[hpsdr] SDR questions

[Helmut]

Hi Jim,

 

An easy way to check your PEP wattmeter: Select ‘use drive power’ in window
‘Tune’.  Read the figure on your PEP wattmeter. Now select ‘2 tone’ test
either in ‘Linearisation’ or in settings\test (using the same drive power
level).  You’ve to read identical figures, because PowerSDR provides the 2
test carriers exactly 6 dB down of the single carrier level.

If you are using a pre-distortion feedback path with defined attenuation you
can control this procedure on your panadapter. No external wattmeter
measures more accurately than your HPSDR radio!

 

73, Helmut, DC6NY

 

 

Von: Hpsdr [mailto:hpsdr-bounces at lists.openhpsdr.org] Im Auftrag von Jim
Sanford
Gesendet: Mittwoch, 31. August 2016 00:36
An: hpsdr at lists.openhpsdr.org
Betreff: [hpsdr] SDR questions

 

All:

I have been asking a bunch of questions lately, and wanted to share what
I've learned -- before I ask one more question!

1.  I asked about low output from Penny.  My Icom microphones need 8V of
bias; I've learned that the board provides 2.5 volts.  Now that I know
this, I can easily provide.  I have studied the Penny schematic and
verified that if the bias jumper is removed then no damage will occur from
externally applied bias.

2.  I have been provided a great algorithm for adjusting power amplifier
gains, much easier than my 2 wattmeter plan:Â  Run the two-tone test into a
dummy load, and adjust gain to achieve 50W indicated on a wattmeter --
that's 100W PEP.

Thanks to everyone  who has responded to my questions.

I have one more:

I'm running PowerSDRmRx on Windows7 Home Premium.  When I double-click the
application, I get the winders security, "Do you really want to allow the
following program from an unknown publisher to make changes to this
computer?"  If I select "yes", it runs.  How do I make this winders
nonsense go away?  I have already done, right-click ==> properties ==>
Security ==> allow system, administrators and my user account full access.Â
Still, I get the nag!  Any way to make it go away??

Thanks & 73,

Jim

wb4gcs at amsat.org

 

 

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