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Reviews For: MFJ-919 4:1 Current Balun 1.8-30Mhz

Category: Antenna parts, accessories, incl. baluns, hardware, etc.

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Review Summary For : MFJ-919 4:1 Current Balun 1.8-30Mhz
Reviews: 2MSRP: 59.95
Description:
MFJ 4:1 current balun designed to replace the centre
insulator of a dipole antenna.The MFJ-919 is a 1500 Watt
true current balun that transforms 200 ohms to 50 ohms
Product is in production
More Info: http://www.mfjenterprises.com/Product.php?productid=MFJ-919
# last 180 days Avg. Rating last 180 days Total reviews Avg. overall rating
0021
GJ6WRI Rating: 2022-01-26
Don't put RF through it! Time Owned: 0 to 3 months.
This product is appalling. It is incorrectly advertised, and it isn't suitable for exterior use unless it never rains in your grid square. I was suspicious about the construction as soon as I removed it from its shipping packaging. The SO239 was loose. To investigate, I removed the covers and was shocked at what I found. The SO239 moved because the 2 retaining nuts and bolts weren't tightened. More alarmingly, the centre core of the SO239 wasn't connected! I've taken pictures that show there has never been solder inside of the connector! I'm glad I check before installing on my mast. I also concur with an earlier post that the product is stated to have "two large low-permeability ferrite cores". Well, no it doesn't. There is only one.
This product is junk.
VK5UV Rating: 2015-04-13
Not Impressed Time Owned: 0 to 3 months.
I am using the balun to match an all band delta loop to a 50 ohm coax feeder. The website and enclosed instructions state "they are made up of two low-permeability cores". Clearly there is only a single core and the information is misleading. While designed for mounting at the centre of a dipole the plastic case is not weatherproof. The stainless support eye-bolt at the top is poorly sealed and allows the ingress of water. The side covers are loose, are not sealed to the main case and flop around as they are only held by two screws. In its present form the balun is not suitable for external mounting without further sealing. I have mounted mine on a pole under a bucket.
Electrically the balun works satisfactorily. I have referred the matter to MFJ and no response after 3 weeks.The MFJ website data indicating two cores is still incorrect.