I have found KCOM filters very effective at cutting out telehone RFI.
I have found that the KCOM handset filters do interfere with the
proper operation of some cheap telephones. I have not run into any
problems with the KCOM line filters.
73,
Steve
AA4AK
K2 S/N 5383
At 02:34 PM 4/17/2006, Vic K2VCO wrote:
I've collected a large number of DSL telephone filters from various
installations. Someone recently suggested that they can be used as
ham RFI filters, since they are supposed to isolate the telephone
from the DSL carrier. Although the DSL signal is much lower in
frequency than ham signals (I believe 10-100 KHz, correct me if I'm
wrong), I thought it would be worth a try.
I tried four different types of DSL filter and compared them to a
KCOM RFI filter designed for 3-30 MHz. I transmitted 100w CW on 7
MHz into a vertical. With no filters, the keying could clearly be
heard. The KCOM filter was quite effective, suppressing most of the
interference. The DSL filters appeared to have no effect.
So much for that idea.
--
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco
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