[hpsdr] Penelope Output power problem (HELP PLEASE)

[Graham / KE9H]

Steven:

The gain of the OpAmp output stage is about 23 dB.

So for 1/2 Watt out, you need +27 dBm - 23 db or +4 dBm
into T1 for full output.

Check for about 1 Volt peak to peak at JP2 pin 1 or 2.
Look for about 1.2 Volt peak to peak at JP3 pin 1 or 2.

If not getting that, then look for problem between there and
the DAC.

--- Graham / KE9H

==


Steven Doyle wrote:
> Hi,
>
> I have done some testing and checked the following.
>
> Gert Build Penelope so T2 installed correctly
> Tune Power set to 100
> Drive set to 100
> PA Settings set to 38.8
>
> The output of T1 is 236mV(Peak to Peak) and the output of the 
> operation amplifier circuit is 2.4V(Peak to Peak)  which looks correct 
> to me as I believe the gain is set to 10. Maybe the input (236mV) is 
> low I don't know.
>
> Any further ideas or what these voltages should typically be  ?
>
> thx
>
> Steve
> G1YLB
>
> ----- Original Message ----- From: "Graham / KE9H" <KE9H at austin.rr.com>
> To: "Gerd Loch" <g.loch at nt-electronics.de>
> Cc: "'Steve Niles'" <n5en at wt.net>; "'Steven Doyle'" 
> <steve_doyle at o2.co.uk>
> Sent: Wednesday, April 22, 2009 6:33 PM
> Subject: Re: [hpsdr] Penelope Output power problem
>
>
>> All:
>>
>> On the US built Penelope, and I assume on Gerd's Penelope, the
>> power control loop will start to go unstable, (a very low frequency AM
>> modulation appears on the signal) if you set the PA settings between
>> 38 and 38.6.   This is why I recommended a PA setting of 38.8 or 39
>> rather than 38.
>>
>> --- Graham / KE9H
>>
>> ==
>>
>> Gerd Loch wrote:
>>> Hi,
>>>
>>> The transformer is assembled according to the errata.
>>> All Penelopes were tested for correct output. On 6m however the output
>>> is down to about 120 mW. This is the case for all Penelopes and is due
>>> to the design.
>>>
>>> You can compensate differences in output through "PA-Settings" where 
>>> you
>>> can adjust the gain of the PA. That means a lower value for PA gain
>>> result in a higher output from Penelope.
>>>
>>> If you set all PA-settings to the lowest gain (38) the output is up to
>>> 500mW on 80m and slightly less on the higher bands.
>>>
>>> 73, Gerd
>>>
>>>
>>> -----Original Message-----
>>> From: Graham / KE9H [mailto:KE9H at austin.rr.com] Sent: Wednesday, 
>>> April 22, 2009 2:28 AM
>>> To: Steve Niles
>>> Cc: Steven Doyle; g.loch at nt-electronics.de
>>> Subject: Re: [hpsdr] Penelope Output power problem
>>>
>>>
>>> Yes, if it is one of Gerd's Penelope's, then the transformer should be
>>> installed correctly.  I guess I didn't read all the way to the bottom.
>>>
>>> --- Graham /KE9H
>>>
>>> ==
>>>
>>> Steve Niles wrote:
>>>
>>>> Surely Gerd installed the transformers per the errata... Right Gerd?
>>>>
>>>> Steve N5EN
>>>>
>>>>
>>>> Graham / KE9H wrote:
>>>>
>>>>> ***** High Performance Software Defined Radio Discussion List *****
>>>>>
>>>>> Steve:
>>>>>
>>>>> Is the drive level set all the way to 100 for the test?
>>>>>
>>>>> Also, you need into PowerSDR under
>>>>> SetUp,
>>>>>   PA Settings,
>>>>>        and set all of the PA setting windows to 38.8.
>>>>>
>>>>> This will usually get you up to about 300 mW.
>>>>>
>>>>> If you still want the full 500 mW, refer to the Errata
>>>>> sheet for Penelope in the Support section.
>>>>>
>>>>> http://hpsdr.org/support.html
>>>>>
>>>>> This explains that you must reverse the output transformer to get the
>>>>>
>>>
>>>
>>>>> full rated output.
>>>>>
>>>>> --- Graham / KE9H
>>>>>
>>>>> ==
>>>>>
>>>>>
>>>>> Steven Doyle wrote:
>>>>>
>>>>>> ***** High Performance Software Defined Radio Discussion List *****
>>>>>>
>>>>>> forgot to add that I am running the following versions
>>>>>>
>>>>>> PowerSDR 12Apr2009
>>>>>>
>>>>>> Firmware
>>>>>> Ozy FX2:20090201
>>>>>> Ozy 12
>>>>>> Mercury 26
>>>>>> Penelope 11
>>>>>>
>>>>>> thanks
>>>>>>
>>>>>> Steve
>>>>>> G1YLB
>>>>>>
>>>>>> ----- Original Message ----- From: "Steven Doyle"
>>>>>> <steve_doyle at o2.co.uk>
>>>>>> To: "hpsdr" <hpsdr at lists.hpsdr.org>
>>>>>> Sent: Tuesday, April 21, 2009 10:37 PM
>>>>>> Subject: [hpsdr] Penelope Output power problem
>>>>>>
>>>>>>
>>>>>>
>>>>>>> ***** High Performance Software Defined Radio Discussion List *****
>>>>>>>
>>>>>>> Hi All,
>>>>>>>
>>>>>>> I just received my new Penelope from Gert(thankyou), but I  am
>>>>>>> unable to get anything like 0.5W out.
>>>>>>>
>>>>>>> With the PA gain set to min (38dB) in PowerSDR and the drive level
>>>>>>> set to 100  I am only getting 49mW out on the display when I select
>>>>>>>
>>>

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