[Elecraft] Broadcast band interference

[Jack Smith]

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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