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The format of the second line is explained in Appendix A. The display can be turned ON or OFF (see section 3.2.4). AVALON RF, INC. Page 11 of 28 DX404/DX504/DX604 User’s Guide & Operating Manual AVALON RF, INC. Page 11 of 28 DX404/DX504/DX604 User’s Guide & Operating Manual Front Panel Interface The DX604 has an optional IRDT serial interface, capable of communicating with a PDA at a distance up to 3 feet. 3.2 Operating the DX604. The commonly used receiver commands are: * Tuning * Frequency scanning * Tuner select (Excluding tuners from the diversity) * Turning the display on or off * Locking the keypad. 3.2.1 Tuning tunes in to the desired frequency. The <*> key is used as a decimal point. The DX404 NTSC model tuning range is from 56MHz to 802.25MHz The DX404 PAL model tuning range is from 56MHz to 860MHz. The DX504 tuning range is from 900 MHz to 928 MHz (2150 MHz with Option 4). The DX604 tuning range is from 2350 MHz to 2500 MHz (2150 to 2500 MHz with Option 4). E.G.: 802*25 tunes a DX404 to 802.25MHz (Channel 69) 912 tunes a DX504 to 912MHz. 2412 tunes a DX604 to 2.412GHz. The tuned-in frequency appears on the top left of the LCD as explained in Appendix A. If is out of the tuning range, the receiver will display “INVALID” and default to the last tuned-in frequency. E.G.: 912 is beyond the tuning range of the DX604 and will be rejected. AVALON RF, INC. Page 12 of 28 DX404/DX504/DX604 User’s Guide & Operating Manual AVALON RF, INC. Page 12 of 28 DX404/DX504/DX604 User’s Guide & Operating Manual 4 only). The valid channels for the DX404 NTSC model are 2-69. The valid channels for the DX404 PAL model are 2-12 and 21-70. E.G.: #25 tunes a DX404 to channel 25. 3.2.2 Frequency scanning. tunes to the next higher frequency (or Channel for DX404). tunes to the next lower frequency (or Channel for DX404). Holding down the or keys changes the frequency (or channel) repeatedly. The factory preset step increment/decrement step is 0.25MHz and may be changed by typing the following sequence: *92 Where is a 4 digit number from 0025 to 9975, corresponding to a minimum step of 0.25MHz and a maximum of 99.75MHz. E.G.: *92 1 will increment/decrement 1MHz at a time. *92 12 will increment/decrement 12MHz at a time. *92 0025 will increment/decrement 0.25MHz at a time. *92 1225 will increment/decrement 12.25MHz at a time. 3.2.3 Tuner Select The DX604 is factory preset to automatically select one of the 4 tuners (The one with the best signal). The number of tuners participating in the diversity process can be limited via the following function ( is any tuner number from 1 to 4): *1# selects one tuner only. *1# selects two tuners. *1# selects three tuners out of four. *1 selects all four tuners (normal mode) E.G.: *1#1 locks the output to tuner 1 and stops the diversity. AVALON RF, INC. Page 13 of 28 DX404/DX504/DX604 User’s Guide & Operating Manual AVALON RF, INC. Page 13 of 28 DX404/DX504/DX604 User’s Guide & Operating Manual A A/M indication is shown on the LCD display, line 2 as explained in Appendix A. This setting is not saved at power off. 3.2.4 Turning ON or OFF the display. *# toggles the display ON or OFF. 3.2.5 Locking the keypad. This feature is used to prevent accidental change of setup. *077 locks the keypad. *055 unlocks the keypad. The LCD displays a “L” at the bottom right if the keypad is locked. AVALON RF, INC. Page 14 of 28 DX404/DX504/DX604 User’s Guide & Operating Manual AVALON RF, INC. Page 14 of 28 DX404/DX504/DX604 User’s Guide & Operating Manual Setup. 3.3.1 Tuning the audio sub-carrier frequencies (DX504/DX604 only). The Audio1 sub-carrier frequency is factory preset to 6 MHz. The Audio2 sub-carrier frequency is factory preset to 6.5MHz. The audio sub-carrier frequencies can be tuned anywhere between 5MHz to 7MHz in increments of 10KHz. Audio1: *21# Audio2: *22# Where is from 500 to 700 (the first digit represents megahertz & the last digit represents 10’s of kilohertz), tunes the audio sub-carrier to the desired frequency. If the ‘#’ character and are omitted, the sub-carriers will tune to the factory preset. E.G.: *21# 665 tunes Audio1 to 6.65 MHz. *22# 700 tunes Audio2 to 7MHz *22 tunes Audio2 back to 6.5MHz 3.3.2 Setting the audio sub-carrier bandwidth. The audio IF bandwidth can be set to narrow for 75 KHz deviation or wide for 125 KHz deviation. Audio1: *211 sets Audio1 bandwidth to Narrow. *210 sets Audio1 bandwidth to Wide. Audio2: *221 sets Audio2 bandwidth to Narrow. *220 sets Audio2 bandwidth to Wide. Selecting an incorrect audio bandwidth results in a low and distorted audio output. AVALON RF, INC. Page 15 of 28 DX404/DX504/DX604 User’s Guide & Operating Manual ...

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