ROCKWELL COLLINS RADIO 522-0873-00 Repair 70K-1 KWM-1 3.455 3.545MHZ

( Brand: Rockwell Collins Radio ), ( Manufacturer Part Number: 522-0873-00 ), ( Model: 70K-1 ), ( Band: Hf ), ( Number Of Channels: Pto ), ( Type: Pto Vfo ), ( Compatible Product: Receiver-transmitter, Collins Kwm-1 ), ( Frequency Range: 3.455 To 3.545mhz ), ( Band Type: Mono Band ), ( Color: Silver ), ( Supported Modes: Cw, Ssb ), ( Country Of Origin: United States )

Review ROCKWELL COLLINS RADIO Two Pto 3.455 To 3.545mhz As is Parts Or Repair

The **Rockwell Collins KWM-1 70K-1 (Part Number: 522-0873-00)** is a robust, military-grade **HF (High-Frequency) radio transceiver** designed for reliable long-range communications in demanding environments. Originally manufactured by Rockwell Collins (now part of Collins Aerospace), this unit operates within the **3.455 3.545 MHz frequency range**, making it well-suited for government, defense, or emergency response applications where secure, high-performance radio communication is critical. Built with a rugged, military-grade construction, the KWM-1 is engineered to withstand harsh conditions, including extreme temperatures, vibration, and electromagnetic interference, ensuring dependable operation in field or mobile deployments. This **as-is for repair** unit represents a high-value asset for operators seeking a reliable, legacy HF radio system, though it may require professional servicing to restore full functionality. The KWM-1 features a **phase-locked loop (PLL) synthesizer** for precise frequency stability, along with **SSB (Single Sideband) modulation** for efficient long-distance transmission. Its compact yet durable design allows for easy integration into vehicles, ships, or fixed installations, while its historical reliability makes it a trusted choice for legacy communication networks. Whether used for military exercises, emergency coordination, or specialized government applications, this radio remains a dependable workhorse for those requiring proven HF communication technology. Potential buyers should note that while the unit may exhibit signs of wear or require refurbishment, its core components including the **tuned circuits, power amplifier, and receiver sections** remain robust, offering a cost-effective alternative to newer HF radios for those prioritizing performance and durability over cutting-edge features.

Buying a used **Rockwell Collins KWM-1 70kW radio** (model 522-0873-00, operating in the 3.455 3.545 MHz range) for repair as-is involves several key considerations. Below is a detailed breakdown of the pros and cons, followed by a conclusion and recommendation.

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### **Pros of Purchasing a Used KWM-1 for Repair**

1. **High Power and Reliability for Broadcast**

The KWM-1 is a robust, high-power (70kW) radio designed for AM broadcast applications. Its solid-state and tube hybrid architecture (depending on the variant) provides strong signal output, making it suitable for large coverage areas. If properly maintained, it can deliver consistent performance for years.

2. **Proven Legacy Technology**

Rockwell Collins (formerly Collins Radio) was a leader in broadcast equipment, and the KWM-1 has a long history of use in commercial and military applications. This means parts, schematics, and repair resources are widely available, especially from vintage electronics suppliers or broadcast equipment dealers.

3. **Potential for Cost Savings**

Purchasing a used unit can be significantly cheaper than buying new equipment, especially if the radio is in functional condition and only requires minor repairs. New high-power broadcast radios (e.g., from Nautel, Harris, or Comrex) can cost hundreds of thousands of dollars, whereas a used KWM-1 might be available for a fraction of that price.

4. **Compatibility with Existing Infrastructure**

If the radio is already integrated into a broadcast facility s antenna system, power distribution, or control networks, repurposing it may avoid the need for additional infrastructure upgrades. This can be advantageous if the facility is legacy-focused or lacks budget for new installations.

5. **Resale or Secondary Market Value**

If the radio is restored to working order, it may retain value in the used market, particularly for collectors, military surplus buyers, or smaller broadcast stations with limited budgets.

6. **Opportunity for Customization or Upgrades**

Some KWM-1 models allow for modifications, such as frequency adjustments or the addition of modern control interfaces. Skilled technicians could potentially upgrade components (e.g., replacing aging tubes or capacitors) to extend its lifespan.

7. **Ease of Testing and Troubleshooting**

The KWM-1 s design is relatively straightforward compared to modern digital radios, making it easier for experienced technicians to diagnose issues. Many repair guides, service manuals, and forums (e.g., broadcast equipment groups on Facebook or Reddit) exist to assist with troubleshooting.

8. **Environmental and Logistical Advantages**

Repurposing existing equipment reduces electronic waste and avoids the need for shipping or installing new gear, which can be time-consuming and costly.

---

### **Cons of Purchasing a Used KWM-1 for Repair**

1. **Age-Related Wear and Tear**

The KWM-1 is a vintage radio, likely decades old. Key components such as tubes (if applicable), capacitors, resistors, and solder joints may degrade over time, leading to intermittent failures or complete breakdowns. Tubes, in particular, have finite lifespans and may need frequent replacement.

2. **High Repair Costs**

While parts are available, restoring the radio to full functionality can be expensive. Critical components like power amplifiers, modulators, or RF sections may require specialized parts or skilled labor. If the radio is severely degraded, the cost of repair could exceed the value of the unit.

3. **Limited Modern Compatibility**

- Digital interfaces (e.g., Ethernet, USB, or IP control).

- Automatic tuning or frequency synthesis.

- Built-in diagnostics or remote monitoring.

Upgrading these features would require significant modifications or external add-ons.

4. **Regulatory and Safety Concerns**

Older radios may not comply with current FCC or ITU regulations regarding emissions, spurious signals, or digital sidebands. Retuning or modifying the radio to meet modern standards could be complex and may require certification testing.

5. **Power Supply and Infrastructure Requirements**

The KWM-1 typically requires high-voltage power supplies (e.g., 48V or 120VAC) and may need a dedicated cooling system. If the facility s infrastructure is outdated, additional investments in power conditioning or ventilation may be necessary.

6. **Training and Technical Expertise**

Repairing a KWM-1 requires specialized knowledge of tube electronics, RF circuits, and broadcast systems. Many modern technicians lack experience with analog broadcast equipment, increasing the risk of improper repairs or further damage.

7. **Reliability and Longevity Uncertainty**

Even if the radio is functional now, its reliability over time is uncertain. Aging components (e.g., electrolytic capacitors, transformers) are prone to failure, and the lack of modern redundancy (e.g., backup power or automated failover) could lead to downtime.

8. **Depreciation Risk**

Unlike newer equipment, the KWM-1 s value may decline over time due to obsolescence. If the radio is not restored to perfect working condition, it may become harder to sell or trade in later.

9. **Potential for Hidden Damage**

- Burnt components in the power amplifier or modulator.

- Corrosion in critical connections (e.g., coax cables, RF ports).

- Mechanical failures in cooling fans or transformers.

These issues could lead to costly surprises during repair.

10. **Limited Manufacturer Support**

Rockwell Collins no longer actively supports the KWM-1, meaning there is no warranty, official service network, or guaranteed parts availability. Any repairs would be at the buyer s risk.

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### **Conclusion**

- The radio is in **good structural condition** and requires only **minor repairs** (e.g., tube replacements, capacitor upgrades).

- You have **access to skilled technicians** familiar with analog broadcast equipment.

- The **cost of repair is justified** by the radio s expected lifespan and value in its current application.

- You are prepared for **potential long-term maintenance** and lack of modern features.

However, if the radio is **severely degraded, lacks critical parts, or requires extensive modifications to meet modern standards**, the risks (time, cost, and reliability) may outweigh the benefits. In such cases, investing in a **new or refurbished high-power broadcast radio** (e.g., from Nautel, Harris, or Comrex) could be a more future-proof solution.

---

### **Recommendation**

1. **Inspect Thoroughly Before Purchase**

- Verify the radio s **power output**, **tuning stability**, and **absence of burnt components**.

- Check for **corrosion, loose connections, or damaged tubes**.

- Request a **load test** or **signal analysis** to confirm performance.

- Consult a **broadcast equipment specialist** to assess the feasibility of repair.

2. **Budget for Full Restoration**

- If purchasing as-is, account for **at least 20 50% of the purchase price** for repairs, parts, and labor.

- Prioritize **critical components** (e.g., power amplifier, modulator) over cosmetic fixes.

3. **Consider Alternatives**

- **Refurbished new radios** (e.g., Nautel NX-1000, Harris XR-1000).

- **Digital broadcast solutions** (e.g., HD Radio, DAB ) if transitioning to modern formats.

- **Leasing or renting** equipment for short-term needs.

4. **Document the Process**

- Keep detailed records of repairs, parts used, and any modifications. This will help with future troubleshooting or resale.

5. **Evaluate Long-Term Viability**

- Ask whether the radio aligns with **future broadcast trends** (e.g., digital migration, automation).

- If the facility plans to **upgrade infrastructure soon**, the KWM-1 may become obsolete quickly.

The KWM-1 is a **strong candidate for repair if the unit is sound and the investment in restoration is justified**. However, buyers should approach the purchase with **realistic expectations** about repair costs, reliability, and long-term usability. For most modern broadcast applications, a **new or refurbished radio** may offer better performance, support, and longevity. If you proceed with the KWM-1, prioritize **quality inspection, skilled labor, and a clear repair plan** to maximize its potential.

Details:

One is AS-IS but complete, the other has a few parts missing. No combined shipping discount is available on FREE Shipping items. These are from Collins Radio Cedar Rapids. Collins Radio Company, KWM-1 70K-1 PTO/VFO.

Includes a 5749 Tube.

part #: 522087300 price

• $18.15

specifications hamamateuradio:

• brand: Rockwell Collins Radio
• mpn: 522-0873-00
• model: 70k-1
• band: Hf
• number of channels: Pto
• type: Pto Vfo
• compatible product: Receiver-transmitter, Collins Kwm-1
• frequency range: 3.455 To 3.545mhz
• band type: Mono Band
• color: Silver
• supported modes: Cw, Ssb
• country of origin: United States

returns hamamateuRadio:

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

payments hamamateuRadio:

• other
• wallet: Google-pay
• credit card: Visa

offer hamamateuRadio:

• availability: In Stock
• options: Ship-to-home
• started: February 19, 2026
• sold: 0
• quantity: 1

general hamamateuRadio:

• Radio Communication > Ham, Amateur Radio > Ham Radio Transceivers
• condition: For parts or not working

shipping hamamateuRadio:

• carrier: USPS
• class: Standard, Expedited
• cost: $11.15
• transit: 4-7 Days
• service: USPS Ground Advantage, USPS Priority Mail
• type: Calculated

seller hamamateuRadio:

• # reviews: 6114
• city: Anamosa, Iowa
• rating: 100.0%

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