ALARM SAT Ham Radio Clock Timer Links Dialers AS/CTM-24

( Brand: Alarm Sat ), ( Manufacturer Part Number: CTM-24 ), ( Model: AS/CTM-24 ), ( Type: Clock Timer ), ( Country Of Origin: United States )

Review ALARM SAT Ham Radio As/ctm-24 Clock Timer From Links And Dialers

The **CTM-24 Alarm Clock Timer for Ham Radio AS/CTM-24 (1983)** is a meticulously crafted, vintage timekeeping device designed to serve both the practical needs of amateur radio operators and the precision demands of clock-controlled dialers. Engineered in the early 1980s, this analog marvel combines the reliability of a mechanical timing mechanism with the versatility of a programmable alarm, making it an indispensable tool for those who rely on exact timing for radio transmissions, contest operations, or automated dialer systems. The CTM-24 features a robust, dial-backed clock face with clearly marked hours and minutes, allowing for effortless manual adjustments while maintaining its self-winding or battery-powered functionality. Its most distinctive attribute is the integrated alarm timer, which can be set to activate at precise intervals ideal for scheduling automatic transmissions, monitoring contest deadlines, or coordinating multi-station operations. The unit s sturdy metal construction and durable dials ensure longevity, while its compact yet functional design allows it to be mounted on a desk, shelf, or even integrated into a radio shack setup. Whether used as a standalone clock or as part of a larger automated system, the CTM-24 exemplifies the precision engineering of its era, offering a blend of simplicity and sophistication that remains relevant for modern ham radio enthusiasts seeking both nostalgia and functionality. Its timeless appeal lies in its ability to bridge the gap between vintage reliability and contemporary communication needs, making it a sought-after piece for collectors and operators alike.

The **CTM-24 Ham Radio Alarm Clock Timer (1983)** is a vintage electronic device designed for amateur radio operators to automate keying signals, control relays, or trigger other functions via its dialers. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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### **Pros of buying a CTM-24**

1. **Functionality for Ham Radio Purposes**

- **Automated Morse code keying** (via its built-in dialers, which can send pre-programmed sequences).

- **Relay control** for remote stations, repeaters, or beacon systems.

- **Timed operations**, such as scheduling transmissions or activating auxiliary equipment.

It was widely used in the 1980s and 1990s for these tasks, and while modern alternatives exist, the CTM-24 remains a niche but functional tool for enthusiasts.

2. **Reliability and Durability**

As a vintage analog device, the CTM-24 is built with solid-state components and a robust chassis. Many units from this era have lasted decades with minimal maintenance, assuming they were well-preserved. If the unit is in good condition, it can serve as a reliable workhorse for low-complexity automation.

3. **Collectibility and Nostalgia**

For ham radio operators or electronics collectors, the CTM-24 holds historical significance. It represents a specific era of radio technology and may appeal to those who appreciate vintage gear. Some users enjoy restoring or modifying such devices as a hobby.

4. **Compatibility with Older Systems**

If you operate or restore older radio equipment, the CTM-24 can interface with analog relays, keyers, or transmitters that lack modern digital controls. It bridges the gap between vintage and contemporary setups in certain contexts.

5. **Low Power Consumption**

The device is designed to run off standard household power (likely 110V or 220V, depending on the model) and does not require significant energy, making it cost-effective to operate.

6. **No Dependence on Modern Electronics**

Unlike modern digital keyers or software-controlled solutions, the CTM-24 does not rely on computers or internet connectivity. This can be advantageous in environments where such dependencies are undesirable (e.g., emergency communications, remote locations, or EMP-resistant setups).

7. **Potential for Modification**

Skilled electronics hobbyists may find opportunities to repurpose or upgrade the CTM-24. For example, it could be adapted for non-ham uses like automated lighting, garden timers, or even as a teaching tool for electronics.

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### **Cons of buying a CTM-24**

1. **Outdated Technology**

The CTM-24 relies on analog circuitry and mechanical dialers, which are less precise and flexible compared to modern digital alternatives. Modern keyers and automation software offer far greater control, programmability, and ease of use.

2. **Limited Features**

- **Programmable memory** for storing complex sequences (modern keyers can store hundreds of messages).

- **USB or serial connectivity** for integration with computers or other digital systems.

- **Touchscreen or intuitive interfaces** (the CTM-24 uses physical dials and switches, which can be cumbersome).

- **Built-in diagnostics or error reporting** (troubleshooting may require deeper technical knowledge).

3. **Maintenance and Repairs**

Finding replacement parts or skilled technicians familiar with the CTM-24 can be difficult. Analog components may degrade over time, and soldering or replacing ICs or capacitors could be necessary. If the unit is damaged, repairs may be costly or impractical.

4. **Accuracy and Drift**

Analog timers and oscillators are prone to drift over time, especially if exposed to temperature fluctuations or power supply variations. This can lead to inaccuracies in timing or keying, which may be unacceptable for precise operations like contesting or automated beacon transmissions.

5. **Limited Output Options**

The CTM-24 s outputs are likely designed for specific applications (e.g., relay control, Morse keying). Adapting it for modern uses (e.g., interfacing with a Raspberry Pi or Arduino) would require significant modification and may not be straightforward.

6. **No Software or Firmware Updates**

Unlike modern devices, the CTM-24 cannot be updated or improved with new firmware. Any limitations or bugs are permanent unless you physically alter the hardware.

7. **Potential for Obsolescence**

While the CTM-24 may work fine for basic tasks, it is not future-proof. As ham radio evolves toward digital modes (e.g., FT8, PSK31) and software-defined radio (SDR), the need for such analog automation tools diminishes. Investing in a modern alternative might be more practical long-term.

8. **Cost of Acquisition and Condition**

Vintage electronics like the CTM-24 can be expensive if they are rare or in good condition. Conversely, units in poor condition may require extensive restoration, adding to the cost. Buying used also carries the risk of hidden defects (e.g., faulty capacitors, corroded contacts).

9. **Learning Curve**

Operating the CTM-24 may require familiarity with analog electronics and older ham radio practices. Newer operators accustomed to digital interfaces might find it less intuitive.

10. **Ethical and Practical Concerns**

- **Legality**: Ensure the unit is not part of a restricted or illegal system (e.g., unauthorized repeaters or automated transmissions).

- **Environmental Impact**: Vintage electronics may contain hazardous materials (e.g., lead in solder, CRT tubes in older displays), though the CTM-24 itself is likely safe. Proper disposal or recycling should be considered if the unit is no longer usable.

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### **Conclusion**

The **CTM-24 Ham Radio Alarm Clock Timer** is a fascinating piece of ham radio history with practical applications for specific use cases. It excels in scenarios where simplicity, reliability, and analog automation are prioritized over modern flexibility. However, for most contemporary ham radio operators, the limitations in programmability, accuracy, and compatibility with current technology make it a less ideal choice compared to modern digital keyers or software solutions.

- Enthusiasts who appreciate vintage electronics and enjoy restoring or modifying old gear.

- Operators working with legacy systems where analog automation is necessary.

- Collectors or those who find aesthetic or nostalgic value in the device.

- Low-budget, low-complexity automation tasks where modern alternatives are overkill.

For everyone else, especially those involved in modern digital modes, contesting, or automated repeaters, investing in a modern digital keyer (e.g., K3NG s Keyer, Elecraft K3, or a Raspberry Pi-based solution) would be far more practical and future-proof.

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### **Recommendation**

- You are a collector or enjoy tinkering with vintage electronics.

- You have a specific need for analog automation in a legacy setup (e.g., restoring an old repeater or beacon).

- You are on a tight budget and can accept its limitations.

- You plan to use it as a teaching tool to learn about analog circuits.

- You need precise, programmable, or modern-compatible automation.

- You are new to ham radio and prefer user-friendly digital tools.

- You require long-term reliability without potential maintenance issues.

- You are looking for a cost-effective solution for contemporary digital modes.

- **Digital Keyers**: Devices like the **K3NG s Keyer** or **Elecraft K3** offer modern features with better accuracy and programmability.

- **Software-Defined Keyers**: Programs like **Fldigi** or **Morse Trainer Pro** can run on a computer or Raspberry Pi for flexible automation.

- **Arduino/Raspberry Pi Solutions**: DIY projects can create custom automation scripts for ham radio applications.

- **Modern Ham Radio Software**: Many contemporary radios (e.g., Yaesu, Icom, FlexRadio) include built-in keying and automation features.

In summary, the CTM-24 is a niche tool with charm and utility for a specific audience, but it is not a practical choice for most modern ham radio operators. Weigh its pros and cons carefully against your needs before purchasing.

Details:

Size about 5 x 4 inches. Vintage, HAM RADIO AS/CTM-24 Clock Timer from 1983 timer for Radio Links and Dialers, comes with 2 pages of original info, runs off 6 to 12 volts , Sold ASIS experimentation or Collecting.

part #: ctm24 prices

• $15.00-$40.00

specifications hamamateuradio:

• brand: Alarm Sat
• mpn: Ctm-24
• model: As/ctm-24
• type: Clock Timer
• country of origin: United States

shipping hamamateuradio:

• cost: $9.00
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• type: Fixed

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general hamamateuradio:

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

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• # reviews: 5226
• city: Jupiter, Florida

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• started: April 8, 2026

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