HDMI to multiple TVs - a solution
For our second trip in our 327DS last year, we decided to take the DTV DVR receiver with us. It's a perfect fit in the cabinet above the passenger seat and an RF modulator and RF amplifier let us send an analog quality signal to all of the RF outlets in the motor home. A carry-out dish was used to feed a signal to the DVR using the park cable wire in the rear electrical compartment.
The major problem with this hookup is that we didn't have an HDMI connection to the TV. A second TV will be installed in the bedroom this Summer and we've been looking for a way to get HDMI to both TVs. We just found a relatively simple solution to this that requires no wiring!
We purchased an Actiontec "My Wireless TV" kit. This kit includes one transmitter, one receiver, AC power supplies, HDMI cables, and a remote control for the receiver. The transmitter is connected to the DTV box's HDMI output and has an HDMI pass through connector for a TV located near the box. The receiver has an HDMI output that is connected to the TV's HDMI input. The AC supply's output is 5v @ 2a which means that it wouldn't be difficult to run these units on 12V using a DC-DC buck voltage regulator. These units will transmit all HD signals except 480I. The receivers can be optimized for quality (watching movies) or speed (for games). Actiontec claims a maximum of 150' between transmitter and receiver, but I suspect that's with no intervening walls.
This system supports multiple transmitters and receivers. At least four receivers can be linked to a single transmitter which allows viewing the same program on all of the TVs at the same time. A receiver can be connected to one of four transmitters, letting you use one transmitter for a satellite box and another for another device such as a blu-ray player. The receiver remote control allows you to select which transmitter to connect to. An alternative to multiple transmitters would be to have an HDMI switchbox connecting to multiple HDMI sources but this would allow using only a single device at a time.
The transmitter has a choice of three frequencies in the a and b wifi bands. band a is at 5Ghz while b is 2.4Ghz which usually has interference from wifi networks.
The units are not cheap. The initial kit with both units cost $200 while additional receivers cost $120 at the local computer store. The cost of the units needs to be compared with the cost of running HDMI cables through the motor home. A temporary installation of the units at home has shown that a good signal is available through multiple interior walls. I expect no problems using these in our motor home.
We're currently using the units at home to feed the signal from the DTV box to three TVs on the first floor. The only problems we've found are:
1. There's about a 1/4 second delay between the TV connected to the transmitter and the ones connected to the receivers.
2. When a receiver drops the connection to the transmitter then reconnects, there's a couple of second loss of signal to all TVs. This occurs only when there's a poor signal between the transmitter and receiver. We had this problem with our kitchen TV because the room between the transmitter and the kitchen has metallic foil wallpaper - a bad choice for passing RF signals. Moving the kitchen receiver 5" solved the problem and we now have an excellent signal on that receiver.