Fred, here is a drawing for a 160M bandpass filter. The first section is a 5
element Chebyshev lowpass filter and the second section is a 7 element
Chebyshev hipass filter. Different values are given for the lowpass portion,
depending if the upper cutoff frequency is selected to be 80Meters or 40
Meters. Either section can be used alone, but these are designed for use in
the 50 Ohm side of the matching transformer.
The drawing is located at:
http://homepages.dstream.net/K0FF/HomebrewTips/160mBandPassFilter
There are kits available for this type thing, as well as the preamp. Anyone
interested, contact me off the reflector, I will pass along details as they
are know to me.
Happy Building, Geo>K0FF
PS comments always welcome.
>
>Hello Topbanders,
>
>
>I have a problem with a near bc-station working on 177kc. This station
>poducing
>interference only on my 2-wire-beverage. Every 5 - 10 kc appearing
>bc-stations,
>somtimes with s7. I think my ferrite-cores are saturatet from the strong
>signal
>on 177 kc (59 +60db on the ft1000d). I am using FT50-77 and FT50-43
>cores.
>What can i do to eleminate my problem?
>
>thank you
>73 Fred, DL7ON
>
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