[Top] [All Lists]

[TenTec] Using OMNI VI remote knob for RIT (Repost)

To: <tentec@contesting.com>
Subject: [TenTec] Using OMNI VI remote knob for RIT (Repost)
From: tzivney@gw.bsu.edu (Terry Zivney)
Date: Tue, 07 Aug 2001 08:19:53 -0500
Reposted because reflector archives deleted the
orignal message after the first day.
I love both of my model 301 remote knobs for 
              my two OMNI VI+s. I am considering a modification 
              to the OMNI VI which would let me use the knob 
              to tune the RIT/XIT. 

              In order for this mod to work, I need to know a 
              couple of things. First, I seem to recall hearing 
              that the encoders for the main knob and the RIT/XIT 
              are identical. Is this in fact true? 
              Second, the logic board schematic (where the 
              encoders terminate) show that both the main 
              and remote encoders go directly to the 4077 
              XOR chips while the RIT/XIT one goes first 
              to a schmidt trigger chip for "cleanup". 
              This encoder is also connected through 
              pullup resistors to the +5v line, while the 
              other encoders are not. Does anyone forsee 
              a problem with merely using a 4PDT relay to 
              switch the input to the schmidt trigger chip 
              from the internal RIT/XIT encoder to the 
              external remote encoder? I plan on sensing 
              the LOCK led to drive the relay. The underlying 
              idea is that when staying on one frequency 
              I could LOCK the main frequency and then use 
              the external knob to tune in the various callers 
              when the RIT control is activated. 

              Terry Zivney, N4TZ/9 

<Prev in Thread] Current Thread [Next in Thread>
  • [TenTec] Using OMNI VI remote knob for RIT (Repost), Terry Zivney <=