that is a nice  add-on to the Ten Tec rigs, I had one also, though I 
had to part with it. It used the TSI calculator chip in it for the 
numbers, and worked great!  sure did dig my Ten Tec OMNI B which I 
used that digital readout on.


At 04:44 AM 05/24/13, you wrote:
>All in the ear of the beholder.
>I started out with a johnson valiant.  I tuned the transmitter by pressing
>my ear to the metal case, and listening for the dip in hum.  I tuned the
>grid by listening to the click of the meter needle.  Later I counted the
>dial turns on the drake radios.  Since each turn was 25 khz, you could get
>with in 2 khz or so quite easilly.  I have wondered if a neon light coupled
>to a feed line could be read by an audible light probe.  How good would
>maximum brightness be?  Interesting experiment.  Then in the late 80's I
>bought a triton 4 and found the speech box that tentec made for it.  I
>thought I had died and gone to heaven.
>I have an Omni D and still have that box.  That's a backup radio.
>We've come a long way.
>H T Kaufman MSW LCSW
>Adaptive Technology Instructor