---
product_id: 37024275
title: "Balun-B1S - E1 Passive impedance Adapter 75 ohm BNC Female to 120ohm Twisted Pair"
brand: "ctcunion"
price: "$1.11"
currency: USD
in_stock: false
url: https://www.desertcart.ec/products/37024275-balun-b1s-e1-passive-impedance-adapter-75-ohm-bnc-female
store_origin: EC
region: Ecuador
---

# No power needed Compact & lightweight 75Ω to 120Ω conversion Balun-B1S - E1 Passive impedance Adapter 75 ohm BNC Female to 120ohm Twisted Pair

**Brand:** ctcunion
**Price:** $1.11
**Availability:** ❌ Out of Stock

## Summary

> 🔗 Connect with Confidence!

## Quick Answers

- **What is this?** Balun-B1S - E1 Passive impedance Adapter 75 ohm BNC Female to 120ohm Twisted Pair by ctcunion
- **How much does it cost?** $1.11 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.ec](https://www.desertcart.ec/products/37024275-balun-b1s-e1-passive-impedance-adapter-75-ohm-bnc-female)

## Best For

- ctcunion enthusiasts

## Why This Product

- Trusted ctcunion brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Compact Design:** Lightweight and space-saving for easy installation.
- • **Seamless Connectivity:** Effortlessly convert BNC coax to RJ48c twisted pair.
- • **Power-Free Performance:** Enjoy hassle-free operation with no power requirements.
- • **Cost-Effective Solution:** Achieve high-quality performance without breaking the bank.
- • **Versatile Compatibility:** Connects seamlessly with various networking setups.

## Overview

The Balun-B1S is a high-performance passive impedance adapter that facilitates the conversion between 75 ohm BNC coaxial connections and 120 ohm RJ48c twisted pair lines. Its compact design ensures easy integration into any setup, while the power-free operation makes it a cost-effective and efficient choice for professionals.

## Description

The Balun-B1S device allows conversion of E1 signal from balanced to unbalanced and back. BNC 75ohm interface is passively converted to 120 balanced twisted pair copper. Balun-B1S converts only one single BNC. For a complete E1 conversion two Balun-B1S units are required.

## Features

- Conversion between BNC coax 75ohm and RJ48c twisted pair 120ohm
- Low cost and compact and light design
- No power required
- Connectors: one female BNC and one RJ48c shielded
- RJ48c pin assignment: P4(+), P5(-)

## Product Details

- **Specific Uses For Product:** personal
- **Connector Type:** bnc
- **Brand:** CTCUnion
- **Item Weight:** 1.6 ounces
- **Number of Ports:** 1

## Images

![Balun-B1S - E1 Passive impedance Adapter 75 ohm BNC Female to 120ohm Twisted Pair - Image 1](https://m.media-amazon.com/images/I/41cHU57hMmL.jpg)
![Balun-B1S - E1 Passive impedance Adapter 75 ohm BNC Female to 120ohm Twisted Pair - Image 2](https://m.media-amazon.com/images/I/31mma6JimRL.jpg)
![Balun-B1S - E1 Passive impedance Adapter 75 ohm BNC Female to 120ohm Twisted Pair - Image 3](https://m.media-amazon.com/images/I/31MqjjGe-QL.jpg)

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**Shop now:** [https://www.desertcart.ec/products/37024275-balun-b1s-e1-passive-impedance-adapter-75-ohm-bnc-female](https://www.desertcart.ec/products/37024275-balun-b1s-e1-passive-impedance-adapter-75-ohm-bnc-female)

---

*Product available on Desertcart Ecuador*
*Store origin: EC*
*Last updated: 2026-02-24*