I certainly don't understand the science behind most of this, especially the bulb trick. But I do know that I ended up getting 10's from 7 and 8's by using the bulbs.
I agree 100% with Dale H. that MTH ought to offer a "reasonably" priced adjustable device which will accomplish what the bulb and filters do. If not MTH then some other enterprising individual (maybe there is already is and I am not aware).
Like TMCC, DCS is a great system but it is only great if you can get it work, and that can only happen with a good signal. Some things to correct bad signal stength can be done fairly easily and cheaply while others cannot.
I implemented DCS to an existing layout and unfortunately the days of me crawling around under the layout doing a re-wire are over so I have to reply on these tips and tricks to get it to work. It sure would have been a lot more convenient to have been able to buy a cheap device to help improve signal strength in the beginning.
Thanks,
Ed