I have HR24-100 and a AM 21. When I scan for my stations, I cannot get about10 stations. With the antenna going directly in to my TV tuner, I get all the stations.Why do I net get all local stations using the AM 21? I am in Cincinnati. Example: I get 9.1 and 9.2 but not 9.3. I don't get 20.1 -20.5
I call Directv and I was finally rudely told, just watch it on your regular TV. There is no reason not all the stations come in because the AM21 is just a plug for a regular antenna,
The AM21 (or AM22) does not really scan off-air for channels the same way your TV set and other "common sense" OTA tuner designs do.
But instead DIRECTV creates downloadable files of OTA listings for your local area code from a database produced and maintained by Tribune Media Services (TMS) and then downloads this file to your receiver(s) over the satellite during the AM21/AM22 setup.
The problem is the TMS OTA datadase has long exceeded the capacity of the system DIRECTV originally designed to produce these files which has a capacity limit of 65,535 TMS ID numbers. Therefore any station with TMS ID exceeding this number cannot be added to the downloaded list file the AM21/AM22 relies on to tune and cannot see it.
There are various work-a-rounds to "trick" the AM21/AM22 into receiving missing channels by entering secondary zip codes of other local markets during the setup. But this almost always results in having to deal with incorrect guide data for them.
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