TV interference [RE-wrenches]

[jberdner at sma-america.com]

Frank / Bill:

Inverters with microprocessors must meet the same emissions standards
for both radiated and conducted noise as your home PC.  Many PC's say
they are only Class B rated for commercial applications even though they
are routinely used in residential applications.  Adding the necessary
filtering etc. to an inverter to meet Class A is expensive and also cost
you some efficiency.  The FCC part 15 requirements have largely been
ignored by inverter manufacturers here in the US but they are Federal
requirements nonetheless.   As our market matures I would expect the FCC
compliance issue to become more and more significant.  

Step one in the interference question should be:

Is the interfering equipment FCC compliant for the installation location
?, i.e. residential (Class A = very strict) or commercial (Class B =
less strict).  

If the answer is no then, according to the FCC Part 15 regulations, the
operator of the interfering equipment is required to cease operation.
Obviously this is the extreme position but the folks with interference
would be totally within their rights to demand this.

If the answer is yes, then you start talking about relocating antennas,
filters, etc.  

If you have any questions, or if I can be of any further assistance,
please do not hesitate to contact me.

Best Regards,

John Berdner

SMA America, Inc.
12438 Loma Rica Drive, Unit C
Grass Valley, CA  95945
530.273.4595 (voice)
530.274.7271 (fax) 


-----Original Message-----
From: Bill Brooks [mailto:billb at endecon.com] 
Sent: Thursday, November 21, 2002 9:58 AM
To: RE-wrenches at topica.com
Subject: RE: TV interference [RE-wrenches]

Frank,

The FCC recommendations are always to keep antennas away from noise
sources.
Even if an inverter has passed an FCC class rating does not mean it will
not
interfere. Read the instructions. It says if you experience problems
more or
reorient antennas. You can only filter an SW so much, proper antenna
placement is a better option.

Bill.


-----Original Message-----
From: sunwise [mailto:sunwise at cheqnet.net]
Sent: Thursday, November 21, 2002 9:45 AM
To: RE-wrenches at topica.com
Subject: RE: TV interference [RE-wrenches]


Hey Frank,

It is always the lower channels.  There is actually a pretty big
separation between the lower and upper VHF bands with FM radio coming in
between the two.  If I remember right the separation is between channels
7 and 8 but maybe it is 6 and 7.  I also get some interference on a
favorite FM station that is low on the radio dial (88.9).  Often a
stronger signal will result in less interference and from that
perspective and an amplifier of the type that is installed at the
antenna may help. Of course 75 ohm coax is much better than 300 ohm
twin-lead.

On a similar note does anyone know of an antenna amp that runs off
12VDC?  A radio shack unit that used to work well is no longer
available.

Good luck -- Kurt

-----Original Message-----
From: Frank Fowler, Crystal Pines Alt. Energy [mailto:cpae1 at aol.com]
Sent: Thursday, November 21, 2002 9:15 AM
To: RE-wrenches at topica.com
Subject: TV interference [RE-wrenches]

Hiya fellow wrenches,
Anyone had experience with sinewave inverter interfering with standard
TV
antenna reception? Ever since the antenna was moved closer to where the
inverter/battery bank is located, they have experienced bad reception in
the
lower channels.

SUNcerely,
Frank Fowler
Crystal Pines Alternative Energy
4408 Pine Cluster Ln. Yankee Hill, CA. 95965-9754
Tel:530-532-1972/Fax:530-532-1359
www.solarenergy-alt.com

--
[Non-text portions of this message have been removed]

- - - -
To send a message: RE-wrenches at topica.com

Archive of previous messages: http://www.topica.com/lists/RE-wrenches/

List rules & etiquette: http://www.mrsharkey.com/wrenches/etiquete.htm

Check out participant bios: www.mrsharkey.com/wrenches/index.html

Hosted by Home Power magazine

Moderator: michael.welch at homepower.com

- - - -
To send a message: RE-wrenches at topica.com

Archive of previous messages: http://www.topica.com/lists/RE-wrenches/

List rules & etiquette: http://www.mrsharkey.com/wrenches/etiquete.htm

Check out participant bios: www.mrsharkey.com/wrenches/index.html

Hosted by Home Power magazine

Moderator: michael.welch at homepower.com

- - - -
To send a message: RE-wrenches at topica.com

Archive of previous messages: http://www.topica.com/lists/RE-wrenches/

List rules & etiquette: http://www.mrsharkey.com/wrenches/etiquete.htm

Check out participant bios: www.mrsharkey.com/wrenches/index.html

Hosted by Home Power magazine

Moderator: michael.welch at homepower.com

- - - -
To send a message: RE-wrenches at topica.com

Archive of previous messages: http://www.topica.com/lists/RE-wrenches/

List rules & etiquette: http://www.mrsharkey.com/wrenches/etiquete.htm

Check out participant bios: www.mrsharkey.com/wrenches/index.html

Hosted by Home Power magazine

Moderator: michael.welch at homepower.com

==^================================================================
This email was sent to: michael.welch at homepower.com

EASY UNSUBSCRIBE click here: http://topica.com/u/?bz8Qcs.bz9JC9.bWljaGFl
Or send an email to: RE-wrenches-unsubscribe at topica.com

T O P I C A -- Register now to manage your mail!
http://www.topica.com/partner/tag02/register
==^================================================================