In article e1G6b.380978$Ho3.57571@sccrnsc03,
says...
Class B airspace is used where there is heavy traffic, which is when VFR
codes are typically suppressed. My advice is only to make a phone call
before laying down your cash.

I don't think I understand this. Do you mean...

1) VFR codes are suppressed WITHIN class B airspace? Normally, there
wouldn't be any VFR codes in class B airspace, as aircraft with these
codes would not be allowed to enter.

2) VFR codes are suppressed beyond the perimeter of the Class B
airspace?

3) VFR codes are excluded in the "30 nautical mile Mode C veil" (some
Class B areas), where transponders with Mode C are required (with some
exceptions, like for gliders)?

My understanding is the areas around Class B airspace typically have
heavy VFR traffic, and that the controllers want to see all the VFR
traffic so they can keep their IFR traffic clear of the VFR traffic.
Suppressing VFR returns when there is heavy traffic seems very
counterproductive to this goal! Wasn't the Class B Mode C veil
implemented to make the VFR transponder returns more useful to ATC?
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Eric Greenwell
Richland, WA (USA)