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? ?Yes, I use it all the time on AM.? The amplifier will easily handle a 275 watt carrier and modulate it to 100% (assuming the exciter is properly set up to deliver a good AM envelope to the amp, many don't!)? However, at 275 watts you'll have to limit the transmissions to probably 3 or 4 minutes due to heat sink temperature.? This number will vary by your altitude and ambient temperature.? AM operation is VERY inefficient from an RF standpoint on solid state amplifiers (in the teens and low 20s at best at carrier level, increasing a bit with modulation) so it generates lots of heat.? You can extend the safe duration of an AM transmission substantially by reducing the carrier output to around 150 to 180 watts.? I get a good long transmission out of it at those levels.? ?You will only need about 6 to 10 watts of drive to get 200+ watts of carrier and my peak reading meter easily shows 900 to 1kw on modulation peaks.

Hope this helps,

Dennis

N0SP?