My radio experience tells me this is probably not an RF problem. If a
transmitter is going to interfere on the RF side, it will generally be
in multiples of the TX freq going up. The other possibility is that the
signal from the APPO is mixing with another 2.4 gig signal producing a
parasitic signal that is doing the interfering.
A TV signal filter from Radio Shack installed right at the TV antenna
may cure the problem. A high pass filter for the APPO may cure it.
Another place noise can come in is via a power line. Try a line
isolator on the line the APPO is plugged into. (you can pick them up at
most electronics surplus stores cheap or from Mouser.com or
Digikey.com.) There are also whole building noise filters for the AC
supply to the building that can be installed at the main breaker box
that can help a lot and are not very expensive.
To determine which type of noise you have, find someone with an
oscilloscope and look at the AC line. If the noise is on the AC line,
you will see it right away. A broadband spectrum analyzer or an
oscilloscope with bandwidth of around 200+ MHz, may help see it on the
RF side if you look at the TV center freq and then power cycle the APPO
so you can identify if it is generating an RF signal that is causing the
interference.
Kevin B. Proctor
Customer Service
Internet and International Orders
Electro Comm Distributing Inc
5015 Paris St
Denver CO 90239
USA
Phone: +1-303-371-8182
800-525-0173
FAX: +1-303-371-8158
800-423-8018
[EMAIL PROTECTED]
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Tom Haynes
Sent: Thursday, November 13, 2003 10:31 PM
To: [EMAIL PROTECTED]
Subject: RE: APPO Interfering with VHF TV?
I forgot to mention that my situation is happening with a Maxrad 8dB
omni
and a Maxrad 13dB flat panel.
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]
On Behalf Of Tom Haynes
Sent: Friday, November 14, 2003 12:29 AM
To: [EMAIL PROTECTED]
Subject: RE: APPO Interfering with VHF TV?
Hi Sam, there are several people reporting TV interference normally
centered
around TV Channel 6 or 7. I have not heard anyone post a successful fix
yet
for this specific problem. I Also have 2 customers reporting TV
problems.
One is my neighbor and one is a customer.
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]
On Behalf Of Sam
Sent: Thursday, November 13, 2003 11:52 PM
To: [EMAIL PROTECTED]
Cc: Bonsalls TV
Subject: APPO Interfering with VHF TV?
Hi Everyone
Here's one I haven't seen here before.....
I am in the process of expanding into a new town. The company who's
tower
I'm using for my APPO is telling me that when my APPO is powered on it
interferes with their TV reception - specifically channel 7 (VHF).
I don't know how 2.4 GHz would bother channel 7 (which is what, 140
MHz?)
but I know the guy who owns the tower, and he woudn't make this up. Plus
he is sharp with computers/electronics. If he unplugs the power to the
APPO the signal instantly clears up. Plug the APPO back in and channel 7
becomes unviewable.
This is important because his business is a TV store and he uses the
off-air signal (channel 7) to demo new televisions to his customers.
The tower is set up like this:
|
My Omni Antenna
|
| 10 feet
|
------- His TV Antenna
|
|
| 60 feet
|
|
|
|
Building with TVs for sale in it
-------------------------------
My omni antenna is horizontally polorized, 12 dB. There are no amps on
my
stuff.
Are there any filters I can get or anything I can do to help prevent
this?
I can move my antenna to a different location in town as a last resort,
but I'd really like to keep it where it's at. But the guy's main
business
where it's at now is selling televisions, and leaving it as-is is not an
option. Would putting the TV antenna above the omni make any difference?
Is there anything else I can to to prevent the interference?
Thanks Everyone!
Sam
Update: I also found out that I'm knocking out Channel 7 all over the
town. (One of my APs is on the local television tower.....) If I can't
fux
this I'll have to move that one too, and that would be devastating. :(
