[Amps] SB220 "A" mods

[Pat Barthelow]

Jan and Group,

I think you are all in agreement actually...  Jim's operative word there, is "System" 
Speakers when used, are assumed to be connected to active electronics, which
invariably include diode junctions, and are connected to long conductors which are very good antennas, that conduct RF 
into active electronics, sooner or later, and various forms of rectification and amplification take place, resulting often in 
the speaker, which in and of itself may not have rectification capability, responding with sound, to strong RF fields.
Often in the US, you can buy a pair of  computer speakers with active, powered amplifiers inside for under $15 US.
At that retail cost, they can hardly be expected to incorporate good engineering so as to resist strong RF fields.

All the best,
Pat Barthelow    (916) 315-9271
aa6eg at hotmail.com
http://www.jamesburgdish.org


> Date: Sat, 29 Mar 2008 18:33:34 +0100
> From: sm2ekm at telia.com
> CC: Amps at contesting.com
> Subject: Re: [Amps] SB220 "A" mods
> 
> No it can NOT. I persist! I don´t think I have to explain what
> a speaker is, it has been clear to me for 50 years.
> 
> 73 SM2EKM
> ---------------
> W7RY wrote:
> > Sure it can! A computer speaker system can surly rectify RF. The speaker 
> > system contains and amplifier using an IC or several transistors, 
> > voltage regulators and diodes. It also has wiring and an associated 
> > power supply which also contains the above parts.
> >  
> > Please... Tell us why a computer speaker cannot rectify RF?
> >  
> > 73
> > Jim W7RY
> >  
> > 
> >     ----- Original Message -----
> >     *From:* Jan Erik Holm <mailto:sm2ekm at telia.com>
> >     *Cc:* Amps <mailto:Amps at contesting.com>
> >     *Sent:* Friday, March 28, 2008 11:38 PM
> >     *Subject:* Re: [Amps] SB220 "A" mods
> > 
> >     Sorry but no. A speaker can not "rectify" RF.
> >     Lets not start another wives tale.
> > 
> >     73 Jim SM2EKM
> >     ---------------------------------------------
> >     bob finger wrote:
> >      > Its  the pc speakers rectifying.