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 Cobra 148-gtldx modified by ???

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Alan Pilot
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Cobra 148-gtldx modified by ???  Empty
PostSubject: Cobra 148-gtldx modified by ???    Cobra 148-gtldx modified by ???  Icon_minitimeWed Feb 24, 2021 11:52 am

Cobra 148-gtldx modified by ???  Mod410
Anybody recognise this work or who did this mod.
Just got this but no idea what does what.
5 was band selector and 2 switches on the back.
Also some wiring to the SWR switch.
Any help.
You might have to click on the pictures to see fully.Cobra 148-gtldx modified by ???  Mod110
Cobra 148-gtldx modified by ???  Mod210
Cobra 148-gtldx modified by ???  Mod310

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Alan Pilot
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Cobra 148-gtldx modified by ???  Empty
PostSubject: Re: Cobra 148-gtldx modified by ???    Cobra 148-gtldx modified by ???  Icon_minitimeWed Feb 24, 2021 1:39 pm

Thanks for the reply.
Just had another good look but no markings apart from what i think was a previous owners name on the back above the serial number plate DAI?????? can't make it out.
Just bought a frequency counter so will find out when that comes what it does and where it goes lol.
Just hope it's all worth it.
Radio id in good condition well it will be when the new faceplate is fitted it's got a carbon look crappy thing on it and the old plate is not underneath.
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Dmc
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Cobra 148-gtldx modified by ???  Empty
PostSubject: Re: Cobra 148-gtldx modified by ???    Cobra 148-gtldx modified by ???  Icon_minitimeWed Feb 24, 2021 1:44 pm

I would ask black spirit or pimp. Both know most of the guys these days
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Alan Pilot
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PostSubject: Re: Cobra 148-gtldx modified by ???    Cobra 148-gtldx modified by ???  Icon_minitimeWed Feb 24, 2021 2:29 pm

Faceplate just arrived just need the counter now.
Got a 500w dummy load and a digital power/swr meter (my mini microwave my son calls it looks like one) Nisdei DG-503.
Radio itself is in very good condition but dying to find out where it goes lol.
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Victor
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Cobra 148-gtldx modified by ???  Empty
PostSubject: Re: Cobra 148-gtldx modified by ???    Cobra 148-gtldx modified by ???  Icon_minitimeWed Feb 24, 2021 3:47 pm

Hi Alan mate,

You have to remember that anyone who could identify the hot end of a soldering iron thought they were a rig doctor! Very Happy
(Twiddlers were the worst kind.)

Back 'in the day' of 19-clickety-click anyone who bought a copy of Practical Wireless, Everyday Electronics or owned a Maplin catalogue also thought they were an electronics engineer! Wink

It's obviously a mod that mucks about with the PLL logic, so your frequency counter is going to be a great help if any of it works. The copper clad board everywhere is an attempt to prevent stray RF from interfering with the logic, (??), so that 14 pin chip is bound to be a CMOS logic chip and no doubt there'll be diodes under the cladding next to it, (or some other pathetic attempt at 'hiding' their super-duper conversion!)


Without delving further myself, here's some links that might help you out :-

http://www.cobraworxshopz.com/cobra_148gtl-dx_13.html

That'll at least show you what radio you've got, (it's a MK2 Wink)


Also some other stuff :-

https://www.radiomods.co.nz/modspage.html

Loads of ways of ruining, ahem sorry, modifying radios there.


Might as well throw this in too :-

http://robconet.com/cb/pllfreqmods.htm



It's all bound to have a weird setup of throw-this-switch etc. and channel 10 becomes the 555 sort of nonsense. Let's hope the radio's alignment isn't all to pot either.....twiddle-twiddle Wink

Personally I'd be inclined to put it back to original and throw in a decent conversion that makes more sense for the operator.

(A decent conversion is a tidy conversion!)


If I sound a bit nonchalant it's because I wasted so much time undoing this sort of cr*p for 'friends' back in the day and get sick of seeing it even after all these years. It's amazing how many 'friends' you garner when they know you're an electronics engineer and that couple of pints or throwing a few sovs your way never materialises! 

Honestly Alan, enjoy yourself having a play with it and if anything you gain yourself a half decent rig or can pass it along on the bay Smile


All the best,
Victor
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Alan Pilot
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Cobra 148-gtldx modified by ???  Empty
PostSubject: Re: Cobra 148-gtldx modified by ???    Cobra 148-gtldx modified by ???  Icon_minitimeWed Feb 24, 2021 3:56 pm

Thanks for that Victor.
It was the copper clad board that i thought somebody mit recognise as not often used well i have not seen much.
Anyway the faceplate was a bit of a challenge as it needed some fettling with a set of small files but an hour later here it is.
Go on point out the bad bit's my eyes can't see very well lol.Cobra 148-gtldx modified by ???  Cobra_10

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Victor
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Cobra 148-gtldx modified by ???  Empty
PostSubject: Re: Cobra 148-gtldx modified by ???    Cobra 148-gtldx modified by ???  Icon_minitimeWed Feb 24, 2021 4:29 pm

Nice job Alan. Looking good.👍

I'd be inclined to keep it myself mate!! Smile


Go on - 're-cap' the bugger and ruin that lovely PCB! Anyone who is anyone knows that you have to 're-cap' radios....pffft! 

Ha! Ha! Very Happy
Just joking Alan, don't go ruining it with all that re-capping nonsense. It's as much tosh as all that copper cladding and gobs of hot melt glue someone's already endured the old girl to.

Half tempted to work on a CB again, if it wasn't for everyone asking ridiculous money for a 'spares or repair - no returns' rip offs Wink
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Seasick
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Cobra 148-gtldx modified by ???  Empty
PostSubject: Re: Cobra 148-gtldx modified by ???    Cobra 148-gtldx modified by ???  Icon_minitimeWed Feb 24, 2021 5:51 pm

Victor wrote:
Half tempted to work on a CB again, if it wasn't for everyone asking ridiculous money for a 'spares or repair - no returns' rip offs Wink


Have a look at two websites called Freegle & Freecycle. These recycle items , for free, that one person no longer wants,  to those who can make use of it. I find they are a great way of picking up bits & pieces.
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Victor
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Cobra 148-gtldx modified by ???  Empty
PostSubject: Re: Cobra 148-gtldx modified by ???    Cobra 148-gtldx modified by ???  Icon_minitimeWed Feb 24, 2021 7:29 pm

Cheers for the suggestion Nick.

The wife suggested that some time back but after trawling through the baby clothes, dog eaten sofas, (yuck!), and second hand mattresses, (double yuck!), I sort of gave that avenue a miss. Wink

I do know sometimes stuff turns up but I'm not desperate for a rig, just be nice working on one again after successful repairs to my Yaesu and seeing what people are up to here.

Thanks again though.
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Seasick
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Cobra 148-gtldx modified by ???  Empty
PostSubject: Re: Cobra 148-gtldx modified by ???    Cobra 148-gtldx modified by ???  Icon_minitimeWed Feb 24, 2021 8:04 pm

Victor wrote:
Cheers for the suggestion Nick.

The wife suggested that some time back but after trawling through the baby clothes, dog eaten sofas, (yuck!), and second hand mattresses, (double yuck!), I sort of gave that avenue a miss. Wink


You can post requests on there too. CB's are the sort of things that people have laying in the corners of cupboards & garages etc.
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John123
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Cobra 148-gtldx modified by ???  Empty
PostSubject: Re: Cobra 148-gtldx modified by ???    Cobra 148-gtldx modified by ???  Icon_minitimeWed Feb 24, 2021 11:23 pm

Nice radio, Alan.👍😎

I still have a Cobra 148gtl dx and its brother the Superstar 360fm.👍
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Alan Pilot
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Cobra 148-gtldx modified by ???  Empty
PostSubject: Re: Cobra 148-gtldx modified by ???    Cobra 148-gtldx modified by ???  Icon_minitimeThu Feb 25, 2021 7:59 am

Thanks John.
The radio is in really good condition but want to know where it goes.
Did think of taking the mods off but not sure on that but waiting for a counter now so i can see what is what.
One of the switches on the back is a 3 position job the other just 2.
The SWR switch is also in use for some mod and then the 5 position band select ?????.

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Alan Pilot
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Cobra 148-gtldx modified by ???  Empty
PostSubject: Re: Cobra 148-gtldx modified by ???    Cobra 148-gtldx modified by ???  Icon_minitimeThu Feb 25, 2021 8:46 pm

Would you believe it i have found the previous owner.
Been in contact with him and now it's s/low to s/high.
I found it in a picture in an advert for another radio on ebay.
What are the chances of that.
https://www.ebay.co.uk/itm/203289252983?ul_noapp=true

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Equipment Used : Optima, Superstar 360fm, Stalker 9fdx, President Jack
Age : 47

Cobra 148-gtldx modified by ???  Empty
PostSubject: Re: Cobra 148-gtldx modified by ???    Cobra 148-gtldx modified by ???  Icon_minitimeThu Feb 25, 2021 10:49 pm

Good stuff, Alan.👍 I have a real soft spot for these classic radios and enjoy using them too.👍😎
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PostSubject: Re: Cobra 148-gtldx modified by ???    Cobra 148-gtldx modified by ???  Icon_minitime

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