[TenTec] Omni VI Keyer Speed Control

[John Huffman]

All -

I got a note from Paul saying the pot is 10K.  Took off the front cover and 
there is plenty of room for a deeper control on the front panel.

Unplugged connector D on the logic board.  It already had the capacitor mod 
installed across the leads.  There is only a brown lead and a purple lead on the 
connector.  The resistance between them is 10K at any setting of the pot.  The 
resistance between either the brown and ground or the purple and ground is infinite.

At the pot there are three leads. Left to right they are brown, white, and 
purple.  Resistance from any of them to ground is infinite.

The resistance from brown to white is 0 counter clockwise and 10K clockwise.

The resistance from purple to white is 10K counter clockwise and 0 clockwise.

I'm thinking a multiple turn 10K pot might be the easiest as I am confused as to 
where I would put resistors.

73 de K1ESE
John

Dr. Gerald N. Johnson wrote:
> On Thu, 2007-01-11 at 12:11 -0400, VE1BN wrote:
>> Hi John -
>>
>> Have not located the pot value on my OMNI 6+ schematic either.
>> Now I'm as curious as you are. My pot covers over full two dial marks 
>> (55 degrees) between 15 and 30 wpm.
>>
>> Not much room for a 10-T pot though behind the panel.
>>
>> Think the best approach is to contact Don Prouty at T-T. Just the 
>> cost of a phone call to find out without having to lay the front 
>> panel down and measure it yourself.  
>>
>> I don't use the built-in keyer, just a CMOS Superkeyer 3 instead.
>>
>> 73 -  Don
> 
> Once you've measured the values that set the limits of the speed range
> you wish, you should be able to use a fixed (or adjustable) series
> resistor to set the high and a resistor shunting the panel variable to
> set the width of the range. I have no idea what the original values are
> though.
>