4/15/2023 0 Comments Sp 600 hammarlundMode of Operation Fundamental Fundamental Fundamental Fundamental 3rd Harmonic 4th Harmonic band and also at the low frequency end of the 7.40 to ,14.8 mc band, it is necessary to specify frequency band as well as Signal Frequency when ordering crystals for exactly 7.40 mc signal operation.Ġ.455000 (see note below) 3.955000 (see note below) 3.955000ģ.955000 and divide sum by 3 3.955000 and divide sum by 4 The oscillator or actual crystal frequency for a given signal frequency shall be determined from the following: The Signal Frequency for which the crystal is to be used shall be stamped on the top of the holder. NOTE: Since 7.40 mc is the signal frequency at which the intermediate frequency is changed for double conversion and since this signal frequency occurs at the high frequency end of the 3.45 to 7.40 mc The holder shall be in accordance with HC-6/U or CR-7. The frequency tolerance shall be within plus or minus. 31473, for use in the Crystal Frequency Control Unit, see page 8, shall be made in accordance with Signal Corps Specification CR-18/U. NOTE: Crystals supplied on soecial order, per Hammarlund Specification No.
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