Alinco DX-801 Manuel d'instructions télécharger pdf (Page 9)

MFJ-925 Super-Compact IntelliTuner Automatic Antenna Tuner Instruction Manual

Fast Start

WARNING

● Never operate the tuner with its cover removed. Contact with the components inside the

tuner while transmitting will result in painful RF burns.

● Locate the tuner so that the rear terminals are not accessible during operation. The single

wire connection may have high voltage while transmitting.

● Disconnect all antennas from the tuner during lightning storms.

● Always tune with low power (2-20 watts). Apply maximum power only after tuning up.

● Never exceed tuner specifications.

1. Connect the MFJ-925 to a 12-15 VDC voltage source capable of supplying at least 750 milli-amps.

2. Connect your transmitter to the TRANSMITTER connector using a 50-ohm coaxial cable.

3. Connect your coax-fed antenna to the ANTENNA connector using a 50-ohm coaxial cable, or

connect your random wire to the ANTENNA connector through the supplied adaptor.

4. Connect your ground connection to the GROUND post.

5. Press the [POWER] button to turn on the MFJ-925 tuner.

6. Press the [ALT] button momentarily until there is one beep. One beep indicates that memory 1 is

selected.

7. Key your transmitter to output a carrier of 2-20 watts CW, FM or AM.

8. Press and hold the [TUNE] button for one second to start the automatic tuning process. When

completed, check to ensure an SWR of 1.5 or less has been achieved before increasing RF power.

Note: If you have a tuning solution on one band and you then change bands and attempt to

transmit a tuning signal, the previous tuning solution may be sufficiently severe such that

no power is detected by the MFJ-925 (the MFJ-925 will tell you to increase power).

When this occurs, simply bypass the MFJ-925 and then initiate a tune.

9. You are ready to transmit with full power.

Note: During the automatic tuning process, the tuner will make some noise. These are the

relays switching at a very high rate and this is normal. Do not be alarmed.

Note: When the tuner power is OFF, the tuner is in bypass mode and RF from the transmitter

goes directly to the antenna with no matching. The tuner also powers up in the bypass

mode. When the tuner power is ON, pressing [TUNE] quickly places the tuner in bypass

mode if desired, which is indicated by one beep.

Transmitter MFJ-925

50-ohm Coax

Antenna

RF Ground 12 VD

Figure 1. Typical Installation Block Diagram.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 39 40

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Alinco DX-801 Manuel d'instructions Page 9