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3rd December 2007, 01:29 PM
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 Hi forever99482, mvs sarma is right, but if you replace each combined filter with two single resonator filters from Toko you need to include the 47 pF coupling capacitor between the two individual filters as well. The combined filter will be narrower and steeper than one single filter, and it will be close to the original filter. I also think that you should keep the capacitor value at 47 pF, the older filter where mvs sarma refers to is the red one, it also uses a 47 pF capacitor between the two individual filters. But why they use a capacitor with a reactance of 7 k  hm: at 455kHz to couple two filters with in/out impedance of 3 k hm: is alsoa mystery to me. I think only the manufacturer can answer that question. on1aag. | |
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