USED RADIOS 28-69-02A Bird Txrx Vari Notch Cavity Duplexer 4-INCH 470-512

( Brand: Used Radios ), ( Manufacturer Part Number: 28-69-02A ), ( Color: Gold ), ( Type: Infrastructure )

Review USED RADIOS Bird Txrx Vari notch 4-inch Cavity Duplexer Mhz

The **Radios 28-69-02A Bird TXRX Vari-Notch 4-Inch Cavity Duplexer (470-512 MHz)** is a high-performance, precision-engineered duplexer designed to excel in demanding RF applications where signal integrity and reliability are paramount. Built to operate seamlessly within the 470 512 MHz frequency range, this duplexer is ideal for professional radio systems, test equipment, and communication infrastructure where transmit and receive signals must coexist without interference. Its **4-inch cavity design** ensures robust isolation between the transmit and receive paths, minimizing cross-talk and signal degradation while maintaining optimal efficiency. The **Vari-Notch feature** allows for dynamic tuning of the duplexer s notch filter, enabling precise rejection of unwanted signals or harmonics, which is particularly valuable in environments with potential interference or when operating in shared spectrums. Constructed with high-quality materials and advanced cavity tuning techniques, this duplexer delivers exceptional isolation performance typically exceeding **60 dB** while maintaining low insertion loss, ensuring minimal signal attenuation for both transmit and receive channels. Its compact yet durable **4-inch cavity structure** is engineered for stability, reducing thermal drift and mechanical instability that could compromise performance over time. Whether integrated into a base station, test setup, or specialized communication system, the 28-69-02A provides the reliability and precision needed to handle high-power transmit signals while protecting sensitive receive components from overload. With its robust construction, adaptable notch functionality, and proven performance in harsh RF environments, this duplexer stands as a critical component for engineers and technicians seeking uncompromising signal purity and system integrity.

### **Pros and Cons of buying a Yaesu FT-28RU (28-69-02A) with Bird TXRX Vari-Notch 4-Inch Cavity Duplexer (470-512 MHz)**

#### **Pros**

1. **Versatile Transceiver for Amateur Radio**

The Yaesu FT-28RU is a well-regarded dual-band FM transceiver covering 2m (144-148 MHz) and 70cm (430-450 MHz), making it suitable for local VHF/UHF communication. It is a reliable choice for beginners and experienced operators alike, offering clear audio, stable performance, and a user-friendly interface.

2. **Good Build Quality and Reliability**

Yaesu is known for producing durable radios with solid construction. The FT-28RU has a robust metal chassis, which helps with heat dissipation and longevity. Many users report years of trouble-free operation, especially when maintained properly.

3. **FM Mode with Useful Features**

The radio supports FM voice communication, which is ideal for local repeaters, simplex contacts, and emergency communications. It includes features like CTCSS (tone squelch), DCS (digital code squelch), and a built-in noise blanker to improve signal clarity in noisy environments.

4. **Compatibility with External Accessories**

The inclusion of the **Bird TXRX Vari-Notch 4-inch Cavity Duplexer (470-512 MHz)** is a significant advantage. This duplexer allows the radio to operate on the 70cm band (430-450 MHz) while also handling the higher frequencies (470-512 MHz) used in some amateur satellite communications or experimental setups. This makes the setup more flexible for operators interested in expanding beyond standard FM use.

5. **Affordable Entry into VHF/UHF**

Compared to newer or more advanced transceivers (e.g., Yaesu FT-65R, Icom IC-2730A), the FT-28RU is relatively budget-friendly. This makes it an attractive option for those who want a reliable radio without breaking the bank.

6. **Good for Repeater Use**

The radio performs well on FM repeaters, which are widely used for local communication. Its simplicity and reliability make it a favorite among repeaters and club stations.

7. **Easy to Maintain and Repair**

Yaesu radios are well-documented, and spare parts are still available from third-party sellers. This makes repairs and upgrades easier compared to some newer radios with proprietary components.

---

#### **Cons**

1. **Limited Bandwidth and Lack of Digital Modes**

The FT-28RU is strictly an FM transceiver and does not support digital modes like DMR, P25, or APRS. If you are interested in modern digital communication or packet radio, this radio will not meet your needs.

2. **Outdated Technology**

- **USB/LSB modes** (for CW or SSB operation, which are useful for DXing and long-distance communication).

- **Built-in AGC (Automatic Gain Control) tuning** for better signal handling.

- **Modern connectivity options** (e.g., USB for computer interfacing, Bluetooth, or Wi-Fi).

- **Touchscreen or digital display** for easier operation.

This makes it less versatile for advanced users.

3. **No Built-in Memory Channels for Digital Modes**

While it has memory channels for FM, these are not programmable for digital modes, limiting its usefulness in modern amateur radio setups.

4. **Potential for Obsolescence**

As newer radios with better features (e.g., Icom IC-2730A, Kenwood TM-D710) become more affordable, the FT-28RU may feel outdated. While it remains functional, its lack of modern features could be a drawback for users who want to future-proof their investment.

5. **Duplexer Limitations**

The **Bird TXRX Vari-Notch 4-inch Cavity Duplexer (470-512 MHz)** is a useful accessory, but it is not a standard feature on the FT-28RU. This means you will need to purchase it separately, adding to the initial cost. Additionally, duplexers can introduce minor signal losses or require careful tuning for optimal performance.

6. **No Built-in Power Amplifier (PA) for High Power**

The FT-28RU has a maximum power output of **5W (2m) and 2W (70cm)**. While this is sufficient for local communication, it is not ideal for long-distance contacts or high-power applications. If you need higher power, you would need an external amplifier, which adds complexity and cost.

7. **Limited Software Support**

Unlike newer radios with built-in logging software or CAT control (computer-aided tuning), the FT-28RU requires third-party software or manual tuning, which can be less convenient for modern workflows.

---

### **Conclusion**

- **Local repeaters and simplex contacts**

- **Beginner operators** who want a reliable, no-frills radio

- **Users who prioritize simplicity and durability** over advanced features

- **Operators interested in experimenting with higher frequencies (470-512 MHz)** via the duplexer

- **Digital mode users** (DMR, APRS, packet, etc.)

- **Those who want SSB/CW or modern connectivity options**

- **Users who need high power output or advanced tuning features**

- **Operators looking for a long-term investment with future-proofing**

---

### **Recommendation**

- You are primarily interested in **FM communication on 2m and 70cm**.

- You want a **reliable, budget-friendly radio** with good build quality.

- You may need to operate in the **470-512 MHz range** (e.g., for experimental setups or satellite work).

- You are not concerned about **digital modes or advanced features**.

- You want **SSB/CW or digital modes** (e.g., Yaesu FT-65R, Icom IC-2730A, Kenwood TM-D710).

- You need **higher power output** or **modern connectivity** (USB, CAT control).

- You plan to **upgrade your radio in the near future** and want a more versatile unit.

For most **FM-only users on 2m/70cm**, the FT-28RU remains a **great value**, especially when paired with the duplexer for expanded frequency coverage. However, if your needs extend beyond FM, investing in a more modern transceiver may be worth the extra cost.

Details:

FREE Shipping. Money Back Or Replacement.: model Number: 28-69-02A Frequency Range: 470-512 MHz SEPARATION: 3.0 Insertion Loss: 0.8 dB Power Rating: 350 W Isolation: 80 Dimensions: 5.25 x 19 3/-9 Connectors: N Ant, BNC Tx/Rx Bird TXRX VARI-NOTCH 4-INCH CAVITY DUPLEXER 28-69-02A: Unit is in good condition has normal cosmetic wear and been pulled from a working system. Used Radios-live.

Tuning to frequency available.

part #: 286902a prices

• $5.90-$7.90

specifications twowayradiobob:

• brand: Used Radios
• mpn: 28-69-02a
• color: Gold
• type: Infrastructure

seller twowayradiobob:

• rating: 99.8%
• # reviews: 21946
• city: Denver, Colorado

offer twowayradiobob:

• options: Ship-to-home
• availability: In Stock
• quantity: 1
• sold: 0
• started: June 3, 2026

shipping twowayradiobob:

• type: Fixed
• transit: 9-15 Days
• service: Standard
• class: Standard
• cost: $0.00

general twowayradiobob:

• Consumer Electronics > Radio Communication > Walkie Talkies, Two-Way Radios
• condition: Used

returns twowayradiobob:

• policy: Returns Accepted
• paid by: Buyer
• method: Money back
• time: 30 Days

payments twowayradiobob:

• other
• credit card: Diners-club
• wallet: Google-pay

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