Ten-Tec RX-340 Technical Manual page 91

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