[Date Prev][Date Next][Thread Prev][Thread Next] - [Date Index][Thread Index][Author Index]

Re: serious S-band Interference problem

Hello the Net,

My perspective is a bit different.

The interference you are getting during your licensed ham radio 
operations needs to be stopped.

The 2.4 GHz band is not a private band, but a public band, where no one 
is entitled to privacy.
The 2.4 GHz ISM band is not like the cellular bands where, by law, 
people can expect privacy

As a licensed operation, you have priority over any unlicensed operation 
within the ham band.

As a public band, you can record anything you hear. And use it in an 
evidentiary role.

A mobile system on 2.4 GHz with a directional antenna can achieve the 
ability to locate the nearby offending telephone signals.
The antenna could be the patch feed from your dish or one of the PCB log 
periodic antennas available from RAMSEY.
A low noise preamplifier would be helpful to start, but may have to be 
removed as you get closer.

A FT-817 with a DRAKE or other receive converter with a 2M IF sounds 
like a nice setup.

Use a IF rig that can indicate the signal strength. The hotter the 
signal the closer you will be to the offender.

Triangulate the signal line of bearing (LOB) from a few locations. look 
for where the LOB's intersect on a map.

I would record the interference, locate the offender, then discuss with 
the offender the issue of radio interference
to licensed emergency radio communications.

Most offenders are reasonable and do not know of the interference and 
when informed will permanently cease operations.

If the offender does not believe you, play back the tape without 
commenting  about the activities discussed on the tape.

Never put yourself in a position where your personal security is 

Refer all problems to your local RFI/EMI team.

Stan, WA1ECF

Steve wrote:

>	It was pointed out to me that it is illegal to record or even listen to
>cordless phone calls. I checked and that is indeed true. I have destroyed
>all recordings.
>	I wonder how I'm to resolve the interference problem when I can't actually
>listen to the interfering signal? The signal is in an amateur band that I am
>licensed to use. I think I'll write Riley and see what he thinks.
>>I have a similar phone...used it as a signal source on several d/cs...just
>>unplug the phone line and pick it up. The best part is that these are
>>usually multi channel. It may disappear on it's own soon enough.
>>73, Drew, KO4MA
>	You've given me an idea. I wonder if I couldn't modify one of these phones
>to act as a beacon. Can you tell me what the  manufacturer and model of your
>2.4ghz signal generator is?
>	re. multi-channel operation. I haven't heard the phone tonight, so maybe
>there's hope.
>>Chances are she'll decide she needs to keep her $19.95 phone and contact
>>the legislators to enact a law where hams can't use the band anymore.
>>Just my 2¢ worth ...
>>73 de JoAnne WB9JEJ
>	Since I can't actually listen to the signal, there's no way I can prove
>that it's interfering, hence the cordless phone user owns the band. They
>don't even need to pass a law.
>Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
>To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org

Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org