Hi Ed, a couple years ago I lived in small house so my home theater systems
(HTS) was installed in my radio room as well, I have also a Polkaudio subwoofer
in my HTS, whenever I transmit I turned the sub ON and heard the hum on my
voice peaks, I cured with some clamp ferrites on the signal cable (the one goes
from the amp to the sub) did this first on the AC line with no difference at
all.
Hope this help.
Sergio, xe1ct.
--- El vie 12-dic-08, Ed Richardson <ed_richardson@shaw.ca> escribió:
> De:: Ed Richardson <ed_richardson@shaw.ca>
> Asunto: [RFI] RFI to a Home Theater System
> A: rfi@contesting.com
> Fecha: viernes, 12 diciembre, 2008, 7:04 am
> Hello
> My neighbor has a Polk subwoofer as part of his home
> theater system.
> Unfortunately any time I transmit with more than 40W of
> power on any
> frequency from 1.8 to 28 MHz, it is audible through the
> subwoofer.
> Working with the neighbor and the local Industry Canada
> office, we have
> found that the field strength is approximately 1.8
> Volts/meter.
>
> Every time the transmitter is turned on, the subwoofer
> thumps and
> distorted voices or CW or rtty keying can be heard. We were
> also able to
> repeat the problem using an FRS radio, less than 1 watt of
> power @
> 462MHz, in the same room as the PSW12.
>
> We have isolated the problem to the sub. Disconnected from
> the receiver
> with only the AC cord plugged directly into the wall outlet
> or through
> an ICE AC/EMI filter, the results are the same.
>
> We have tried placing snap on ferrite cores (Mix 31 and 43)
> products
> from the Fairite com on the LFE cable and on the AC power
> cable. No
> improvement.
>
> We have wrapped the power cord around mix 31 torroids for
> filtering with
> no improvements.
>
> Is there any further things than can be done to shield this
> subwoofer
> from RF interference?
>
> Industry Canada says that the amateur station is clean, and
> operating
> within all regulations, is properly grounded and filtered.
>
> Other neighbors with powered sub woofers are not
> experiencing any
> problems. One loaned the affected neighbor another brand
> product and it
> did not receive the interference.
>
> Any suggestions or advice on further things to try would be
> appreciated.
> The neighbor of course does not want to buy a new sub.
>
> ed
>
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