RADIO HAM: Antenna Autopsy NAGOYA MAG-77-EL teardown and repair.

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  • Опубліковано 5 лис 2024

КОМЕНТАРІ • 108

  • @keithedwards2e0xsz56
    @keithedwards2e0xsz56 Рік тому +6

    Always nice to see someone repairing stuff rather that throwing it in the bin and buying new, Top Man !!!

  • @lyfandeth
    @lyfandeth Рік тому +3

    Red is usually the permanent thread locker in the US. But applied on a dirty surface, it won't be. All of them also break down when heated, that's how you get permanent thread locker to let go.

  • @dennisjoiner3717
    @dennisjoiner3717 Рік тому +1

    I sure hope you bounce back quickly. thanks for the video.

  • @johnflowers1976
    @johnflowers1976 Рік тому +1

    Thanks for the video, an I hope you're feeling much better soon Mike.

  • @arthurtwoshedsjackson6266
    @arthurtwoshedsjackson6266 6 місяців тому

    I checked the SWR on my Diamond NR770HB last week and it was in the red. Started to go through the diagnostic process. With a different antenna on the boot mount the SWR is low. Put the diamond antenna on the roof on a magmount , SWR is low. Checked all connections and all are ok. Don’t know if water has got into the antenna which has been on the car for a few years. My set up is very similar to yours in the video on your car.

  • @ferdinandwp4rjl377
    @ferdinandwp4rjl377 Рік тому +2

    Keep up the great work MIKE and get better soon.

  • @ohyeawhosurpoppy
    @ohyeawhosurpoppy Рік тому

    Thank you . Really like these technically stimulating mind boggling videos.
    Seriously, I like the "why and how" rather than "because".

  • @Paul-Howell-M3EYG
    @Paul-Howell-M3EYG Рік тому +1

    Nice one Mike. Good to see you back in action. Get well soon.

  • @adyg6ad73
    @adyg6ad73 Рік тому +1

    Get well soon. Thanks for the video 👍

  • @vinniec5286
    @vinniec5286 Рік тому

    I was wondering about the connection to the shield until you mentioned tank circuits. Enjoyed the video. Get well soon.

  • @Superfandangoo
    @Superfandangoo Рік тому +4

    Good job, though the threaded joint looked like liquid ptfe as opposed to loctite for future ref, which make sense to me preventing a Capillary action of rainwater

    • @mike-M0MSN
      @mike-M0MSN  Рік тому +1

      Well spotted, I never thought of that :)

  • @Pedro8k
    @Pedro8k 6 місяців тому

    Colinear antennas are multiple stacked antennas separated with a coil and good use of a stub for a capacitor a lot more robust good to a FM repeater still in operation in the background

  • @drewby4563
    @drewby4563 Рік тому +1

    This going to be splendid sir

  • @ianxfs
    @ianxfs Рік тому +3

    Get well soon Mike 👍🏻 Thanks for the post-mortem! I wonder if the cause (if not that cap solder) was the inner copper tip? Looked grubby when you pulled it out of the housing.

    • @mike-M0MSN
      @mike-M0MSN  Рік тому +1

      Hi Ian, Both good possibilities, shame I mashed the housing..

  • @AddFilmmedia
    @AddFilmmedia 6 місяців тому

    A nube cuestion: On the long antenna bit there is also a ”spring”-sort-of-looking feature. Is that mainly there as a way of making the antenna more flexible/bendable, or does it have any influence on the transmitted radio signal as well?

    • @mike-M0MSN
      @mike-M0MSN  6 місяців тому +1

      A 5/8 wave requires a matching coil at the bottom, there may also be something like a coil in the middle of the antenna, this may be a loading coil ( to shorten the height) or a phasing coil to allow for a secondary radiator..

  • @dodgydd
    @dodgydd Рік тому +1

    Old bicycle inner tubes make great grips for spannering stuff like that, just clean the talc off first.

    • @mike-M0MSN
      @mike-M0MSN  Рік тому

      Another great idea 👍👍👍

    • @Locksnut
      @Locksnut Рік тому

      @Mike-M0MSN Old leather belt sections make for some pretty good grips, too. Get well soon.

  • @Dan-M0MST
    @Dan-M0MST Рік тому

    Nice to see a decent radio back in the motor Mike :)

    • @mike-M0MSN
      @mike-M0MSN  Рік тому

      Thanks Dan, well it had to happen.🤪

  • @thormusique
    @thormusique Рік тому

    Very nice! It's not every day an autopsy results in the revivification of the 'patient'. It's like Frankenstein's Antenna. Cheers! 🙂

  • @G0USL
    @G0USL Рік тому

    Hope you get over the covid soon Mike, glad to see you got the antenna fixed. Some heatshrink or spray paint should tidy it up.

    • @mike-M0MSN
      @mike-M0MSN  Рік тому

      Hi Mark, no it’s a work of art… 🤣

  • @acestudioscouk-Ace-G0ACE
    @acestudioscouk-Ace-G0ACE Рік тому

    You sound like you have been hit hard with Covid. A great video, above and beyond the call of the duty; really interesting to see what went wrong with the antenna and how they are constructed.
    I hope you and your family are better soon. Best 73

  • @xandear1
    @xandear1 Рік тому

    I wish the best recovery to you.

  • @Stewart-HA5RV
    @Stewart-HA5RV Рік тому

    I have a Chinesium Diamond SG2700 with similar issues and I recalled this video and it inspired me to have a go. It's similar to yours - in my case there is only one capacitor and it's short circuit to DC which is a bad sign! 😀. Trouble is there is no markings and so no idea what the value is, so will have to do some experiments I guess...

    • @mike-M0MSN
      @mike-M0MSN  Місяць тому

      Start with 8pF and I bet it will be close.....

  • @g4lmn-ron401
    @g4lmn-ron401 Рік тому

    Get well soon Mike

  • @vbrindle
    @vbrindle Рік тому

    Hope you feel better soon.

  • @richarde735
    @richarde735 Рік тому

    get well soon Mike!!!

  • @T.M.G2014
    @T.M.G2014 Рік тому +1

    Hope your on the mend soon great couple of vids, simple repair also , and we thought you were just full of Jack Daniels lol 😆

  • @WX4CB
    @WX4CB Рік тому +1

    the reason why the coil is soldered to the "shield" side is for DC grounding. that's why there's the 2 caps there across the center and ground and is also the reason why the first 3 turns are shorted

    • @mike-M0MSN
      @mike-M0MSN  Рік тому +2

      Ok interesting, please expand.👍👍

    • @Cardassiaprime
      @Cardassiaprime Рік тому +1

      I’m sure that a capacitor would ground AC, but it would be a DC block !!

    • @WX4CB
      @WX4CB Рік тому

      @@Cardassiaprime other way around. it blocks ac but lets dc through

  • @tonymoore6395
    @tonymoore6395 Рік тому

    Mike I stripped a 770 down today thinking the same as you top of coil interference fit, it’s not your supposed to disassemble from top it’s soldered 👍 under the piece above the black Tony G7ETT I would assume yours the same😮

    • @mike-M0MSN
      @mike-M0MSN  Рік тому

      Oh ok, I will have to look at this again, how did you get pass the lift and fold mechanism?

    • @tonymoore6395
      @tonymoore6395 Рік тому

      @@mike-M0MSN the hinge is an Allen grub screw,fold it over and undo pre loaded spring from below, the brass passes through the plastic with a m10x1 thread out the other side good luck 🤞

    • @tonymoore6395
      @tonymoore6395 Рік тому

      I’ve sent you pic on qrz😊

    • @mike-M0MSN
      @mike-M0MSN  Рік тому

      @@tonymoore6395 it’s not quite the same, but fixed now thanks. Ps no video doh 🙄

  • @johnanthonycolley3803
    @johnanthonycolley3803 Рік тому

    Hi Mike your antenna looks electrically similar to the NL-770R
    ( which is on the fundamental band a ,[ Voltage Feed Centre Loaded 1/2 Wave Vertical ] )
    Antenna feed using this method is ideal for operation where the ground isn't optimal ( for example on a mag mount )
    Being presently under £20 each, ( even thou twice the length of my present antenna) I intend to try out one on my Truck :-)
    de John (: licensee G4XJC )

  • @norrinradd8952
    @norrinradd8952 Рік тому

    Glad you got it sorted. I'll send you a good strap wrench for Christmas.

    • @mike-M0MSN
      @mike-M0MSN  Рік тому +1

      A strap wrench, that a great idea 👍👍🍌🍌

  • @M0XFXUK
    @M0XFXUK Рік тому

    Hi Mike sorry to hear you are struck with the covid, get well soon mate. Really interesting looking inside the antenna , I had no idea you could take them apart like that. Yep it's pain trying to open things treated with thread lock, I find adding a little heat helps but I guess you had to consider plastic moulting. really enjoyed the video.

    • @mike-M0MSN
      @mike-M0MSN  Рік тому

      Hi John, tested positive Friday evening so still got a day or two… hope you had fun in /A.

  • @ifell3
    @ifell3 Рік тому

    Hope you get better soon, it's only been this later stage of catching it and I've had worse man flu TBH, aha.
    I've seen a dual bander on ebay for around £10, do you recommend these?

    • @ifell3
      @ifell3 Рік тому

      Sorry didn't see they have a letter after each model; the cheaper one was a 770.

    • @mike-M0MSN
      @mike-M0MSN  Рік тому +1

      I have the 770 as my standby, watch out for copies the Nagoya Mag-77-el as around £38.

  • @Joe-KN4IFI
    @Joe-KN4IFI Рік тому

    Great job Mike. You seem to do your best work when you are under the weather. hihi. Hope your feeling better. 73 Joe

    • @mike-M0MSN
      @mike-M0MSN  Рік тому +1

      It the only time I get away from work..🤧🤧😂😂

  • @1KenSweeney
    @1KenSweeney Рік тому

    Stay hydrated and get some rest, Covid is no joke...

  • @DrGianCS
    @DrGianCS Рік тому

    hope you get better soon!!!

  • @nathanw851
    @nathanw851 Рік тому

    You and Callum clearly went to the same school of brutism. I've got a know-it-all on the internet without actually having done it, hunch, that a bit of bike innertube would have given the required purchase without the burr. Maybe. Was it THAT tight? Really cool you revived it though - that's the bit that matters. Good job.

    • @mike-M0MSN
      @mike-M0MSN  Рік тому +1

      So here is the funny thing, before I turned the camera on I had the antenna in a plastic rubberised sleeve and it just would not come undone, I also tried a leather strap wrench, nope no movement. I was about to give up and simply trash it. Then I said to myself if I’m going to bin it why not just use metal to metal and open it, guess what it started to move and the rest is on UA-cam. Sometimes the only way is brute force and yes it was that tight! The things we do or show on YT are sometimes/most of the time only a fraction of the process. Thanks for the comment BTW Callum was 3 years ahead of me, we had torque wrenches. 😂😂👍

  • @InflatedDolphin
    @InflatedDolphin Рік тому +1

    Urban legends say it was shoddy solder joints that sunk the Titanic. And I hear on the grapevine that Noah used sub standard flux core solder on the ark wiring. It seems a common fault.

  • @lc79tourer26
    @lc79tourer26 Рік тому

    Nice job Mike now that's a good name for a ham, just a thought though, I think I would have thrown a coat of paint on the bottom section all the same but I assume you're all over that in time? Good video keep up the good work it is appreciated.
    Dave vk3aif

  • @sveinfarstad3897
    @sveinfarstad3897 Рік тому

    As i sayd, fix it! you did, splendid Mike!
    73 LB8LG Svein

  • @mstover2809
    @mstover2809 Рік тому

    Hope you get to feeling better soon. Wife and I both had covid a bit over a month ago.
    Mike KC5UEA

  • @DonzLockz
    @DonzLockz Рік тому

    Great fix! Maybe paint it black to look better and to stop rust if it's steel.👍

    • @mike-M0MSN
      @mike-M0MSN  Рік тому +1

      It’s chrome plated brass, I kinda like the warn look…🤪

    • @DonzLockz
      @DonzLockz Рік тому

      @@mike-M0MSN ah ok, nice. My old eyes couldn't tell on my small phone screen.🥸👍

  • @derrickmansingh4689
    @derrickmansingh4689 Рік тому

    Can you put a link as to where this antenna is sold?

    • @mike-M0MSN
      @mike-M0MSN  Рік тому

      Most suppliers however I purchased this one from ML&S

  • @pasixty6510
    @pasixty6510 Рік тому

    Thanks for this video. I use the Diamond NR 770 H which probably is about the same build. On 2m it gives me a SWR of 1. On 70cm I only get an SWR of 1.6. But in your video I can’t see what your specific problem was and you don’t really show what you fixed. Please be a bit more precise before I crack my Diamond NR770 open.

    • @mike-M0MSN
      @mike-M0MSN  Рік тому

      I will try, the issue was the bottom capacitor had become unsoldered, BTW 1.6 is perfectly good you do not need to adjust it. Cheers

  • @barryabell5410
    @barryabell5410 Рік тому

    In the future use rubber gloves under the grips to get a cleaner finish

  • @attilarivera
    @attilarivera 7 місяців тому

    👏👏👏👏👏👏👏

  • @stevec5000
    @stevec5000 22 дні тому

    How can one person have so many broken antennas?

  • @mike-M0MSN
    @mike-M0MSN  Рік тому +3

    First

  • @craigpalmer9196
    @craigpalmer9196 Рік тому

    thank you

    • @mike-M0MSN
      @mike-M0MSN  Рік тому +1

      No thank you.

    • @craigpalmer9196
      @craigpalmer9196 Рік тому

      @@mike-M0MSN now i might dive into a couple of11meter antenas and see why they perform not at all

  • @DXCommanderHQ
    @DXCommanderHQ Рік тому +2

    Eighth

  • @Atomshamradio
    @Atomshamradio Рік тому

    I woulda used a wire wheel to smooth the base instead of grinding it 😖

    • @mike-M0MSN
      @mike-M0MSN  Рік тому +2

      It was emory cloth/ glass paper.

  • @iz2mgn
    @iz2mgn Рік тому

    Vy gud job! 73, Mauri Iz2mgn

  • @RobertJeffery-l1v
    @RobertJeffery-l1v Місяць тому

    If you want to trace the circuit you can do it. But you upload the detail of the circuit, that is unlawful . You will be sued under techonology theft law.