whiteswan

Paul, it was in a MS manual I downloaded last February after receiving a 56xx sound project from John at Youchoos to go into a N gauge Revolution 56xx loco that had the fast chuff problem. By reading that version of the manual that's how I discovered the CV393 as the answer after John couldn't help. If I remember correctly in the version of the manual I downloaded back in February the CV393 was shown clearly on one page of the manual but greyed out in the second entry so I just experimented with and it brought the chuff rate back within bounds. I did notify John of the result at the time. Thanks for the expanded explanation of how it all ties together. Caz

Yes, I'm one of the few but it pays dividends sometime. ;-)

I reported this some while ago on another forum, here's copy of my reply " Finally the piece de resistance, I've sorted the chuff rate problem. As well as CV158 bit 4 it seems in the MS series there is an additional CV setting for chuff rate in CV393 bit 6=1. The CV393 bit 6 set to 64 gives a 4 times reduction in the chuff rate taking it back to normal figures. It is on page 37 of the MS manual, it is greyed out but is active.

Someone has made one in N gauge on the N Gauge Forum, see http://www.ngaugeforum.co.uk/SMFN/index.php?topic=22623.msg388617#msg388617 http://www.ngaugeforum.co.uk/SMFN/gallery/41/231-180616155155.jpeg

Info now posted on the NGF http://www.ngaugeforum.co.uk/SMFN/index.php?topic=30036.msg339733#msg339733

Although I'm successfully using the signals with DCC (see my previous post) this has given me the idea to use some of the Peco PL-26 passing contact lever switches for the branch line mounted near the signalled area, this will then satisfy any manual operators who like to see and use levers, then I'll have the best of both worlds. ;-) Caz

If it's of any interest, I've had half a dozen of the Dapol GWR signals running on a Digitrax & R&R TrainController DCC controlled layout for the past month without any problems. They are operated via a CML DAC20 accessory decoder (usually used for points), the closed and thrown outputs are linked together and go to one side of the coil of a SPNO 12v relay, the common output of the accessory decoder goes to the the other side of the relay coil. The DAC20 provides feedback to the system and R&R via LocoNet as to the state of any signal at startup each session. Whenever a thrown or closed command is issued the relay (substitute for the push button) closes the Dapol signal operate circuit without fail. Because of this, once you have sync'd the signal (I use thrown for signal off and closed for signal on) it has never once lost sync with the requested operation. If ever it should fail, I'd do exactly what I'd do if a point failed to throw, just issue the command manually from the DCC controller. Using vero board, half a dozen 12v SPNO relays and some terminal strip I've made up a board that links the accessory decoder to the signal yellow operating wires. Caz

, Chris, I think I've found a single pole normally open relay on Rapid Electronics web site http://www.rapidonli...ure-relay-74442 , looks as though this will do the job. Caz (Also replied to Chris on the Yahoo N Gauge group but thought I post this link here as it may be useful to others)