DX Engineering RPA-2 Modular Receive Preamplifier
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449.08 $
In stock
Key Features
- Low-noise design that preserves system noise floor
- ~16 dB nominal gain across 0.3–35 MHz
- High dynamic range with excellent IMD performance
- Modular architecture with internal plug-in slot
- Front-end protection and 75 Ω→50 Ω transformer modules (optional)
- Flexible power: 12–18 V DC via jack or (if configured) through coax
- Receive-only I/O using clearly distinct connectors to avoid TX hookup
- Compact, rugged enclosure suited for shack or remote RX sites
Applications
- Shortwave listening (SWL) and broadcast DX
- Ham radio receive antenna systems (beverage, loop, long-wire)
- Medium-wave/AM DXing
- Remote/quiet-site SDR front-ends
Specifications
| Frequency Range | 0.3–35 MHz |
|---|---|
| Gain | ~16 dB (typ.) |
| Noise Figure | ≈ 3–4 dB (typ.) |
| Dynamic Range | High; optimized for crowded HF band conditions |
| 1 dB Compression | High output power handling (see manual) |
| Connectors | Receive-only RF connectors (female) for clear TX avoidance |
| Power | 12–18 V DC, ~140 mA (max) |
| Modular Slot | Accepts optional plug-in modules (protection, 75→50 Ω, etc.) |
| Dimensions / Weight | Compact desktop unit (see manual) |
Notes: Specifications are typical. See the official manual for exact data.
Optional Plug-In Modules
- Receiver input protection module (e.g., surge/overload mitigation)
- 75 Ω → 50 Ω transformer module (use 75 Ω feedlines with 50 Ω gear)
Installation & Powering
- Use a clean, regulated DC supply; avoid switch-mode noise sources
- Power via DC jack or (if configured) feed DC via the coax
- Ground the enclosure and use quality coax to maintain low noise
- Receive-only device: never place in a transmit RF path
What’s in the Box
- DX Engineering RPA-2 preamplifier
- Filler cover for module slot (if applicable)
- Quick start / manual
- Mounting hardware (if included)
FAQ
Can I transmit through the RPA-2?
No. The RPA-2 is a receive-only preamplifier. Never place it in a transmit path.
Does it help weak-signal reception on crowded bands?
Yes. With proper filtering and a quiet DC supply, the preamp’s low noise and high linearity can improve intelligibility of weak signals.
How do I power it?
Use a clean 12–18 V DC supply. Some setups can be configured to feed DC via the coax; check the manual for jumper configuration.
Which antennas are recommended?
Works well with beverage, loop, and long-wire receive antennas, as well as wideband RX elements for SDR.
Related products
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Transceiver Accessories
Frequency Extension
Frequency extension to allow for TX outside of amateur radio bands. We will modify your radio before delivery.
NOTE: This options is for NEW radios. If you are sending your radio to us for modification, chose this modification which includes return shipping fee.
SKU: TXMOD
