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10.3.3 Product HW 8660/US
The product HW 8660/US is a radio base station operating in the 2400 – 2483.5 MHz band. It includes a
general purpose microcomputer which serves external interfaces such as Ethernet, RS-232 and Cen-
tronics.
The product is connected to the AC power lines through an external AC adaptor.
Radio frequency is used for transmission of digital information between the product and other devices
supporting the same radio standard. The radio frequency transmission and reception is provided by an
encapsulated transceiver module HW 86020.
The product either contains one or two of these modules depending on the required number of simulta-
neous radio connections.
The antennas are permanently attached to the transceiver modules inside the housing of the product.
There is no provision for connecting external antennas or amplifiers.
10.4 Radio frequency transmission
The entire radio function is encapsulated in a module of type HW 86020, in the following referred to as
transceiver. It comprises RF as well as baseband signal processing.
10.4.1 Frequency channels
The transceiver uses the frequency band 2400 – 2483.5 MHz. Within this band it operates on 48 fre-
quency channels. Table 1 lists the center frequencies. The channel spacing equals 1.626353 MHz, the
channel bandwidth equals 1.6 MHz, i.e. the frequency channels are not overlapping.
Ch #
Frequency [MHz]
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
Table 1: Center frequencies of the used frequency channels
© Höft & Wessel AG
Subject to amendment, errors excepted
User manual
CH#
2403,749647
24
2405,376000
25
2407,002353
26
2408,628706
27
2410,255059
28
2411,881412
29
2413,507765
30
2415,134118
31
2416,760471
32
2418,386824
33
2420,013176
34
2421,639529
35
2423,265882
36
2424,892235
37
2426,518588
38
2428,144941
39
2429,771294
40
2431,397647
41
2433,024000
42
2434,650353
43
2436,276706
44
2437,903059
45
2439,529412
46
2441,155765
47
HW90195UserMan.doc
Frequency [MHz]
2442,782118
2444,408471
2446,034824
2447,661176
2449,287529
2450,913882
2452,540235
2454,166588
2455,792941
2457,419294
2459,045647
2460,672000
2462,298353
2463,924706
2465,551059
2467,177412
2468,803765
2470,430118
2472,056471
2473,682824
2475,309176
2476,935529
2478,561882
2480,188235
1.0
02.02.2001
Lin
page 58/70
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