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#6
March 25th 12, 05:06 AM
posted to rec.radio.amateur.boatanchors
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Swamping transmitter input to amp
ND4jS wrote: I am attempting to amplify a newly acquired multi elmac transmitter with a henry 2kw. The power of the elmac is too high and i have tried swamping it with a 50ohm dummy load in parallel with the amp. This helped but the input is still a little too high. Any suggestions? On Sat, 24 Mar 2012, Edward Knobloch wrote: Assuming the linear requires 80W input to produce 1500W, you need 20W carrier input to the linear in AM mode. I would replace the 6146 with a 2E26 (same base pin-outs) and lower the screen voltage in the exciter for 20W carrier output. Then, no need for an attenuator and the exciter will run cool. snip On 3/24/2012 5:56 PM, Peter wrote: Ummm why not just lower the screen voltage on the existing 6146 ? Hi, I think changing to a 2E26 instead of just cranking down the screen voltage of the original 6146 for 20W output will result in cleaner modulation. Starving the 6146 that much for screen voltage may produce a varying load to the modulator with plate (and screen) modulation applied. Also, less risk of over-driving and possibly damaging the tubes in the linear if the 2E26 is installed. (A 2E26 costs about $4 new.) Cheap insurance. 73, Ed Knobloch |
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