You will need an external antenna tuner with the IC-7000.?
Running 100 watts into a 2:1 SWR (red bars on the internal SWR meter) can destroy the final transistors.??The IC-7000 will limit output power.?
Running 20 watts or less into greater than 2:1 SWR may be possible without damage,? but is not recommended.?
See pages 15 and 92 of the IC-7000 User Manual:
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For end fed long wires, a 4:1 balun is recommended (but not essential) to lower the antenna impedance and make it easier for the antenna tuner to match.????
Avoid exact half-wavelength or multiples, because the impedance will be too high for the tuner to match.??
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The inexpensive D7DDC design ATU-100 100 watt autuners advertized on Ebay and Amazon work great. The firmware imitates ther behavior of the Icom and LDG auto tuners.?
$73 fully assembled: ??
$30 kit with no enclosure: ??
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These can be modified to connect to the 4 pin Icom TUNER port, so you can operate from your transceiver TUNER button:?
?Solder a 560 ohm resistor to via "A6" on tuner.? Connect to Icom TUNER pin 1 (_KEY).?
?Solder a 560 ohm resistor to "B" header on tuner.? Connect to Icom TUNER pin 2 (_START).?
?Connect "+" header pin on tuner to? Icom TUNER pin 3 (+12v).?
?Connect "-" header pin on tuner to? Icom TUNER pin 4 (GND).?
The current limiting resistors protect the tuner micro I/O pins from an accidental connection to +12 volts or ground.?
Recommend strapping 100pF capacitors to ground on these pins to keep out stray RF.?
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Wnen an Icom transceiver senses 2 volts or more on _KEY when _START goes low,?
the Icom transceiver automatically limits power to 10 watts while tuning (when _KEY is then driven low by the tuner).?
On other transceivers, the operator must manually limit power to 10 watts while tuning, to protect the tuner's relay contacts.?
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Description of the _START and _KEY signals on the Icom and LDG antenna tuners: ??
Description of the TUNER connector circuit on the IC-7000: ??
N7DDC ATU-100 Technical Description: ??
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N0YWB