Re: [amsat-bb] 2.4 GHz Noise from Cordless Phones - Update

[Marc Holdwick <n8kwx2@xxxxxxxxxxx>]

Be careful on the 5.8 GHz phones.  I bought one as my 2.4 GHz phone
sometimes interferes with my 802.11 network.

The spec sheet on the VTech that I had bought, said 5.8 GHz one way and 2.4
GHz the other.  So it was NOT a "true" 5.8 GHz phone.  The outer box did not
say anything about the 2.4 GHz half.

Marketeers...

73,

Marc - N8KWX



>

> 
> Recently the FCC helped me get rid of some QRN to my AO-40 downlink.  Here
> is what had been happening lately.
> 
> All three neighbors got refunds on their AT&T phone systems, either from the
> store or from AT&T.  All of these systems were 2.4 GHz cordless systems with
> multiple remotes.  One neighbor bought a 5.8 GHz system with remotes, and is
> causing me no noise.  However, one of the others bought a Siemens 8825
> system (2.4 GHz) that produces the same popping noise as the AT&T phones.
> The other bought a Panasonic KX-TG2383 "Triple Talk" (2.4 GHz) that also
> produces the same noise on our downlink.  (I noticed that this one also
> radiates below 2.4 GHz.  The others may too.)  The bottom line is that any
> 2.4 GHz cordless system with remotes is highly suspect.  The problem seems
> to be the polling that takes place continually as soon as the base is
> plugged into power, whether talking is occurring or not.  My own 2.4 GHz
> cordless does not have the multiple remotes feature, and causes no problem.
> 
> The solution seems to be for the phone users to go to 5.8 GHz.  At least
> that is not an AO-40 downlink band.  As long as the system does not do its
> polling in the 2.4 GHz band (or another of our bands) it should give us no
> problems.  A call to a local Circuit City revealed that they sell three
> multiple remote cordless products that operate at 5.8 GHz, and whose prices
> are about the same as those at 2.4 GHz.  These products are made by
> Panasonic, AT&T and VTech.  IF they do their polling at 5.8 GHz, rather than
> at 2.4 GHz, they should not interfere with our downlink.
> 
> 73,
> Bernie, W4SW
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