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#1
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Mobile FT-100D Problem
Yaesu FT 100D installed in a Jeep Grand Cherokee with roof mounted
2m/70cm antenna and a mag mount for HamStick monoband antennas. I have HamSticks for 10m, 20m, 40m and 75m. On 10 and 20 m, everything works well. On both 40 and 75m, the transmitter trips on high SWR even though an antenna analyzer shows SWR of 1.3 for both antennas. Folks at HRO say that is typical of Yaesu equipment and have no suggestions. I've emailed Yaesu but have not gotten a response. Anyone here have any ideas on solutions? Roger Baldwin kg6ras |
#2
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I have both a FT-100 plain and a D....
I would make sure that you have a good "strap" ground connecting all. Start at the antenna, go to the tuner then to the radio then to chassis. In addition, use a very short lead for the radio ground, and go directly to the battery for plus. I have seen that the FT-100 is just a bit more susceptible to RF than my Icom 706's but I did resolve my RF problem with proper grounding. I run a big ugly bugcatcher and on top of that an 8' whip! Works 75/40/20/17 v-e-r-y well.. If I was Yaesu, I would fire HRO for such a statement. Perhaps that was "just" the sales guy's spin, not HRO's statement. Frank KG9H "Roger Baldwin" wrote in message ... Yaesu FT 100D installed in a Jeep Grand Cherokee with roof mounted 2m/70cm antenna and a mag mount for HamStick monoband antennas. I have HamSticks for 10m, 20m, 40m and 75m. On 10 and 20 m, everything works well. On both 40 and 75m, the transmitter trips on high SWR even though an antenna analyzer shows SWR of 1.3 for both antennas. Folks at HRO say that is typical of Yaesu equipment and have no suggestions. I've emailed Yaesu but have not gotten a response. Anyone here have any ideas on solutions? Roger Baldwin kg6ras |
#3
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Wonder where the RF is getting into the radio. Can you slowly increase the
power out until you see some effect, then start grabbing wires or putting on beads. An in-line SWR bridge may be a help. When I put my 706 into a Camry, I put 5-6 of those 1 inch beads on the coax right at the antenna because the in-line SWR bridge (one of those with the connector on each end and the coupled lines inside w/ meter & fwd-rev switch, from the 1960's) bounced all over with the position of the _MIC_! How about clamp-on beads on the coax AND/OR power leads. Adding to what Frank said: Be sure you have a good ground at the base of the antenna. You want to keep RFoff the coax. I believe that if you find that grounding at the radio is important, then you havent kept RF off the coax at the antenna. I made a short gound strap from the antanna mount to the trunk lid (trunk-lip mount), then still needed the beads to fix it. Would have liked to run a strap also to the fender, but that, ain't easy and still allow the trunk to open. "guards, Steve K9DCI "Roger Baldwin" wrote in message ... Yaesu FT 100D installed in a Jeep Grand Cherokee with roof mounted 2m/70cm antenna and a mag mount for HamStick monoband antennas. I have HamSticks for 10m, 20m, 40m and 75m. On 10 and 20 m, everything works well. On both 40 and 75m, the transmitter trips on high SWR even though an antenna analyzer shows SWR of 1.3 for both antennas. Folks at HRO say that is typical of Yaesu equipment and have no suggestions. I've emailed Yaesu but have not gotten a response. Anyone here have any ideas on solutions? Roger Baldwin kg6ras |
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