|[AMRadio] Re: How much is too much|
johnmb at nc.rr.com
Fri Jan 19 17:18:09 EST 2007
The little Johnson tuner is more than capable of handling 300W of carrier
into a reasonable mismatch. Trying to tune it by loading into a horrible
mismatch while applying power is a decidedly poor idea with any matchbox
(to say nothing of what the plate dissipation of your PA tubes is while
It would be kind of like whacking a wristwatch with a hammer because it's
rated as "shockproof".... it is, but.......
The Heath tuner you mention is a good one, but with high VSWR, and high
power, any tuner can/will arc. Be easy on the tubes and tuner, and do the
tuning at a lower power, and all will be well. Minor excursions in freq
(and SWR) can be tweaked up during a transmission, but changing bands, or
ends of 80M you'd be wise to back down the power and protect your rig and
tuner (and your blood pressure! :-) ).
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