QUOTE (lordjw @ 22 Aug 2004, 20:02)Well, I will first reply to Sami
I agree that DCC is an old technology BUT ! nowadays you can beef it up with the latest transistor technology. Power FETs have come long way and are greatly improved since the introduction of DCC.
I know that there are better ways for communication such as RF. At present I have NordIC, Siemens and Cypress single-chip RF-tranceivers for evaluation. RF could be superior - BUT ! It is out of reach of regular electronics hobbyist. Also these special modulator chips require some know-how and are also out of reach for regular electronics hobbyist. Sure I have 1GHz oscilloscope and 10GHz spectrum analyzer at work and I'm able to inspect what happens if something goes wrong but regular hobbyist cannot do that. I want to be able to design specs that will enable most of electronics hobbyists to build CarDCC themselves. Lets not be elitistic electronic engineers, lets be realistic and keep things simple for hobbyists.
All systems so far (SCX, Davic, Scalex?, Carrera?) are most propably using DCC type communication so it is very unwise and arrogant for you to state that it doesn't work. In my opinion thousands of RR-DCC hobbyists cannot be wrong either. They really have working systems and RR-DCC works also with slotcars as RC45 has demonstrated. And do you know what chip is inside nearly every decoder ever built? Microchip PIC. You have quite wild claims.
Comments are always appreciated but please try be constructive.
I think that you understand my opinion differently than i. Comments were asked and IMO i just said my comment and without dissing your of anyone others system. This isn't matter of being right and wrong and throwing claims. Simply matter of opinion. PIC's will work, but PIC is too slow and it has too much limits compared to other brands in same price. I have learned it hard way by doing things with it
It is perfect MC for controlling/counting/monitoring things that are not so demanding but when you have to measure, process and transmit datastream it is outdated and creates many limits no matter who uses it in trains or cars. It is simple fact. In my opinion it was constructive fact.
Anyway it is not so important. Second thing is that i don't dream RF technology to be used in hobbiers building projects. IMO such system should work using rails and still there is plenty of easy ways to do it. Enduser just have to know what chip to buy and he will get things going with same knowledge as he builds PIC board if he'd have good instructions. F.E Cirrus has many plug and play s-pdif tranceivers and other stuff. 3Mb/s isn't elitistic goal. I know that many hobbier has built systems (audio, gaming, RC-model airplane etc...) using todays technology without being engineer.
I'm just littlebit suprised of your reaction
I just think that it isn't arrogant or unwise to mention different kind of options for DCC. Sorry
Let's also define DCC. When i'm talking of DCC i mean that it is serial protocol which is used by modeltrain hobbiers. Serial protocol, unmodulated with shared timeslots and without errorhandling.
Only motivation what drives me to think own digital system is that SSD or any other commercial system isn't quite what i expected. SSD is cheap and it will be nice system in home. I think that it is made littlebit further than DCC but it has own limits too which disturbs me. SportWorld will be even more advanced but.. We have plans to build a clubtrack with couple of friends and the digital system must be able to be at least as good as analog system and flexible at sametime. I have also made my homework and done some checking but none of available system supports all needs what we want. So that's why i'm thinking of possibility to desing one myself. That's why i have closed DCC case as a solution.
Time will show what comes up. I hope that you'll make DCC work!