MFJ-945D Instruction Manual
6
WARNING: Never transmit while changing the INDUCTOR SELECTOR.
6.
Increase the transmitter power until the Forward power level is full scale (30 watts) and
observe the reflected power or SWR. If the reflected power and SWR are not satisfactory,
adjust the MATCHING controls again.
NOTE:
If your transmitter will not put out 30 watts, set it to the maximum power available.
7.
After a low SWR is obtained, the transmitter power may be increased to any value up to 300
watts carrier, or 300 watts PEP (175 watts on 160 meters).
The MFJ-945D will reduce the SWR of most antenna systems to 1:1. In some cases, a perfect
1:1 SWR may not be obtainable. If this is the case, the length of the antenna or the feedline can
be changed slightly until a low SWR can be obtained. See the antenna hints section.
In Case Of Difficulty
If this tuner
fails to tune,
please double check all connections and follow the tuning procedures
again. Be sure you are using enough inductance (highest letter usable for band) and have the
capacitors open far enough (highest front panel number).
The power rating of this tuner is 300 watts on 80 meters and above, and 175 watts on 160
meters. If this tuner
arcs
at the rated power levels, please double check all connections and
follow the tuning procedures again. Be sure you are using the highest inductance letter and the
lowest capacitance number possible to match the load on the operating frequency.
If you are still unsuccessful, but the tuner does adjust and operate when connected to a dummy
load or another antenna, please read the following ANTENNA HINTS text.
Grounding Hints
To minimize RFI, single wire feedlines (such as used with Windom or longwire antennas)
should be kept away from other wiring. Radiation will be minimized if the single wire feeder
runs parallel and reasonably close to the wire that connects the tuner to the outdoor ground.
The antenna feed wire should be adequately insulated to prevent arcing or accidental contact.
For safety, please use both dc and RF grounds. It is particularly important to have a good RF
ground while using a single wire feeder. When using a single wire feeder, the tuner needs
something to "push" against in order to force current into the line. If a good RF ground is not
available, RF will usually find it's way back into the power line (RFI), transmitter audio circuits
(RF feedback), or the operator (RF burns).
(40 Seiten)
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