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Amateur Radio Antennas - For discussion of all amateur band designed antennas and related accoutrements. This includes base, handheld, mobile and repeater usage. For commercial antennas on the amateur bands please use Commercial Radio Antennas below.

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Old 09-13-2017, 1:48 PM
  Amateur Radio Operator
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Join Date: Jan 2015
Location: Amelia, VA
Posts: 16
Smile Tuning with an FT-757 GX II

Name here is Sean, WB4UR

Rig is a Yaesu FT-757 GX II and using an MFJ 245-E Tuner.

Antenna is an HF5B / Butternut on a mast 30 Ft up on Rohn Tower.

Having a time tuning to get a low SWR when using SSB - mainly Upper Sideband.

What Frequency and Mode is recommended to tune up on. (I hear CW or AM)

The Inductor is labeled A - L.

I have had the HF5B since 2005.

Whenever I tune for the lowest SWR and think that the SWR is low, I key up on a vacant frequency and the SWR needle goes up at the same time. I have the tune button in the out position when I do this.

I would like a refresher instruction on tuning up on the bands, especially on 20m if I want to check into the net on 14.300 USB. Is there a video on YouTube that would steer me in the right direction?

Thank you
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Old 09-13-2017, 4:26 PM
ko6jw_2's Avatar
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Amateur Radio Operator
Amateur Radio
Join Date: May 2008
Location: Santa Ynez, CA
Posts: 520

The Butternut should have a 200Khz bandwidth on 20M. Tuner should not be necessary. What is the SWR without the tuner?

You should tune/measure using AM or CW (key down) at low power. You cannot measure/tune on SSB - no carrier to measure.

Do you have a separate SWR meter or are you using the tuner?

I cannot find info on the tuner.

Checking that the antenna is working would be the first step.
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Old 09-13-2017, 5:39 PM
  Amateur Radio Operator
Amateur Radio
Join Date: Aug 2015
Location: Santa Monica, Ca.
Posts: 316
Default 757

You must tune with a carrier, cw or rtty mode. When you take off the top cover there is a switch to transmit on all received frequencies. On the back are switches that must be out or it will not transmit
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