On Sat, 10 Apr 1999 19:15:39 -0500 bob alexander <realex@flash.net>
writes:
>
>Rich Measures wrote:
>
>> ? I did not state that the arcs occurred during 10m operation. I
>stated
>> that the arcs occurred at the open 10m contacts. The photo of the
>> toasted bandswitch in the QST article "Parasitics Revisited" Sep.,
>> Oct./1990) shows a bandswitch that was damaged during 40m and 80m
>> operation, when the 10m, 15m and 20m contacts were open. In the
>> photograph, the 10m contacts are those with the most damage. The
>20m
>> contacts are the least damaged.
>> - later
>-------------------
>
>I first worked on an SB220 as a Heathkit tech in the mid 70's.
>Since then I've owned, serviced, modified or for some reason had
>my hands inside 20 or 30 SB220s
(not the 200 Rich has tested).
I believe I mentioned that, not Rich. Most of the 220's that I convert to
6M arrive in somewhat working condx so I get a chance to do an HF
evaluation before stripping.
>In the 220s Ive worked on with bandswitch damage that damage
>can be directly attributed to the operator rotating the band switch
>instead of the load control while tuning up. The physical layout
>of the tune, load and bandswitch controls makes it easy to turn
>the wrong knob and cause the "parasitic" damage.
An excellent point Bob as I've caught myself doing just that several
times!
73 Carl KM1H
>73, Bob, W5AH
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