For that test (and earlier tests at my home), I tried all three of my Smart Antenna CECB's:
Tivax STB-T8 (Zoran), Apex DT502 (Zoran) and RCA DTA800B1 (Broadcom).
Although I didn't report EVERYTHING I did to keep it simple, I always tried to improve
things using MANUAL mode (if available). I also manually rotated the antennas to verify
they actually form a beam in the desired direction....yup, it's where it's supposed to
be and Signal Quality drops with more than about 15-degrees rotation.
At home, I successfully tested both antennas with my old Sylvania 6900DTE HD-STB.
With the Tivax, on EITHER antenna, I could frequently find a better solution by tweaking the
electronic steering commands via the CECB's MANUAL controls (one or two points to the RIGHT).
But since I rescanned prior to each test, the DT-502 problem you reported would not be visible...
and I'm always look to tweak whatever settings the box comes up with anyway....
Fortunately (???), I only have a few channels that can be picked up by the low-gain
Smart Antennas, so shorter search times....
PS: Suspended antennas in recent test were stabilized with a second rope so they
weren't moving.... Obviously they can't be blowing about in the wind....
There is no doubt in my mind that these CECB's control both the DTA-5000 and ANT2000
to automatically find a good solution (except final MANUAL tweak in Tivax), esp in a
Multipath Rich environment (my house indoors)....and in side-by-side comparisons
(as I reported) the DTA-5000 was roughly equivalent to a 4-Bay for UHF, readily beating
the tiny Loop Antenna on a set of Rabbit Ears (the REAL competition indoors).
Just because Antennas Direct found some technical "violations" of CEA-909 that caused THEM
problems doesn't prove anything one way or the other as to how the various CECBs work with
the DTA-5000 (which was the ONLY antenna available at the time), nor the RCA ANT2000,
which presumably was developed and tested with AT LEAST an RCA DTA-800A (Zoran) CECB
and the RCA DTA-800B (Broadcom) CECB, which came out long before the ANT2000 was released:http://www.nabfastroad.org/
Nor did Antennas Direct outright state that the CECB's were totally incapable of controlling
their (partially debugged) Smart Antenna....oh, it's too fast for the way WE want to do it....
One of their other excuses was lack of CECB's with CEA-909 I/F during their development/test period,
but they should have located a Sylvania 6900DTE HD-STB....the ORIGINAL CEA-909 implementer....
Since they elected to get into the Smart Antenna business by bidding on the NAB FASTROAD development
contract, surely they should have realized they would need to buy (or borrow) an STB with CEA-909 I/F,
and perhaps work with the CECB manufacturers to identify and resolve these issues as they came up....
When someone is having problems, don't look for someone (else) to blame....
Work with NAB and CECB manufacturers to either fix the spec or get
the CECB manufacturers to fix their non-conforming boxes (which are
expected to actually MEET the CEA-909 spec if they elected to include it).
Of course, anyone with an RCA DTA-809 or any other CECB is free to do their own test and post it....
Everyone has a different set of on-air test conditions.....