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The MFJ-915 RF Isolator is a 1:1 Current Balun, designed to be placed in line with any 50-Ohm coax. The RF Isolator is effective from 1.8 to 30 MHz. It was designed to improve the performance of all amateur stations, fixed or mobile. MFJ-915 will reduce or eliminate stray RF often found on coax. This stray RF can cause burns, TVI, interference and other problems with electronic equipment in ham-shacks and vehicles. Stray RF also results in a loss of radiated power from the antenna, which will lead to a great reduction in signal strength. Use of the MFJ-915 will increase the efficiency of all amateur stations. Great when used in conjunction with a TVI filter too. SO-239 Input & output connectors. To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyzed reviews to verify trustworthiness."Worked fantastic. In y opinion it was a good choice." Read more"As described, great value Works as intended." Read more"...Very good result..." Read more"...to provide other than it arrived in good order and functions properly as an RF isolator." Read more"...But once I installed this isolator, my RFI is virtually gone. Also, my receiver noise is radically reduced...." Read more"...It works great and has stopped RF that was getting into my ham shack on the coax shielding." Read more"Helps with RF..." Read more"Helps To Suppress Stray RF!..." Read more"...Now all that is gone and I put out a great signal. I keep the MFJ-915 inside the shack...." Read more"...Now I can receive even the faintest transmissions which I couldn't hear over the humming noise. Highly recommend." Read more"...RF coming into my rig and effecting my mic output.. this cleaned my signal up perfectly... its also not very large about 2" diameter and 7" long now..." Read more"...a similar device that is built into an aluminum case, and its build quality is higher. But it also three times the price...." Read more"...during construction. MFJ is notorious for poor quality control, and I've read of a few of these needing repair by purchasers, but I've bought 3 so..." Read more"...I ended up using them but only because I bought them. They do no harm, but I question their value." Read more"...14/3/23 The replacement arrived today and yet again it seems to be faulty, this time it has a rattle inside it, something is broken inside the filter..." Read more"...The MFJ-915 RF Isolator completely wiped out the humming noise...." Read more"...Also, I found it didn't help with reducing noise from the solar panels and inverters very much at all...." Read more"...Also, my receiver noise is radically reduced. For the money, this is the best well spent." Read more"It was supposed to be a good filter for my ham shack..it never took any noise or line noise 6g" Read more"...End caps are too thick. I couldn't even thread the males on. Rattles when you shake it...." Read more"...today and yet again it seems to be faulty, this time it has a rattle inside it, something is broken inside the filter, I will not be opening it as I..." Read more"When I received my unit it had a distinct rattling sound inside of it, I'm going to assume that the ferrite or toride or whatever the heck is in..." Read more