User manual ALINCO DX-SR8

[. . . ] ALL MODE HF TRANSCEIVER DX-SR8 Instruction Manual ALINCO, INC. Head Office: Yodoyabashi-Dai Building 13th Floor 4-9, 4-Chome, Koraibashi, Chuo-ku, Osaka 541-0043, Japan Phone: +81-6-7636-2362 Fax: +81-6-6208-3802 http://www. alinco. com/ E-mail: export@alinco. co. jp Thank you for purchasing your new ALINCO transceiver. This instruction manual (and addendum sheets) contains important safety and operating instructions. Please read this manual carefully before using the product and keep it for future reference. Printed in Japan Copyright Alinco, Inc. PS0610 FNNM-EN NOTICE / Compliance Information Statement Conformity Information Alinco, Inc. [. . . ] Therefore, if the AGC-F mode is selected in the SSB mode, squelch may be muted and unmuted according to the signal strength. To prevent this, it is recommended to select the AGC-S mode rather than the AGC-F mode. 4. Tune in a station to communicate with. · Fine-tune to a frequency at which the signal from the station is clearly heard. NOTE: · Be sure to set the RIT knob back to the original position before contact is made. Otherwise, your frequency will shift off the other station's frequency. · Check to see the frequency is not used by other stations before transmitting. 35 Chapter 2 Communications 5. Press and hold the [PTT] key and speak into the microphone. The reading on the RF meter and brightness of the TX LED will change according to the intensity of your voice. NOTE: Speaking too close to the microphone or too loudly may increase distortion and reduce clarity. 6. Release the [PTT] key to receive. REFERENCE: Split-frequency operation, page 45. 2. 4 Practical Techniques for SSB Operation Introduction In SSB operation, you may encounter various problems such as poor propagations and interferences. This section explains how to use the special functions to overcome these problems. Eliminating Interference (QRM) 1: Activating the IF SHIFT function This function eliminates interference by shifting the filter pass band without changing the receive frequency. Turn the IF knob clockwise or counterclockwise to lessen interference. 2: Using the filter Press the [FUNC] key, then press the [RF] key. "Nar" appears on the display indicating that the narrow filter is selected. 3: Activating the RF attenuator When the received signal is noisy, it is possible that you are picking up another strong signal from nearby. Press the [RF] key to activate the attenuator to a desired level. 36 Chapter 2 Communications Communicating in Bad Conditions In HF band, propagations depend on time, season, and propagation paths. For example, signals from the other station may fade or alternate between strong and weak. 1: Using the RF preamplifier Press the [RF] key repeatedly until [+10] appears. 2: Selecting the AGC-F mode In the SSB mode, the AGC-S mode is usually selected. However, if there are strong signals or noise near a weak signal, the signal is suppressed by the strong signals or noise. In this case, select the AGC-F mode to improve recieving conditions. Press the [FUNC] key, then press the [MHz] key the "AGC-F" appears on the display. Communicating with Off-frequency Stations When communicating with a station that drifts his transmitting signal (QRH), use RIT so that you can fine-tune to his transmitting frequency without shifting your transmission signal. Activating the RIT function Press the [RIT] key and rotate the RIT control knob to fine-tune to the receiving frequency. · The RIT operation does not change your transmit frequency so that the other station does not need to shift the receive/transmit frequency. Communicating in Pile-ups Speech compressor increases the average power of the transmitted signal by amplifying the weak part of your speech. It helps communicating in poorer propagation conditions or in pile-ups. NOTE: Pile-up - the condition where many stations call one station at the same time. Using the speech compressor Set the speech compressor to "ON" in the Set mode (see page 81). NOTE: Speech-compressed signal may sounds distorted or unnatural in better communication conditions. 37 Chapter 2 Communications 2. 5 AM Operation Procedure NOTE: Make sure that all antenna, power, and microphone connections are correct. 1. Select the desired operating band (see page 27). [. . . ] Transmission is inhibited ([PTT] key is 5. Select correct frequency in an amateur 6. Power supply is insufficient in capacity. Use a regulated 13. 8 V DC power supply with a capacity of 30 Amps continuous duty. [. . . ]