MILITARY CRYSTAL SPECIFICATIONS -------------------------------- The information contained in these tables are derived from the 'D' revision of MIL SPEC MIL-C-3098, General Specification for Quartz Crystal Units. The table does not reference all sixty nine types of military quartz crystals, only the more common types which can be found in the surplus market place. Item Military Holder Frequency Oscillat- Freq Resonance Type Type Range ing Toler. Mode (%) ----------------------------------------------------------------- 1 CR-15B/U HC-5/U 80-200 Khz Fundamental +/-.01 Parallel 2 CR-16B/U HC-5/U 80-200 Khz Fundamental +/-.01 Series 3 CR-17/U HC-10/U 15-25 Mhz 3rd overtone +/-.005 Series 25-50 Mhz 5th overtone +/-.005 Series 4 CR-18A/U HC-6/U 0.8-20 Mhz Fundamental +/-.005 Parallel 5 CR-19A/U HC-6/U 0.8-20 Mhz Fundamental +/-.005 Series 6 CR-23/U HC-6/U 10-52 Mhz 3rd overtone +/-.005 Series 52-75 Mhz 5th overtone +/-.005 Series 7 CR-24/U HC-10/U 15-25 Mhz 3rd overtone +/-.005 Series 25-50 Mhz 5th overtone +/-.005 Series 8 CR-25A/U HC-6/U 200-500 Khz Fundamental +/-.01 Series 9 CR-26A/U HC-6/U 200-500 Khz Fundamental +/-.002 Series 10 CR-27A/U HC-6/U 0.8-20 Mhz Fundamental +/-.002 Parallel 11 CR-28A/U HC-6/U 0.8-20 Mhz Fundamental +/-.002 Series 12 CR-29A/U HC-5/U 80-200 Khz Fundamental +/-.002 Parallel 13 CR-30A/U HC-5/U 80-200 Khz Fundamental +/-.002 Series 14 CR-31A/U HC-6/U 1-10 Mhz Fundamental +/-.005 Parallel 15 CR-32A/U HC-6/U 10-52 Mhz 3rd overtone +/-.002 Series 52-75 Mhz 5th overtone +/-.002 Series 16 CR-33A/U HC-6/U 10-25 Mhz 3rd overtone +/-.005 Parallel 17 CR-35A/U HC-6/U 0.8-20 Mhz Fundamental +/-.002 Series 18 CR-36A/U HC-6/U 0.8-20 Mhz Fundamental +/-.002 Parallel 19 CR-37A/U HC-13/U 90-250 Khz Fundamental +/-.02 Parallel 20 CR-38A/U HC-13/U 16-100 Khz Fundamental +/-.012 Parallel 21 CR-42A/U HC-13/U 90-250 Khz Fundamental +/-.003 Parallel 22 CR-43/U HC-16/U 80-860 Khz Fundamental +/-.01 Parallel 23 CR-44/U HC-6/U 15-20 Mhz 3rd overtone +/-.002 Parallel 24 CR-45/U HC-6/U 455 Khz Fundamental +/-.02 Series 25 CR-46A/U HC-6/U 200-500 Khz Fundamental +/-.01 Parallel 26 CR-47A/U HC-6/U 200-500 Khz Fundamental +/-.002 Parallel 27 CR-48/U HC-6/U 800-3000 " Fundamental +/-.008 Parallel 28 CR-50/U HC-13/U 16-100 kHz Fundamental +/-.012 Series 29 CR-51A/U HC-6/U 10-61 Mhz 3rd overtone +/-.005 Series 30 CR-52A/U HC-6/U 10-61 Mhz 3rd overtone +/-.005 Series 31 CR-53A/U HC-6/U 50-87 Mhz 5th overtone +/-.005 Series 32 CR-54A/U HC-6/U 50-125 Mhz 5th overtone +/-.005 Series 33 CR-56/U HC-18/U 17-61 Mhz 5th overtone +/-.005 Series 34 CR-56A/U HC-18/U 50-125 Mhz 5th overtone +/-.005 Series Table 1 - OPERATING CHARACTERISTICS OF POPULAR MILITARY CRYSTALS Holder Pin Pin Holder Holder Holder Type Diam. Spacing Height Thickness Width --------------------------------------------------------- HC-5/U 0.156 0.812 2.205 1.817 1.594 HC-6/U 0.050 0.486 0.775 0.317 0.725 HC-10/U 0.062 n/a 1.055 0.560 n/a HC-13/U 0.050 0.486 0.775 0.317 0.725 HC-18/U 0.017 0.192 0.530 0.150 0.402 Table 2 - DIMENSIONS OF POPULAR MILITARY CRYSTAL HOLDERS This is a transcript of an article by Maurice Shumaker, W0HYB which appeared in the June 1967 edition of 73 Amateur Radio Magazine. Transcribed by: Jerry Proc, VE3FAB April 7, 1995