
( Brand: Federal Telephone & Telegraph ), ( Manufacturer Part Number: MRC-55 ), ( Model: AN/GRC-14 ), ( Part Type: Radio Transmitter ), ( Supported Modes: Rtty // Teletype ), ( Frequency Band S : Hf ), ( Country/region Of Manufacture: United States )
The MRC-55 GRC-14 Marine Radio HF T631 Corps Div Synthesized Federal Telephone Telegraph Transmitter is a high-performance communication device designed specifically for marine applications. This radio transmitter is part of the U.S. military's arsenal and is renowned for its reliability and durability.
The MRC-55 GRC-14 features a synthesized frequency generator, allowing for precise tuning of frequencies within the HF band. This feature ensures clear and reliable communication, even in the challenging marine environment. The transmitter is equipped with a robust power amplifier, capable of delivering up to 150 watts of output power, ensuring that your messages are heard loud and clear, even over long distances.
The radio is housed in a rugged, waterproof and dust-resistant enclosure, making it ideal for use in harsh marine conditions. The enclosure is designed to withstand the harsh marine environment, including exposure to saltwater, sun, and wind. The radio also features a large, easy-to-read display, making it easy to monitor frequency, signal strength, and other vital information.
The MRC-55 GRC-14 Marine Radio HF T631 Corps Div Synthesized Federal Telephone Telegraph Transmitter is also equipped with a sophisticated antenna system, allowing for the maximum range and reliability of communication. The antenna system can be easily adjusted to optimize performance in different marine environments.
In summary, the MRC-55 GRC-14 Marine Radio HF T631 Corps Div Synthesized Federal Telephone Telegraph Transmitter is a high-performance, rugged and reliable communication device designed for use in the challenging marine environment. Its synthesized frequency generator, robust power amplifier, waterproof and dust-resistant enclosure, large easy-to-read display, and sophisticated antenna system make it an ideal choice for any marine communication needs.
Pros of buying a MRC-55 GRC-14 Marine Radio HF T631 Corps Div Synthesized Federal Telephone Telegraph Transmitter US:1. Reliability: This marine radio is known for its reliability and durability, making it an ideal choice for long-term use at sea.
2. Synthesized VFO: The synthesized VFO allows for quick and precise frequency tuning, which is crucial for effective communication at sea.
3. Wideband Coverage: The MRC-55 GRC-14 has a wideband coverage, ensuring that you can communicate with other vessels and shore stations over a broad range of frequencies.
4. Built-in Antenna Tuner: The built-in antenna tuner enables optimal performance of the antenna, ensuring that you get the best possible signal strength.
5. Military Grade Construction: The military-grade construction of this marine radio ensures that it can withstand harsh marine environments, making it a reliable choice for use on boats and ships.
Cons of buying a MRC-55 GRC-14 Marine Radio HF T631 Corps Div Synthesized Federal Telephone Telegraph Transmitter US:1. High Price: The MRC-55 GRC-14 is a high-end marine radio, and its price reflects its advanced features and military-grade construction.
2. Complexity: The MRC-55 GRC-14 has many advanced features, which can make it complex to use for those who are not familiar with marine radios.
3. Weight: The MRC-55 GRC-14 is a heavy marine radio, which can make it difficult to carry around or mount on small boats.
Conclusion:The MRC-55 GRC-14 Marine Radio HF T631 Corps Div Synthesized Federal Telephone Telegraph Transmitter US is a high-quality marine radio with advanced features and military-grade construction. It is reliable, durable, and has wideband coverage and a built-in antenna tuner. However, it is also expensive and complex to use, and its weight can make it difficult to carry around or mount on small boats.
Recommendation:If you are looking for a high-end, reliable marine radio with advanced features, the MRC-55 GRC-14 is an excellent choice. However, if you are on a budget or prefer a more user-friendly marine radio, there are other options available that may better meet your needs. It is important to carefully consider your needs and budget before making a purchase decision.
Frequency accuracy and stability are determined by a digitally set synthesizer, which is used to control the frequency of an adjustable frequency oscillator CFO. The output circuit normally energizes the jeep whip antenna but may optionally be connected to a 50 ohm coaxial line or to a long wire antenna. And a vacuum dielectric adjustable capacitor.
As supplied to the USMC, this was called the mrc 55 system. The 631 is an hf transmitter for am, cw, MC and teletype.
Molded glass dielectric capacitors, precision ceramic capacitors. Tuning of the radio frequency amplifier circuits and antenna loading are accomplished automatically.
The output of the CFO drives the automatically tuned antenna matching circuit. This comes with the grc 14 power supply and two r 808 receivers. The main power switch selects the type of power source.
6 kilovolt amperes.
Frequency increments in 100 cycle per second steps are available in the stabilized condition. Built by Federal Telephone Telegraph a division of. Twill provide continuous wave, radiotelephone, frequency shift keyed or simultaneous Telephone and frequency shift keyed signals. In the event of failure of the synthesizer circuits, the variable frequency oscillator operates as a standard master oscillator.
This was a good thing since it preserved the panels and protected the units from any falling sediment. The front edges are abraded because they were stored upside down.
I do not have the mrc 55 shock mount or interconnecting cables. Condition unknown electrical condition and untested. The r808 has a built in audit tty converter and the grc 14 transmitter has built in Fisk keyed.
This sale includes a original full manual set 3 inches thick, a parts list thick and several boxes of spare parts. These may be available from other owners or from normal surplus channels. Fair radio may be able to help.
The transmitter power supply are complete and unmolested so far as I know. At least their weight condition testifies to this. Continued power supply again from a published electronics communications review the power supply designated pp 1711 grc an interesting feature of the radio frequency amplifier is the employment of motor driven adjustable inductance's.
This stage is high level modulated by two 4x250ftetrode tubes for Telephone operation. Transmitter from a published electronics communications review the transmitter is rated at 100 watts of carrier power output over the frequency range of 2 to 30 MHz. These were always stored in doors and usually in insulated locations.
The variable frequency oscillator is manually adjusted to the desired frequency by means of a synchronization indicator that shows when the automatic frequency control is acting on the oscillator frequency. The power output stage utilizes a 4x250f tutored. The unit is designed to operate from a primary power source of either 28 volts at 40 amperes of direct current or from a 110 vac single phase 60 cycle per second alternating current supply at for offer sale a 631 grc 14 multi mode synthesized transmitter with a master oscillator.
The actual units look much better than the pictures show. I do not know the last time this was powered up and I do not have the interconnecting cables.
Note the mrc 55 designation included the military jeep, shock mount, antenna and all accessories.