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RX Audite SDR Switch manual

This controller was designed for antenna sharing to the TRX and CW/RTTY/FT8 skimmer. You can use it also for pan adapter, web SDR etc. There are protections and RF limiters at both RX outputs. RX antenna (INBAND) could be used while TRX is transmitting.

This manual page is for two versions of the rx audite switch. In this useful device you can find lots of powerful parts.

ONE black box with these incredible parts:

  • TRX/RX switch controlled by PTT signal
  • PTT splitter (IN/OUT) in sniffer mode (IN directly to OUT) or output PTT FET switch
  • 2-way rx splitter with low loss
  • 2x RF limiter rx protections which is the best on the market :)
  • RX switch for INBAND RX antenna only for SDR output
  • Both antennas with HPF > 100 kHz
  • RX preamplifier (high IP3, 18 dB gain) with variable ATT - version with optional preamp module
  • RX lines with High Voltage protections > 60 V AC
  • RX lines with SuperFuse current protections > 100 mA
  • Very high isolation TX to SDR, between RX ports, INBAND RX and TX/RX ANT port



rx audite sdr switch by qro.cz hamparts.shop



rx audite sdr switch by qro.cz hamparts.shop



Jump to

Front panel description
Rear panel description
Comparison
Optional preamp module
Examples of the block diagrams
Jumper settings


Front panel description

There are three switches with LED indication and red PTT LED

rx audite sdr switch description front panel qro.cz hamparts.shop

1. Power ON/OFF switch

- Even the Power Switch is OFF, you are able to switch ON the internal Preamp (Controller must be powered by the DC voltage)
- Signal from the main TX/RX ANT goes to the SDR RX output port. There are protections and RF limiter

2. PTT LED indication

- PTT indication

3. RX preamp module (option)

- PREAMP ON/OFF
- Switch for internal Preamplifier (optional or model with preamp)

4. Second RX ANT switch - SDR RX to

- INB RX ANT: SDR OUT is connected to INB ANT input all the time (TRX RX of TX)
- TX = INB RX ANT: SDR OUT is connected to INB ANT input or dummy load while TRX is transmitting


Rear panel description

There are RF connectors: SO-239 and SMA, DC jack and RCA PTT IN and OUT

rx audite sdr switch splitter rear panel description qro.cz hamparts.shop

1. Protected second RX output

- RX output for second RX, SDR, skimmer etc.
- including protections and limiter

2. Optional RX ANT (INBAND) input

- Input for RX antenna for SDR output
- Could be used while TRX is transmitting or all the time

3. Main TX/RX ANT

- Main TX and RX antenna
- TX for TRX
- Shared for TRX and SDR output
- When the controller is OFF - this antenna is connected to SDR out

4. TRX

- TRX port
- RX protections included

5. PTT RCA - IN and OUT

- PTT IN from TRX (station controller)
- IMPORTANT for the right function
- PTT out for PA or another device
- NO delay between PTT IN and OUT

6. Power supply input DC

- DC input
- DC 13.8 V recommended

7. GND screw

- connection for common ground in hamshack

 PLEASE, do not forget to connect PTT from your TRX. This controller does not have V0X, you have to connect TX information from your TRX. PTT OUT has got no delay. There is internal PTT splitter and you can connect another device there (PA).


Comparison

There are two versions, the first is without internal RX preamplifier and second one with it. This preamplifier could be added later too. This is wide band high IP3 preamplifier module. This RX preamplifier could help with insertion loss (protections, splitter etc.). You can set gain as you need. It is preset to 10 dB, what is IL +6 dB of the additional gain.

rx audite comparison of the two version by qro.cz hamparts.shop


Optional preamp module

Internal preamp could be used to eliminate controller insertion loss. Thanks to variable ATT you can comfortable gain value as you need. This optional preamp module could be installed also later as an option.

rx audite optional preamplifier module by qro.cz hamparts.shop



rx optional preamplifier module jumper settings by qro.cz hamparts.shop

1. Current check point

- disconnect jumper JP1
- connect mA meter there (200 mA scale is fine)
- connect supply voltage to the controller (13.8V)
- switch preamp ON by front panel switch

2. Bias Current set

- turn the resistor trimmer BIAS and set bias current - it should be around 40 mA
- then connect jumper JP1 back

3. Variable ATT

- with the resistor trimmer ATT you can set amplifier gain as you need from 0 to about 18 dB
- turn the ATT (R_ATT1 201) - multi turn trimmer


Examples of the block diagrams for all functions

There is simply blog diagram of the controller. RX lines have got high voltage and current protection, High Pass Filter (100 kHz), 2-way RX splitter and optional RX preamplifier. You can see functions at the pictures below.

Block diagram 

rx audite sdr switch block diagram by qro.cz hamparts.shop

Controller is switched OFF

Even the Power Switch is OFF, you are able to switch ON the internal Preamp - controller must be powered by the DC voltage
Signal from the main TX/RX ANT goes to the SDR RX output port. There are protection and RF limiter

rx audite block diagram by qro.cz hamparts.shop

Controller is switched ON

Signal from the main TX/RX ANT goes to the TRX and SDR RX output port via the 2-way splitter
There are protections and RF limiters for both outputs
You can use Preamplifier if it is built inside - if you have not the version with preamplifier, you can order the optional preamp module.

rx audite sdr block diagram by qro.cz hamparts.shop

Controller is switched ON: TRX is transmitting

TRX is transmitting to the main TX/RX ANT and SDR RX output port is connected to the internal dummy load or to the INBAND RX ANT port
There are protections and RF limiter

k9ay/4-way antenna switch controller block diagram remote version qro.cz hamparts.shop

Controller is switched ON: SDR RX out switched to INBAND RX ANT by the front panel switch

In this case main TX/RX ANT goes to the TRX port via the protections and limiter and you can use also preamplifier
SDR RX output port is connected to INBAND RX ANT input
There are protections and RF limiter

rx audite sdr switch block diagram by qro.cz hamparts.shop


Jumper settings

rx audite jumper settings by qro.cz hamparts.shop

1. INBAND or DUMMY LOAD

SDR output could be connected to Inband RX antenna or internal 50 Ohm dummy load. When you do not use Inband RX antenna, please set this jumper to internal dummy load or connect external small dummy load to Inband SMA connector.

2. OPTIONAL PREAMP

- Remove this jumper when the optional preamp is installed
- Must be shorted while there is no preamp module

3. PTT OUT

- Selecting between sniffer mode and PTT FET
- Please, see next picture with an explanation

4. PREAM ON/OFF

This jumper allows you to switch preamp only while the controller box is ON (main power switch is ON) or you can switch preamp independently on main power ON switch and use preamp also while the controller is OFF (this is in case you want to have preamp for SDR all time ON).



rx audite ptt logic by qro.cz hamparts.shop



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