FL-5 Filter[via LSMTP - see www.lsoft.com]

[Fred E Holnagel]

The old cast aluminum cased military range filter from WW 2 Extremely
effective 1020 hz. audio filter. In line between phones and radio will
notch out the offending signal if you tune until it reaches 1020 hz. Old
timers know this one. $10 plus shipping.

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