>
>YO3CTK says
>
>>Ten amps is the PEAK
>
>Whoops! Sorry, Mike is correct. 10amps pk is 7 amps rms so the losses are 87
>watts. Still substantial.
>
>I'm seriously considering silver soldering the taps on the tank coil -
>that's with solder melting at redheat, not the lower melting point stuff for
>ordinary soldering irons.
>
? If one is using a pressurized chassis, by drilling a grid of small
holes in the chassis underneath L1, an updraft is created which cools the
coil. Thus, one can use 6% Ag, 94% Sn solder (eutectic 221 degrees C).
This material is approx. 4 times stronger than Ag/Pb solder, and is more
conductive too. // Apparently, Heath had things figured out pretty well
by putting cooling air on the SB-220 tank and bandswitch.
Rich...
R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures
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