Here is what I have in my notes.

OnI thought this was a menu choice, but it is not.  To mute or attenuate 
the band you're not using press function low to turn this mode on or off.
If I remember right, you press function then low, not at the same time.  I 
just tried it on my radio, press function then press transmit power 
button, this will put other vfo at about half volume while transmitting 
and receiving on main one.  Doing this again puts it back to normal.
73
Butch
WA0VJR
Node 3148
Wallace, ks.


\ Fri, 
6 Feb 2015, Jim Gammon wrote:

> Tom, pressing the function button and transmit power button locks
> and fortunately unlocks the radio.  Oh, it even keeps it from
> transmitting.  Never knew about that function, but it doesn't
> unmute or mute either of the VFO's.  Wow, you learn something new
> everyday.  I have been reading the 590 manual again.  Guess I
> need to read the 71a manual as well.  73, Jim
>
> ----- Original Message -----
> From: Tom Behler <[log in to unmask]
> To: [log in to unmask]
> Date sent: Fri, 6 Feb 2015 08:19:27 -0500
> Subject: Re: Issue with muting or listening to both VFO's on the
> TMV71A
>
> Jim:
>
> If you don't want the receive on the second VFO to be muted while
> using the
> dominant VFO, press the function key, plus the TX power button
> till you hear
> the low beep.  The TX power button is the third one in from the
> two VFO and
> squelch controls.
>
> Does this help?
>
> Tom Behler: KB8TYJ
>
>
> -----Original Message-----
> From: For blind ham radio operators
> [mailto:[log in to unmask]]
> On Behalf Of Jim Gammon
> Sent: Friday, February 06, 2015 1:48 AM
> To: [log in to unmask]
> Subject: Issue with muting or listening to both VFO's on the
> TMV71A
>
> Hello list, I am having a strange thing happen on my 71a which I
> must have
> caused but can't figure out how to undo.  When I am listening on
> my 71a,
> and have the right VFO on a memory either VHF or UHF and the left
> VFO on a
> different memory, and have both squelch knobs turned off, the
> memory that is
> selected will dominate, meaning that if I turn the volume of the
> dominant
> VFO up it will mute the squelch sound of VFO b.  The opposite
> also hapmens.
> I know that it is possible to have both VFO's work at the same
> time without
> either one being muted unless you transmit on one and the other
> is listening
> on the same band.  Does that make any sense? The mute button,
> righthand most
> button on the bottum row,  will select between a and b VFO but
> when both are
> supposed to be active, they are not.  I don't know how to explain
> this any
> better, but maybe one of you TMV71A owners will know what I'm
> talking about.
> Jim WA6EKS
>
>