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. I think the
original caps were 5 kV, but the RF current is very important if you run
high power. Generally, 'doorknob' capacitors are your best bet. Check my
article at :
http://n6ie.com/Ten_Tec_238.html
Ron N6IE
www.N6IE.com
----- Original Message -----
From: "Jim Kjar W0CML" <jrkjar@myedl.com>
To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Sent: Sunday, February 21, 2010 12:18 PM
Subject: [TenTec] 238 Tuner
Got a used 238 tuner. What size external cap do you use to extend range
on 160? I assume you also need at least 5kv.
73,
Jim
w0cml
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