|Customer Reviews for the MFJ-931.|
|From: Marty KB0QZ|
|Purchased the MFJ-931 Artificial Ground Tuner after failing to find a workable HF antenna solution for a second story apartment. Always have had access to full size dipoles and short earth ground connections do this was a challenge especially since I was wanting a solid signal on 80 meters. Without the MFJ-931 any antenna (tried a ham stick on a metal balcony and an attic 35ft dipole) but neither were effective and had RF evident at the Transceiver. With the MFJ-931 I was able to increase my signal strength at the receiving end and no RF was observed at the Transceiver. |
More antenna tests will be tried but the MFJ-931 will be used in future antenna systems. I am convinced that it solves remote grounding issues, maybe not as good as a short connection to a solid earth ground, but when one is not available it is better than even using a Balun based upon my experiments. The Manual is vague on the wire counter poise - my experiments show two is better than one especially if they are different lengths. In future tests I intend to have several lengths that are approximately quarter-wave lengths for my favorite HF bands.
MFJ-915RF ISOLATOR, 1.8-30MHZ, 1500W PEP$29.95
MFJ-994BRTTUNER, AUTO, REMOTE, 600W, 1.8-30 MHZ$399.95
MFJ-266CHF/VHF/220MHZ/UHF ANTENNA ANALYZER$359.95
MFJ-989DANTENNA TUNER, 1.8-30 MHZ, LEGAL POWER$409.95