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Reviews For: MFJ Bias Tee DC Power Injector

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

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Review Summary For : MFJ Bias Tee DC Power Injector
Reviews: 7MSRP: 34.95
Description:
Allows dc power to be applied to remote antenna tuner using the rf coax line.
Product is in production
More Info: http://www.mfjenterprises.com/Product.php?productid=MFJ-4117
# last 180 days Avg. Rating last 180 days Total reviews Avg. overall rating
0071.6
NO9E Rating: 2022-06-13
Invisible Time Owned: more than 12 months.
I use them as part of the Green Heron system with control by Wifi where the DC is sent by MFJ 4117. No problem of any kind at the legal limit and with SWR up to 3:1.
KC2IEB Rating: 2022-06-12
Inductors explode Time Owned: 6 to 12 months.
I've had 3-4 of these because I'm a glutton for punishment. These seem to only take bout 500W at 1.1 swr on 6m for a minute or so intermittent cw use before the inductors blow. Pass far, far away from these.
G4GZG Rating: 2020-10-17
Made from Junk Time Owned: more than 12 months.
MFJ live up to their name on this one - made from junk. First time out of the box, hooked up as per instructions and one melted power supply lead and shorted power supply. Lack of QC very evident and I'll never buy MFJ again.
W7TZ Rating: 2020-10-17
Another one slipped thru QA. Time Owned: 0 to 3 months.
It came with my 998rt antenna tuner. I hooked everything up according to the instructions. As soon as I turned on the power switch of the 4117 the positive lead smoked and melted the insulation. Took a complete disassembly to discover the switch traces were shorted to ground making the output rf center conductor always grounded. I made my own repairs by isolating the switch traces with a dremel and also bridging the parallel switch leads.
K7AAT Rating: 2017-07-30
Works well Time Owned: N.A.
I have been using several of these bias T's for years with nary a problem. For the money they have served me very well.
AB8UG Rating: 2017-07-30
let the smoke out Time Owned: 0 to 3 months.
It came with my 998rt antenna tuner. I hooked everything up according to the instructions. As soon as I turned on the power switch of the 4117 the positive lead smoked and melted the insulation. I submitted a trouble ticket with MFJ and am awaiting a reply.
W6OU Rating: 2017-02-26
Faulty assembly and no quality testing. Time Owned: 0 to 3 months.
With only DC power applied and the slide switch set ON, this unit shorted out the power supply. I disassembled the unit and I found the lower clips of the metal frame of the slide switch was resting on a circuit trace. This shorted out the DC circuit. Poor assembly and lack of final testing.