write-up also mentions that power out is 10 Watts up to 10mhz, falls off to 2 Watts at 30mhz.
It is tough to drive IRF510's at 30mhz, but the WA2EBY amplifier uses two IRF510's in push-pull
like this to give 40 Watts up through 30mhz from a 28v supply. Perhaps we can borrow some of the
WA2EBY design to approach that kind of performance. May require beefier caps and coils.
And maybe an additional driver stage. http://www.golddredgervideo.com/kc0wox/wa2ebyamp/amppart1.pdf http://www.golddredgervideo.com/kc0wox/wa2ebyamp/amppart2.pdf
Also in the hfsignals uBitx write-up: "TIA".
Not found in most dictionaries.
Means "Termination Insensitive Amplifier" http://w7zoi.net/bidirectional_matched_amplifier.pdf
On Sun, Dec 10, 2017 at 10:18 pm, AndyH wrote:
Just the close the circle, so to speak. Farhan has additional comments in the sales write-up for the µBITX:
The power chain uses four common plastic 2N3904s in push-pull as drivers. The 2N3904s have enough gain at 30 MHz. The 2N2219s tried earlier were found to have low gain at higher frequencies.