MFJ Enterprises MFJ-557 Morse Code Practice Oscillator

h-mandeals
(49)
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US $70.00
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Located in: San Francisco, California, United States
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Estimated between Thu, Jun 12 and Wed, Jun 18 to 94104
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eBay item number:405775110794
Last updated on May 19, 2025 13:54:18 PDTView all revisionsView all revisions

Item specifics

Condition
New: A brand-new, unused, unopened, undamaged item in its original packaging (where packaging is ...
Type
Oscillator
UPC
0702646177954
Compatible Brand
For Galaxy, For Drake, For Hallicrafters, For Ten-Tec, For Wouxun, For Elecraft, For Heathkit, For Realistic, For Icom, For Yaesu, For Ranger, Universal, For Kenwood, For Collins, For RadioShack
Brand
MFJ
Compatible Model
eBay US
Year Manufactured
Easy to use
Features
Built-In Headphone Jack, Volume controls
Item Weight
1.25 lbs

About this product

Product Information

The MFJ-557 is a Deluxe Morse Code Practice Oscillator straight key model developed by the MFJ Enterprises brand. It has a contact pushed to create and send the practice message, and it has dimensions of 3.75-inches by 2.75-inches, which makes it compact and easy to carry. The radio and communication device is handy in learning the coded language which is useful for sending short messages.

Product Identifiers

Brand
MFJ
GTIN
0702646177954
UPC
0702646177954
eBay Product ID (ePID)
1737650127

Product Key Features

Year Manufactured
Easy to use
Compatible Brand
For Galaxy, For Drake, For Hallicrafters, For Ten-Tec, For Wouxun, For Elecraft, For Heathkit, For Realistic, For Icom, For Yaesu, For Ranger, Universal, For Kenwood, For Collins, For RadioShack
Features
Built-In Headphone Jack, Volume controls
Compatible Model
eBay US

Dimensions

Height
2.25in
Width
3.75in
Item Weight
1.25 lbs

Item description from the seller

About this seller

h-mandeals

100% positive feedback•159 items sold

Joined Jun 2019
Usually responds within 24 hours
Seller's other itemsContact

Detailed seller ratings

Average for the last 12 months
Accurate description
4.9
Reasonable shipping cost
5.0
Shipping speed
5.0
Communication
5.0

Seller feedback (55)

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Product ratings and reviews

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4.9
28 product ratings
  • 26 users rated this 5 out of 5 stars
  • 1 users rated this 4 out of 5 stars
  • 1 users rated this 3 out of 5 stars
  • 0 users rated this 2 out of 5 stars
  • 0 users rated this 1 out of 5 stars

Would recommend

Good value

Good quality

Most relevant reviews

See all 24 reviews
  • by murpee0
    Nov 05, 2019Top favorable review

    Well designed and very rugged.

    This is a very rugged unit. I do like the rubber skid pads that help to grip on flat surfaces. The unit assembles easily. It is great for ''gadget'' type hobbyists, yet I did MC in the military, and this is the genuine article.

    Verified purchase: YesCondition: NewSold by: fucheng4901

  • by 94bond
    Jan 13, 2017Top critical review

    fine key, ugly oscillator

    I'm pleased with the key, but not with the sound of the oscillator. Each beep descends rapidly in pitch, with the result that even perfectly keyed morse code sounds a little drunk. The tone is also raspy and harsh (triangle wave). I checked some YouTube videos, and it seems these traits are typical of this model, although not all descend in pitch as much as mine does. My oscillator is so repulsive to my ear that I ended up buying a serial to usb conversion cable so I could use software on my computer to generate the sound. If I had known the oscillator was going to be like this then I probably would have purchased a higher quality key without an oscillator.

    Verified purchase: YesCondition: NewSold by: gigaparts

  • by niog_58
    Feb 05, 2023

    Nice little self contained morse key.

    Morse key with adjustable gap and tension. Volume and tone button. Takes a 9v battery. Reasonable sturdiness and weight. Decent quality for price and an all in unit for anyone who just wants to either learn morse or practice morse.

    Verified purchase: YesCondition: Pre-OwnedSold by: spray281

  • by jihus-36
    Oct 03, 2018

    GREAT Product!!!!!

    This device has really helped me to send Morse Code much better. After listening to my coding, I have recognized several issues that I need to address to send more consistent cod. Thank you for a wondedrful product. -Dave H,

    Verified purchase: YesCondition: NewSold by: gigaparts

  • by lada1467
    May 05, 2021

    Works great

    Works great, heavy enough to not move around, rubber pads prevent scratching surfaces. I see no need for a separate power supply, the battery is lasting a long time.

    Verified purchase: YesCondition: NewSold by: gigaparts

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