WACOM WP-405 Cavity Rf Bandpass Filter Tunable Telewave Nos 52.850

( Brand: Wacom ), ( Manufacturer Part Number: WP-405 ), ( Unit Type: Unit ), ( Connectivity: Uhf ), ( Compatible Brand: Universal ), ( Type: Filter ), ( Country Of Origin: United States )

Review WACOM Cavity Rf Bandpass Filter Tunable Mhz Telewave Type Nos

The **Wacom WP-405 Cavity RF Bandpass Filter (Tunable, 52.850 MHz, TeleWave NOS)** is a high-performance, precision-engineered RF component designed for demanding applications in telecommunications, satellite communications, and radar systems. Manufactured by Wacom, a trusted name in microwave and millimeter-wave technology, this cavity filter exemplifies reliability and engineering excellence, making it an ideal choice for engineers seeking uncompromising signal integrity. The WP-405 is a tunable bandpass filter, allowing operators to fine-tune its center frequency within a specified range, ensuring optimal performance across varying operational conditions. Built around a high-Q cavity resonator structure, this filter delivers exceptional selectivity and minimal insertion loss, making it well-suited for applications requiring narrow bandwidths and high signal purity. Operating at a nominal frequency of **52.850 MHz**, the WP-405 is particularly well-suited for legacy and modern telecommunication systems, including amateur radio, military communications, and specialized RF test equipment. The filter s robust construction, featuring high-purity copper or silver-plated cavities, ensures durability and resistance to thermal fluctuations, while its compact yet sturdy design allows for seamless integration into existing RF architectures. As a **No-Service-Obsolete (NOS)** unit, this filter retains its original factory specifications and performance characteristics, offering a cost-effective alternative to newer models without sacrificing quality. Whether used in signal processing chains, frequency synthesis, or as part of a selective receiver system, the Wacom WP-405 delivers consistent, high-fidelity filtering with minimal phase distortion, making it a dependable asset for professionals who demand precision in their RF applications.

**Pros and Cons of buying a Wacom WP-405 Cavity RF Bandpass Filter (Tunable, 52.850 MHz, Telewave NOS)**

### **Pros**

1. **High-Quality NOS (New Old Stock) Component**

The filter is described as NOS, meaning it is a pre-owned but fully functional and well-preserved part from a reputable manufacturer like Telewave. NOS components often retain original specifications and reliability, avoiding the risk of degraded performance found in used or refurbished parts.

2. **Precision Tunability**

The tunable nature of the cavity filter allows for fine adjustments to match specific frequency requirements, which is useful in applications where exact bandwidth or center frequency alignment is critical. This flexibility can be particularly valuable in amateur radio, military communications, or specialized test equipment.

3. **Low Insertion Loss and High Selectivity**

Cavity filters like this one are known for their low insertion loss (minimal signal attenuation) and high selectivity (sharp roll-off), making them ideal for applications where signal integrity is paramount. This is especially important in RF systems where interference or signal distortion must be minimized.

4. **Durability and Reliability**

Telewave is a well-regarded manufacturer of RF components, and cavity filters are generally robust, built to withstand harsh environments. The WP-405 model, in particular, is designed for professional use, suggesting it is built to last with minimal maintenance requirements.

5. **Compatibility with Wacom Systems**

Since this filter is branded as a Wacom part, it is likely designed to integrate seamlessly with Wacom s line of RF equipment, such as amplifiers, transmitters, or test systems. This compatibility reduces the need for additional interfacing or modifications.

6. **Potential Cost Savings**

Purchasing NOS components can sometimes be more cost-effective than buying new, especially if the original manufacturer no longer produces the part. This can be advantageous for hobbyists or professionals working on tight budgets.

7. **Proven Performance in RF Applications**

Cavity filters are a mature technology with decades of proven reliability in applications ranging from military communications to satellite systems. The 52.850 MHz center frequency suggests it is suited for specific bands, such as amateur radio (e.g., 2-meter band) or other narrowband applications.

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### **Cons**

1. **Limited Availability and Lead Times**

NOS components, especially from niche manufacturers like Telewave, may not be readily available from standard suppliers. This could result in longer lead times or the need to source from specialized dealers, which may not always be convenient.

2. **Potential for Obsolescence**

While NOS implies the part is functional, the technology behind RF components evolves over time. If the filter is older, it may not support modern modulation schemes, digital signal processing, or higher power levels that newer components can handle. This could limit its usefulness in updated systems.

3. **No Warranty or Return Policy**

NOS parts are typically sold as-is, with no warranty or return options. If the filter fails or does not meet specifications upon receipt, there may be no recourse, which could be a risk for critical applications.

4. **Calibration and Tuning Challenges**

Tunable filters require precise calibration to ensure they perform as intended. If the filter is not properly tuned or if the user lacks the expertise to do so, it could result in suboptimal performance or even damage to the system it is integrated with.

5. **High Initial Cost Relative to New Alternatives**

While NOS parts can be cost-effective, the WP-405 may still be more expensive than newer, mass-produced alternatives that offer similar or improved performance. For example, modern surface-mount technology (SMT) filters might be cheaper and more compact, though they may lack the same level of tunability or power handling.

6. **Physical Size and Integration Constraints**

Cavity filters are generally larger and bulkier than their solid-state or SMT counterparts. This could pose challenges in space-constrained applications, such as portable or compact RF systems. The WP-405 may require additional mounting or shielding, adding complexity to the design.

7. **Dependence on Expertise for Installation**

Installing a cavity filter, especially in a high-power or critical system, often requires specialized knowledge of RF engineering. Improper installation such as incorrect grounding, improper tuning, or mismatched impedance could lead to performance issues, signal reflections, or even equipment damage.

8. **Potential for Degradation Over Time**

Even though the filter is NOS, prolonged storage or exposure to environmental factors (e.g., humidity, temperature fluctuations) could have subtly degraded its performance. While Telewave is reputable, there is always a risk that the part may not be in pristine condition despite its "new" status.

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### **Conclusion**

The **Wacom WP-405 Cavity RF Bandpass Filter (Tunable, 52.850 MHz, Telewave NOS)** is a high-quality, precision RF component well-suited for applications requiring narrowband selectivity, low insertion loss, and tunability. Its NOS status ensures reliability and original specifications, making it a strong choice for professionals or hobbyists working with legacy or specialized RF systems. The filter s compatibility with Wacom equipment and its proven track record in demanding environments further enhance its appeal.

However, the cons such as limited availability, lack of warranty, potential obsolescence, and the need for expert handling must be carefully considered. If you are working on a project where cost, space, or modern performance requirements are critical, newer alternatives might be more appropriate. That said, for applications where legacy compatibility, tunability, and high reliability are non-negotiable, this filter remains a compelling option.

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### **Recommendation**

- You are working with a system that specifically requires a tunable cavity filter at 52.850 MHz (e.g., amateur radio, military communications, or test equipment).

- You have access to the necessary expertise to properly tune and integrate the filter.

- You prioritize NOS reliability and are willing to accept the limitations of lead times and lack of warranty.

- Your application cannot accommodate newer, more compact alternatives due to performance or compatibility constraints.

- You need a cost-effective, mass-produced filter with modern features (e.g., higher power handling, digital tuning, or smaller form factor).

- Your project has strict space or weight constraints that cavity filters cannot meet.

- You require a warranty or return policy, as NOS parts typically come with none.

- You are unsure about the filter s condition or lack the tools to verify its performance before purchase.

For most modern RF projects, evaluating newer cavity filters or solid-state alternatives may be more practical. However, for enthusiasts or professionals maintaining legacy systems, the WP-405 remains a robust and capable choice. Always verify the filter s condition (e.g., through visual inspection or testing) and ensure it aligns with your system s requirements before purchasing.

Details:

Items may need a more in depth cleaning. I do a lot of business with them and they always have well cared for gear. Everything you see in the pictures is what included this lot. Please look at all pictures closely before purchasing.

Photos are the best. Not saying it won't need adjustments but, looks like a nice clean unit. I am not an operator and don't have the knowledge to fully test myself. I did purchase from a local operator.

part #: wp405 prices

• $130.00-$399.99

specifications hamamateuradio:

• brand: Wacom
• mpn: Wp-405
• unit type: Unit
• connectivity: Uhf
• compatible brand: Universal
• type: Filter
• country of origin: United States

offer hamamateuradio:

• started: March 31, 2026
• options: Ship-to-home
• sold: 0
• availability: In Stock
• quantity: 1
• best offers: True

payments hamamateuradio:

• other
• credit card: Mastercard
• wallet: Apple-pay

returns hamamateuradio:

• policy: No Returns

seller hamamateuradio:

• # reviews: 14478
• rating: 99.3%
• city: Federal Way, Washington

general hamamateuradio:

• Radio Communication > Ham, Amateur Radio > Other Ham Radio Equipment
• condition: Used

shipping hamamateuradio:

• class: Standard
• type: Fixed
• service: USPS Ground Advantage
• transit: 9-13 Days
• carrier: USPS
• cost: $199.99

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