[R-390] R392 RF Deck

[Roger Ruszkowski]

Wes,

The band switch steps. Set this thing by eye ball
as you have the deck upside down on the bench.

It is a summary best judgment call in the end.
Every switch section wiper tab needs to have as much contact area in each switch position as possible as the gear train is tuned from end to end in the megahertz gears while tuning both up and down. Six switch sections and six positions.
36 contacts in sets of six. They all need to make good when in use.

It use to work, a simple part broke, alignment was lost, the broken part has been replaced.
An eye ball call to select the best alignment relation  and a clamp tighten is all that is needed to effect this repair. Do not go poking at switch parts.

Do not try this with meter readings from the top side of the deck.
The switch positions are like the other R390's 5-999, 1-1999, 2-3999, 4-7999, 8-15999 16-31999
The Geneva gear does the timing for the switch change operations.
If the megahertz is 00 then switch position 1.
If the megahertz is 01 then switch position 2.
If the megahertz is 02 then switch position 3.
If the megahertz is 03 then switch position 3.
If the megahertz is 04 then switch position 4
If the megahertz is 07 then switch position 4
If the megahertz is 08 then switch position 5
If the megahertz is 15 then switch position 5

If the megahertz is 16 then switch position 6
If the megahertz is 31 then switch position 6

Roger Ruszkowski


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-----Original Message-----
From: wes Bolin <k5apl41 at gmail.com>
To: R-390 <R-390 at mailman.qth.net>
Sent: Wed, Jun 29, 2016 10:37 pm
Subject: [R-390] R392 RF Deck

My RF Deck has a misaligned S20i Bandswitch.  The shaft clamp broke and the
switch is not lined up for the Mhz Band counter and gears/cams.  I have the
T.O. but have had no success in getting it in the correct position.  Does
somebody have access the the RF deck to take a photo (or Photos) of S201
wafers with a particular front panel Band position?  I appreciate any help.
Thanks
Wes
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