MFJ-962E Instruction Manual
8
WARNING:
1. Never operate the tuner with the top removed. Contact with the components
inside the tuner while transmitting will result in painful RF burns.
2. Never rotate the ANTENNA SELECTOR switch while transmitting. Doing so
may permanently damage the relays.
3. Locate the tuner so that the rear terminals ARE NOT accessible during
operation. The single wire and balanced line connections may have high
voltage while being used.
4. Disconnect all antennas from the tuner during lightning storms.
5. Always tune with low power (i.e. less than 100 watts). Apply maximum power
only after tuning up.
6. Be sure to adjust the SWR before transmitting at high power (above 100
watts). Do Not transmit with a high SWR for extended periods of time.
In Case Of Difficulty
If the tuner fails to tune, please double check all connections and follow the tuning procedures
again. Be sure you are using enough inductance (high enough inductance number) and have the
capacitors open far enough (higher front panel numbers).
If the tuner arcs at the rated power levels, please double check all connections and follow the
tuning procedures again. The power rating of this tuner is 900 watts PEP RF power. Be sure you
are using the least amount of inductance (lowest number) and the greatest capacitance (lowest
number) possible that still allows matching the load on the operating frequency.
Note: If this tuner arcs when operating on the 160 meter band, it may be necessary to reduce
transmitter output power.
If you are still unsuccessful, but the tuner does adjust and operate when switched to a dummy
load or another antenna, please read the Antenna System Hints section.
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 good 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 single wire feedline. If a good RF
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