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Test Equipment Anonymous (TEA) group therapy thread

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BravoV:

--- Quote from: Specmaster on June 02, 2018, 01:48:47 pm ---Well the point is that if you can get a working CRO for a few quids, then thats the way to learn surely and then if they ultimately fuck it up, its just a few quid down the drain rather a few hundred. Better to make your noob mistakes on a cheap piece of equipment rather than making those mistakes become expensive ones. Once your relatively with an old CRO, upgrade to a DSO entry level one or maybe slightly better when you have a better appreciation of what they are and how to use them correctly.

--- End quote ---

The reason is always they're dirt cheap ... yeah , but you will have to wait, lurk, stalk for good deal, maybe days, weeks or even months.

Also ALWAYS judging that every beginners will 100% and definitely screwed & toasted their 1st scope, and better buy cheap sacrificial one is not a strong argument, c'mon, you have to admit this one is pretty weak.

Specmaster:

--- Quote from: bd139 on June 02, 2018, 01:53:35 pm ---
Only if you know it works. Most of the scopes I’ve sold so far have gone to beginners who want something that works correctly and has some after care. It’s quite difficult to find a trustworthy analogue scope.

--- End quote ---

Same here, most experienced and more involved users would want something a bit better than what I'd call a beginners scope, in fact I'm on the point of selling one of mine to a beginner now and it has the good attributes for a beginner even if it should fail, its still available to buy new so spares are available and it has a linear power supply so its easier to repair.  :-+

I'm already eyeing up a replacement for it, Philips 33xx series.

BravoV:

--- Quote from: bd139 on June 02, 2018, 01:53:35 pm ---
--- Quote from: BravoV on June 02, 2018, 01:22:28 pm ---Folks, as I'm a noob when it comes to RF cable,  this should be decent right ? :-//

Just bought 50 meters of RG8 equivalent, coaxial for my GPSDO antenna, Leoni brand.


--- End quote ---

Should be fine. RG8 is usually specified up to about 2.2GHz. It will have loss and this is significant at 1.5GHz so keep the run as short as possible. Sod terminating RG8 like that on anything other than N/PL259 though. I’d probably have used RG174 and lost a few dB to be lazy :)

--- End quote ---

Thanks, according to the datasheet, at GPS L1 freq return loss is about 20 dB, and with attenuation max at GPS frequency is 20dB/100 meter, my installation probably only needs about 30 meters or maybe less.

Also the antenna LNA gain is about 40 dB for the GPS signal.

med6753:
I've worked on this for several hours and I find myself getting a little aggravated so it's time to stop and pick up on it later. I had to pull the DM44 to get it out of the way. The Vertical Board itself is free in the back and I'm slowly working towards the front. I will be pulling and labeling all the coax. And there's at least two other wires that will have to be unsoldered in addition to the delay line. On the front panel I have everything pulled except the shaft for the Channel 2 variable pot. The allen key isn't long enough to reach down to the set screw so I'll have to be real careful when I pull the board out so as to not break that shaft. I have a few questions....

Do the BNC's pull WITH the board or will I have to unsolder them?

I assume the Vertical Mode switch board behind this board pull as one unit, correct?

Right now I think it's 50/50 that I'll ever get this back together in one piece. But I'm not giving up.

Specmaster:

--- Quote from: BravoV on June 02, 2018, 01:55:06 pm ---
--- Quote from: Specmaster on June 02, 2018, 01:48:47 pm ---Well the point is that if you can get a working CRO for a few quids, then thats the way to learn surely and then if they ultimately fuck it up, its just a few quid down the drain rather a few hundred. Better to make your noob mistakes on a cheap piece of equipment rather than making those mistakes become expensive ones. Once your relatively with an old CRO, upgrade to a DSO entry level one or maybe slightly better when you have a better appreciation of what they are and how to use them correctly.

--- End quote ---

The reason is always they're dirt cheap ... yeah , but you will have to wait, lurk, stalk for good deal, maybe days, weeks or even months.

Also ALWAYS judging that every beginners will 100% and definitely screwed & toasted their 1st scope, and better buy cheap sacrificial one is not a strong argument, c'mon, you have to admit this one is pretty weak.

--- End quote ---
Totally disagree, its not a weak argument, so your saying that Dave's advice is also flawed in the same way, he has done a series of scope videos showing how to connect them without blowing the arse out of them which is a typically a thing a beginner might do. I'm not saying that someone a bit more experienced wouldn't to, hell we can all screw up from time to time.

I liken it to just passing your driving test and we all know that does not mean that your a safe driver at all, just means that on the day you reached the required standard for a pass. Once passed would rush off out and secure your that Aston Martin DB8 and probably kill yourself (assuming an insurance company would take you on with such little experience, or buy something more suitable first to gain experience and demonstrate to everyone that you can actually handle a car correctly and not be a hazard to others? That's probably not the best example but you should see the logic in it.

Clearly it would be nonsensical to suggest to somelike bd139 to buy themselves a cheap CRO first when he clearly understands what he is doing, although he has been known to blow things up occasionally  :-DD

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