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This RX Audit splitter/switch is very powerful device combines TRX switch, RX splitter, RF limiter protection for both RX outputs, INBAND RX antenna input and optional RX preamplifier. You can share your main TX/RX ANT to two receivers with RF power limiter protection.
There are several SDR switches on the market, most of which offer only basic (anti-parallel diodes) or no protection for RX outputs. This can result in the destruction of expensive SDR equipment during a storm or by your own TX signal from the TRX or another antenna at your QTH. This box was created as an RX splitter for the RBN network, and its functions were designed for this purpose. The main emphasis was placed on receiver protection and high isolation.
This is very powerful device that combines TRX switch, RX splitter, RF limiter protection for both RX outputs, INBAND RX antenna input and optional RX preamplifier. You can also share your main TX/RX ANT to two RX with RF power limiter protection.
This is ideal solution for Spectrum Panadapter, WebSDR or Skimmer Server - RBN.
When the controller is OFF then main TX/RX antenna goes to the SDR RX output - through RF limiter. You can turn on the preamplifier even when the RX Audite is left turned off (power switch in the OFF position). In this case, the signal from the main TX/RX antenna passes through the protection, preamplifier and RF limiter before reaching the SDR output. This increases the sensitivity of the SDR receiver. When the controller is ON, Main TX/RX antenna is shared between TRX and SDR outputs. During transmitting, the SDR RX output can be connected to the internal dummy load or to the INBAND RX antenna input. You can switch the SDR RX output to the INBAND RX ANT port not only while the TRX transmitting, but by the front panel switch, it can be switched all time. For example, if you want to operate SDR on a different band than TRX - a different antenna (band / direction) on the INB ANT input and a different one on Main TX/RX. The INBAND ANT port can be used to connect an external antenna for SDR RX. Options include a remote RX antenna in the case of a big (contest) QTH or an antenna on a different band (than the MAIN TX/RX ANT and TRX at that moment). HIGH IP3 internal preamplifier can be used for insertion loss compensation. Additional gain is variable, up to 14 dB.
These are the parameters and notes for the MK3 version with serial numbers 25006xxx and above.
Although the price of the device may seem high, it contains several protection systems that could save you much more in the long run. The main feature is the RF limiters, which protect both receivers’ outputs. If a strong signal appears at the receiver input, it can cause irreversible damage. These protections are especially important for SDR receivers with ADC converters connected to the antenna, as they limit the maximum signal size and thus protect the receivers. Even in the event of a PTT malfunction or incorrect transmission to the antenna input, these protections safely limit the RF signal strength and prevent damage to the receivers. For more information, including measurements, please refer to the Instructions Manual.
Older version with serial number < 2506xxx:
ASSEMBLED: preamp version - ready to use
ASSEMBLED: VHF 6/4m version - ready to use - VHF version
RX Audite switch with preamp assembled and tested
DC plug - image
Read the online review by Rick Swenton, WR1S - pdf version
Read the QST review by Pete Smith, N4ZR
If you want to know more please check our wiki with RX Audite Switch manual.
TIP: You can use RX AUDITE with one RX. Switching the SDR RX to INB RX ANT switch disconnects the internal 2-way splitter and the signal from the antenna goes directly to the TRX. In the path is included RF limiter, bandpass filters and LNA. This increases the gain by 3dB.
NOTE: Despite the high isolation of the RXA, the SDR receiver may exhibit a high level of its own TX signal. This is especially true for SDRs with LNA. Please refer to the Manual for more information and calculations.
version with preamplifier
example: RX signal splitter for two receivers
There are two options in this example. If RXA is turned on, the RX signal is split between both RX outputs (unless the SDR RX switch is turned to the INB RX ANT position). In the second case, RXA can be turned off (by setting the POWER switch to OFF) and the RX signal only passes to SDR RX. Here, it is possible to turn the PREAMP ON to increase the sensitivity of the SDR – suitable for SDRs without their own LNA, for example, SDRs where the ADC is connected directly to the ANT input – TRX-DUO, etc.
example: TRX is transmitting, SDR DL or INB ANT
example for connection with TRX and PA
example with 2-way small splitter
- You can use passive 2-way of 3-way RX splitter (at the RX SDR output) and split signal to more receivers without any bad effect of the insertion loss
Data sheet
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