Got a used 238 tuner. What size external cap do you use to extend range
on 160?
> Each of the internal caps that get selected by the switch are 470 pf, so you
> get a little less than 2,500 pf will all of them engaged and the variable
> cap (500 pf) at full. To give the maximum range, you would put a 2,000 pf
> cap external, but a smaller one will work in most cases.
>
That is a good answer. Though, depending on the 160 meter antenna you
are trying to match, you may not need it at all. If you have a 160 meter
antenna with a "not too high" SWR, say perhaps 2:1 or less, and you are
using the 238 to get it just right for your transmitter, it will
probably do it without the added capacitance. I have a 238, without the
external capacitor, and have been able to tune any 160 meter antenna I
have tried so far. I do attempt to build my antennas for a fairly low
SWR without the tuner though.
DE N6KB
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