comdtinst m2400.1f - US Coast Guard Response Boat-Medium
comdtinst m2400.1f - US Coast Guard Response Boat-Medium
comdtinst m2400.1f - US Coast Guard Response Boat-Medium
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1.E.5. Abbreviations. Abbreviations used in this publication.<br />
CW - Continuous Wave<br />
FM - Frequency Modulation<br />
MCW - Modulated Continuous Wave<br />
P - Primary Frequency(ies)<br />
RATT - Radio Teletype<br />
S - Secondary Frequency(ies)<br />
SSB - Single Sideband<br />
V - Voice<br />
NIB - Not-to-Interfere Basis<br />
ISB - Independent Sideband<br />
NBDP - Narrow-band direct printing, also called SITOR or radiotelex<br />
F. Local Arrangements. Nothing in this manual is intended to<br />
abrogate any local arrangements made by district commanders for<br />
establishing liaison circuits with other agencies needed to<br />
accomplish assigned missions. However, the details of such<br />
arrangements must be forwarded to the Commandant (G-TTM) for approval<br />
by the appropriate radio frequency assignment authority and inclusion<br />
in this manual.<br />
G. Vacant.<br />
H. Compatibility of Equipment.<br />
Tuning Capability. Certain single sideband radio equipments within<br />
the <strong>Coast</strong> <strong>Guard</strong> are limited to integral, 1 kilohertz tuning<br />
increments in the operating band (example: 2670, 2671, 2672 kHz as<br />
shown on the equipment tuning dial). These equipments cannot tune to<br />
other frequencies within the 1 kHz integrals (e.g., 2670.4 kHz).<br />
Accordingly, those <strong>Coast</strong> <strong>Guard</strong> SSB equipments that do not possess 100<br />
hertz incremental tuning capability, shall follow the interim<br />
procedures listed below when the carrier frequency does not fall on a<br />
whole kHz step (noting that the carrier frequency for H3E/J3E and F1B<br />
emissions are normally located 1.4 kHz and 2.0 kHz respectively below<br />
the assigned frequency unless otherwise indicated:<br />
1. Emission. Subtract 1.4 kHz (2K8H3E/J3E emission) or 2.0 kHz<br />
(280HF1B/1K24F1B emission) from the assigned frequency.<br />
2. Remainder. Round out the remainder to the nearest whole kHz<br />
step (0.1 through 0.5 to the lower step, 0.6 through 0.9 to<br />
the higher step).<br />
3. Carrier or Dial Frequency. Place the carrier or dial<br />
frequency on the resulting whole kHz step and use upper<br />
sideband emission.<br />
4. NBDP Offset. Frequency offset for NBDP (SITOR) using<br />
exclusive maritime narrowband channels (500 Hz) should be<br />
1700 Hz to preclude the residual carrier energy falling within<br />
the pass band of the lower adjacent channel.<br />
1-3
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