10-11-2010, 08:54 PM
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Join Date: Jul 2006
Location: 6000 feet above the Mojave Desert, Tehachapi, Ca
Originally Posted by radioman2010
Comparing the ERF7530 to the 2SC2879 is like comparing apples to oranges.
The FET is much better for RF use because they are much faster with less loss, thus less heat generated. The FET does not have the poor grounding and oscillations associated with bi-polar transistors which is another plus.
The Palomar 250FET uses 2 of the ERF7530 and produces peak power of 200 watts.
The Palomar 450FET uses 4 of the ERF7530 and produces peak power of 400 watts.
Intial feedback reports are all excellent.
So I don't know what you're talking about when you say the ERF7530 is good for only 20 watts ? Get a clue.
As for the IRF7530, that transistor has nothing to do with the products being discussed.
When one tells another to 'get a clue', one must ensure they have a clue as well.
It was stated 20W RMS was the level to keep the single device at. A pair would then be 40 watts.
YOU stated you get 200 watts PEAK.
I'm going to make the assumption he meant carrier power at 20 watts (which generally would mean 20 watts of AVERAGE Pdiss on the device under AM
100 percent modulation conditions, give or take.. You COULD squeeze 30 out MAYBE).... BUT, that's 160 to 180 watts PEAK.
So, there's your clue for the evening.