CT Spectrum Management Association
Connecticut's Amateur Radio Operator's frequency coordination group

Select the Mastr II Combination number that matches your unit.  Type in the frequency you wish to use for transmit or receive in the appropriate field, then click outside the box.  The xtal frequency will appear!  If you have a xtal and want to see the frequency where it can be used, enter the xtal frequency in the appropriate field, then click outside the box.  This calculator is for experimental purposes only at the risk of the user.  Get General Electric Mastr II Icom details at Hall Electronics.

More information on Mastr II Units is needed!

Send your comments, corrections, and additions to: W1AN.

                               
General Electric Mastr II ICOM Oscillator Frequency Calculation
Transmitter
Model Combination No.
Freq Range Digits
Freq Band Formula Crystal Range (MHz) Calculator
Tx Freq Fo       Xtal Freq Fx
12 25-30 Fo /3 8.33-10
13 29.7-36 Fo /3 9.9-12
23 36-42 Fo /3 12-14
33 42-50 Fo /3 14-16.67
33 Extended 50-54 Fo /3 16.66-18.00
44,45 66-88 Fo /6 11-14.67
56 138-155 Fo /12 11.5-12.92
66 Extended 144-148 Fo /12 12.00-12.33
66 150.8-174 Fo /12 12.56-14.5
56, 66 Modified 222-225 Fo /18 12.33-12.5
77 406-420 Fo /36 11.27-11.66
78 420-450 Fo /36 11.66-12.55
88 Extended 440-450 Fo /36 12.22-12.55
88 450-470 Fo /36 12.5-13.05
89 470-494 Fo /36 13.05-13.72
91 494-512 Fo /36 13.72-14.222
General Electric Mastr II ICOM Oscillator Frequency Calculation
Receiver
Model Combination No.
Freq Range Digits
Freq Band Formula Crystal Range (MHz) Calculator
Rx Freq Fo       Xtal Freq Fx
12 25-30 (Fo+11.2) /3 12.06-13.73
13 29.7-36 (Fo+9.4) /3 13.03-15.13
23 36-42 (Fo+11.2) /3 15.73-17.73
33 42-50 (Fo+9.4) /3 17.13-19.8
33 Extended 50-54 (Fo+9.4) /3 19.8-21.13
44, 45 66-88 (Fo-11.2) /6 12.86-16.54
56 138-155 (Fo-11.2) /9 14.08-15.98
66 Extended Low Inj 144-148 (Fo-11.2) /9 14.75-15.2
66 Low Inj 150.8-174 (Fo-11.2) /9 15.51-18.08
66 High Inj 138-174 (Fo+11.2) /9 16.57-20.57
56, 66 Modified Low Inj 222-225 (Fo-11.2) /12 17.56-17.82
77 406-420 (Fo-11.2) /27 14.62-15.14
77 Extended 420-430 (Fo-11.2) /27 15.14-15.51
78 420-450 (Fo-11.2) /27 15.14-16.25
88 Extended 440-450 (Fo-11.2) /27 15.88-16.25
88 450-470 (Fo-11.2) /27 16.25-16.99
89 470-494 (Fo-11.2) /27 16.99-17.88
91 494-512 (Fo-11.2) /27 17.88-18.54
  450-512 (Fo+11.2) /27 17.08-19.38
92 806-820 (Fo-45) /48 15.85-16.25