[hpsdr] Multiple RX issues

[Bob Cowdery]

Hi Joe,

Well, that certainly explains it and why Rx4 is all zeros. I really
hadn't appreciated that as I took the spec at face value and seeing
CuSDR allowing 7 I thought it must be implemented. Is that a hardware
limitation with Atlas do you know?

73, Bob G3UKB

On 13/10/2014 21:34, Joe Martin K5SO wrote:
> Hi Bob, 
>
> Mercury v3.4 implements a maximum of 3 receviers in the firmware.  
>
> Metis_v2.6, which I think you said you are using, allows for 4 receivers, in principle, but that does you no good on the Atlas-based system as Mercury firmware limits the max number of receivers to 3.  
>
> 73, Joe K5SO
>
> On Oct 13, 2014, at 2:18 PM, Bob Cowdery wrote:
>
>> ***** High Performance Software Defined Radio Discussion List *****
>>
>> Just confirmed that the I and Q data for RX4 is all zeros so that has to
>> be coming out the hardware. Any ideas anyone?
>>
>> 73, Bob G3UKB
>>
>> On 13/10/2014 20:43, Bob Cowdery wrote:
>>> ***** High Performance Software Defined Radio Discussion List *****
>>>
>>> Hi Warren,
>>>
>>> Thanks for the input. I'm only running 48K and I set CuSDR to 48K as
>>> well. I don't think its running out of steam. CPU is about 10% with 4RX
>>> and network about 25%, but only goes up to 27% with 5 RX. Still higher
>>> than I expected though.
>>>
>>> The strange thing is that with 4 RX, the first 3 still work correctly
>>> and there are no dropped packets or sync errors. I've not checked the
>>> actual data of the 4th RX yet but I'm assuming its all very low numbers
>>> close to zero as there is no audio and panadapter flat lines at the
>>> bottom on CuSDR.
>>>
>>> Just to see what happened I tried 6 and 7 receivers, still no dropped
>>> packets, rubbish out the audio and usage 15% CPU 31% network. I still
>>> think something is going funny in the firmware.
>>>
>>> 73, Bob G3UKB
>>>
>>>
>>> On 13/10/2014 19:57, Warren C. Pratt wrote:
>>>> ***** High Performance Software Defined Radio Discussion List *****
>>>>
>>>> Hi Bob,
>>>>
>>>> Perhaps your problem with sync errors when the 5th receiver is enabled
>>>> is that the 100Mbit interface will not support five receivers at
>>>> 384K.  IF you are trying that at 384K, you'll need to back down to 192K.
>>>>
>>>> I'm not sure I understand exactly what you mean about "no data and
>>>> thus no audio."  If you are running PowerSDR, it only generates audio
>>>> for RX1 (and its sub-receiver) and for RX2.  RX3, RX4, and RX5 are
>>>> used for things such as the stitched panadapter, PureSignal, and
>>>> diversity reception.  I'm not familiar enough with cuSDR to comment
>>>> there.
>>>>
>>>> Hope that helps.
>>>>
>>>> 73,
>>>> Warren  NR0V
>>>>
>>>> On 10/13/2014 11:52 AM, Bob Cowdery wrote:
>>>>> ***** High Performance Software Defined Radio Discussion List *****
>>>>>
>>>>> Hi,
>>>>>
>>>>> I've been playing around with multiple receivers on some software I'm
>>>>> writing and something strange is going on.
>>>>>
>>>>> I can direct audio from each receiver to different local output devices
>>>>> left/right/both so I can hear what's going on on each RX. Everything is
>>>>> fine up to 3 receivers, the 4th receiver gives no data and thus no audio
>>>>> and the 5th starts giving sync errors i.e. the 7f7f7f is not where it
>>>>> should be.
>>>>>
>>>>> I installed and ran up CuSDR32 and I get exactly the same result. I
>>>>> can't hear what's going on but RX4 has no panadapter output and RX5
>>>>> continually flashes the sync indicator.
>>>>>
>>>>> I've not updated the hardware for a while, using Metis 2.6 and Mercury
>>>>> 3.4. Anyone know if there are any known issues with these versions?
>>>>> Failing that is anybody getting receivers above 3 working with those
>>>>> versions.
>>>>>
>>>>> Thanks for any help
>>>>>
>>>>> 73 Bob (G3UKB)
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