Fiber-Span AC3101-BTR-4, Installation Manual And User'S Manual

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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.
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
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
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 C
6 system’s LO
1
is set to the Band 6 (787MHz) frequency. An A 2 system’s LO
1
is set to the Band 2
(715MHz) frequency.
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
1
……………….………. 65 – 83MHz
IF
2
…………….…………. 10.7MHz
Transmitter(s)…………… Synthesized, FM
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