MFJ-1026 Instruction Manual
Deluxe Noise Canceling Signal Enhancer
6
T/R DELAY:
This control adjusts the recovery time of the internal bypass relay. Never set this control
for QSK CW operation, always make sure the relay stays closed (you shouldn't be able to hear it click)
during a string of dots.
PRE-AMP ON/OFF:
This switch serves
two
functions:
When both JMP1 and JMP2 are "off" or not active (Figure 2), the front panel preamplifier switch
selects either the internal whip antenna (PRE-AMP ON position) or the external AUXILIARY
ANTENNA (PRE-AMP OFF position).
When JMP1 is "on" or active (Figure 3), the internal whip is not used and maximum external
amplifier gain is selected. When only JMP2 is "on" or activated (Figure 4), external
AUXILIARY ANTENNA gain is moderate. In both of these cases, the PRE-AMP switch either
inserts (ON) or bypasses (OFF) the internal pre-amplifier (consisting of Q9 and Q10).
AUXILIARY ANTENNA GAIN:
This control adjusts signal levels from the AUXILIARY antenna
connector. This control is marked from 0 to 10, with 10 having the most gain.
FREQ HIGH/LOW:
This switch selects phase components for LOW frequencies (frequencies lower
than somewhere around 7-12 MHz) OUT, or HIGH frequencies (somewhere above the range of 7-12
MHz) IN. In the range of 7-12 MHz, either setting often works.
PHASE:
This control is marked from 0-10, and adjusts AUXILIARY signal phase delay over a wide
range. Phase is advanced as the control is rotated clockwise (higher numbers).
PHASE NORMAL/INVERT:
This switch selects either normal (IN) or invert (OUT), adding or
removing 180
°
of additional phase delay.
MAIN ANTENNA GAIN:
This control is marked from 0-10, gain increases as the control is advanced
to ten. This control adjusts signal levels from the MAIN ANTENNA connector.
Jumper Settings
The PRE-AMP switch will select either the internal WHIP (ON
position) or the AUXILIARY ANTENNA (OFF position) with
this setup.
Auxiliary Antenna
Maximum Sensitivity
Moderate Sensitivity
JMP1 Installed
Not
Installed
JMP2
Not Installed
Pins 2 and 3 are connected
JMP1 is a 2-pin header. (Factory default: shorting clip not installed)
JMP2 is a 3-pin header with the pin numbers labeled on the PC Board. (Factory default: pins 1 and 2 are connected.)
Internal Noise Antenna
JMP1 Not
Installed
JMP2
Pins 1 and 2 are connected
