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Call 0345 2300 599The RX Audite SDR Antenna Switch from QRO.cz is a powerful all-in-one solution that combines a T/R switch, dedicated receive antenna input, receive splitter with specialized switching, and RF limiter protection — all in a compact, station-ready unit.
Designed by Jan Šustr, the RX-Audite was created to solve a common problem in modern Amateur Radio stations: how to monitor the bands with an SDR while actively transmitting — without risking damage to sensitive SDR hardware.
Whether you're running a spectrum panadapter, WebSDR, or a Skimmer Server contributing spots to the Reverse Beacon Network (RBN), the RX-Audite makes integration seamless and safe.
Key Features
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Frequency Coverage: 100 kHz – 60 MHz (160m through 6m)
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Max Transmit Power Handling: 200 Watts
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High IP3 Internal Preamplifier
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Variable gain up to 14 dB
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Ideal for insertion loss compensation
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Switchable ON for SDR RX output (even when controller is OFF)
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Built-In RF Power Limiter Protection
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100 dB Isolation During Transmit
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Dedicated INBAND RX ANT Input
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Selectable SDR Source (Main TX/RX Antenna or INBAND RX ANT)
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Internal Dummy Load Option for SDR During TX (jumper selectable)
How It Works
The RX-Audite installs directly in the feedline between your transceiver and amplifier or transmitting antenna.
When PTT is NOT Active:
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The main TX/RX antenna is diverted to the SDR RX output.
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10 mW RF limiter protection safeguards the SDR.
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The internal high IP3 preamp can be engaged for gain compensation.
When PTT is Active:
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The SDR port is bypassed with approximately 100 dB isolation.
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The transceiver operates normally into the antenna.
Controller Modes:
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Controller OFF:
Main TX/RX antenna feeds SDR RX output (protected). -
Controller ON:
Main TX/RX antenna is shared between TRX and SDR outputs. -
Front Panel Switch:
Selects SDR RX output source (Main TX/RX or INBAND RX ANT).
Advanced Multi-Layer Protection
The RX-Audite includes extensive protective circuitry to safeguard both your transceiver and SDR:
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Neon tubes
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Gas discharge tubes
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Resettable PTC fuses
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RF power limiter
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Automatic isolation during TX
If PTT is not properly asserted due to operator error or equipment failure:
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A resettable fuse protects the unit.
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The RX-Audite presents an open circuit to the transceiver.
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Your radio’s SWR protection reduces power.
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The SDR remains shielded from RF damage.
This makes it ideal for:
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Contest stations
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Multi-operator environments
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High RF density sites
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SDR panadapter installations
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Skimmer servers feeding the Reverse Beacon Network
Shipping & Delivery
We offer UK and international delivery services, including next working day and selected weekend options for eligible orders. Available services, prices and estimated delivery times are displayed at checkout.
Delivery Information
Delivery options depend on the parcel's size, weight, contents and destination. Express and weekend services are subject to availability and cut-off times. Oversized or exceptionally heavy items may require a specialist delivery quotation.
Returns & Cancellations
To arrange a return, please contact ML&S or complete our returns form. You may also exercise your statutory right to cancel by email or another clear statement, without completing the form.
Changed Your Mind?
Under the Consumer Contracts Regulations 2013, most purchases made online or by telephone can be cancelled within 14 days of receipt.
You must notify us of your cancellation within this period and return the goods within a further 14 days.
Please handle all goods with care. Returned items must be in a resaleable condition, complete with their original packaging, and all supplied accessories.
You may inspect goods as you would in a shop. Handling beyond what is necessary to inspect them may result in a lawful deduction for diminished value.
Exceptions
Modified Equipment & Reversal Charges
Additional return conditions may apply to equipment modified at the customer's request, including wideband transmit or receive modifications.
ML&S may charge a reasonable fee to reverse physical modifications and restore the equipment to its original factory specification. Any such charge will be agreed in advance and deducted from your refund.
Custom-Made Cable Assemblies
Coaxial cable assemblies manufactured to a customer's specifications are excluded from the 14-day return policy and are non-refundable unless faulty.
Software & Labour Charges
Labour and modification charges requested by the customer are non-refundable once the work has been completed.
Computer software may only be returned under the 14-day return policy if it remains sealed and unopened.
Return Postage Charges
Customers are responsible for the direct cost of returning unwanted or incorrectly ordered goods, where permitted by law. You may arrange your own suitable return postage or use one of our optional prepaid services.
Standard Parcels
Royal Mail Return Label
£5.95
Per parcel
For eligible standard-sized parcels, subject to Royal Mail restrictions. Free collection included.
Larger Parcels
DPD Return Label
£7.95
Per parcel
For larger or heavier parcels and any shipments with batteries.
Collection Service
DPD Collection
£25.00
Per parcel
Available upon request for eligible addresses, subject to availability.
Prepaid return charges will be confirmed before booking and deducted from your refund.
These prices apply to eligible UK mainland returns. Oversized items, specialist products and returns from other destinations may require a separate quotation. Estimated return costs will be disclosed before purchase.
Faulty or Incorrectly Supplied Goods
Return postage charges do not apply to faulty, damaged or incorrectly supplied goods returned under statutory rights. ML&S will arrange a free return in these circumstances.
Refunds
Refunds are processed without undue delay following receipt and inspection of returned goods, and no later than 14 days after we receive goods returned under statutory cancellation rights.
Refunds will be issued to the original payment method. Any prepaid return postage charges or lawful deductions for diminished value will be itemised.
Warranty Terms & Conditions
New Equipment Warranty
Minimum 2-Year Warranty
All new products supplied by ML&S carry a minimum two-year warranty against manufacturing defects, excluding batteries, which are covered by separate warranty terms.
Some manufacturers provide extended warranties, such as the three-year warranty available on eligible Yaesu equipment. Any additional coverage is subject to the manufacturer's terms and conditions.
Our workshop may assess and repair faulty equipment on site or refer it to the manufacturer or an authorised service centre where necessary.
Warranty exclusions may include batteries, normal wear and tear, accidental damage, misuse and unauthorised modifications, as specified in the applicable warranty terms.
All warranties are provided in addition to your statutory consumer rights against ML&S, which are not limited by the warranty period.
International Returns & Warranty
Unless otherwise stated, ML&S warranty servicing is carried out in the UK. International customers must contact us before returning goods to confirm shipping and customs requirements.
International customers are responsible for return postage unless the goods are faulty and ML&S has been notified within a reasonable time.
ML&S accepts no responsibility for additional charges resulting from incorrectly completed customs documentation. Any additional duties charged to ML&S as a result will be billed to the customer before return of the goods.
Need Help With a Return?
Our team can assist with returns, postage arrangements, modifications and warranty claims.
Nothing in these terms excludes or limits your statutory consumer rights.


