Re: RF power chain mods and improvements..

Jerry Gaffke

That looks very promising!
Looking forward to seeing where this comes out.

A few obvious observations:

The BFR106@1000 is $0.10, the 2n5109 @ 1000 in a to-39 from Central Semi is $1.50.
Those seem excellent choices if they work.
Looking like these fixes to the uBitx might get done for around $5-$10 more in parts cost, no board changes.

That 2n5109  is cheaper than two of the 2n2222a's in a to-18.
Though the DXT2222A-13  in a SOT-89-3  can be had for $0.10 @ 1000
Central Semi has a 2n5109ub in surface mount, they claim it dissipates a Watt, can't find a price. 

I'm fine if it comes to a fourth stage on a small daughterboard placed between T8-5 and RV1.
if that makes upgrading old boards easier.  (I know, broken record.)

Weird that my search of post  didn't find any of these higher Ft NPN's.
Either the Mouser parameterized search tool is not very reliable, or me.

Jerry, KE7ER

On Sun, Jun 10, 2018 at 10:54 am, ajparent1/KB1GMX wrote:
Gain and power line up with a few possible solutions listed:

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