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Netnews Marty aa4rm wrote:
PS... now that I've got ur attn, anyone know a 'filter' that hunts out a hetrodyne freq. and nulls it automatically? Hi, Marty I'm the happy owner of a "Magic Notch" filter, which goes between the receiver audio output and speaker. It has a built-in 2 Watt audio amplifier, and requires a 12 VDC wall wart. Per the manual - "It has a switched-capacitor active filter which is scanned through the audio frequencies, and stops scanning when the output drops. The filter then phase-locks to the interfering signal and tracks any varitions in its frequency until it disappears." One nice feature is a green LED indicating power on, which turns to steady red when the filter is ready to notch out a heterodyne. The filter is a small grey box, with a bypass switch and a phone jack. It was a product of "j-Com", but I bought mine from Ramsey Electronics, Victor NY, who I think took over the j-Com line. They also made the much more complicated "W9GR DSP II" audio filter, which includes an automatic notching filter, and was featured in Sept 1992 QST. 73, Ed Knobloch |
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