WDPM-DT is a religious television station

Television station

A television station is a business, organisation or other such as an amateur television operator that transmits content over terrestrial television. A television transmission can be by analog television signals or, more recently, by digital television. Broadcast television systems standards are...

 in Mobile, Alabama

Mobile, Alabama

Mobile is the third most populous city in the Southern US state of Alabama and is the county seat of Mobile County. It is located on the Mobile River and the central Gulf Coast of the United States. The population within the city limits was 195,111 during the 2010 census. It is the largest...

, which broadcast locally on UHF channel 23 as an affiliate of the Daystar Television Network

Daystar Television Network

The Daystar Television Network is an American evangelical Christian television religious broadcasting network headquartered near Dallas/Fort Worth Metroplex in Bedford, Texas...

. Broadcasting from its transmitter near Robertsdale, Alabama

Robertsdale, Alabama

Robertsdale is a city in Baldwin County, Alabama, United States. At the 2000 census the population was 3,782. It is part of the Daphne–Fairhope–Foley Micropolitan Statistical Area.-Geography:...

, the station signed on after the analog signal of WSRE

WSRE

WSRE is the Public Broadcasting Service member Public television station for the Pensacola, Florida viewing area. The station has been broadcasting since 1967....

 (PBS

Public Broadcasting Service

The Public Broadcasting Service is an American non-profit public broadcasting television network with 354 member TV stations in the United States which hold collective ownership. Its headquarters is in Arlington, Virginia....

 channel 23) signed off for the last time on February 17, 2009.

Since the "channel 23.1" series of virtual channel

Virtual channel

In telecommunications, a logical channel number , also known as virtual channel, is a channel designation which differs from that of the actual radio channel on which the signal travels....

 designations already identifies the existing PBS member station's digital subchannel

Digital subchannel

In broadcasting, digital subchannels are a means to transmit more than one independent program at the same time from the same digital radio or digital television station on the same radio frequency channel. This is done by using data compression techniques to reduce the size of each individual...

s, this numbering sequence would not be available to the new station. According to the ATSC

ATSC

ATSC standards are a set of standards developed by the Advanced Television Systems Committee for digital television transmission over terrestrial, cable, and satellite networks....

 standard, WDPM-DT's channel numbers would therefore need to be displayed (using PSIP) using numbering based on WSRE's digital channel number, 31. From sign-on until February 2010, the station displayed as Channel 4.1, which is considered a violation of these standards. This was corrected for several months, but is currently happening again.

The audio of this digital broadcast is also in perpetual clipping mode. The average is about 7dB hotter than current limits of digital broadcast audio and is "breaking up" on all programs. (Oct 2011 referenced)