Yes, you could transmit with it, but straight keys are so cheap why not just buy another one.

DOWNLOAD THE APP

WE SOURCE ITEMS FROM

UAE
UK
India
USA
Japan

Customer Services

About Us

Customer Support

Desert Online General Trading LLC

Dubai, United Arab Emirates

MFJ Enterprises Original MFJ-557 Deluxe Morse Code Practice Oscillator Straight Key w/Volume Control by MFJ

MFJ Enterprises Original MFJ-557 Deluxe Morse Code Practice Oscillator Straight Key w/Volume Control by MFJ

Q: It says practice machine; can it be used in real life applications? If not would you recommend a unit that would?

The key can be removed from the practice oscillator base, and hooked up to most CW transceiver / transmitters for real world applications after you are done using it for audible practice .

Q: can you hook paddles up instead of the straight key ?

You can not. Paddles need additional intelligence and an additional circuit that will send dots or dashes when you move the paddles right or left. This is essentially like the buzzer on a door...as long as you press it buzzes, when you stop it stops.

Q: can you wire this to a radio

Dear Writer, 10x 4 msg. You can do if your radio has MORSE key wire's input (not morse key speaker input). Simply un-screw two wires which connects to morse key from inbuilt MFJ device then connect radio's morse key wires. Have a g8t day. 73. Mayank Gupta (VU3MFT)

Product ID: 739824039

Secure Transaction

Details

Brand
MFJ
Power Source
Battery
Style
Modern
Special Feature
Oscillating
Mounting Type
Tabletop Mount
Number of Speeds
3

⚡Precise Morse code signal output

📏Compact 21.6 x 9.5 x 5.7 cm size

🔊Adjustable volume control

Frequently Bought Together

MFJ Enterprises Original MFJ-557 Deluxe Morse Code Practice Oscillator Straight Key w/Volume Control

Learn Morse Code - Easy Tutorial Workbook for Beginners: The Easiest Way to Study Morse - LISTEN to Morse Signals with QR Codes! Morse Practice Book for Kids Ages 8+ and Adults

Morse Code Operating for Amateur Radio – Your Guide to Ham Radio’s First Language

Description

🔑 Unlock your inner code master with MFJ-557!

DURABLE BUILD QUALITY - Engineered by MFJ Enterprises for long-lasting performance
MASTER YOUR MORSE CODE - Deluxe straight key design for authentic practice sessions
PORTABLE LIGHTWEIGHT - Compact 571g build fits perfectly on any desk or field setup
CUSTOMIZABLE SOUND LEVELS - Volume control lets you tailor your signal strength
PERFECT FOR PROFESSIONALS HOBBYISTS - Ideal for managers and tech-savvy millennials seeking skill mastery

The MFJ-557 Deluxe Morse Code Practice Oscillator is a compact, lightweight straight key with adjustable volume control, designed by MFJ Enterprises for precise and authentic Morse code training. Perfect for professionals and enthusiasts aiming to sharpen their communication skills.

Specifications

Model Number	MFJ-557
Batteries Included	No
Product Dimensions	21.59 x 9.53 x 5.72 cm; 571.53 g

Have a Question? See What Others Asked

It says practice machine; can it be used in real life applications? If not would you recommend a unit that would?

can you hook paddles up instead of the straight key ?

Can this transmit

can you wire this to a radio

Reviews

櫛**治

電鍵の鉄板がプレス打抜き跡が有り安っぽい

電鍵は自作でしたので、今年見た目が良かったので購入してみました、が電源がなかったので別に購入する事になりました、さて、使った感想ですが、発信音は変調出来るのでとても良いです、電鍵は思っていたより安っぽくて、自分の電鍵を付けて使用してます、

10.06.2020

Common Questions

Are the products genuine and authentic?+

Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

How long does delivery take and is it reliable?+

Delivery times vary by destination country, typically ranging from 3-9 business days. Each order is fully trackable through our system. We handle all customs clearance and use reliable courier partners for last-mile delivery. You'll receive regular updates about your order status via email and our app.

What is Desertcart? Is it safe to order from?+

Desertcart is an international e-commerce platform operating since 2014. We securely process thousands of orders globally each day. Every product goes through our quality verification process before delivery, and we provide end-to-end order tracking, 24/7 customer support, and a comprehensive returns policy to ensure a safe shopping experience.

How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Shop Global, Save with Desertcart

Value for Money

Competitive prices on a vast range of products

Shop Globally

Serving millions of shoppers across more than 100 countries

Enhanced Protection

Trusted payment options loved by worldwide shoppers

Customer Assurance

Trusted payment options loved by worldwide shoppers.

Desertcart App

Shop on the go, anytime, anywhere.

Trustpilot

TrustScore 4.5 | 7,300+ reviews