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[AMPS] SB-1000 bandswitch damage

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Subject: [AMPS] SB-1000 bandswitch damage
From: (Rich Measures)
Date: Wed, 11 Mar 98 16:45:49 -0800
>On Wed, 11 Mar 98 09:50:41 -0800 Rich Measures <> writes:
>>>I was looking through the Amps archives and I noticed some comments 
>>>damage to the 160-meter padding capacitor bandswitch contact due to 
>>Heath not 
>>>providing a
>>>corona washer.  
>>Corona at 2800pV on a 5000pV capable bandswitch?
>>> Sure enough, my SB-1000 has a burned bandswitch contact in 
>>>this place.  I'd put off fixing it and attributed it to the former 
>>>hot-switching...but maybe that isn't what happened after all.
>>The SB-1000 is essentially an AL-80, and whose replacement parts 
>>>Could someone please educate me with regard to this?  What causes 
>>>problem, and what kind of washer needs to be put where to prevent it? 
>>Replacing the 
>>>contact is going to be annoying (I really don't want to replace the 
>>switch) and 
>>>I only want to do it once!
>>Open160m tune padder switch contacts tend to arc during intermittent 
>>vhf regeneration. at roughly 155MHz.  .......
>VHF Parasitics...highly unlikely.  ...

Carl:  Please explain how  the 100 ohm resistor in the vhf suppressor 
becomes damaged by 80m RF during episodes of intermittent bandswitch 


R. L. Measures, 805-386-3734, AG6K   

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