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RF Power settings on FT-857D
Just got my new FT-857D which I love, but I haven't found a menu option for
reducing the RF power while tuning antennas. Currently I only have a G5RV HF antenna, and an MFJ-901 Tuner for it. Will transmitting at full power (100 watts) while using the antenna tuner, for a few seconds harm this radio any, or am I too worried about nothing? |
#2
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RF Power settings on FT-857D
Just got my new FT-857D which I love, but I haven't found a menu option for
reducing the RF power while tuning antennas. Currently I only have a G5RV HF antenna, and an MFJ-901 Tuner for it. Will transmitting at full power (100 watts) while using the antenna tuner, for a few seconds harm this radio any, or am I too worried about nothing? The radio is going to go into high-SWR foldback, almost certainly, if it sees an SWR over 1.5:1 or so. The manual doesn't seem to say whether this situation puts an undue strain on the finals. There are a couple of ways to reduce power when tuning. To do it manually, just adjust menu #75 before tuning and then turn it back up afterwards. The Yaesu FC-30 autotuner supports this radio directly (it plug into the CAT port), Similarly, the Yaesu ATAS antenna can be connected to the radio. For both of these, once you set up the radio, you can turn to multi-function row K, press TUNE once to enable the tuner, then press and hold TUNE for a second - the radio will then transmit a low-power carrier and activate the FC-30 autotune sequence or tune the ATAS position. When done tuning it returns to whatever power level you've set in menu 75. There are aftermarket products which permit automatic low-power tuning of one sort or another with non-Yaesu antennas. BetterRF sells a "Yaesu Tune Control" which plugs into the CAT port... it makes the radio "think" that it's connected to an FC-30 autotuner, and enables the low-power TUNE feature of row K. You can use this with a manually-controlled screwdriver antenna and adjust the antenna position via a separate toggle switch (that's the approach I use). The tune-controller also has a 4-pin Molex jack into which one can plug an Icom AH-3 or AH-4 or compatible autotuner... the tune-controller in effect translates the Yaesu autotuner control protocol into an Icom-compatible protocol. -- Dave Platt AE6EO Friends of Jade Warrior home page: http://www.radagast.org/jade-warrior I do _not_ wish to receive unsolicited commercial email, and I will boycott any company which has the gall to send me such ads! |
#3
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RF Power settings on FT-857D
"Dave Platt" wrote in message
... Just got my new FT-857D which I love, but I haven't found a menu option for reducing the RF power while tuning antennas. Currently I only have a G5RV HF antenna, and an MFJ-901 Tuner for it. Will transmitting at full power (100 watts) while using the antenna tuner, for a few seconds harm this radio any, or am I too worried about nothing? The radio is going to go into high-SWR foldback, almost certainly, if it sees an SWR over 1.5:1 or so. The manual doesn't seem to say whether this situation puts an undue strain on the finals. There are a couple of ways to reduce power when tuning. To do it manually, just adjust menu #75 before tuning and then turn it back up afterwards. The Yaesu FC-30 autotuner supports this radio directly (it plug into the CAT port), Similarly, the Yaesu ATAS antenna can be connected to the radio. For both of these, once you set up the radio, you can turn to multi-function row K, press TUNE once to enable the tuner, then press and hold TUNE for a second - the radio will then transmit a low-power carrier and activate the FC-30 autotune sequence or tune the ATAS position. When done tuning it returns to whatever power level you've set in menu 75. There are aftermarket products which permit automatic low-power tuning of one sort or another with non-Yaesu antennas. BetterRF sells a "Yaesu Tune Control" which plugs into the CAT port... it makes the radio "think" that it's connected to an FC-30 autotuner, and enables the low-power TUNE feature of row K. You can use this with a manually-controlled screwdriver antenna and adjust the antenna position via a separate toggle switch (that's the approach I use). The tune-controller also has a 4-pin Molex jack into which one can plug an Icom AH-3 or AH-4 or compatible autotuner... the tune-controller in effect translates the Yaesu autotuner control protocol into an Icom-compatible protocol. -- Dave Platt AE6EO Friends of Jade Warrior home page: http://www.radagast.org/jade-warrior I do _not_ wish to receive unsolicited commercial email, and I will boycott any company which has the gall to send me such ads! Exactly the information I was looking for! Thanks! I don't know why it wasn't given a little more prominence in the manual. I downloaded the .PDF version of the operating manual and did several searches for "power level", "power" and other keywords, but never noticed that menu item. Now that you told me which menu option to look for, it seems obvious, but somehow, I overlooked it. Thanks again! I feel MUCH better tuning the antenna now! |
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