[hpsdr] Penelope trouble

[David McQuate]

Georg,
   (1) the two tones at 700 & 1900 Hz are so far apart that the 
third-order distortion products probably won't be seen.  If the two 
tones were, say, 800 and 1200 Hz, the third order products would be at 
400 and 1600 Hz--all relative to the (suppressed) carrier.
   (2) the SA resolution BW is so wide that you won't be able to see the 
individual tones.  I think you are seeing the fundamental, and the 
second & third harmonics.  To see the individual tones you'll need to 
set the Res BW smaller than the tone separation.  When you do that 
you'll want to narrow the span.  With the SA center frequency = PowerSDR 
VFO frequency, set the span to something like 10 or 20 times the Res BW.
   (3) With 30 dB of attenuation between Penny and the SA, when you see 
-3 dBm (half a milliwatt) on the SA, Penny's output is +27 dBm or half a 
watt.  I'd say your Penny is working OK.

On the Penelope board itself, there's a row of 7 LEDs near the 122.88 
MHz crystal oscaillator.  The middle 5 LEDs form a bar graph showing the 
digitized output of the output peak voltage detector (U9), in a 
pseudo-logarithmic way.

If all those LEDs light up when you increase the drive, that's another 
indication that you're getting the normal RF power out.

I'm not sure what values PowerSDR uses for the TX meter.

73,
Dave
WA8YWQ

On 8/27/2012 8:50 PM, Georg Prinz wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
> Hello Frank, hello Helmut,
>
> I forgot to mention my firmware:
>
> Penny: 1.7
> Metis: 1.8
> Mercury1,2,3: 3.2
>
> I have no Mic on, VAC disabled, Gain by band reset, Signal generator 
> Tx-mode/Silence/ output
>
> two tone test 700Hz and 1900Hz.
>
> SA HP 8566B: Res BW 100kHz, VBW 300 kHz, Stop 60MHz, Sweep 20msec.
> Input 30dB Attenuater between Penny and SA.
>
> I expect to see the two freqencies plus D3,D7. etc
>
> What I get is one peak at 3.66MHz -3dBm varying down to -10dBm
> next peak at 7.5MHz -62dBm varying down to 70dBm
> netxt peat at 11.34MHz -70dBm
> and so on.
>
> PowerSDR 2.2.3(8/16/12) shows 0W.
>             Sliders AF: 0, AGC gain -20, Drive 100, Mic -42dB, Comp 
> 0dB, VOX 0, DEXP -40, Transmit profile default.
>                                 TXMeter_: FwdPwr
>
> I don`t see any power on TX Meter and only one unstable peak on SA.
>
> Do I have measuring problem?
>
> 73, Georg, dl2kp
>
>
>
>
> Am 27.08.2012 20:50, schrieb Georg Prinz:
>> ***** High Performance Software Defined Radio Discussion List *****
>>
>> Hello to all,
>>
>> I am trying to bring up my Penelope into operation, but .....
>>
>> Using PowerSDR by KD5TFD v. 2.2.2011b: Poweroutput max. = 82mW
>>
>> Using any other PowerSDR v. 2.2.3 : Poweroutput 0W.
>>
>> All programs common is following:
>>
>> Two tone test shows on SA HP 8566B: one big peak and another which is 
>> running along
>> the envelope of the first one. Sometime I get three peaks and the the 
>> left and right one
>> changes his amplitude, which is as high as the middle one.
>>
>> I already changed the position of T2 to the right one.
>>
>> Did I kill my TX?
>>
>> How to proceed?
>>
>> Any one knows???
>>
>> 73, Georg, dl2kp
>>
>>
>>
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