[hpsdr] Demo / Simulation Mode?

[Jerry Flanders]

I once recorded an i/q file with a softrock rx 
and an early version of flex powerSDR on a 
desktop PC and played it back later on a laptop 
at a radio club meeting. As we tuned across it, 
we discovered one of the guys at the meeting 
actually CQ'ing in a CW contest at the time I had recorded it. Neat demo.

I see that Flex still has an article on this very topic at:

http://helpdesk.flexradio.com/hc/en-us/articles/202118408-How-Do-I-Run-PowerSDR-in-Demo-Mode-

They refer to downloading i/q files from their 
website, but I couldn't find them. Maybe an 
internet search might turn them up. It is 
important to get a file recorded at 48 KHz to 
ensure compatibility with the demo PC's built-in sound card.

Some of Ken's old recordings used to turn up on 
the web, but looks like they have all disappeared. Maybe wayback?

Jerry W4UK

At 10:45 AM 9/8/2014, Ken N9VV (Win-7/64) wrote:
>***** High Performance Software Defined Radio Discussion List *****
>
>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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