[hpsdr] Penelope T2 orientation - additional info

[Graham / KE9H]

For TAPR manufactured Penelope boards...

After the rework.

The dot on the transformer should be diagonally OPPOSITE the dot
on the PCB silkscreen. (The silkscreen dot position is in error.)

In other words, when viewing the Penelope board, Atlas connector down,
and BNC connector to the right, the dot on the silkscreen is lower right,
and the orientation of the dot on the transformer should be upper left.

The transformer should be operating as a voltage step-up transformer.

--- Graham

==

n3evl wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
> Bruce made some interesting observations with respect to the correct 
> orientation of the transformer (T2).  Irrespective of the actual power 
> measurements, it seems to depend on a) the pin numbering on the 
> schematic being correct and b) the correct identification of pin 1 on 
> the component.  I'd really like to know the definitive answer here 
> since, with Pennywhistle almost completed,  I waited until _yesterday_ 
> to reverse T2 as per the errata!  Here's hoping I don't have to 
> re-reverse!
>
> Pete, N3EVL
>
>
> Graham / KE9H wrote:
>> ***** High Performance Software Defined Radio Discussion List *****
>>
>> Bruce:
>>
>> That is about the typical performance for a Penelope, with the output
>> transformer oriented correctly.  It will be about 3 dB lower with the
>> transformer reversed.
>> --- Graham / KE9H
>>
>> ==
>>
>>
>> Bruce Beford wrote:
>>> All PA gain settings at 38.8
>>>
>>> Max Penelope output with tune drive at 100 is about 120-150 mW on 
>>> 6M, about
>>> 350 mW on 10M. Readings from powerSDR display consistant with external
>>> calibrated meter.
>>>
>>> Bruce N1RX
>>>
>>>   
>>
>


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