RX preamp BOX with 2N5109 OK2ZAW
This is very simply preamplifier BOX module with 2N5109 transistor based on W7IUV design. You can use it as high IP preamplifier for RX antennas (beverage, DHDL, flag etc).
Gain is up to 18dB and there is also build in variable ATT. You can easy set the gain as high as you need! As well you can set right transistor bias with multi turn potentiometer.
Two relays offer bypass switching if there is no power supply voltage. You can use external power supply connected to the box or the bias tee box for power over the coax.
Broadband: 0.1 MHz to 30 MHz Very high IP3 Gain up to 18 dB High output power up to 26 dBm Variable ATTfor gain 0 to 18dB Bypass relays Front-end diode protections. On/Off by Jumpers Power over coax with the Bias Tee BOX - LINK
- You can set transistor bias as you need by trimmer
- High quality relays with TWO contact parallel
- Connectors SO239 or F
- BOX size 100x100 mm
- Supply voltage 12 - 15 V
- Power directly or over the coax - bias tee - voltage 12 - 15 V
- Supply current up to 180 mA includes relays!
- Gain: up to 18 dB
- REAL IP3 37 dBm for 18 V / 90 mA more here
High IP RX preamplifier - RX antennas Buffer amplifier Driver amplifier
RX preamp box ASSEMBLED and tested PACK of RX preamp box and Bias Tee box ASSEMBLED and tested KIT of RX preamp box: PCB + box + rest parts with transistor and radiator PCB only
The measured values
Gain 50 kHz to 1 MHz
Gain 1 MHz to 70 MHz
Input SWR, S11
Example with Bias-tee DC BOX and RX preamp BOX:
|RX preamp BOX module with 2N5109|
|Schematic and board pic||sch||brd|
We believe open source is a better way of doing things.
View and download the Shield Schematic and PCB files.
The hardware designs are released under the
Attribution-NonCommercial 2.0 Generic