<P> The new DirecTV HD channels require an H20 / HR20 or H21 / HR21 / HR22 / HR23 / H24 / HR24 set top box (STB). In order to receive the new HD channels (channels added after September 2007), all HD receivers except the HR23 must have a B - Band converter installed . If the converter is not installed, viewers can only receive older HD channels (channels 70--99). The B - Band Converter (BBC) is also not required with the new Single Wire Multiswitch (SWM or SWiM) system, which preselects the satellite and transponder tuning and can feed up to 8 tuners via a single coaxial cable . The "HR" moniker designates the receiver as a HD digital video recorder (DVR) model . </P> <P> Only the H20 / HR20 support direct reception of over-the - air ATSC broadcasts . The H21 / HR21 / HR22 / HR23 / H24 / HR24 receivers do not have a built in ATSC tuner, but the AM21 external tuner is available . In addition, there is HDMI support for HDTVs with an HDMI port . New STBs also support MPEG - 4 standard for HD * Programming . DirecTV also offers the AM21 (an ATSC add - on for the HR21), the HR21 - Pro (an HD - DVR with 100 hours HD or 400 hours SD recording capacity), and an online DVR scheduler . </P> <Ul> <Li> DirecTV Receiver is a common standard - definition model . D12 was the last one produced, as this type of receiver is being slowly phased out, according to DirecTV's February 28, 2008 Investors Info . </Li> <Li> DirecTV HD Receiver (H10 / H20 / H21 / H23 / H24 / H25) is a receiver which can receive an HD signal and broadcast in 1080i resolution . H25 is the latest version . After a 2009 software upgrade, the H2n series is capable of receiving 1080p resolution . The H2n series is also the only series capable of operating with the Whole - Home DVR . </Li> <Li> DirecTV Plus DVR (R15 / R16 / R22) is a standard receiver with a built - in digital video recorder . It contains a 160 GB (new models as of 2010 have a 360 GB) hard disk using the IDE 40 - pin connection and can store up to 100 hours of programming . R16 - 300 is the last of these line of receivers; they are being slowly phased out, according to DirecTV's February 28, 2008 Investors Info . The R22 is a "watered down" HR21 as it can receive MPEG4 and has all the features of the HD DVR, including HD output . However the unit is locked to output standard definition only . In 2010 the R22 is unlocked to output HD output . </Li> <Li> DirecTV Plus HD - DVR (HR20 / HR21 / HR22 / HR23 / HR24), the most advanced everyday - consumer receiver in the lineup, is capable of full 1080p high definition and combines both high - definition and DVR capabilities in one unit . It contains a 320 GB hard drive (500 GB on the HR22, HR23, and HR24) using the SATA interface connection . The DirecTV Plus HD DVR also features Media Share, allowing users to view photos and listen to music stored on their computer (with compatible DLNA server software) on their TV, and Whole - Home DVR Service which allows them to watch any recorded program on any HD or HD - DVR receiver in the house . The HR24 is the latest, with the HR23 being its predecessor . The HR24 like the HR21, HR22, and HR23, lacks an ATSC tuner as the HR20s had, but does support the AM21 external tuner for over-the - air channels . The HR24 can be expanded to 2TB drive on the eSATA port for up to 480 hours of HD and 1,750 hours of SD recording . </Li> <Li> DirecTV Pro HD - DVR (HR21 - Pro), the most advanced home theater receiver with HD and DVR in one unit, has a larger capacity hard drive, better cooling and is rack mountable . The DirecTV Pro HD DVR also features Media Share, allowing users to enjoy photos and music stored on their Intel Viiv processor technology - based PC on their TVs . HR24 is the latest (May 2010). Guide scrolling and channel surfing is much faster than previous models . </Li> <Li> The DirecTV "Genie" Home Media Center HD DVR (HR - 34) the successor to the HR - 24 features the ability to record 5 shows at once, allows for Picture in Picture, and has 1 TB of hard drive space allowing for 200 hours of high - definition recording or 800 hours of standard - definition recording . A second - generation Genie, the HR44, is now available and the HR34 has been discontinued . A new generation Genie, the HR54, has been released . </Li> <Li> The DirecTV H44 "Genie Lite" was released to the public in July 2015 . As delivered, it provides the Genie experience including controlling client boxes and standalone television . With the addition of a specific, DIRECTV - branded hard drive it converts into a five - tuner DVR . </Li> <Li> DirecTV Sat - Go ("Satellite - To - Go") is the world's first portable satellite TV system, conceived by producer Rick Rosner . It combines a receiver, antenna and TV all in one easy - to - carry unit . It was discontinued in 2010 . </Li> <Li> DirecTV DVR with TiVo Service (THR22) uses the same technology as the HR22 but has a TiVo user interface . The interface is currently the older SD one . This DVR does connect to the Internet, but only for TiVo program guide information . Currently the THR22 cannot download program content via broadband . </Li> </Ul> <Li> DirecTV Receiver is a common standard - definition model . D12 was the last one produced, as this type of receiver is being slowly phased out, according to DirecTV's February 28, 2008 Investors Info . </Li>

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