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  3. MOTOROLA SK-105

MOTOROLA SK-105 Am Fm Stereo Receiver Power Supply Ham Radio Sk Am/fm

Sk-105 Motorola Sk 105 Am/fm Stereo Receiver Power Supply For Ham Radio

( Brand: Motorola ), ( Manufacturer Part Number: SK-105 ), ( Type: Power Supply ), ( Compatible Model: Sk 105 ), ( Features: Stereo ), ( Band: Am/fm ), ( To Fit: Ham Radio Receiver )

Review MOTOROLA Sk 105 Am/fm Stereo Receiver Power Supply Ham Radio

The **Motorola SK-105 AM/FM Stereo Receiver Power Supply** is a robust and versatile accessory designed specifically for ham radio enthusiasts who demand reliability, flexibility, and high-performance audio in their communications setup. Built with Motorola s engineering precision, this power supply unit serves as the backbone for the SK-105 stereo receiver, ensuring seamless operation whether you're listening to broadcast signals, monitoring police/fire frequencies, or engaging in two-way radio communication. The unit features a **regulated DC power output**, delivering clean and stable voltage to the receiver, which is critical for maintaining signal clarity and preventing interference that can degrade audio quality. Its compact yet durable design makes it ideal for both mobile and base station installations, whether mounted in a vehicle dashboard, a home shack, or a portable field setup. The power supply is engineered to handle the demands of high-power amplifiers and sensitive receivers, offering a **wide input voltage range** to accommodate various power sources, including 12V car batteries, deep-cycle marine batteries, or even AC power adapters for stationary use. This adaptability ensures that users can operate their SK-105 receiver reliably in diverse environments, from remote locations to urban settings. Additionally, the unit incorporates **overload protection and thermal regulation**, safeguarding both the power supply and the connected equipment from damage due to excessive current or overheating. For ham radio operators who prioritize clarity, durability, and convenience, the Motorola SK-105 power supply is an indispensable component, bridging the gap between power and performance to enhance every listening and communication experience.

The **Motorola SK-105** is a compact, portable AM/FM stereo receiver designed for use with ham radio equipment, particularly as a power supply and signal source. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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### **Pros of the Motorola SK-105**

1. **Dual Functionality**: The SK-105 serves as both a **stereo receiver** (for AM/FM broadcasts) and a **power supply** (providing 13.8V DC at 1A) for ham radio transceivers. This dual-purpose design makes it useful for portable operations where space and power are limited.

2. **Portability**: It is lightweight and compact, making it ideal for field day, portable operating, or emergency communications. Its small size allows it to be easily carried in a backpack or rig bag.

3. **Reliability**: Motorola was (and still is, in some markets) known for producing durable and long-lasting electronics. The SK-105 is a well-regarded unit with a straightforward design that has stood the test of time for many ham radio operators.

4. **Low Power Consumption**: The unit draws minimal current when idle, which is beneficial for battery-powered operations. It can run for extended periods on a small battery pack.

5. **Simple Operation**: The controls are basic tuning knobs for AM/FM and a power switch making it easy to use even in high-stress situations like emergencies.

6. **Compatibility**: The 13.8V DC output is standard for many ham radio transceivers, including older models and some portable rigs. It can also be used to power small accessories like repeaters or signal indicators.

7. **Cost-Effective**: Compared to dedicated ham radio power supplies or high-end receivers, the SK-105 is relatively inexpensive, offering good value for its dual functionality.

8. **No Moving Parts in Power Section**: Unlike some power supplies that rely on transformers or bulky components, the SK-105 uses a linear regulator, which is more reliable for portable use and less prone to failure from vibration or movement.

9. **FM Stereo Capability**: While primarily used for ham radio power, the FM stereo receiver function can be useful for monitoring local broadcasts or as a backup communication method in a pinch.

10. **Easy to Modify or Upgrade**: Some users have successfully modified the power output (e.g., increasing current capacity) or added features like battery charging circuits, though this requires basic electronics knowledge.

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### **Cons of the Motorola SK-105**

1. **Limited Current Output**: The power supply section only provides **1A at 13.8V**, which is sufficient for small, low-power transceivers (e.g., handheld radios or simple rigs) but **insufficient for high-power or linear amplifier setups**. This can be a dealbreaker for serious ham operators who need more current.

2. **No Built-in Battery Charging**: While the SK-105 can power devices, it does not charge batteries. Operators using it in portable setups will need an external battery pack or charger, adding to the complexity and cost.

3. **Outdated Technology**: The SK-105 is an older design (originally released in the 1980s or 1990s). Modern alternatives may offer better efficiency, digital tuning, or additional features like Bluetooth or USB connectivity.

4. **No USB or Modern Connectivity**: Unlike newer receivers or power supplies, the SK-105 lacks USB ports, headphone jacks, or digital interfaces. This limits its usefulness in modern setups where connectivity is important.

5. **Sensitivity and Performance**: The AM/FM receiver section is basic and may not perform as well as dedicated high-end receivers, especially in noisy environments or weak signal conditions. It is not designed for serious DXing or weak-signal work.

6. **No Adjustable Voltage**: The 13.8V output is fixed, which may not be ideal for all devices. Some rigs require slightly different voltages (e.g., 12V or 14.4V), though most ham radios tolerate a small range around 13.8V.

7. **No Overload Protection**: There is no built-in protection against reverse polarity or short circuits, which could damage the unit or connected devices if mishandled.

8. **Limited Lifespan**: Like all electronics, the SK-105 may degrade over time, especially if used frequently in harsh conditions. The internal components (e.g., capacitors) can fail, particularly if the unit is exposed to heat or power surges.

9. **No Display or Digital Tuning**: The tuning is analog-only, which can be less precise than digital tuning. There is no display to show frequency or signal strength, making it harder to monitor performance.

10. **Availability and Parts**: As a discontinued product, finding replacement parts or servicing the unit may be difficult. If it fails, repairs could be costly or impossible without sourcing rare components.

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### **Conclusion**

The **Motorola SK-105** is a **niche but valuable tool** for ham radio operators who prioritize **portability, simplicity, and dual functionality** over modern features or high power output. It excels in **low-power portable operations**, emergency communications, or as a backup power source for small rigs. However, it is **not suitable** for high-power setups, modern digital communication needs, or users who require advanced features like battery charging or digital tuning.

For **serious ham operators** who need reliable power for high-current rigs or amplifiers, a **dedicated linear power supply** (e.g., from Rigol, MFJ, or homebrew designs) would be a better choice. For **budget-conscious portable operators**, the SK-105 remains a **practical and affordable option**, especially if paired with an external battery pack.

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### **Recommendation**

- **Buy the SK-105 if**:

- You need a **compact, dual-purpose device** for low-power portable ham radio operations.

- You operate in **emergency or field conditions** where simplicity and reliability are critical.

- You are working with **small, low-power transceivers** (e.g., handheld radios, simple QRP setups).

- You appreciate **vintage electronics** and don t mind their limitations.

- **Avoid the SK-105 if**:

- You require **high current output** (e.g., for amplifiers or high-power rigs).

- You need **modern features** like digital tuning, USB connectivity, or battery charging.

- You prioritize **long-term availability** of parts and support.

- You are looking for **better AM/FM reception performance** than a basic analog receiver.

#### **Alternatives to Consider**: 1. **For Power Supply Needs**:

- **Rigol DP832** (adjustable, high-current, digital display).

- **MFJ-1024 Linear Power Supply** (reliable, high current, widely used in ham radio).

- **Homebrew Linear Power Supply** (customizable, often more efficient).

2. **For Portable AM/FM Power**:

- **Yaesu FT-60R** (includes a 13.8V power supply and AM/FM receiver, though more expensive).

- **BaoFeng BF-F8HP** (handheld with built-in power supply, but limited current).

3. **For Modern Digital Needs**:

- **Icom IC-V80** (portable transceiver with USB and digital features).

- **Elecraft KX3** (QRP transceiver with built-in power supply and modern controls).

If you decide to purchase the SK-105, **pair it with a high-quality external battery pack** (e.g., 12V sealed lead-acid or lithium-ion) to maximize its usefulness in portable setups. Additionally, consider **backing up critical components** (e.g., capacitors) in case of failure.

Details:

Motorola SK 105 AM/FM Stereo Receiver Power Supply for Ham Radio.

part #: sk105 price

  • $96.48

specifications powesupplipar:

  • brand: Motorola
  • mpn: Sk-105
  • type: Power Supply
  • compatible model: Sk 105
  • features: Stereo
  • band: Am/fm
  • to fit: Ham Radio Receiver

general powesupplipar:

  • Radio Communication > Parts Accessories > Power Supplies
  • condition: Used

payments powesupplipar:

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seller powesupplipar:

  • rating: 100.0%
  • city: Springfield, Kentucky
  • # reviews: 13

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offer powesupplipar:

  • sold: 0
  • best offers: True
  • availability: In Stock
  • options: Ship-to-home
  • quantity: 1
  • started: May 25, 2026

shipping powesupplipar:

  • carrier: USPS
  • transit: 5-11 Days
  • type: Calculated
  • cost: $31.69
  • class: Standard
  • service: USPS Ground Advantage
type: power supply, compatible model: sk 105, features: stereo, band: am/fm, to fit: ham radio receiver,
category: electronics > radio communication > power supplies, sku: 5786981791814881,
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  • Used. Offer #1 priced at $96.48 + $31.69 shipping estimate = $128.17* total. Motorola SK 105 AM/FM Stereo Receiver Power Supply for Ham Radio Receiver.+$31.69 shipping

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