RadioBanter - View Single Post

January 30th 05, 06:24 PM

On Sun, 30 Jan 2005 16:06:24 GMT, (Terra
Dactyl) wrote:

For those that have one or have used one, what does a Palomar 300
Elite put out in honest RMS watts with a tone? There appears to be
two versions of the amplifier . The version I am asking about is the
one with two SD1446 transistors, and not the one with two MRF-455
transistors. I'm reluctant to believe anything a Dosey peak meter
says.
I have been playing with one on the bench and the output is flakey.
One moment the meter says 150 watts on sideband with a tone, and
another minute is says about 80 watts with a tone. The broadband
output transformer gets VERY hot on mine, and that is going in to a
1000 watt oil filled dummy load with 1.1 SWR. One of the legs on the
1000 pf capacitor soldered to the broadband output transformer did not
appeared to be soldered well, so I re-soldered it. The amplifier is
now showing about 80 watts consistently, and the output transformer is
no longer getting so hot. I'm just wondering whether I fixed it or
broke it. The two sd1446 transistors check good when I test them one
leg at a time with a diode checker. I am using an average meter to
measure the output.

-TD

http://us.st.com/stonline/books/pdf/docs/2805.pdf