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Balun One Nine v2 - 1:9 HF Impedance Transformer
Unlock the full potential of your SDR receiver or HF radio with the Balun One Nine v2, a precision 1:9 impedance transformer designed for wideband shortwave listening. Perfect for pairing with long wire antennas, this compact balun delivers clean signal matching from low frequencies through HF bands. Ships from Bengaluru with full warranty and dedicated technical support from The Engineer Store.
Specifications
| Specification | Value |
| Type | 1:9 Unun (Impedance Transformer) |
| Impedance Ratio | 50Ohm to 450Ohm |
| Frequency Range | 0.5 MHz - 30 MHz (HF Band) |
| Input Connector | SMA Female (50Ohm side) |
| Antenna Connection | Screw Terminals (high-impedance side) |
| Core Material | High-permeability Ferrite Toroid |
| PCB | Gold-plated, compact form factor |
| Insertion Loss | Less than 1 dB across operating range |
| Dimensions | 54 mm x 25 mm x 25 mm |
| Version | v2 (improved winding and PCB layout) |
Why Choose This?
- Superior Build Over Generic Baluns: The v2 features a gold-plated PCB and precision-wound ferrite toroid, delivering consistent impedance matching and lower insertion loss compared to cheap hand-wound alternatives that degrade signal quality.
- Wideband HF Coverage in One Device: Covers 0.5 MHz to 30 MHz, letting you connect a simple long wire antenna to any 50Ohm SDR dongle or receiver and immediately start pulling in shortwave broadcasts, amateur radio, and utility signals.
- Bengaluru-Based Expert Support: Get fast shipping across India, hassle-free warranty, and access to a technical support team that understands RF and SDR applications - no waiting on overseas sellers.
Project Ideas
- RTL-SDR Shortwave Receiver: Connect a 10-20 metre wire antenna through the Balun One Nine v2 to your RTL-SDR dongle and explore HF broadcasts, amateur radio, and SIGINT from your rooftop in Bengaluru.
- Portable HF Monitoring Station: Pair with a telescopic whip or throw wire and a portable SDR for field-day monitoring, disaster communication awareness, or amateur radio contesting.
- End-Fed Half-Wave Antenna System: Use the balun as the feedpoint transformer for an EFHW antenna build, matching high-impedance antenna endpoints to your 50Ohm transceiver or receiver.
What's in the Box
- Balun One Nine v2 - 1:9 Impedance Transformer Module
- SMA Female connector pre-soldered on 50Ohm side
- Screw terminals for antenna wire connection
Frequently Asked Questions
What does a 1:9 balun do?
It transforms impedance by a 1:9 ratio, converting a 450Ohm high-impedance long wire antenna down to 50Ohm, which is the standard impedance for SDR receivers, amateur radios, and most RF equipment. This ensures maximum power transfer and minimal signal loss.
Can I use this with an RTL-SDR dongle?
Yes. The SMA output connects directly to RTL-SDR dongles and other popular SDR receivers. Simply attach a long wire antenna to the screw terminals and you have a capable HF receiving setup.
How long should my antenna wire be?
For general shortwave listening, a wire between 10 and 20 metres works well. Longer wires capture more signal but may pick up more noise. Experiment based on your location and target frequencies.
Is this a balun or an unun?
Technically it is an unun (unbalanced-to-unbalanced transformer), since both the coax side and the long wire side are unbalanced. The "Balun One Nine" name is a popular community convention for this design.
Can I transmit through this balun?
The Balun One Nine v2 is designed primarily for receive applications. It is not rated for transmit power. For QRP or higher-power transmitting, use a dedicated transmit-rated balun with appropriate power handling.
Does it need a ground connection?
Adding a ground wire or counterpoise to the second screw terminal significantly improves performance by reducing noise and stabilizing impedance. A ground rod or a few metres of counterpoise wire is recommended.
Buy Balun One Nine v2 Online in India
Purchase the Balun One Nine v2 online at The Engineer Store - India's most trusted electronics components store. We deliver across all major cities including Bengaluru, Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata, Ahmedabad, Jaipur, and Surat. Get the best price on Balun One Nine v2 with fast 1-5 day shipping from our Bengaluru warehouse. All products are 100% authentic, sourced from authorized distributors with 7-day warranty on manufacturing defects.
Looking to buy Balun One Nine v2 at the best price in India? The Engineer Store offers competitive pricing, bulk discounts for orders of 10+ units, and dedicated technical support via email and WhatsApp. Whether you are a hobbyist, student, or professional engineer, we have everything you need for your electronics projects.
Balun One Nine v2 - 1:9 HF Impedance Transformer
Unlock the full potential of your SDR receiver or HF radio with the Balun One Nine v2, a precision 1:9 impedance transformer designed for wideband shortwave listening. Perfect for pairing with long wire antennas, this compact balun delivers clean signal matching from low frequencies through HF bands. Ships from Bengaluru with full warranty and dedicated technical support from The Engineer Store.
Specifications
| Specification | Value |
| Type | 1:9 Unun (Impedance Transformer) |
| Impedance Ratio | 50Ohm to 450Ohm |
| Frequency Range | 0.5 MHz - 30 MHz (HF Band) |
| Input Connector | SMA Female (50Ohm side) |
| Antenna Connection | Screw Terminals (high-impedance side) |
| Core Material | High-permeability Ferrite Toroid |
| PCB | Gold-plated, compact form factor |
| Insertion Loss | Less than 1 dB across operating range |
| Dimensions | 54 mm x 25 mm x 25 mm |
| Version | v2 (improved winding and PCB layout) |
Why Choose This?
- Superior Build Over Generic Baluns: The v2 features a gold-plated PCB and precision-wound ferrite toroid, delivering consistent impedance matching and lower insertion loss compared to cheap hand-wound alternatives that degrade signal quality.
- Wideband HF Coverage in One Device: Covers 0.5 MHz to 30 MHz, letting you connect a simple long wire antenna to any 50Ohm SDR dongle or receiver and immediately start pulling in shortwave broadcasts, amateur radio, and utility signals.
- Bengaluru-Based Expert Support: Get fast shipping across India, hassle-free warranty, and access to a technical support team that understands RF and SDR applications - no waiting on overseas sellers.
Project Ideas
- RTL-SDR Shortwave Receiver: Connect a 10-20 metre wire antenna through the Balun One Nine v2 to your RTL-SDR dongle and explore HF broadcasts, amateur radio, and SIGINT from your rooftop in Bengaluru.
- Portable HF Monitoring Station: Pair with a telescopic whip or throw wire and a portable SDR for field-day monitoring, disaster communication awareness, or amateur radio contesting.
- End-Fed Half-Wave Antenna System: Use the balun as the feedpoint transformer for an EFHW antenna build, matching high-impedance antenna endpoints to your 50Ohm transceiver or receiver.
What's in the Box
- Balun One Nine v2 - 1:9 Impedance Transformer Module
- SMA Female connector pre-soldered on 50Ohm side
- Screw terminals for antenna wire connection
Frequently Asked Questions
What does a 1:9 balun do?
It transforms impedance by a 1:9 ratio, converting a 450Ohm high-impedance long wire antenna down to 50Ohm, which is the standard impedance for SDR receivers, amateur radios, and most RF equipment. This ensures maximum power transfer and minimal signal loss.
Can I use this with an RTL-SDR dongle?
Yes. The SMA output connects directly to RTL-SDR dongles and other popular SDR receivers. Simply attach a long wire antenna to the screw terminals and you have a capable HF receiving setup.
How long should my antenna wire be?
For general shortwave listening, a wire between 10 and 20 metres works well. Longer wires capture more signal but may pick up more noise. Experiment based on your location and target frequencies.
Is this a balun or an unun?
Technically it is an unun (unbalanced-to-unbalanced transformer), since both the coax side and the long wire side are unbalanced. The "Balun One Nine" name is a popular community convention for this design.
Can I transmit through this balun?
The Balun One Nine v2 is designed primarily for receive applications. It is not rated for transmit power. For QRP or higher-power transmitting, use a dedicated transmit-rated balun with appropriate power handling.
Does it need a ground connection?
Adding a ground wire or counterpoise to the second screw terminal significantly improves performance by reducing noise and stabilizing impedance. A ground rod or a few metres of counterpoise wire is recommended.
Buy Balun One Nine v2 Online in India
Purchase the Balun One Nine v2 online at The Engineer Store - India's most trusted electronics components store. We deliver across all major cities including Bengaluru, Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata, Ahmedabad, Jaipur, and Surat. Get the best price on Balun One Nine v2 with fast 1-5 day shipping from our Bengaluru warehouse. All products are 100% authentic, sourced from authorized distributors with 7-day warranty on manufacturing defects.
Looking to buy Balun One Nine v2 at the best price in India? The Engineer Store offers competitive pricing, bulk discounts for orders of 10+ units, and dedicated technical support via email and WhatsApp. Whether you are a hobbyist, student, or professional engineer, we have everything you need for your electronics projects.