The problem, Randy is that they would cost much more than these 222 MHz
Amp project amps are costing. These old TV amps use MRF-151G FETs. I
got the RF decks at no cost and passed along the savings. The additional
parts needed easily added up to $500-$800 and that did not include a
pretty enclosure. The way to go these days is LDMOS and use two devices
(two pallets and a combiner) to get 1500 watts out. I would think a
realistic sell price would be well over $4K. Ham LDMOS amps seem to
suffer from problems so some serious fault detection and protection has
be be engineered in to the circuits. Much of the trouble has to do with
parasitic oscillations over a wide freq range. The 160 thru 6 M amps
tend to suffer. A good design is not simple. Single band VHF amps might
be easier, but they still would be costly in today's world. W6PQL quit
making turn key amps. He still sells pallets so you can roll ur own.
Dave K1WHS
On 1/16/2024 2:50 PM, Randy, N0LD via groups.io wrote:
These amps you are building... too bad we can't convince Down East or
MFJ to produce them.
Randy, N0LD
On Tue, Jan 16, 2024 at 1:26 PM, Dave Buckwalter - K3SK
<k3sk@buckwalter.co> wrote:
Just so you know .... I am still looking for MA & RI to my
northeast, KY to my west and AR to the SW to finish up all states
east of the Mississippi on 222.
de K3SK
FM07th Virginia
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