User's Manual

12
17.0 Operation
The system operates automatically and requires no user adjustments. It
translates 2.4 GHz signals by 3.328 GHz to and from the 5.7- 5.8 GHz band. For
example, a 2.462 GHz signal will go out over the air at 5.790 GHz (See
Conversion Table below).
Conversion Table
802.11
Channel
2.4 GHz
Freq. (MHz)
5.8 GHz
Freq. (MHz)
1 2412 5740
2 2417 5745
3 2422 5750
4 2427 5755
5 2432 5760
6 2437 5765
7 2442 5770
8 2447 5775
9 2452 5780
10 2457 5785
11 2462 5790
12 2467 5795
13 2472 5800
The Converter ODU is only intended for use with 2.4 GHz devices that alternate
between transmit and receive on the same radio channel. These are referred to as
Time Division Multiplex (TDM) devices. A typical example is an 802.11 WLAN card
or Access Point. These modems “ping-pong” back and forth between transmit and
receive so quickly during normal operation that both the TX and RX LEDs will
appear to be lit simultaneously. You can approximate the duty cycle from the LEDs
by their brightness.
The Converter ODU will not work with radio modems or wireless bridges that are
band-split true full duplex devices. Presently the ODU is only certified with the YDI
Diamond WLAN card as a system.
The Converter provides for linear amplification for transmit output powers up to +24
dBm (250 mW). This is important for Direct Sequence Spread Spectrum (DSSS)
radios, especially 802.11 devices. If you drive the Converter in excess of 250mW
output power, the amplifier will start to go into compression. This will result in raising
the sidebands and thus create interference on adjacent radio channels.
NOTE: Remember that all signals passing between the WLAN card and Converter
ODU are at a frequency of 2.4 GHz. Cable calculation must be performed using 2.4
GHz attenuation values.