Announcement

Collapse

Forum rules and expectations

Hello, and welcome to the forums at the Nautilus Drydocks, formerly Sub-driver.com!

We welcome anyone with a passion for submarines and a desire to learn and share knowledge about this fascinating hobby. Use of these forums indicates your intention to abide by our code of conduct:


1. No spam. All automated messages, advertisements, and links to competitor websites will be deleted immediately.

2. Please post in relevant sub-forums only. Messages posted in the wrong topic area will be removed and placed in the correct sub-forum by moderators.

3. Respect other users. No flaming or abusing fellow forum members. Users who continue to post inflammatory, abusive comments will be deleted from the forum after or without a warning.

4. No threats or harassment of other users will be tolerated. Any instance of threatening or harassing behavior is grounds for deletion from the forums.

5. No profanity or pornography is allowed. Posts containing adult material will be deleted.

6. No re-posting of copyrighted materials or other illegal content is allowed. Any posts containing illegal content or copyrighted materials will be deleted.
See more
See less

Radio transmiter problem.

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • Radio transmiter problem.

    Hi all. My FUTABA 6EXA in 35 Mhz has worked superbly for 18 years. But triste weekend is not able to reach more than 7 feet range. Have chekced with the two subs I operate with this transmiter and the outcome is the same: At more than 7 feet range, the subs lost the signal. Any suggestion

  • #2
    Originally posted by reddevil View Post
    Hi all. My FUTABA 6EXA in 35 Mhz has worked superbly for 18 years. But triste weekend is not able to reach more than 7 feet range. Have chekced with the two subs I operate with this transmiter and the outcome is the same: At more than 7 feet range, the subs lost the signal. Any suggestion
    I assume the range-check was in air with the antenna collapsed? You using the same crystals as the ones installed 18 years ago? Are you getting at least 25mW's out of the antenna that is typical for this kind of gear? Electrolytic capacitors go sour over time -- might be the issue.

    David
    Resident Luddite

    Comment


    • #3
      Also, what environment are you running it in, and where is the antenna located?

      Rob
      "Firemen can stand the heat"

      Comment


      • #4
        I have checked both in the air and in the water n exactly the same operational conditions I've been running the subs all these years. Both have run without any problem till today. Both have an aerial extension out of the WTC. The crystals are the same I've using all these years. Don't know how to get transmitter antenna output because there is no gauge for that in the set. And yes, looks like there is someting dead inside the transmitter. Thanks for the feedback.

        Comment


        • #5
          Originally posted by reddevil View Post
          Hi all. My FUTABA 6EXA in 35 Mhz has worked superbly for 18 years. But triste weekend is not able to reach more than 7 feet range. Have chekced with the two subs I operate with this transmiter and the outcome is the same: At more than 7 feet range, the subs lost the signal. Any suggestion
          Every transmitter has an rf final stage. Maybe yours has just worn out . Does it come with a schematic?
          Last edited by Das Boot; 02-07-2022, 03:16 AM.
          Of the 40,000 men who served on German submarines, 30,000 never returned.”

          Comment


          • #6
            Have to look about. The problem is that the transmitteer is toooooo "veteran" and it would be almost impossible to find spares and repairing service. In fact, I'm looking for a new one as well.

            Comment


            • #7
              Open the TRX case and check that the wire going to the antenna is still soldered on at either end-BG

              Comment


              • #8
                Great tip to consider. I'll check it. AAny way. In case I'll have to get a new one, Does a 2,4 Ghz set fit the job? Because some one has told me that frecuency doesn't get underwater.

                Comment


                • #9
                  Done. All the wiring seems to be properly connected, and nothing looks or smell fried.

                  Comment


                  • #10
                    If you are unfamiliar with the electronics of the transmitter, I would suggest you contact Futaba (https://futabausa.com/repairs/) and talk with them about the problem. If it is a simple fix, they will tell you how to do it, or you may have to send it in for a repair.

                    Comment


                    • #11
                      Originally posted by Mooneyjock View Post
                      If you are unfamiliar with the electronics of the transmitter, I would suggest you contact Futaba (https://futabausa.com/repairs/) and talk with them about the problem. If it is a simple fix, they will tell you how to do it, or you may have to send it in for a repair.
                      They’ll say it’s obsolete and have no replacement parts. Pick up a 72 MHz radio.
                      Of the 40,000 men who served on German submarines, 30,000 never returned.”

                      Comment

                      Working...
                      X