Section IV COSITE PLAN

BRIGADE MASTER NET LIST CONT. - TM-11-5895-1412-12P_226

TM-11-5895-1412-12P Basic Generation Unit AN/GYK-33 (NSN 5895-01-260-4545) (EIC:N/A) Manual
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TM 11-5895-1412-12&P Section IV COSITE PLAN A cosite plan provides frequency separation from 0.5 to 5 MHz between nets. A cosite plan is used when operating more than one net within a communications van or close proximity to other nets or when mutual frequency interference may result between radios. A cosite plan allows these nets to communicate simultaneously without mutual interference. A cosite plan provides separation for up to 50 cosite groups. Each gruop can contain up to 12 nets (1 base net and 11 others). One-frequency value separation is selected for all 50 cosite groups. The following items should be considered before constructing a cosite 1. Determine whether enough frequencies are available for uti cosite plan. 2. Determine whether cositing 3. Determine whether the nets are also in a reuse plan. of plan: lizing a provides adequate frequency separation. being considered for the cosite plan 4. Determine whether the cosite problem can be resolved by other means such as terrain masking, antenna remoting or use of low power. If FM transmitters operating on different frequencies are situated in the same locale, it is not unusual for mutual interference problems to result. To effectively reduce these interference problems, the BECS software adheres to the following basic assignment standards: 1. Frequencies with an exact separation factor of 5.75 or 23.00 MHz to cosited nets. 2 Cosited nets are not assigned frequencies which are on the order of the second harmonic. For example, the frequency setting of 30.00, 32.65 and 35.00 will possibly interfere with a radio using 60.00, 65.30 and 70.00 MHz respectively. To construct a cosite group, execute the following steps: 1. Identify the nets to be entered in the cosite group (12 max). 2. Identify the first base net and list the other nets. 3. Identify the second base net and list the other nets. 4. Continue the process until you reach one base net and one remaining net. The cosite nets are entered into a triangular table as shown in Table G-3. G-29

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