Daniels VT-3/140-SWA2, Инструкция по эксплуатации

Страница: 176 / 262

2-8 Enhanced AM/FM Synthesizer Instruction Manual OS(R/T)-3(A/H) 29 - 470 MHz
2.6 5.0/6.25 kHz Channelization.
All Daniels VHF synthesizers (excluding AM synthesizers) have been designed to generate
frequencies in both 5.0 kHz and 6.25 kHz channel increments. BCD channel switch settings from
0000 to 4999 will therefore select operating frequencies with 5.0 kHz increments, while BCD
switch settings from 5000 to 9999 will select operating frequencies with 6.25 kHz increments.
Calculation of the operating frequency for VHF synthesizers capable of 5.0/6.25 kHz
channelization is determined as follows:
•BCD switch settings from 0000 to 4999: Multiply the switch setting by 5.0 kHz and add
the result to the synthesizer base frequency.
Example: An OST-3H141 synthesizer has a base frequency of 128 MHz. The
selected channel number is 0988. The synthesizer output frequency is:
((988 x 5 kHz) + 128 MHz) = 132.940 MHz
•BCD switch settings from 5000 to 9999: Subtract 5000 from the switch setting. Multiply
the result by 6.25 kHz and add the result to the synthesizer base frequency.
Example: An OSR-3H162 synthesizer has a base frequency of 150 MHz. The
selected channel number is 7205. The synthesizer output frequency is:
((7205-5000) x 6.25 kHz) + 150 MHz) = 163.78125 MHz
2.7 8.333 kHz Channelization.
Daniels AM synthesizers have been designed to generate frequencies in 8.333 kHz increments. In
North America, AM channels and operating frequencies are allocated in triples of 8.333 kHz
(i.e. 25 kHz steps). The operating frequency for synthesizers having 8.333 kHz channelization is
determined as follows:
•Multiply the BCD switch setting by 8.333 kHz and add the result to the synthesizer base
frequency.
Example: An OST-3A128 synthesizer has a base frequency of 118 MHz. The
selected channel number is 0231. The synthesizer output frequency is:
[(1200 x 8.333 kHz) + 118 MHz] = 128.000 MHz