[hpsdr] Penelope Output power problem (HELP PLEASE)

[Steven Doyle]

Hi Gerd,

Don't worry, I'm sure the board was fine when it left you. Maybe it had a 
rough journey to the UK or I may have zapped it with a static discharge. I'm 
sure with everyones help I will locate the problem. If not I may need to buy 
another board from you, if you have any spare.

73s
Steve
G1YLB


----- Original Message ----- 
From: "Gerd Loch" <g.loch at nt-electronics.de>
To: "'Graham / KE9H'" <KE9H at austin.rr.com>; "'Steven Doyle'" 
<steve_doyle at o2.co.uk>
Cc: "'hpsdr'" <hpsdr at lists.hpsdr.org>
Sent: Thursday, April 23, 2009 8:50 AM
Subject: RE: [hpsdr] Penelope Output power problem (HELP PLEASE)


> Hi Steven,
>
> I do not yet understand what could be wrong because I have tested all
> Penelopes for correct output. On 80m I measured at least 500 mW for all
> boards.
> Are the jumpers before (JP3) and after (JP2) the reconstruction filter
> inserted (both to the richt side)?
>
> 73, Gerd
> DJ8AY
>
>
> -----Original Message-----
> From: Graham / KE9H [mailto:KE9H at austin.rr.com]
> Sent: Thursday, April 23, 2009 1:42 AM
> To: Steven Doyle
> Cc: Gerd Loch; hpsdr
> Subject: Re: [hpsdr] Penelope Output power problem (HELP PLEASE)
>
>
> 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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