--- On Mon, 11/3/08, OZ1AXG Flam <oz1axg.nospam@dxmail.dk> wrote:
>>I made some final modifications this weekend to lower the
>>temperature of the transistor, and that worked very well.
>>
Since there have been literally hundreds of these preamps built using the
values shown on my web page, one has to wonder why one would be different.
I have a half dozen or so of these things in use at this QTH and none of them
get that hot. The unit I use for 160 meters has been powered up and running
24/7 for the last seven years or so with no issues. (FWIW, it is NEVER
disconnected from the Beverages, not during TX and not during storms)
I would suggest that a better technical approach would be to discover why one
would be different than all the rest rather than make arbitrary modifications.
On the other hand, if there is no compelling reason to have excellent 3rd order
intercept and IMD performance, I guess there is no practical reason why one
shouldn't modify to suit.
73, Larry
Larry - W7IUV
DN07dg - central WA
http://w7iuv.com
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