HL2 OpenHPSDR mRX modified for Pure Signal

[Tim Hatch]

Hi All Pure Signal users,

I have spent some time working on updating OpenHPSDR mRX PS.  I have a forked repo at https://github.com/wb0wuq/OpenHPSDR-PowerSDR 

I have been working on several different LDMOS amps using pure signal.  I was getting tired of resetting the SetPk value.  I have modified it to work at "0.2305".  If you are interested please check it out.  Hope that  it will work for you.

Tim

WB0WUQ

[Don Solberg]

Thanks Tim!  I have been using Puresignal with the HL2 for several months and it does get frustrating having to reset the Setpk value every time you restart PowerSDR.  This will also make it easier for new comers to the HL2 to get PowerSDR working.

I have my shack torn apart for a remodeling project so I won't be able to try this out for a couple of weeks.  I am looking forward to using you fork of the software.

Thanks again.

73

Don

K9AQ

[Duncan Clark]

Hi Tim,

Wonderful but ...

For us numpties out their not used to using a github, how to I get at an
install .exe or failing that how to I get your changes into my existing
PowerSDR setup?

Having cracked the Pure Signal value, I don't suppose that whenever you
are really bored and want a challenge you could to have a look at
sorting the use of undersampling at higher frequencies in the
transverter section of PowerSDR for HL2 i.e. 6m and 4m?

From a post I made after Xmas

>>Suffice to say that although the 2m undersampling works with Hermes
>>Lite, using a signal generator, it is not un-surprisingly pretty deaf.
>>The AD9866 is just not designed for use at 145MHz.
>>
>>However at 4m, Hermes-Lite appears to work very nicely. I don't
>>currently have a 4m antenna but my 10m cubical quad is doing a good
>>job of rxing the 0.5W G4JNT 4m beacon 120km away.
>>
>>Now the only niggle left is how to make PowerSDR understand
>>undersampling or if it knows about it, what menu is it hidden in?
>>
>>For 4m I use 6.8MHz for HL2 which gives 70.0 MHz rx. However 70.1MHz
>>would be 6.7MHz and so on. I can tell PowerSDR via the transverter
>>function to display 70MHz in place of 6.8MHz but it tunes backwards so
>>a 70.1MHz signal is displayed as 69.9MHz.

Basically PowerSDR tunes backwards when undersampling.

Now Alan has SparkSDR doing it properly and would be able to say in much
more detail about what needs to happen for PowerSDR to behave properly.

Thanks

Duncan

--
Duncan Clark
G4ELJ

[Steve Haynal]

Hi Tim,

Thanks for doing this! Please feel free to add a link to the wiki. I will try to remember to do that too.

I've had some private correspondence with Christoph DL1YCF. He has been working with some HL2 owners to get PureSignal working with PiHPSDR. He made the good point that the reason for this different 0.2305 setting is that the amplitude of the synthetic TX feedback signal is different from the openhpsdr hardware. I suspect this different because the HL2 makes a number of changes for 12-bit 76.8 MHz sampling. I plan to revisit this DSP chain and check the gain. It may be that we go back to a SetPk value closer to what is expected, and that could improve PureSignal overall. See this github issue.

https://github.com/softerhardware/Hermes-Lite2/issues/141

73,

Steve

kf7o

[Don Solberg]

Tim or Steve,

How do you install Tim's forked version of PowerSDR?  

Don K9AQ

[Don Solberg]

I figured out how to install Tim's forked software.  

After downloading it from Git Hub and extracting the Zip file.  You have to go here:

C:\Users\OWNER\Downloads\OpenHPSDR-PowerSDR-master\OpenHPSDR-PowerSDR-master\Project Files\bin\Release  and then run the PowerSDR application.  The top line of PowerSDR now reads OpenHPSDR mRXPSa V 3.5.1 (03/22/2020)  

The SetPk value is now 0.233

Thanks Tim!

Don K9AQ

[Don Solberg]

I upgrade to Tim's version of PowerSDR on my primary station and it successfully imported my database settings and my TX profiles.  I did however export them before I did the upgrade just in case.  

I won't however be able to fully test the PureSignal because I have my amplifier off-line and am running the HL2 barefoot at this time.  I am in the middle of a major construction project and won't have my full station, with the amp, back on line for a month or so.

Don

K9AQ