Ten-Tec RX-340 - Page 91

SPECIFICATION TEST SETUP TYP. MIN/MAX
IF REJECTION
(90 dB typ.
80 dB min.)
FIRST IF:
Receive frequency 29.995 MHz, preamp OFF
USB Mode
IF BW 3.2kHz
BFO -1800 Hz
MAGC = 0
Apply 45.456 MHz, -50 dBm
Increase level for 10 dB SINAD.
>10 dBm -32 dBm MIN
SECOND IF:
Receive frequency 0.500 MHz.
Apply 456 kHz -50 dBm
Increase level for 10 dB SINAD. >10 dBm -32 dBm MIN
3
RD
ORDER
INTERCEPT
POINT
(+ 30 dBm typ.
+25 dBm min.)
Configure the Two-Tone test set to produce a low pass-
filtered 16.208 MHz/ 16.308 MHz two-tone output with
each tone at 0 dBm (6 dBm PEP).
Third order products and harmonics at the combiner
output must be less than -80 dBm. Connect the two-tone
output through a 1 dB step attenuator to the receiver RF
input. Receive frequency 16.1072 MHz, preamp OFF Set
MAGC to 65 dB
Note audio output level in dBv. Reduce the two-tone
level by 3 dB and observe a 9 dB drop in audio output.
Remove the two-tone generator and step attenuator.
Connect a 16.1082-MHz generator to RF input. Adjust
generator level for the same audio level noted above.
Generator level should be: -60 dBm -50 dBm MAX
Second Order
Intercept Point
(+75 dBm typ.
+60 dBm mm.)
Receive frequency 26.005 MHz, preamp OFF.
MAGC = 0.
Set generator to 22.728 MHz.
Connect sufficient lowpass filtering to generator output to
reduce 2nd harmonic to -100 dBc at -30 dBm output.
Connect filtered generator to RF input.
Adjust generator level for 10 dB SINAD.
Generator level should be: -17 dBm -26 dBm MIN
6-3