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JLPurcell

Antenna Rebuild / Restore

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    11 hours ago, chaskill said:

    Ouch!  I'm sorry for your loss, Captain Obvious.  Thanks for the helpful pics though.  That's what I was suspecting I might be up against, but glad I checked.  I may try a drop of vinegar if another round of heating doesn't work.

    Well it wasn't a total loss, but it was one of those project steps which should have taken fifteen seconds turned into an hour of work. After the BFI removal, I cleaned everything up and made an "adapto-matic" extension to replace the original cut off portion and put the length back to where it should be.

    My aluminum adapter:
    P1040253.JPG

    Goop it up inside with silicone and put it back together:
    P1040254.JPG\

    I actually made two adapters, but I don't remember exactly why. Either I needed to change diameters to use the mast from a different antenna, or it was simply "I cut it twice and it's still too short". Been too long to remember that detail, but in the end, the mast looked like this and it worked great:
    P1040255.JPG

    So like so many projects, it wasn't a total loss, but it took way longer than it should have because of unforeseen surprises.

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    I managed to get the mast out using this penetrating liquid.

    IMG20200625180149.jpg

    But I cannot extend all parts of the mast. I can extend a few but not all.. I tried putting more liquid wrench into the mast itself and left it a few days but still didn't work.

    I also couldn't remove the mast tube from the body either.. I've tried a propane torch to heat it and penetrating fluid but so far no joy... any other ideas?

    IMG20200625180122.jpg

    IMG20200626151316.jpg

    I also got thinking about potential mast replacements.. for the arrow tip...

    A few are on eBay for $16.

    https://www.ebay.com/itm/Power-Antenna-AM-FM-Radio-Replacement-Mast-Cable-Cord-For-95-98-Nissan-240SX/323185742673?epid=20017502835&hash=item4b3f5f1351:g:JTkAAOSwnklawuIx

    This 1 looks close...

    https://www.ebay.com/itm/BRAND-NEW-POWER-ANTENNA-ROD-MAST-FOR-NISSAN-240SX-300ZX-MAXIMA-STANZA-1989-1996/223859901620?hash=item341f1704b4:g:IQYAAOSwydpeIpFN

    https://www.ebay.com/itm/Power-Antenna-Aerial-AM-FM-Radio-Replacement-Mast-Cord-92-03-Mitsubishi-Diamante/133089766376?hash=item1efcc4abe8:g:7~EAAOSwiuFepPQC

    If these are made of stainless could you dremmel them into an arrow tip shape? As a potential replacement?s-l500.jpg

    s-l1600.jpg

    s-l500 (1).jpg

    I'm thinking if this is made of stainless you could shave it down (to required profile) and then polish it up again ?

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    1 hour ago, Gav240z said:

    I managed to get the mast out using this penetrating liquid.

    IMG20200625180149.jpg

    But I cannot extend all parts of the mast. I can extend a few but not all.. I tried putting more liquid wrench into the mast itself and left it a few days but still didn't work.

    I also couldn't remove the mast tube from the body either.. I've tried a propane torch to heat it and penetrating fluid but so far no joy... any other ideas?

    IMG20200625180122.jpg

    IMG20200626151316.jpg

    I also got thinking about potential mast replacements.. for the arrow tip...

    A few are on eBay for $16.

    https://www.ebay.com/itm/Power-Antenna-AM-FM-Radio-Replacement-Mast-Cable-Cord-For-95-98-Nissan-240SX/323185742673?epid=20017502835&hash=item4b3f5f1351:g:JTkAAOSwnklawuIx

    This 1 looks close...

    https://www.ebay.com/itm/BRAND-NEW-POWER-ANTENNA-ROD-MAST-FOR-NISSAN-240SX-300ZX-MAXIMA-STANZA-1989-1996/223859901620?hash=item341f1704b4:g:IQYAAOSwydpeIpFN

    https://www.ebay.com/itm/Power-Antenna-Aerial-AM-FM-Radio-Replacement-Mast-Cord-92-03-Mitsubishi-Diamante/133089766376?hash=item1efcc4abe8:g:7~EAAOSwiuFepPQC

    If these are made of stainless could you dremmel them into an arrow tip shape? As a potential replacement?s-l500.jpg

    s-l1600.jpg

    s-l500 (1).jpg

    I'm thinking if this is made of stainless you could shave it down (to required profile) and then polish it up again ?

    @Captain Obvious

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    The mast will come apart the tip of the antenna is screwed on take that off and you can slide the attenna apart.  The threads are small so use a little heat on the tip to loosen a little.  I took mine apart to replace the string see the link.

     

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    Making a mast tip from scratch should be a relatively easy task on a lathe. I might be convinced to give it a go if someone has a sample to use as a pattern.

    As for getting the mast out of the body, all I can do is assure you that there's nothing holding it in other than corrosion.

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    11 hours ago, Captain Obvious said:

    Making a mast tip from scratch should be a relatively easy task on a lathe. I might be convinced to give it a go if someone has a sample to use as a pattern.

    I'll put one in the mail for this endeavor tomorrow Cap'tn.

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    Posted (edited)
    13 hours ago, Captain Obvious said:

    Making a mast tip from scratch should be a relatively easy task on a lathe. I might be convinced to give it a go if someone has a sample to use as a pattern.

    No charge I imagine. He works on tips, like a mohel.

    Edited by siteunseen
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    LOL. I tried to find the old SNL spoof ad where they circumcised a baby in a car to illustrate the smooth ride. But SNL has clamped down pretty hard on copyright stuff and I couldn't find it.

    Zup, I'll keep my eyes peeled.   :cool:

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    So @Zup, I got your chewed up (what used to be an) antenna tip  LOL   Perfect for my experiments.

    The first thing I can tell you is that it's chrome plated brass, not stainless. And I expect this to be the case for those antennas on ebay. Why is that important? Couple reasons:

    First, it means the prospect of buying something similar off ebay and taking a dremel to it isn't going to work unless you plan to send it out for new chrome plating afterwards.

    Second, it means that the "color" is different than stainless. Now unless you think some judge at a concourse show is going to dock you points for having a stainless antenna tip instead of chrome plated........

    With all that said, it was tropical storming today and I had some time in the shop. Here's some pics:
    P1170151.JPG

    I had some other antenna here from a later year that I could mess with too:
    P1170153.JPG

    P1170156.JPG

    I made two proof of concept tips. One brass, and one stainless:
    P1170157.JPG

    The stainless would look better if I polished it. I didn't bother with that. Would still look different than chrome plating, but closer.

     

    P1170150.JPG

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    That looks fantastic to me. Are you thinking of offering them for sale? Given the amount of antenna motors I see on eBay missing the antenna itself (broken) I'd say being able to offer a repair option with the cool looking arrow tip (my opinion) could be a winner?

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    Well I hadn't thought much about a sales prospect, but I didn't hate making these.

    However, I didn't make the internal threads yet* as I did not have the correct tooling. I've got that tooling (special taps) on order and if that tapping process doesn't turn out to be a disaster, then I could probably be convinced to make a couple for sale if people need.

    Of course, that tapping process (especially in stainless) could still turn out to be a disaster.  I'll let you know after the taps arrive.

    * The astute viewer might ask "Then how does it look like your brass tip is threaded onto the antenna in your pic???" The answer is... I drilled it out so it just slips over the threads. Proof of concept for outside shape only. I'm not really worried about tapping brass. The stainless concerns me more.

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