I'm a heavy user of diversity (99.9% of the time).  I have many different RX
antennas which have differing amounts of gain.  For diversity to work
correctly, I need both antennas to present the same RF levels to both
receivers.  I can make gross adjustments with ATT/PRE, but for fine tuning I
would like to adjust RF Gain with a single fader (balance) control as has
been implemented with SUB AF for AF Gain, instead of having to adjust the
concentric RF Gain knobs.

Page 59 of the manual:

"SUB AF - If set to BALANCE, then the SUB AF GAIN control becomes a main/sub
AF
balance control when the sub receiver is turned on (including diversity
mode). In
this case MAIN AF GAIN controls the AF gain level for both receivers. When
SUB AF is at 12 o’ clock, both receivers will be at full volume (main left,
sub
right). If SUB AF is rotated fully counter-clockwise, you’ll hear only the
main
receiver. If it’s rotated fully clockwise, you’ll hear only the sub
receiver. At
intermediate settings you’ll hear both. A balance control is very useful for
contesting and split operation. But it can also save a lot of AF gain
control
adjustment (i.e., matching main and sub), since MAIN AF controls both main
and
sub receiver audio."

Please consider a "SUB RF" menu option for balancing RF Gain.

73 & Merry Christmas!

Bill
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