Sweep Tub amps and freq. response
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| Nov 4th 2019, 11:43 | |
gordyburdoTotal Topics: 0 Total Posts: 0 |
Hello all, I have 2 sweep tube amps, a Swan 1200X and a converted Palomar 350Z. Both use 6lb6s in grounded grid. They are both working fine, but I noticed that the output on 75, 40, and 20 is over 400 watts with 100 watts drive. This drops to 380 on 15 and 350 on 10. Is this normal or do I have a problem with the rig? Thanks for any responses and 73, Gordy - WA2RUP |
| Nov 4th 2019, 16:54 | |
W1VTSuper Moderator Total Topics: 0 Total Posts: 0 |
A lot of amps don't do as well on 10M. |
| Nov 5th 2019, 14:06 | |
WB1GCMSuper Moderator Total Topics: 0 Total Posts: 0 |
Sounds like normal power output on the higher bands. 100 Watts drive sounds a little high for such an amplifier. If you can, plot the input power versus the output power, on a graph. Start with 10 watts drive and make a power output measurement at 10 Watt increments (of drive). The relationship between the two should be linear (a straight line on the graph). Near the top of the graph, it should curve (amplifier reaches saturation). Use an input power along the straight line of the graph to operate your amplifier in a linear fashion. Operating at, or past the saturation point will increase (transmit) intermodulation distortion, resulting in an abnormally wide signal. Bob Allison WB1GCM ARRL Lab |
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