Audio recording of my CF's chain drive
Posted: Fri Apr 03, 2009 4:32 pm
Ok folks -- here it is. An MP3 file containing a recording made by placing a small microphone just behind the chain drive case of my CF Electric and going for a drive.
http://www.frontiernet.net/~jfletcher/griffon.mp3
Total running time is about 16 minutes. Here's a reference list of what the van was doing at particular times during the drive:
00:00 Leaving parking spot at house, driving up steep driveway to street level
00:40 Clearing the top of driveway, accelerating down side street
00:58 Right turn onto another side street
01:32 Come to dead stop, then right turn onto main street, accelerating to about 25 mph on level grade
02:30 Start descending gradual downhill grade
~03:10 Start climbing uphill grade
~03:30 Start descending long downhill grade
05:05 Right turn at stop sign, then accelerate to about 25 mph on level grade.
06:50 Climb short, steep hill to highway intersection.
07:14 Come to dead stop at highway intersection, wait for traffic to clear, then left turn onto highway, accelerate to about 45 mph (highway is basically level grade)
09:40 Slow down and turn into gravel turn-around area, wait for traffic to clear
10:11 Turn back onto highway, now going back opposite direction. Accelerate to 45 mph.
12:45 Slow down and make right turn from highway onto side street, then accelerate to about 20 mph going up gradual hill
13:40 Stop sign, then left turn onto main street and ascend gradual hill, then level grade at about 25 mph
14:47 Left turn onto side street leading to my house
15:18 Enter driveway slowly, proceed down steep hill to level area at house
15:50 Reverse into parking spot
I'd appreciate if someone familiar with these CFs (Chris? John?) could at listen to at least a few minutes of this recording and let me know if you think this sounds reasonably normal (can't expect perfect on a 25 year old van). I have no experience with a "known good" CF Electric drive system... it sounds to me like this one makes a lot of noise, but maybe they always sounded like this?
If you like technical details, the mic was a Shure SM11, recorder was a Nagra IV-L (full track) running 7.5 ips (unknown type of tape, whatever was on that 5" reel). I used the automatic recording level control on the Nagra. Recording was digitized using an M-Audio Audiophile 2496 sound card, saved to a 44.1k/16 bit mono .wav file, then encoded to MP3 using LAME.
- John
http://www.frontiernet.net/~jfletcher/griffon.mp3
Total running time is about 16 minutes. Here's a reference list of what the van was doing at particular times during the drive:
00:00 Leaving parking spot at house, driving up steep driveway to street level
00:40 Clearing the top of driveway, accelerating down side street
00:58 Right turn onto another side street
01:32 Come to dead stop, then right turn onto main street, accelerating to about 25 mph on level grade
02:30 Start descending gradual downhill grade
~03:10 Start climbing uphill grade
~03:30 Start descending long downhill grade
05:05 Right turn at stop sign, then accelerate to about 25 mph on level grade.
06:50 Climb short, steep hill to highway intersection.
07:14 Come to dead stop at highway intersection, wait for traffic to clear, then left turn onto highway, accelerate to about 45 mph (highway is basically level grade)
09:40 Slow down and turn into gravel turn-around area, wait for traffic to clear
10:11 Turn back onto highway, now going back opposite direction. Accelerate to 45 mph.
12:45 Slow down and make right turn from highway onto side street, then accelerate to about 20 mph going up gradual hill
13:40 Stop sign, then left turn onto main street and ascend gradual hill, then level grade at about 25 mph
14:47 Left turn onto side street leading to my house
15:18 Enter driveway slowly, proceed down steep hill to level area at house
15:50 Reverse into parking spot
I'd appreciate if someone familiar with these CFs (Chris? John?) could at listen to at least a few minutes of this recording and let me know if you think this sounds reasonably normal (can't expect perfect on a 25 year old van). I have no experience with a "known good" CF Electric drive system... it sounds to me like this one makes a lot of noise, but maybe they always sounded like this?
If you like technical details, the mic was a Shure SM11, recorder was a Nagra IV-L (full track) running 7.5 ips (unknown type of tape, whatever was on that 5" reel). I used the automatic recording level control on the Nagra. Recording was digitized using an M-Audio Audiophile 2496 sound card, saved to a 44.1k/16 bit mono .wav file, then encoded to MP3 using LAME.
- John