NCD questions

[Lars Clausen]

Hello Everybody

Somehow i only got an e-mail notification of activity on this thread recently, so that's why i havent replied before now. Sorry about that!

The problem about the EMC seems very strange to me, i have myself a standard NCD sitting right next to my tuner, and it receives crystal clear any station. I would like to swap a module from one of you guys who are experiencing problems, to give a good test in our EMC rig.

We have a special room in our concrete basement (for lowest possible background recepition) where we have installed antennae and a spectrum analyzer.

About the EMC kits, the problem is perhaps that people send me e-mail about getting a kit, and i must admit i am not always quick to forward the e-mail to my shipping crew, to get the goods in the pipeline.
We do have EMC kits in stock ready to send to anyone who might experience an EMC problem, but the trick is just to get the message through to the shipping people.
As you might notice from our website i don't work in shipping, but in development, and that is development of also other projects than you see at NewClassD. So sometimes when i receive a request for shipping an EMC kit, i am sitting on an assignment away from home.

I do however recognize the full resonsability, and so will do something about it.
To correct this i will go ahead and setup the EMC kit as a free product on our website. This way you can 'order' an EMC kit, and this way the word will get right up on the screen of Brenda who takes care of our shipping, and not my crowded mail box.
If you don't want to wait for this, you can also click on the E-mail address listed under 'Shipping' and this is Brenda's direct e-mail.
This way you will see some swift action.
CDL i have just forwarded your request to Brenda, so no need for you to do anything, and sorry about the delays.

[cdl]

Originally posted by Lars Clausen

...I would like to swap a module from one of you guys who are experiencing problems, to give a good test in our EMC rig.

CDL i have just forwarded your request to Brenda, so no need for you to do anything, and sorry about the delays.

Thank you Lars, good to hear from you. Looking forward to seeing whether the kit helps.

You might want to have a look at a 'whole' amplifier with EMC trouble in order to get a better indication of what's going on (or going wrong or whatever)? Just in case something in the implementation might also be contibuting... Let us know how we can be of assistance.

Best, cdl

[Lars Clausen]

CDL: Let me know how it plays out.

I just checked our stock and purchase of these EMC kits, and so far we have had a total of 4 requests for them in the history of our company.

I hope it helps, if not, i will move my spectrum analyserr to you on my next visit to Copenhagen.

[cdl]

The kit was in the mail today - Thanks Lars (and Brenda)

Originally posted by Lars Clausen
CDL: Let me know how it plays out.
...
I hope it helps, if not, i will move my spectrum analyserr to you on my next visit to Copenhagen.

Hope to get it put in during next week, will post results.
Regardless of the outcome, you - and your spectrum analyzer - are welcome, Lars

best, cdl

[bitnissen]

Originally posted by cdl
The kit was in the mail today - Thanks Lars (and Brenda)



Hope to get it put in during next week, will post results.
Regardless of the outcome, you - and your spectrum analyzer - are welcome, Lars

best, cdl

Hi CDL,

Any news on your progress? Have you received and/or tested Lars' kit?
I'm very curious if it solves your (our) problem


Best,
Bitnissen

[cdl]

Haven't gotten around to it yet - and I might need to get some larger ferrites, the ones from Lars are fine but I'm not sure they are quite big enough for my very thick internal speaker cables (Audioquest Indigo...). Will do it soon and post update when I can :-) Actually there was some interference in the radio this morning so the incitament is certainly there!

OT: I guess the real reason I didn't take apart the amp yet is that I'm also renewing the kitchen in my apt., and that my GF just moved in

/cdl

[bitnissen]

Hi CDL and others,

Just a small update on my noise problems, and an attempt to revive the discussion I got the NCD kit mounted today - with the unfortunate result that not much changed
Mounting the kit as described, with the capacitors between copperstrip and LS terminals and a ferrite on the LS-cables inside the enclosure yielded no noticeable change on of the reception of my kitchen radio. Mounting additionally a set of ferrites on the speaker cables outside the enclosure did, however, make a difference. There is still noise on the FM reception but whereas before the music from the NCD amps would play through the radio (albeit distorted and noisy ) it is now the actual FM signal dominating and with significantly reduced noise.


I am a total noob on this subject - could anyone interpret this for me?? Should I try larger ferrites, or are there any other suggestions? There is still quite noticeable noise in the FM reception so an improvement of the 'filter' would be greatly appreciated!


Best,
Bitnissen

[cdl]

thanks for the update, Bitnissen... sorry to hear that you still have trouble :-(
Have you tried a ferrite around the antenna connection? I let my DAB antenna pass through 2 of them, it doesn't seem to attenuate the DAB signal.

I haven't made it further with my ECM kit than putting the ferrites on the speaker cables outside the enclosure, which does have some effect.

What i HAVE done is to separate the antenna and speaker cables as far as possible, which gives trouble-free DAB reception at least, notably better DAB signal. (This was part of an apartment re-arranging ordered by the girlfriend...)

On the bright side, I was fired from work recently (!!!) so now I have a couple of months (with full salary, fortunately) and hope to mount the ECM kit properly. Will update as soon as I can.

/cdl

[cdl]

did you check whether the copper strip has good connection to ground, by the ways? I was thinking the adhesive might insulate it from the case?

/cdl

[bitnissen]

I did not check the connection to the case as I missed the music too much I will look into it soon.

The (for me at least) surprising thing is that the NCD's are located in the livingroom and the radio in the kitchen... Inbetween is a carrying concrete wall!

Anyway, I'm curious to see if the kit has any effect in your case. I just realized that the external ferrite only works for very low volumes on the NCD's - when the music is turned up the radio plays along happily

Best,
Bitnissen