I like the idea of ARRL testing certain uints,both phones, PCs, and TVs. I
have been waiting for a tech reveiw or something like that from ARRL for
years.
eds
w1zz
At 07:39 PM 10/29/98 -0700, w3am@juno.com wrote:
>
>Gents:
>
>I've had to deal with AM bdcst EMI like this a lot, and one thing I found
>was that one bad/cheap phone or (particularly) answering machine or modem
>can foul up the lines on all phones in the house. This can sometimes
>make an otherwise RFI-tolerant phone go bad. When testing you should
>unplug every single phone/device from all lines into the house, and test
>them one by one. Probably 80% of the trouble I've encountered has been
>related to answering machines and modems. Individual filters on these
>items usually has cleaned up the problem throughout the house. The other
>20% require scuttling the offending phone altogether.
>
>Even with 30KW of hot-steaming AM literally right next door, most of
>these problems can be fixed with filters and cord-chokes. There are some
>phones, though, that are just hopeless. If you got it free along with a
>Time magazine subscription, donate it to your mother in law (it'll reduce
>her time on the phone to the XYL, as a bonus).
>
>Of course, the EMI at higher frequencies may not behave the same. Your
>mileage may vary...
>
>I would like to find a reliable manufacturer/model of EMI resistant
>cordless phones. I've suggested the Sony 900MHz digitals to a couple
>folks, and they haven't come back complaining, but I haven't tested them
>myself. This is something the ARRL could do for us! Test a bunch of
>this stuff every year or so. I know if I was certain I could just buy
>the neighbor a new phone and the problem would go away, I'd buy it in a
>hot minute. FWIW, most of my personal ham/neighbor trouble has been
>handled by plug-in line filters, including the new Radio Shack item. Try
>these first.
>
>73,
>Gary
>--------------------------------------
>- W3AM - Gary Blau -
>- w3am@juno.com -
>- http://www.w3am.com -
>--------------------------------------
>
>On Thu, 29 Oct 1998 10:47:02 -0800 (PST) PD Wintheiser <w0opw@yahoo.com>
>writes:
>>
>> Only 2 days ago I called the telephone company to complain about
>>noxious AM interference on my phone(the AM station is so far away I
>>don't even know where it is). They suggested I put filters on the
>>phone, which I already have. I persisted and they said they would send
>>a repairman out the next day but if they did not find a problem I
>>would have to pay for the service. She suggested I try other phones
>>in the house to see if it was one or all phones. Interestingly, it
>>was only the one phone.
>> I immediately trashed the phone and replaced it. Diode
>>rectification is not a pretty thing to get embarrased over !
>> A suggestion: Loan out to the neighbor a phone you know is free of
>>Rfi and let them see the difference while you run a test. I see no
>>reason to have to buy any neighbor a new phone just because of bad
>>diodes.
>>
>>
>>
>>
>>
>>_________________________________________________________
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>>
>>
>>--
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>>
>>
>
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>
>
>
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