LNR KD1JV, Manual, Page: 7 / 11

The DFE mode is used to enter the voltage via the paddle.

After the <TUNE UP> switch is pressed the side tone will annunciate “E B V” (enter battery voltage)

The current set point voltage will be annunciated by the side tone. This can be used to check the setting
if you forgot what it was. You can exit at this point, leaving the current value intact by tapping the
Fn
Button.

Enter four digits using the paddle, as in DFE mode. The voltage is entered as XX.XX volts.

When the fourth digit is entered, the value entered will be repeated, then go back to the switch scan.
Restoring default values:
If you wish to restore the original default power on frequencies, this can be done by holding the <
Fn > switch
closed while power is applied to the rig. These values can then be stored into memory with the above procedure.
Calibration values are not affected. Calibration values can be restored using the calibration mode, which will
also reset the initial power on frequencies.
Paddle wiring:
Standard paddle jack wiring is used: Dot = tip, Dash = ring.
Straight key mode:
Straight key mode is automatically detected and enabled when the rig is powered up when a monaural plug is in the
paddle jack. The sleeve of the mono plug grounds the dash input, which enables straight key mode. Straight key
mode also allows use of an external keyer if one so desires.
Operating voltages:
The MTR has been optimized for operation at 9 volts, with a minimum operating voltage of 6 volts and a maximum of
12.0 volts. Since power output is dependent on supply voltage, power output will vary from a low of about 900 mw
at 6 V and up to about 5 watts at 12 volts. NOTE: Since there is no fuse or current limiting in the rig, using a
1A in-line fuse in the power supply cord is highly recommended, especially if using a supply capable of large
short circuit currents.
Battery considerations:
Due to the MTR's modest current requirements, even when transmitting, a wide range of battery power options are
available to choose from.

A single 9V “transistor radio” battery will supply several hours of operating time and is often used for
“Sprint” type contests when station weight is a factor in the scoring.

A battery pack made up of “AAA” or “AA” batteries will supply many hours of operating time. Choose from
using as little as 4 cells for 6V QRPp operation or 8 cells for full power of close to 5W output.

Li-Ion stacks are also commonly used. Three cell stacks used for model airplanes are popular. Be sure to
use the approved charger for these! Also, since a fully charged stack can exceed the recommended maximum
supply voltage of 12V, a step down regulator is recommended or be very careful to insure a low SWR load.

Gel-Cells aren't as popular as they once were due to their large size and weight. These can also exceed
the recommended max supply voltage when fully charged, so again use a voltage dropping scheme (a couple
of silicon rectifier diodes wired in series does the trick) or insure a low SWR load.

Small, very inexpensive switching boost or buck regulator modules are available direct from China and
sold via Ebay. Using one of these can increase your battery selection choices and many of these modules
allow you to adjust the output voltage. Keep in mind that a boost regulator allows using fewer battery
cells, but increases the current they need to supply therefore decreasing their useful life. A buck
regulator requires more battery cells, but decreases the amount of current they need to supply therefore
increasing their useful life.
HIGH SWR CAUTION:
If operating the MTR with supply voltages greater than 9 volts, please ensure there is a low SWR load connected
to the rig. High SWR conditions (especially those which are reactive) when operating above 3 watts output may
cause the PA stage to become unstable or cause the PA FETS to be damaged. Be very careful when using a fully
charged gell cell to power the rig!
It is highly recommended that a resistive SWR bridge be used if an antenna tuner is needed to match the antenna.
Spare DC power plug : Mouser part number 171-3219-EX 1.7mm x 4.0 mm