[Johnson] Johnson Ranger Questions

[Evan]

Been too long since I've owned a Ranger, hi hi.  I believe one of the meter scales is to measure grid current.  As to the fuses, the theory on the different values was that if there were a high transient current the standard/fast blow fuse would open.  A long term, somewhat over current situation would cause the slow blow fuse to open.  Not sure if any other rigs followed this philosophy or not.


73,


Evan, K9SQG



-----Original Message-----
From: Kenneth Goodwin <krgoodwin at comcast.net>
To: Johnson <Johnson at mailman.qth.net>
Sent: Sat, Jul 28, 2018 10:25 am
Subject: [Johnson] Johnson Ranger Questions

Thanks to the assistance provided, I have gotten the Ranger and Courier on
the air.  A few Ranger questions remain however.  There are three meter
scales on the Ranger, none of which are fully explained in the manual.  The
top meter scale (0 - 150 mA) is used for final and modulator plate current
settings and the center scale ( 0 - 10 mA) is the grid current but what is
the bottom scale (0 - 40 mA) application?  Second question, why are their
two different fuses in the AC plug?  The schematic shows fuses F1 and F2
while the parts lists shows F1 as a 3A MDL Fusetron and F2 as a 5A MTH Fuse.
F1 is a time delay/slow blow type while F2 is a fast blow type.  Is this an
attempt to protect against two different current flow fault conditions since
the current is the same in both legs.  Ken K5RG 

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