[RFI] TVI Question

[Roger (K8RI)]

On 4/24/2013 10:44 AM, EDWARDS, EDDIE J wrote:
> Wouldn't an illegal amplifier used out of the designed bands emit more RF trash than if it were being properly used within the bands it's designed to operate?  Of course, couple this with a susceptible device, and you get "Fireworks"!
>
Not necessarily. The purity of the signal depends on many things, but a 
ham amplifier should be able to work on most frequencies within their 
range with maybe a couple exceptions if operated properly.

A 10 meter amp will usually operate on 11 quite happily with just the Q 
being a bit off.

,
> Getting back to the original post, it seemed to indicate the audio rectification was very brief in duration. Is that right?  Almost like it was a mobile driving by the location of the TV/AV system.  That might make finding the source more difficult than normal.  Ferrites on all TV/audio lines (including all internal speakers) might fix it all up.

It can even be the result of a couple signals mixing so both need be 
present.

However the equipment being off and still having the output is usually 
indicative of either a lot of power, output circuit pickup and 
rectification or both.

More often than not I'd expect poor circuit design and or poor shielding 
of the receiving equipment.

In every case where I've run into output when the receiver is turned 
off, it was speaker lead pickup and rectification.

73

Roger (K8RI)

>
> 73, de ed -K0iL
>
> -----Original Message-----
> On 4/24/2013 9:28 AM, Gary Smith wrote:
>> Sounds like a case of just way too much power and no frequency control
>> of it.
>
> NOT TRUE.  The problem is almost always poor design/construction of the
> victim equipment.  Study my RFI tutorial, previously referenced.  The
> CBer you described may have been running more than the 5W he was
> authorized, but it is VERY unlikely he was running more than the 1.5kW
> we are authorized, and hundreds of thousands of hams around the world
> manage to run that sort of power with no issues if problems in victim
> equipment are corrected.
>
> 73, Jim K9YC
>
> ----------------------------------------------------------------------
> This e-mail contains Omaha Public Power District's confidential and proprietary information and is for use only by the intended recipient.  Unless explicitly stated otherwise, this e-mail is not a contract offer, amendment, or acceptance.  If you are not the intended recipient you are notified that disclosing, copying, distributing or taking any action in reliance on the contents of this information is strictly prohibited.
> _______________________________________________
> RFI mailing list
> RFI at contesting.com
> http://lists.contesting.com/mailman/listinfo/rfi
>
>