Topband: Antenna matching question

[Tom W8JI]

Wrong reflector, but I disagree completely with this:

> The HV build up was mitigated by the 10pf cap between the 40-20M positions 
> which also reduces arcing on the SB-220 which is a shorting switch and a 
> cap can be adapted to some 160-10M amps.  The right hand one in that photo 
> had the 80-40M contacts replaced and Id bet there was still a carbon track 
> that wasnt removed, you can easily see the deposits all around that wafer; 
> a good sign of a poor repair tech. Originally a sure sign of high VSWR or 
> open relay.
>
> Same style wafers as in the SB-220, Clipperton L , AL-80 family and others 
> that lived on the edge that still arc today. The arcing is usually a high 
> VSWR, open circuit due to relay, way out of tolerance carbon parasitic 
> suppressor resistors, mistuning as was likely the cause on the left wafer 
> on 10M, and CB use since the NCL-2000 was one of their favorites in the 
> 70-80's. Another cause is not knowing how to read the manual tuning 
> instructions and tuning full bore key down in the SSB position. As built 
> it was a 1000W INPUT CW amp and 2000W INPUT PEP on SSB. That is about 
> 600/1200W output respectively as was common on many amps of the pre 1500W 
> output era. Funny how they all seemed to be OK before the rules changed 
> and switch configurations werent an easy way out to cast blame.....
>