[TenTec] Paragon backpanel AUX +13.8 fuse

M. P. Haynes k4beh at juno.com
Sat Aug 13 12:43:59 EDT 2005

Hi Ben,

Or even more likely an MFJ tuner that uses a 1/8 inch phono plug to
supply the meter light voltage.  If you disconnect it intentionally or
otherwise with the coax connected and the power on guess what?  You got
it!  Been there, done that!  Really stupid design like a lot of of MFJ


On Fri, 12 Aug 2005 21:36:27 -0400 WB2RHM - Ben Antanaitis
<WB2RHM at ARRL.net> writes:
> Thanks to all.
> Allowing an unprotected external connection to the main power is a 
> poor design point. This was probably compounded by using an RCA male 
> to RCA male cable to the attached device. The exposed RCA male pin, 
> with it's non-current limited +13.8V, was all too easy come in 
> contact with some source of ground where the pin, and the +13.8V 
> power source, became SHORTED causing an OPEN somewhere in the source 
> wiring to the AUX +13.8V connector of the Paragon.
> I will be tracing the path from power source to the external 
> connector. I will add a 32V rated fuse in the line, probably a 500ma 
> quick blow.
> Again, thanks to all who responded.
> 73,
> Ben
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