Richard,

I assume you have the interface cable connected and have set the 
interface menu.   While there is a tune/bypass button on the tuner (top 
row, far right), you don't use it while interfaced to the radio.

With the radio interfaced correctly, use the "tune" button on the radio. 
   Do a long  press on the  "tune" button of the radio and the tuner 
will tune.   Very loud clacking sound, much louder than the clacking the 
internal tuner makes.   When it finds a match and stops tuning, you 
will hear a short beep.    A short press of the tune button on the radio 
will Put the tuner into bypass.   You will hear a beep and (usually) a 
single clunk from the tuner as the relays unlatch (or whatever is going 
on inside the tuner).

Top row, far left button  of the tuner is for ant 1 /ant 2 selection. 
Press to toggle between the 2 antenna ports on the tuner: 1 beep for ant 
1, 2 beeps for ant 2.

The ant 1 and single wire post on the back of the tuner are connected 
together inside the tuner.   You  use one or the other, you can't have a 
coax connected to ant 1 and a wire connected to the single wire terminal 
at the same time.   The single wire terminal will be hot with RF if you 
are transmitting on coax ant 1.  Don't reach back there while 
transmitting.

The LC setting referred to is the inductance / capacitance  values that 
the tuner has chosen when you do a tune.  You can tweak manually if 
needed with the C up and down and L up and down buttons.

73, good luck, if you smell smoke, run.
Steve KW3A

On 1/7/2016 1:07 PM, Richard B. McDonald wrote:
> Hi!
>
>
>
> I have the following two initial questions as I begin to setup my
> MFJ-998:
>
>
>
> 1( How do I toggle between a) bypass mode and b) not bypassed mode?
> I read in the manual that the 998 powers-on in bypass mode.  The
> manual also says Press [TUNE] quickly (less than 0.5 second) to
> bypass the tuner (one beep indicates bypass mode), and that a second
> quick press toggles the tuner back to its last L/C setting (indicated
> with two beeps).  When I press the [Tune] button once, indeed I hear
> one beep.  However, when I press [Tune] again, I do not hear two
> beeps but instead only hear one beep.  What is the "L/C setting"?
> Does that mean it is no longer in bypass mode?
>
>
>
> 2) The manual says that a single-wire antenna is by default "Antenna
> 1."  I do not use a single-wire antenna, but instead use a coax-fed
> antenna.  I have that coax connected to the 998's SO-239 "Antenna 1"
> connection, and nothing connected to the 998's single-wire binding
> post.  Does this make the SO-239 "Antenna 1" the default "Antenna1"
> and not the single-wire antenna, or is there more I need to do to
> make it so?
>
>
>
> 73,
>
> Richard KK6MRH
>