Minima QRP the BiDirection IF Amplifier
This is no build
and tested.
RX
R24 0,4mA,
R26 8,17V 2k2 -> 3,7 mA
R27 7,47 V 220 ohm -> 34 mA
Total current R22
0,39V 10 ohm -> 39 mA.
Put in 10,4 mV 20
MHz from generator 50 ohm to C34.
Get 40,8 mV out @
C38 this means 11,9 dB ?, but in Z is not 50 ohm.
More then -25 dBm
in @ C34 is clipping in T11
TX
R13 1,28V 220 ohm -> 0,6mA
R17 8,8V 2k2 -> 4 mA
R18 8,13V 220 ohm
-> 37 mA
Total current R10
0,48 V 10 ohm 48mA.
Put in
32 mV 20 MHz from generator 50 ohm to C29.
Get 56
mV out @ C33 this means 4,9 dB ?, but in Z is not 50 ohm.
50 mV
1kHz to MIC in measure @ C33 with 50 ohm power meter -23 dBm.
100 mV
1kHz to MIC in measure @ C33 with 50 ohm power meter -16 dBm.
172 mV
1kHz to MIC in measure @ C33 with 50 ohm power meter -10 dBm.
It
start clipping at higher inputs!
After
this i test Rx put generator to C34 -107 dBm. 20,001 MHz.
Give me a audio around 12 dB SINAD, i can clear
hear a toggle on/off generator @ -120 dBm.
For me it seems
that this part is working, better then expected.
Next
time i start with the X-tal filter lock forward to test the 30 X-tal i have in
my box.
