus.com>:
>>>>>
>>>>> ***** High Performance Software Defined Radio Discussion List *****
>>>>>
>>>>> I've got it running on the 7" touch screen now, looks fantastic 
>>>>> but unfortunately didn't fix the blip even after I stopped the 
>>>>> xrdp service.
>>>>>
>>>>> pihpsdr shows about 35%, Xorg 20% and the rest very little. Free 
>>>>> mem about 520K.
>>>>>
>>>>> 73 Bob G3UKB
>>>>>
>>>>>> On 2/5/2017 1:24 PM, Bob Cowdery wrote:
>>>>>> ***** High Performance Software Defined Radio Discussion List *****
>>>>>>
>>>>>> Only 48K works, higher rates are not intelligible. I can run 384k
>>>>>> normally so you are probably correct that RDP is putting extra 
>>>>>> load on
>>>>>> the pi. I do have the standard 7" screen and enclosure which I 
>>>>>> plan to
>>>>>> set up so I will let you know how I get on with that.
>>>>>>
>>>>>> Bob
>>>>>>
>>>>>>
>>>>>>> On 2/5/2017 1:15 PM, John Melton wrote:
>>>>>>> ***** High Performance Software Defined Radio Discussion List *****
>>>>>>>
>>>>>>> Hi Bob,
>>>>>>>
>>>>>>> Do you get the blip regardless of sample rate?
>>>>>>>
>>>>>>> I suspect that the problem is caused by running RDP but not 100% 
>>>>>>> sure
>>>>>>> as I cannot test because I do not run any Microsoft software here.
>>>>>>>
>>>>>>> -- John
>>>>>>>
>>>>>>>
>>>>>>>> On 05/02/17 12:40, Laurence Barker wrote:
>>>>>>>> ***** High Performance Software Defined Radio Discussion List 
>>>>>>>> *****
>>>>>>>>
>>>>>>>> I wasn't getting that on my USB based Ozy. I did find that the
>>>>>>>> behaviour was
>>>>>>>> sample rate and noise blanker setting dependent - if you 
>>>>>>>> selected too
>>>>>>>> high a
>>>>>>>> sample rate it would stop functioning. With my RPI3 I was able 
>>>>>>>> to get
>>>>>>>> 192K
>>>>>>>> samples per second, but with no NB selected; you needed a lower
>>>>>>>> sample rate
>>>>>>>> with NB.
>>>>>>>>
>>>>>>>> Is the behaviour you get affected by sample rate, NB, AGC etc 
>>>>>>>> selection?
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> Laurence Barker G8NJJ
>>>>>>>>
>>>>>>>> laurence at nicklebyhouse.co.uk
>>>>>>>>
>>>>>>>> -----Original Message-----
>>>>>>>> From: Hpsdr [mailto:hpsdr-bounces at lists.openhpsdr.org] On 
>>>>>>>> Behalf Of Bob
>>>>>>>> Cowdery
>>>>>>>> Sent: 05 February 2017 10:46
>>>>>>>> To: hpsdr at lists.openhpsdr.org list <hpsdr at lists.openhpsdr.org>
>>>>>>>> Subject: [hpsdr] pihpsdr
>>>>>>>>
>>>>>>>> ***** High Performance Software Defined Radio Discussion List 
>>>>>>>> *****
>>>>>>>>
>>>>>>>> Hi all,
>>>>>>>>
>>>>>>>> Thanks John for a very nice piece of software. Just put it on 
>>>>>>>> one of
>>>>>>>> my pi
>>>>>>>> 3's running over RDP (latest production version). Listening to 
>>>>>>>> 40m as I
>>>>>>>> write this.  I have a basic Metis system so obviously running 
>>>>>>>> the 'old'
>>>>>>>> protocol. I do notice there is a rhythmic blip every 2-3 seconds
>>>>>>>> which shows
>>>>>>>> as evenly spaced horizontal bars on the waterfall and a rise in 
>>>>>>>> the
>>>>>>>> noise
>>>>>>>> floor on the spectrum. I don't get this with other software. 
>>>>>>>> Sounds
>>>>>>>> like a
>>>>>>>> buffer alignment problem or if this is just me then anyone any 
>>>>>>>> idea what
>>>>>>>> might cause it.
>>>>>>>>
>>>>>>>> 73's Bob G3UKB
>>>>>>>>
>>>>>>>> _______________________________________________
>>>>>>>> HPSDR Discussion List
>>>>>>>> To post msg: hpsdr at openhpsdr.org
>>>>>>>> Subscription help:
>>>>>>>> http://lists.openhpsdr.org/listinfo.cgi/hpsdr-openhpsdr.org
>>>>>>>> HPSDR web page: http://openhpsdr.org
>>>>>>>> Archives: 
>>>>>>>> http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/
>>>>>>>>
>>>>>>>>
>>>>>>>> _______________________________________________
>>>>>>>> HPSDR Discussion List
>>>>>>>> To post msg: hpsdr at openhpsdr.org
>>>>>>>> Subscription help:
>>>>>>>> http://lists.openhpsdr.org/listinfo.cgi/hpsdr-openhpsdr.org
>>>>>>>> HPSDR web page: http://openhpsdr.org
>>>>>>>> Archives: 
>>>>>>>> http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/
>>>>>>> _______________________________________________
>>>>>>> HPSDR Discussion List
>>>>>>> To post msg: hpsdr at openhpsdr.org
>>>>>>> Subscription help:
>>>>>>> http://lists.openhpsdr.org/listinfo.cgi/hpsdr-openhpsdr.org
>>>>>>> HPSDR web page: http://openhpsdr.org
>>>>>>> Archives: http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/
>>>>>> _______________________________________________
>>>>>> HPSDR Discussion List
>>>>>> To post msg: hpsdr at openhpsdr.org
>>>>>> Subscription help: 
>>>>>> http://lists.openhpsdr.org/listinfo.cgi/hpsdr-openhpsdr.org
>>>>>> HPSDR web page: http://openhpsdr.org
>>>>>> Archives: http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/
>>>>> _______________________________________________
>>>>> HPSDR Discussion List
>>>>> To post msg: hpsdr at openhpsdr.org
>>>>> Subscription help: 
>>>>> http://lists.openhpsdr.org/listinfo.cgi/hpsdr-openhpsdr.org
>>>>> HPSDR web page: http://openhpsdr.org
>>>>> Archives: http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/
>>>
>>> _______________________________________________
>>> HPSDR Discussion List
>>> To post msg: hpsdr at openhpsdr.org
>>> Subscription help: 
>>> http://lists.openhpsdr.org/listinfo.cgi/hpsdr-openhpsdr.org
>>> HPSDR web page: http://openhpsdr.org
>>> Archives: http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/
>>
>> _______________________________________________
>> HPSDR Discussion List
>> To post msg: hpsdr at openhpsdr.org
>> Subscription help: 
>> http://lists.openhpsdr.org/listinfo.cgi/hpsdr-openhpsdr.org
>> HPSDR web page: http://openhpsdr.org
>> Archives: http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/
>
> _______________________________________________
> HPSDR Discussion List
> To post msg: hpsdr at openhpsdr.org
> Subscription help: 
> http://lists.openhpsdr.org/listinfo.cgi/hpsdr-openhpsdr.org
> HPSDR web page: http://openhpsdr.org
> Archives: http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/

More information about the Hpsdr mailing list