Another white noise recipient
Brian, Stein, Mark, et.al.
I've written on this before with no resolution, but since we're on the subject, I'll take another run at it.
I've got 2 of the PM3000's. One in an RV-9A thats been flying a couple of years now and one in my new RV-8 that I've got a grand total of 10 hours on.
They both have a TON of white noise. With any headset you care to use (more noticable in the Zulu's because it just got a bunch quieter).
I've basically just lived with it in the 9, but when I was building up the panel for the '8 I decided to look into this. I built up the harness and installed the intercom and there was the hiss. Soooo, I took it out and put it on the bench and started debugging. I hooked up a power supply, headset and radio. HISS. I got rid of the radio, HISS. I got rid of the power supply and put in a battery, HISS. I built a harness with exactly 3 wires 6 inches long, power, gnd, headset audio, HISS. I tried different headsets, HISS. I tried passive headsets, HISS. I tried my walkman headphones..... You get the idea.
I'm thinking that the output amp just has a fair amount of hiss!
I'm a EE although electronics isn't the primary thing I do, but I don't see anywhere that I've introduced this. Its just in the intercom. I've let several other pilot/engineers listen to it and they all think its on the high side.
Let me be clear. The intercom works GREAT. But its not as quiet as it should be. The hiss does NOT disappear once the motors running. I can plainly hear it. I can turn the headset volume on my Zulu's down and the intercom volume up. That will raise the signal to noise and help push the hiss down and the expense of volume range.
It just seems that it should be better than this. Especially for stereo with music.
I hate to throw rocks, especially since the intercom part of the deal works so well, but I'm a two time customer with two hissing units at this point.
I'd like to help figure this out instead of just bitch about it.
![Wink ;) ;)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
Let me know if I can help in that regard.
Hey Stein,
I know...And that is exactly what I am doing...Gettin her done!
I have had this on the back burner since it is not the highest priority right now with trying to get flying by sometime in March and with how busy we are at work.
Mark is obviously eager to ensure customer satisfaction and wants me to drop in with the intercom. I would love to visit his facility but everything just gets in the way...