Right now I have 6 lights and have ordered the 5 for 1 palmpads and credit card controllers. Im going to buy a transceiver but the house is 10,000 square feet. The range is very minimal which is why i was going to buy 4-5 tm751's but I heard the clash on the line so then decided to get rr501's but then heard they crash also. What options do I have?
A lot of this depends on the layout (single story, two story, other) and construction of your house (drywall, plaster, other). This will determine how far your RF devices can reliably transmit.
The RR501's are polite devices. They should operate nicely
on different house codes. They also have decent reception.
I have never tried more than one on a given house code. In general it's not a good idea to have more than one transceiver on a house code. At a minimum you would get repeated commands which would cause problems with Dim commands.
Can you divide your house into zones? If multi-story, say house code B for the first floor and code C for the second. If your intention is to control any light from anywhere in your house you may need the V572.
...Can palmpads or credit card controllers control 2 lights on 2 house code ex. first button a1 second b2.
Palm pads can only control lights on one house code. They are 4 battery devices with a decent transmit range.
HR12a ManualI don't have a credit card remote, but I believe these can only operate one house code as well. These have a single 3v lithium battery, so I would expect reduced RF range.
KR22a ManualI see Brian has posted the answer to your 4 way question while I was composing this.
I'll finish with a word of caution - 10,000 square feet is a big house. I'm not sure what type of electrical service you have, but you are certain to have many devices that can absorb X10 signals or generate noise the will degrade the transmission. If at all possible, try to put a RR501 on the same electrical phase as the devices you are controlling. If you can do this, you may be able to get by without a phase coupler.