2025年2月20日 · IMO those MFJ lightning protection switches are a defective design that may work with some combinations of antennas where the RF ground is earth ground (like verticals). But with any combination of dipoles that have a floating RF ground they won't work if you expect your tuned SWR to be what you got without the switch in the circuit.

2024年8月9日 · MFJ active antennas in the past and they were garbage. Sorry MFJ fan folks. The issue is they have no shielding in the case. Which relates to them being noise makers not gain makers. Don't waste your your money on these. Also most active antennas will benefit with a 20-50' wire antenna placed outside, the built in telescope

2008年12月12日 · MFJ 1020 Active (Indoor) Antenna Bob Parnass, AJ9S The MFJ 1020 Active Antenna consists of a telescoping antenna and a preselector-type circuit inside the now familiar beige and wood grain cabinet. The frequency coverage of approximately 200 KHz to 30 MHz is divided into 5 bands. A small, external power supply is required, but not provided.

2019年1月9日 · Some time ago MFJ offered a free download of a PDF book of dipole and long-wire antennas by Ed Noll. It was originally published in the 60s but reprinted in 1992. I had downloaded the book but completely forgot I had it. It's a pretty big download - just over 76MB - so I can't post it here or on the wiki.

2017年3月7日 · You might find the small antenna filling in where you wire has a null. That's not to say the super short MFJ antennas work well, they just might work better than the worst null on your wire. One antenna I had that was a little similar to the MFJs you mention was the Cushcraft MA5V 20 through 10m vertical.

2006年9月27日 · MFJ-1729 Power*Gain 144/440 MHz Magnet Mount Mobile Antenna Click the thumbnail for a full-size picture. MFJ-1729 MFJ's Power Gain is ham radio's most powerful dual band magnet mount mobile antenna! It gives you outstanding gain on 440 MHz and 2 Meters. Low SWR lets you rig deliver full power safely.

2018年10月14日 · I ordered an MFJ-1886 loop receiving antenna from GigaParts for $259.00 with FREE shipping. While I realize $259.00 is $10.00 more than MFJ's price direct., but the FREE shipping from GigaParts saved me $30.00! It had to be ordered but I had in 2-weeks, dropped ship direct from MFJ! I haven't had a chance to set it up yet.

2012年3月20日 · MFJ-2982 I am also interested in this featherweight vertical as a means of setting up an antenna in a CCR restricted neighborhood. My plan would be to use a ground mount like the MFJ-1901, leave it and the radials in place, and only mount the antenna when I …

2018年1月15日 · My MFJ-259B has always been an integral part of the shack test equipment. While it does not cover the UHF ham bands it is still valuable when testing and troubleshooting antennas. Also is a frequency counter and a basic signal generator.

2009年6月16日 · So I put up a 2 meter antenna on the house. Used Belden 9913 coax. I hook up the MFJ 259B analyzer, says the match is a beautiful thing. But also says I have 5.8 dB loss in the coax. I'm sure folks here have used the MFJ, is this thing saying that I'm losing half my signal in the coax? Is the "loss in the coax" reading an accurate reading?