![]() I have taken it down when we had higher winds had exceed the 15 MHP. It has been flying on most days in 5 to 15 MPH winds. The SWR is on these bands is 1.0 – 1.3, so I would expect good performance if I had more power.Īt this point in time the only negative I have to report is the flag. Not much of an night owl so I don’t get very much of a change to use the antenna on 40 – 160 meters. I have done some work on 40 meters but not much. Most of my contacts have been 10 MHz – 28 MHZ. I am using a SGC 230 tuner mounted at the base of the antenna All of my contacts have been made on 70 – 100 watts. ![]() SSB has been good with good signal reports depending on propagation. Have done a lot of FT4 and FT8 with good reports. The DX into Europe and Africa has been good. The SWR on most band has been =< 1.5 except the 12 meter band. The performance of the antenna has been very good. I installed the antenna in the back yard in the HOA and have not had any complaints. The install was easy with only a couple of small issues that were easily resolved by just thinking things through. I installed the flagpole the end of January here at my home in central Florida. I purchase a 20’ Flagpole antenna that also included the 4’ extension. It could be the difference between hearing a station, or not. RF Chokes can be placed after the radio or after the amplifier.Īgain, the well studied operators add a second RF Choke, 500W or 3500W, immediately after the radio or amplifier. Also, a small RF Choke on the radio side can mitigate QRN, or noise captured along the coax back to the radio station. They are typically installed before the Remote Tuner at the base of your DX Flagpole Antenna or HF Vertical Antenna. Our chokes are rated between 500W to 10 kW and provide up to 5000 Ohms of suppression. We then match the RF Choke designs (current baluns, RFI line isolators, baluns) around each antenna system's requirements.īy focusing on smaller, peer owned boutique businesses, we are doing our part to share our projects in a niche marketplace and continue to find improvements in the details. Made in the USA by small ham radio owned businesses.īy aligning with multiple well-respected antenna designers and RF engineers we find a better insight into what's available on the market today. We study the market and offer our solutions as 'best of breed' for each antenna system and component. Therefore, Greyline seeks wisdom from expert RF engineers with know-how in ultra high quality and results. If you have an RFI problem in your shack, then one of these MFJ-915 RF Isolators will help.RF Chokes are important to get right. The entire assembly is enclosed in schedule 40 PVC pipe for maximum strength and protection. The coax and SO-239 connectors have PTFE insulation which extends the life of the product. These RF Isolators are made up of 50 Ferrite Core Beads, placed onto a 13-inch piece of RG-303 coax. Use of MFJ-915 RF Isolators will increase the efficiency of all HF amateur stations. Stray RF also results in a loss of radiated power from the antenna, which will cause a reduction in radiated signal strength. ![]() If strong enough, this current may cause RF burns or other problems with electronic equipment in ham shacks and vehicles. ![]() MFJ RF isolators reduce or eliminate stray RF often found on coax shields. ![]() They were designed to improve the performance of all amateur stations, fixed or mobile. These RF Isolators are effective from 1.8 to 30 MHz at full SSB legal power. MFJ-915 RF Isolators are 1:1 ferrite chokes designed to be placed in line with 50-Ohm coax. ![]()
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