I also have several receive only filters that are suitable for AM
broadcast suppression. Two high pass filters and a band-reject filter.
More details on those at
http://www.cliftonlaboratories.com/z10020_am_medium_wave_band_reject_filter.htm
http://www.cliftonlaboratories.com/z10022a_high_pass_filter.htm
http://www.cliftonlaboratories.com/z10023a_elliptic_high_pass_filter.htm
The Z10023A is an elliptic filter and provides 45 dB attenuation at 1700
KHz and 1.5 dB at 1800 KHz.
Prices on all of these are in the $70-80 dollar range.
Jack K8ZOA
On 1/14/2013 3:10 PM, Jim Brown wrote:
On 1/14/2013 11:05 AM, Al Lorona wrote:
There are at least two other ways of knocking down interference from
nearby AM
broadcast stations. Each requires the choice of a particular type of
antenna.
The BEST way to kill AM broadcast interference coupled via the antenna
is with a high pass filter. This concept is far from new -- it's been
around since the 1920s. When I lived in Chicago, I used the ICE model
BCB, which is pretty decent. It's rated for 100W. When the ICE
owner/engineer died a few years ago, the company was taken over by one
of the employees under a different name.
WX0B (Array Solutions) was a distributor for ICE, and is selling AM
broadcast filters built by W3NQN. One model is designed for receive
only, so would be used at the RX antenna patch point with a K3. It is
a VERY sophisticated filter, designed for VERY sharp cutoff so it can
eliminate stations at the very top of the AM band just below 160M. It
sells for $225. Another is rated for 150W, with a less sharp cutoff
(but still a VERY good filter), and sells for $189. W3NQN filters are
pretty much the Rolls Royce of filters.
Array Solutions also builds their own RX only filter for $56. The
cutoff is not nearly as sharp nor as deep as the W3NQN filters, but
would likely be sufficient if your interference is below about 1300 kHz.
http://www.arraysolutions.com/Products/BCB%20RF%20Filters.htm
73, Jim K9YC
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