[BC] Harris SX-1 Spur Problem

[RLO2L@aol.com]

In a message dated 11/30/2005 8:57:59 A.M. Central Standard Time,  
radioranger at comcast.net writes:

If you  shut
down the transmitter and feel the 10 amp fuse holders some will be  warmer
than others--- sometimes almost too hot to touch.  Replacing  the fuse cures
the problem for a month or so, until another 10 amp fuse  blows. 


What you are describing here sounds like poor connection in the fuse  
holders! Is it possible to insert an in-line current meter in series with the  fuse 
to determine the actual operating current?
 
If you have a high resistance connection in the fuse holders, corrosion  etc. 
this may be a clue.
 
It is curious that the manufacturer places two fuses of differing current  
capacity in series. 
This may be a "safety fusing arrangement," in that for low current shorts,  
only the low amperage fuse goes. If it is a cataclysmic failure one of both  
fuses will go.
 
In the telephone business we used low current indicator fuses "across," the  
higher ampacity fuses to indicate when for example, a cartridge type fuse 
blew.  The indicator fuses were tied into the central office's alarm system and 
would  alert the supervising office of a fuse failure.
 
 
Russel L.  O'Toole, P.C.
R&M Consulting

31 Ponderosa  Drive
Romeoville, Illinois 60446
815-372-1990 voice
630-699-2965  cell
815-886-9232 fax
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