The HD4660 is a QUAD full HD DVBT modulator with multiple input types.
It multiplexes 4 video sources onto one DVBT carrier. The unit features programmable
channel and network names, adjustable RF output parameters (Normal, Inverted, and C.W.),
adjustable logical channel numbering (LCN) and adjustable attenuation are standard features.
The unit's front-mounted LCD displays the unit status and all adjustments are made via an easy to use WEB GUI.
Brochure Here

Source Inputs: HDMI / YPbPr /CVBS
Input Channels: 4
Video HDMI 1.4 / YPbPr / CVBS
Video System HDMI: 480i/p, 576i/p,720p,1080i/p- MPEG4
MPEG2- 576i and 1080i only on HDMI.
YPbPr: 1080i, 720P, 576i/P,480i – MPEG2 or 4
CVBS: 576i- MPEG2 or 4
Video Input Level 1.0 V (pp) 
Audio Input Level 6.0 V (p-to-p)
Audio System 2 (Stereo) / HDMI

Connections HDMI / YPbPr / CVBS
Video HDMI IN: HDMI Connector 
Video and Audio L/R: RCA Female
RF Output: 1 DVBT carrier RF output, F female, 75 ohm

Compression HDMI / YPbPr/ CVBS
Video HD HDMI: H.264, MPEG-4 AVC/ HP@ L4.0
Video SD and HD YPbPr: MPEG-2 / MP@ML or MPEG-4 AVC/ HP@ L4.0
Video SD CVBS: MPEG-2 / MP@ML, MPEG4.
Video Resolution output 1080P maximum on HDMI only,
1080i,730p 576i, fonYPbPr, 576i on CVBS for MPEG4
Video Resolution:output 576i maximum on YPbPr/CVBS/HDMI only for MPEG2
See Resulution chart HERE
Video Bit Rate: 6 Mbit/S Max.
Audio: MPEG 2, MPEG-2 or AAC
Audio Bit Rate: 384 Kbit/s
DVB Insertion Tables: SDT, NIT
Editable Field Service Name, TS ID,
Network ID, Original NET
ID, LCN, Network Name

RF Output
1 Multiplexed DVBT digital TV service
Frequency: 177 – 858 MHz
MER: 35 dB, typically
Output level: 100 dBuV Maximum
RF Level Adjustment 0 dB to -30dB (70 to 100dbUv out)
Attenuation step: 2 dB