Fiber-Span LLC AC-3101-BTR 사용자 설명서
12/17/01
700/800 Systems
Frequency Selection Rules
1. Frequency Spacing……………..…Keep all BTR/TR receive and transmit frequencies at least 300kHz away from
each other, >400kHz preferred. Both the transmitters and receivers should be
at least 400kHz away from other RF equipment.
at least 400kHz away from other RF equipment.
2. IM Products………….…………… 2 transmitter 3
rd
orders by at least 100kHz (200kHz preferred)
3 transmitter 3
rd
orders by at least 50kHz (100kHz preferred)
2 transmitter 5
th
orders by at least 50kHz (100kHz preferred)
3. Transmitter Sidebands……...…… Avoid base and beltpack carrier sidebands: +/-200kHz, +/-400 and +/-600.
Keep at least 50kHz away from these frequencies.
4. Bandwidths………………….……. Transmitter bandwidth = 150kHz
Receiver bandpass = 230kHz
5. Base RX 4MHz Image Harmonics. C6 frequencies to avoid are 704.4, 708.4, 712.4, 716.4, 720.4.
A2 frequencies to avoid are 632.4, 636.4, 640.4, 644.4, 648.4.
Avoid the frequencies, by at least 50kHz
6. Base LO
1
Xtal harmonics……...… Avoid C6 Xtal harmonics; 524.667, 655.833, 787.000 by at least 50kHz .
Avoid A2 Xtal harmonics; 476.667, 595.833, 715.000 by at least 50kHz.
FYI
TR-700/800 Oscillators/IFs – Dual Conversion Superheterodyne, Synthesized, FM
LO
TR-700/800 Oscillators/IFs – Dual Conversion Superheterodyne, Synthesized, FM
LO
1
…………...……….… Synthesized (If set on correct frequency then, LO
1
= RF
IN
– 65.7)
LO
2
……………………… 55MHz, Xtal, Fixed
Master Oscillator….…..… 4MHz, Xtal, trimmer adjust
IF
IF
1
……………….………. 65.7MHz
IF
2
…………………….…. 10.7MHz
Transmitter……………….Synthesized, FM
BTR-700/800 Oscillators/IFs - Dual Conversion Superheterodyne, Synthesized, FM
LO
1
……………………… X MHz, x6 Xtal Osc., Fixed
1 Band……….… X = 697MHZ
2 Band……….… X = 715MHz
3 Band……….… X = 733MHZ
4 Band……….… X = 751MHZ
5 Band……….… X = 769MHz
6 Band……….… X = 787MHZ
7 Band……….… X = 805MHZ
Examples: A C6 system’s LO
1
is set to the Band 6 (787MHz) frequency. An A2 system’s LO
1
is set to the Band 2
(715MHz) frequency.
LO
LO
2
……………...…….… Synthesized, 75.8 to 93.6MHz. (If set on correct frequency then, LO
2
= LO
1
- RF
IN
+ 10.7)
Master Oscillator...……… 4MHz, Xtal, trimmer adjust
IF
IF
1
……………….………. 65 – 83MHz
IF
2
…………….…………. 10.7MHz
Transmitter(s)…………… Synthesized, FM
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