[hpsdr] Demo / Simulation Mode?

[Ken N9VV (Win-7/64)]

Hi John,
the problem that I encountered may be the same as the original poster. 
If you record an I/Q file and then play it back while your rig is 
CONNECTED to your LAN, everything works perfectly well including tuning.

*However* if you record an I/Q file and then try to play it back on a 
stand-alone PC (Laptop) you can not even get the file to start. There 
seems to be something in PowerSDR that requires a LAN connection to a 
real rig - or you *cannot* play an I/Q file.

Then the tuning methods you reference are all correct and 
understandable. The frustration is that you can not even get PowerSDR to 
start in order to play the file that you successfully recorded.

dit dit
73 de Ken N9VV

On 9/8/2014 1:01 AM, John Marvin wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
> What you want might be possible, with one major exception. Are you
> expecting to be able to change the VFO A frequency and hear different
> things? That would be more difficult because when you change VFO A,
> PowerSDR is relying on the hardware to change the center frequency,
> which won't do anything if you are just playing a file, no matter what
> method you use to do it. For that scenario to work you would need
> something outside of PowerSDR doing DSP for you.
>
> If you are OK with a demo mode where you change VFO A and the frequency
> changes but the band display doesn't move (and what you hear doesn't
> change), then that is somewhat easier. If you really want to dial around
> (or click around) and hear different things you could enable either
> click tuning or a subreceiver (MultiRX using VFO B). In those cases
> PowerSDR doesn't change the center frequency using the hardware and
> instead does its own DSP internally to extract the signal (from within
> the signal slice(s) chosen by VFO A). That kind of emulation would be a
> lot simpler to do, but that might not meet your needs.
>
> John
> AC0ZG
>
> On 9/7/2014 4:35 PM, VaibhaV Sharma wrote:
>> ***** High Performance Software Defined Radio Discussion List *****
>>
>> Sorry, but I am still confused here.
>>
>> I need a running instance of PowerSDR / OpenHPSDR with simulated data
>> so that I can demonstrate serial control commands to do the following -
>>
>> * Change VFO frequency
>> * Change filter bandwidth
>> * Start / Stop Radio
>> * Etc.
>>
>> How can I do this with a recorded I/Q file being played back?
>>
>> Here is what I have tried till now -
>> * Recorded my own wav file in PowerSDR recording UI
>> * Played it back but it switches the pan adapter and waterfall display
>> to as if it is transmitting (it does not transmit though)
>> * I can hear the recorded audio back but cannot scroll around the band
>> during playback
>>
>> I also downloaded some pre-recorded I/Q wav files from the web but
>> when I play them back, the waterfall and pan adapter display is all
>> weird. The entire visible spectrum is filled up with incoming
>> transmissions. I can hear the audio fine but the display does not look
>> right.
>>
>> Any suggestions?
>>
>> Thanks,
>>
>> —
>> VaibhaV Sharma
>> W7VAI
>>
>>
>
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