COLLINS Radio KWM-1 70K-1 3.455 3.545MHZ

( Brand: Collins ), ( Manufacturer Part Number: 70K1 ), ( Type: Ham Radio Transceiver ), ( Country Of Origin: United States )

Review COLLINS Radio Pto 3.455 To 3.545mhz

The **Collins 70K-1 KWM-1 Radio** is a legendary, high-performance military-grade shortwave transceiver designed for unparalleled reliability, versatility, and durability in the most demanding communication environments. Built to exacting military specifications, this rugged radio operates in the **3.455 to 3.545 MHz** range, making it an ideal choice for secure, long-range voice and data transmission across vast distances, including over-the-horizon and beyond-line-of-sight applications. Engineered by Collins Radio now part of the Raytheon Company this transceiver was originally developed for the U.S. military and remains a benchmark for professional and emergency communications due to its exceptional build quality and advanced technical capabilities.

The **70K-1 KWM-1** is a **single-sideband (SSB) radio**, delivering crystal-clear audio transmission with minimal interference, making it perfect for military, government, maritime, and aviation use where clarity and security are paramount. Its **3.455 3.545 MHz frequency range** is particularly well-suited for high-frequency (HF) propagation, allowing operators to exploit optimal ionospheric conditions for global reach. The radio features a **modular design**, enabling easy upgrades and maintenance, while its **military-grade construction** ensures resistance to extreme temperatures, humidity, and mechanical stress making it dependable in harsh operational environments.

At its core, the **70K-1 KWM-1** incorporates a **high-stability crystal-controlled oscillator** for precise frequency accuracy, paired with a **powerful transmitter** capable of delivering robust signal strength even under challenging conditions. The unit includes **dual-channel operation**, allowing for simultaneous receive and transmit functions, which enhances efficiency in critical communication scenarios. Its **adjustable power output** (ranging from low-wattage for stealth operations to high-power for long-distance coverage) provides operators with flexibility depending on mission requirements.

The radio s **front panel** is intuitive yet robust, featuring a **dial-based tuning system** for precise frequency selection, along with **knobs for volume, squelch, and transmit/receive switching**. The **rear panel** houses essential connections, including **antenna inputs, power supply terminals, and auxiliary ports** for interfacing with external equipment. The **KWM-1 designation** indicates its compatibility with the **KWM-1 transceiver**, which was often paired with it in military systems, further expanding its utility in complex communication networks.

Beyond its technical prowess, the **Collins 70K-1 KWM-1** is celebrated for its **longevity and adaptability**. Originally deployed in the mid-20th century, many units remain in service today due to their **superior reliability** a testament to Collins engineering excellence. Whether used in **military field operations, emergency response, or long-range amateur radio applications**, this radio continues to be a trusted workhorse for those requiring **uncompromising performance and durability**.

For collectors, operators, and enthusiasts seeking a **true vintage military-grade radio**, the **Collins 70K-1 KWM-1** stands as a symbol of innovation and endurance. Its **timeless design, robust construction, and unmatched functionality** make it a prized asset in any communication setup where **precision, security, and dependability** are non-negotiable. Whether restored to pristine condition or preserved in its original military configuration, this radio remains a **cornerstone of high-frequency communication technology**.

### **Pros and Cons of buying a Collins 70K-1 KWM-1 Radio (3.455 3.545 MHz)**

#### **Pros**

1. **Reliability and Durability** The Collins KWM-1 is a vintage military-grade radio known for its robust construction, high-quality components, and long-term reliability. Many units still operate flawlessly after decades of use, especially when properly maintained.

2. **High Performance in HF Bands** Designed for military and government use, the KWM-1 excels in the 10-meter band (3.455 3.545 MHz) with strong signal handling, low noise, and excellent selectivity. It is well-suited for long-distance communication, including emergency and tactical use.

3. **Modular and Upgradable** The KWM-1 was built with modularity in mind. Many components (such as power amplifiers, filters, and tuners) can be replaced or upgraded, extending its lifespan and adaptability to modern needs.

4. **Proven in Extreme Conditions** Originally used in military and aviation applications, the KWM-1 is built to withstand harsh environments, including high temperatures, vibration, and electrical interference.

5. **Strong Community and Support** Due to its popularity among ham radio operators and military enthusiasts, there is a well-established community for troubleshooting, parts sourcing, and restoration. Manuals, schematics, and repair guides are widely available.

6. **Excellent for Emergency and Tactical Use** Its rugged design and high power output (up to 100W) make it ideal for emergency communications, disaster response, and off-grid scenarios where reliability is critical.

7. **Aesthetic and Historical Value** For collectors and enthusiasts, the KWM-1 holds significant historical and aesthetic appeal, often considered a classic in radio technology.

8. **Compatibility with Modern Gear** With the right interfaces (e.g., USB or CAT control), the KWM-1 can be integrated into modern digital logging and antenna tuning systems.

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#### **Cons**

1. **High Initial Cost** A well-functioning KWM-1 in good condition can be expensive, especially if it is restored or comes with original military specifications. Prices often range from $2,000 to $5,000 or more, depending on condition and rarity.

2. **Maintenance and Repair Complexity** While the radio is durable, its internal components (such as vacuum tubes, transformers, and relays) require specialized knowledge to repair or replace. Many parts are obsolete, necessitating sourcing from vintage suppliers or rebuilding from scratch.

3. **Power Consumption** The KWM-1 is a power-hungry unit, requiring a stable 115V AC supply (or a high-quality DC power converter). This can be a drawback for portable or off-grid setups without adequate power sources.

4. **Weight and Size** At approximately 40 lbs (18 kg), the KWM-1 is heavy and bulky, making it less practical for mobile or portable operations compared to modern solid-state radios.

5. **Learning Curve** Operating a tube-based radio like the KWM-1 requires familiarity with vacuum tube technology, tuning procedures, and troubleshooting methods that differ from modern solid-state radios. Beginners may find it intimidating.

6. **Limited Modern Features** Unlike contemporary HF radios, the KWM-1 lacks built-in digital features such as DSP, automatic antenna tuners, or modern modulation formats (e.g., digital voice modes). It relies on analog tuning and manual adjustments.

7. **Part Availability and Obsolescence** While some parts are still available, others (such as specific tubes, relays, or connectors) may be difficult to find. Rebuilding a KWM-1 often requires sourcing from eBay, military surplus, or specialized vendors.

8. **Not Ideal for Beginners** Due to its complexity, the KWM-1 is better suited for experienced operators who are comfortable with radio maintenance and troubleshooting. Novices may find it frustrating to set up and operate.

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### **Conclusion**

The Collins KWM-1 is a **highly capable, durable, and historically significant** HF radio that remains a favorite among enthusiasts, military hobbyists, and emergency communicators. Its strengths lie in its reliability, performance, and adaptability, making it an excellent choice for those who prioritize robustness and historical value over modern convenience.

However, its **high cost, maintenance demands, and complexity** make it less suitable for casual users or those seeking a plug-and-play solution. If you are an experienced radio operator with mechanical aptitude, a passion for vintage technology, or a need for a rugged, high-performance radio, the KWM-1 is a worthwhile investment. For most modern ham radio operators, a contemporary solid-state HF radio (e.g., Yaesu FT-1000MP, Icom IC-7300, or Elecraft K3) may offer better ease of use and features without the maintenance burden.

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### **Recommendation**

- You are an experienced radio operator or enthusiast with mechanical skills.

- You prioritize reliability, historical value, or military-grade performance.

- You are prepared to invest time and effort in maintenance, repairs, and upgrades.

- You plan to use it for emergency communications, tactical operations, or as a collector s piece.

- You are a beginner or prefer modern, user-friendly radios.

- You lack the technical skills or patience for repairs and troubleshooting.

- You need portability, digital features, or a lower power consumption setup.

- You are on a tight budget, as modern HF radios offer comparable performance at a fraction of the cost.

For most users, a **modern HF radio with digital capabilities** (e.g., Yaesu FT-2000, Icom IC-7610, or FlexRadio 6700) would be a more practical choice. However, if you are drawn to the KWM-1 s legacy and performance, it remains a fantastic radio for the right owner.

Details:

Items come as pictured see all pictures.

part #: 70k1 prices

• $13.99-$69.00

specifications hamamateuradio:

• brand: Collins
• mpn: 70k1
• type: Ham Radio Transceiver
• country of origin: United States

offer hamamateuradio:

• availability: In Stock
• sold: 0
• options: Ship-to-home
• started: April 13, 2026
• quantity: 1
• best offers: True

general hamamateuradio:

• Radio Communication > Ham, Amateur Radio > Ham Radio Transceivers
• condition: Used

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• wallet: Apple-pay
• other
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returns hamamateuradio:

• policy: No Returns

seller hamamateuradio:

• city: Davenport, Iowa
• # reviews: 5086
• rating: 99.4%

shipping hamamateuradio:

• service: USPS Ground Advantage
• carrier: USPS
• cost: $0.00
• class: Standard
• transit: 4-10 Days
• type: Fixed

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