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PFM system
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Bob, I never had one of those neat PFM control systems, but a friend did. I really, and I mean REALLY, liked the whistle control feature where you could quill (I think that’s the correct term) the whistle varying the tone/volume and length of the sound. So much nicer than any DCC systems that I’ve seen.
? ? ?Bud Rindfleisch |
开云体育Hi All:
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What is the attached post?in reply to? I've gone through the postings for two days trying to find the original post and thus far I haven't found it.
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Reason for asking: I have a complete PFM "Mini-Sound" system complete with reverb, Quad iV tape deck and two tapes (1 custom). It comes with a PFM 01 bypass filter and a small woofer speaker. I also have some sound module components.?Everything worked fine when I set it up about 2 years ago. I would love to gift all of the above?to someone. Pay shipping.
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Andre Ming
Poteau, OK 74953
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Andre, ? My apologies if my post was misunderstood but Bob W was talking about diode lighting and mentioned the “PFM system” this got me reminiscing about the old PFM throttle “system” and the fact that I liked the way the whistle could be played. I guess a different “system” altogether! This is supposed to be fun right?
? ? ? Bud Rindfleisch |
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开云体育100% agree. The sound quality from the PFM system, in terms of both whistle and exhaust, for my money greatly surpassed anything I’ve heard from DCC. And, the steam exhaust was synchronized to the drivers’ rotation. Have to admit the lack of synchronicity between the audible chuffs and the visible motion of pistons and wheels with DCC systems drives me a little bonkers.?Fred Tolhurst Hilton Head Island, SC On Feb 11, 2025, at 10:03?PM, Bud Rindfleisch via groups.io <BlackDiamondRR@...> wrote:
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DCC has had two ways to synchronize chuffs.? But I don't know if all decoders offered this. One is a "chuff" input that you connect to a switch that is triggered by a cam on a driver axle (and as I recall, that is how PFM did it, as well as how Keller's "Onboard" system did it).? Of course, you have to have the cam and switch and the added wire.? Some have used on optical switch and the "cam" has black and white bands on it. The newest scheme is better and uses Back EMF from the motor and a CV that relates to the ratio of motor RPM to driver RPM.? With BEMF the decoder knows the speed of the motor, and since it has a specific relationship to driver RPM, the decoder can just "do the math."? No cam.? No switch.? No wire. Here is a YouTube showing an example of setting it. Charles E. "Chuck" Kinzer
On Thursday, February 13, 2025 at 02:31:49 PM PST, Fred Tolhurst via groups.io <gftolhurst@...> wrote:
100% agree. The sound quality from the PFM system, in terms of both whistle and exhaust, for my money greatly surpassed anything I’ve heard from DCC. And, the steam exhaust was synchronized to the drivers’ rotation. Have to admit the lack of synchronicity between the audible chuffs and the visible motion of pistons and wheels with DCC systems drives me a little bonkers.? Fred Tolhurst Hilton Head Island, SC On Feb 11, 2025, at 10:03?PM, Bud Rindfleisch via groups.io <BlackDiamondRR@...> wrote:
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