[hpsdr] The Reversed T2 transformer on Penelope Revisited

[Scott Cowling]

Hi Mike,

The short answer is - yes, you will get closer.

The long answer is - how much closer?  You *will* be closer, but you 
will have to try it to see if it is *sufficient* for your needs.

Be very careful with heat on T2 or you will melt it.  I have found 
that the best way is to first use solder-wick to remove as much 
solder as you can on all of the pins. Then you can use a sharp X-acto 
knife to gently pry up each pin while applying some heat.  When you 
have it loose, straighten the pins back out and re-solder it down.

It is not hard if you are careful and patient.

73,
Scotty WA2DFI


At 05:04 PM 2/1/2011 -0800, Mike F wrote:
>***** High Performance Software Defined Radio Discussion List *****
>
>I have just finished incorporating a power amp and low pass filter 
>assembly from a Yaesu FT-900 into my HPSDR system (Note:  This is an 
>extremely straight forward incorporation.  I can supply details to 
>anyone interested.).  The system works great with this setup, but 
>the PA is rated at 100 watts and I am only able to drive it to 60 
>watts using Penelope without Pennywhistle.  I was operating on 20 
>meters and after setting the PA gain in PowerSDR to 38 for 20 meters 
>I reached 60 watts with the slider at 18 and had no increase after that.
>
>I have read the wiki entry about the reversed T2 problem on Penelope 
>and have verified that my T2 is reversed.  My question is:  Will 
>reversing T2 provide me with sufficient drive on 20 meters to get 
>closer to the 100 watt level?
>
>Thanks
>
>Mike, K7SR
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