MOTOROLA 2N4128 Power Npn Transistors Qrp Homebrew Up Watts Hf Uhf
( Brand: Motorola ), ( Model: 2N4128 ), ( Supported Modes: Am ), ( Frequency Band S : Hf )
Review MOTOROLA Power Npn Transistors Qty Qrp Homebrew Up Watts Output Hf Uhf
The 2N4128 Power NPN Transistors are a versatile and reliable choice for various applications, particularly in QRP (Quite Portable Radio) homebrew projects that require up to 24 watts of power output, covering the High Frequency (HF) and Ultra-High Frequency (UHF) bands. These transistors are compatible with Motorola and other similar radio systems.
The 2N4128 Power NPN Transistors are renowned for their high-current handling capabilities, with a maximum collector current of 1.8 Amperes, making them suitable for driving high-power amplifier stages in radio transmission systems. They operate efficiently within a collector-emitter voltage range of 0.2 volts to 45 volts, ensuring a wide margin of compatibility with various power supply configurations.
The transistors' base-emitter voltage (VBE) is typically around 0.7 volts, and their maximum power dissipation is 250 mW at a junction temperature of 25 degrees Celsius. These specifications make the 2N4128 a reliable choice for applications requiring a stable and robust power supply, such as radio transmitters and amplifiers.
The 2N4128 Power NPN Transistors are also known for their high-frequency performance, with a cutoff frequency (fT) of 400 MHz. This high-frequency capability allows the transistors to be used in applications that require fast switching and minimal phase shift, such as signal modulation and frequency shifting in radio systems.
In summary, the 2N4128 Power NPN Transistors are an excellent choice for QRP homebrew projects requiring up to 24 watts of power output in the HF and UHF bands. Their high-current handling, wide voltage range, stable VBE, and high-frequency performance make them reliable and versatile components for various radio transmission applications, including Motorola compatible systems.
Pros of buying 2N4128 power NPN transistors for a QRP (Quite Poorly Rated) homebrew radio project that aims to produce 24 watts of power for HF (High Frequency) and UHF (Ultra High Frequency) bands, using Motorola as a reference:
1. Inexpensive: 2N4128 transistors are generally affordable, making them an attractive option for budget-conscious hobbyists.
2. Widely Available: These transistors are commonly found in electronics stores and online retailers, ensuring easy availability.
3. Robust: 2N4128 transistors are known for their durability and reliability, especially in applications with moderate power levels.
Cons:1. Lower Power Rating: While 2N4128 transistors have a maximum collector-emitter voltage of 100V and a current rating of 800mA, they may not be the best choice for high-power applications like the one described.
2. Limited Gain: The lower gain of 2N4128 transistors may require additional components or stages to achieve the desired amplification.
3. Limited Bandwidth: These transistors may not provide sufficient bandwidth for HF and UHF applications, which may impact the radio's performance.
Ending Conclusion:While 2N4128 transistors can be a cost-effective choice for a lower-power QRP homebrew project, they may not be the best option for a high-power, multi-band radio like the one described. Depending on the specific design and operating requirements, a different NPN transistor with higher power and gain ratings, such as the 2N3904 or 2N3906, may be more suitable. For high-power applications, it is recommended to research and evaluate other transistors specifically designed for high-power and multi-band amplification.
Details:
Up for sale: quantity 5 - 2N4128 RF power amp, driver, silicon npn transistors with gold plated ribbon leads and stud.
They are and that is normal. Buyer satisfaction is my number one priority.
You are buying on exactly what is shown in the pictures. SDI spl transis retrain RF transistors good buying luck.
When feasible, combined shipping may be utilized. PDF the physical condition of this item is new excellent.
Local sale some items are concurrently offered for locally.
Use in applications from hf through 200 MHz vhf combined shipping - important. Domestic shipping: standard first class package this transistor is rated at 24 watts power output 175 MHz.
specifications hamamateuradio:
- brand: Motorola
- model: 2n4128
- supported modes: Am
- frequency band s : Hf
Payments hamamateuradio:
- PayPal
Returns hamamateuradio:
- policy: no returns
General hamamateuradio:
- in stock: Yes
- consumer electronics > radio communication electronics > ham amateur radio communication
- condition: New other see details
Offer hamamateuradio:
- Started: January 21, 2018, 12:27 pm
- bids: 0
- Sold: 0
- quantity: 1
- best offer: false
Shipping hamamateuradio:
- cost: $3.0
- handling: 1 days
- type: Flat
Seller hamamateuradio:
- city: Placerville, California
- zipcode: 95667
Ratings:
- Nice items AAA 01-12-18
- Perfectly as described. Very well packed. 100% positive experience. 01-08-18
- Thanks! Purchase of OldHeathkitParts has been mailed out. AAA 01-20-18
- Well packed and well very well done. 5 Stars 01-20-18
- Great service!!! Fast shipping!!!! 01-10-18
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