‰  NOW 30 WPM  ‰  TEXT IS FROM MAY 2018 QST  PAGE 36‰

LOSS OF THE 146 MHZ RF FILTER USED HERE IS APPROXIMATELY 5 DB.  THE DEVICE
CAN BE CALIBRATED BY FOLLOWING INSTRUCTIONS IN THE AD8307 LOG AMPLIFIER
DATASHEET.  WITHOUT CALIBRATION, THE AD8307 USUALLY REPORTS A LEVEL OF
ABOUT 3 DB HIGHER THAN THE ACTUAL LEVEL.  THIS CALIBRATION MAY NOT BE
IMPORTANT TO MOST USERS BECAUSE THE DEVICE IS USED ONLY FOR RELATIVE RF
SIGNAL STRENGTH MEASUREMENTS.  USING THE DEVICE FIGURE 4 SHOWS THE REMOTE
RF LEVEL ANNUNCIATOR ATTACHED TO A MIDLAND 13 520 2 METER HANDHELD
TRANSCEIVER SET TO 146R52 MHZ.  A DIPOLE RECEIVING ANTENNA TUNED TO 146 MHZ
IS ATTACHED TO THE SET.  THE TEST ANTENNA AND KENWOOD TH F6 TRANSCEIVER ARE
NOT SHOWN.  WHEN THE TH F6 FM HANDHELD TRANSCEIVER IS KEYED ON 146R52 MHZ
USING ITS ORIGINAL RUBBER DUCKIE ANTENNA HELD HORIZONTALLY TO MATCH THE
POLARIZATION OF THE DIPOLE RECEIVING ANTENNA AT SHOULDER HEIGHT ABOVE
GROUND, AND FROM A DISTANCE OF 30 METERS, THE DEVICE ANNOUNCES THE LEVELS
SHOWN IN TABLE 1.  WE WOULD EXPECT A 10 DBM DROP FOR THESE POWER LEVELS PER
10 DB REDUCTION IN TRANSMITTER POWER, BUT WE DO NOT KNOW WHAT THE OUTPUT
AMPLIFIER OF THE TH F6 IS DOING RELATIVE TO A POOR PERFORMING RUBBER DUCKIE
‰  END OF 30 WPM TEXT  ‰  QST DE W1AW  ƒ