Date: Mon, 27 Nov 2017 09:13:25 +0300
From: Martin Sole <hs0zed@gmail.com>
To: amps@contesting.com
Subject: [Amps] Rotary switch terminology
<Looking for help on naming of switch types.
In the field of rotary switches
If the pole rotates between contacts in a break before make manner how
would you name this?
### called a ... make before break switch. These type have maximum break down
V between adjacent contacts.
If the pole rotates in a make before break manner how would you name this?
## Called a .... make before break switch. These type have the least
breakdown
V between adjacent contacts.
Now the one that has me puzzled, If all the switchable contacts are
connected to the pole contact with the exception of the selected
position, how would you call this?
## Hams call that a ... shorting type switch. switch makers like
multi-tech industries calls them .... a multiple pole rotor. Instead of one
rotor, there will be several rotors, like spokes..all connected to a central
hub.
In extreme rare cases, some will use a solid disc, with a single notch cut
out, this
amounts to the same thing. Some will depict in the schematic a solid disc,
with a
notch cut out, but the actual switch is a multiple pole rotor.
## If specifying a multiple pole rotor it has to be done exactly. U cant
use too may rotors,
and u cant use too few. On my multi-tech industries model 88 switches, they
were originally
single pole rotor types. 10 position switch with 36 deg indexing. After
the 5 pole sequential rotors installed,
only 6 useable switch positions remain. IE: when switch is on 10M position,
the other 4 x rotors are sitting on the
15, 20,40, 80m positions. This is on a 10-15-20-40-80-160m, 6 band amp.
Draw it out carefully on paper, twice,
once for the lowest band, then again for the highest band.
Jim VE7RF
Thanks
Martin, HS0ZED
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