Results 1 to 5 of 5

Thread: Brand New FT-857D RF Gain "Problem" Solved by changing Menu 80!

  1. #1

    Default Brand New FT-857D RF Gain "Problem" Solved by changing Menu 80!

    I was having a RF gain issue with my brand new FT-857D. The RF gain would die intermittently upon release of the PTT switch or when changing bands, (I described the problem in detail in a recent prior post ("Brand New FT-857D ...).

    Yaesu recommended I send the rig in for warranty service. After testing the rig, Yaesu referred me to Page 38 of the Manual concerning "Menu 80", that deals with the programming of the RF Gain/Squelch knob.

    I had the knob programmed as "Squelch" because I sometimes like to work 2 meters and figured that was a convenient setting. The manual indicates that when programmed as a "Squelch" the RF gain would be set to maximum sensitivity in all modes. So I figured I was getting max RF gain in HF mode, and "Squelch" when I switched bands to VHF/UHF. In HF mode, everything seemed to work fine, at first. I had the knob turned all the way counter-clockwise so the squelch was basically disabled in HF mode. RF gain seemed to be fine on receive, except that I noticed an intermittent problem where the RF gain would die upon release of the PTT switch during a QSO or when calling CQ. This could also happen when just changing bands.

    When Yaesu got the rig, they were able to duplicate the "problem". However, Yaesu made it clear, that despite what page 38 of the manual says about the RF gain, programming the knob as a "squelch" will cause a drop in the signal in HF mode when the PTT switch is released. In other words, the receiver cannot fully recover after transmit in HF unless the knob is programmed for "RF Gain" in menu 80.

    I have been testing the rig, and it does seem to work acceptably in HF mode with menu 80 set for "RF gain". So basically, you need to change Menu 80 when going from VHF/UHF to HF, from "Squelch" to "RF Gain".

    Hope this saves someone some trouble.

  2. #2

    Join Date
    Aug 2017
    Posts
    142

    Default

    Helps to read the owners manual - huh!

  3. #3

    Default

    Well, in this case, reading the manual did not help very much! I have been a ham a long time and have had many rigs. I think my interpretation of the manual was reasonable, although I can see another way to interpret it.

    Anyway, if any of you FT-857D owners out there start experiencing RF gain drop out, my experience may help you. The problem had me frustrated for weeks, and even Yaesu suggested I send the radio in for service after I described the problem and even sent them a video of the symptoms. The problem was a little tough to diagnose. I wish I had figured out the solution before spending the money to ship it to Yaesu.

  4. #4

    Default RF Gain problem NOT solved by changing menu settings. Bad Relay!

    Well it has been 9 months since my purchase of the FT-857D, and the RF Gain problem has finally been solved.

    Menu 80 settings did not eliminate the RF Gain problem, after all. I found a good repair shop that was willing to take time diagnosing the fault and they found a defective relay that was causing all the trouble. (I posted some good videos on my Google Drive and that really helped the repair shop in making a preliminary diagnosis.)

    I got the rig back a few days ago and it is working fine.

    Perhaps this post will help someone in the future if they experience the same fault.

  5. #5

    Join Date
    Nov 2017
    Location
    With my wife
    Posts
    81

    Default

    Thanks for the follow up. It's rare on the forums to find out the resolution to an issue. A relay... not gonna find that in the manual, ha! Congrats on seeing it through, enjoy the rig. Maybe even get you in my log... 73 Eric wz7u

Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •