| Code | Model | Audio switch | Isolation |
|---|---|---|---|
| ASW-2 | Standard | Yes | Standard |
| ASW-2 E | Entry Level | No | Standard |
| ASW-2 H | High Isolation | Yes | High |
ELAD ASW-2 is an Rx / Tx automatic switch that normally connects the antenna to the RX output. When it detects RF power on the RTX input (max. 100 W), the antenna is connected to the RTX input and the RX output (receiver input) is grounded to protect the receiver. Instead of using RF power detection to switch the antenna, a control input allows the key / keyer or the PTT line to switch the antenna. It works in all modes: CW, AM, SSB, FM and digital. Individually tested up to VHF. The audio switch is available for both the receiver audio and the transceiver audio. The ASW-2 is compatible with any receiver and any HF transceiver or HF transmitter.
Technical specifications
- 50Ω impedance.
- Protection with gas discharge tubes on the ANTENNA connector.
- Frequency range: DC – 160 MHz.
- Power supply: 13.8 Vdc, 200 mA.
- Maximum power on the RTX input: 100 W.
- RF detection threshold: < 10 mW (tested from 1.8 MHz to 30 MHz).
- Switching time: < 20 ms. Release time: adjustable from 150ms to 3s.
- Insertion loss: < 0.2 dB at 144 MHz (0.15 dB typical).
- RX/TX and audio switching with relays.
- Receive path isolated and grounded by an additional relay during transmission to improve ANTENNA/RX isolation.
- Receive isolation: see the relevant sections in the user manual.
- Audio switch designed for CW operation, allowing real-time sidetone (no SDR latency).
- Audio switch implemented with a dry contact, allowing use for other purposes (delayed PTT chain, auxiliary PTT, bias injection).
- Default ANTENNA-RTX connection when unpowered to avoid damage to the transceiver.
