Test Equipment Anonymous (TEA) group therapy thread

[tautech]

Talking of GPS I think I (or my youngest) killed my QRP Labs GPS module. It's not responding now. Was sitting there on the window sill. There was a two hour opportunity where my youngest may have got at it but I couldn't see any finger prints on the board!

Haven't replied to any of the GPS antenna posts yet but have been reading them. I'm looking at permanent antenna options as well so this thread is interesting 

Oh c'mon, that's not fair blaming the kids ! The littlest one at that !

Or is penis fingers not wanting to own up ? 

The face and spit marks on the window next to it are a clue

Despite drinking half a keg the other day I don’t remember doing that.

Sounds like those PF genes are being passed on. 

[tggzzz]

Still a little puzzled about this seeing as the only 50 ohm inputs I have are the TF930 and the HP1740A which is switchable between 50ohm and 1M, all the other scopes tend to be 1M and also of course the TF930 can also be switched between 1M and 50ohm. If IIRC the only time the 50ohm input on the 1740A gets mentioned really is on some specific calibration tests?

The excellent "low" impedance Z0 "resistive divider" probes have to be terminated in 50ohms, as do other classes of probes.

Those are actually a higher input impedance than so-called "high" impedance *10 probes (when input capacitance is included), and have a much higher bandwidth. Examples: 1.5GHz HP10020A or 6GHz HP54006A.

Why would I be attaching probes to a signal generator?

I presumed you would be attaching the probe to the 1740, which is (when I looked 2 minutes ago) a scope.

I'm more likely am I not (unless I'm missing something) be using a a lead terminating in a BNC at one end and a pair croc clips at the other. The highest bandwidth scope I'll be using is 100MHz. I'm only using the signal generator for normal domestic radio broadcast radios between 100 KHz and 108MHz?

In that case I have little idea what you are trying to achieve.

[bd139]

Sounds like those PF genes are being passed on. 

I'm going to have to re-sign-up for the forum as user PenisFingers 

[Specmaster]

Yes I will be doing that as well, there is a dedicated output for that and another for RF. I also hook up the other sig gen to the scope at times too.

Still a little puzzled about this seeing as the only 50 ohm inputs I have are the TF930 and the HP1740A which is switchable between 50ohm and 1M, all the other scopes tend to be 1M and also of course the TF930 can also be switched between 1M and 50ohm. If IIRC the only time the 50ohm input on the 1740A gets mentioned really is on some specific calibration tests?

The excellent "low" impedance Z0 "resistive divider" probes have to be terminated in 50ohms, as do other classes of probes.

Those are actually a higher input impedance than so-called "high" impedance *10 probes (when input capacitance is included), and have a much higher bandwidth. Examples: 1.5GHz HP10020A or 6GHz HP54006A.

Why would I be attaching probes to a signal generator?

I presumed you would be attaching the probe to the 1740, which is (when I looked 2 minutes ago) a scope.

I'm more likely am I not (unless I'm missing something) be using a a lead terminating in a BNC at one end and a pair croc clips at the other. The highest bandwidth scope I'll be using is 100MHz. I'm only using the signal generator for normal domestic radio broadcast radios between 100 KHz and 108MHz?

In that case I have little idea what you are trying to achieve.

From mobile device so predictive text might have struck again [emoji83]

[Specmaster]

Still a little puzzled about this seeing as the only 50 ohm inputs I have are the TF930 and the HP1740A which is switchable between 50ohm and 1M, all the other scopes tend to be 1M and also of course the TF930 can also be switched between 1M and 50ohm. If IIRC the only time the 50ohm input on the 1740A gets mentioned really is on some specific calibration tests?

The excellent "low" impedance Z0 "resistive divider" probes have to be terminated in 50ohms, as do other classes of probes.

Those are actually a higher input impedance than so-called "high" impedance *10 probes (when input capacitance is included), and have a much higher bandwidth. Examples: 1.5GHz HP10020A or 6GHz HP54006A.

Why would I be attaching probes to a signal generator?

I presumed you would be attaching the probe to the 1740, which is (when I looked 2 minutes ago) a scope.

Yes I will be attaching a probe to the scope and that probe will generally be attached to the radio receiver at a different point to the signal generator 

[med6753]

USPS delivery yesterday. 3 boxes. What's inside them? Let's see....

Box 1: A “care package” thanks to mnementh. Contains various mainly power supply bits. Includes a few small transformers that are perfect for the 5 volt Fluke 8000A project. Thanks pal! 

Box 2: From Mouser. Parts to rebuild the 110V supply in the Tek 465. 

Box 3: Not mine. It's hers. Clothes from one of her favorite shops. As I mentioned before she has items delivered here rather than her place because of rampart package theft.

Can't wait to work on the 465 to see if it finally comes up but she's arriving this afternoon for the weekend. So it will have to wait until next week. It was a tough choice. 

[Specmaster]

Can't wait to work on the 465 to see if it finally comes up but she's arriving this afternoon for the weekend. So it will have to wait until next week. It was a tough choice. 

Well there's one disadvantage to your domestic arrangements, most of us married men would just carry on working on the 465 over the weekend 

[med6753]

Can't wait to work on the 465 to see if it finally comes up but she's arriving this afternoon for the weekend. So it will have to wait until next week. It was a tough choice. 

Well there's one disadvantage to your domestic arrangements, most of us married men would just carry on working on the 465 over the weekend 

You are so right. Oh well......

[bd139]

I would!

[Specmaster]

I definitely would be as well

[med6753]

That would go over like a giant fart in church. 

[Specmaster]

That would go over like a giant fart in church. 

Thats ok, my dad always used to say, church or chapel, let it rattle, so go for it.

[bd139]

well that's a fucker. CPC free delivery has gone up to min £8 spend now from £5 

[Specmaster]

well that's a fucker. CPC free delivery has gone up to min £8 spend now from £5 

[bd139]

Indeed. This actually stopped me putting an order through them because I needed about 4 quid of bits. So I did it via bitsbox instead and just paid the postage 

Maplin II ? 

[Specmaster]

I hope not, but this is where local parts shops should be able to score but I expect what does it in for them are the local business rates and the corporation taxes. If we aren't careful government greed will kill everything off.



Explains loads.

[bd139]

Saw that last night. That's public sector and civil servant culture in action for you. We have a no hire rule if someone has been infected by the public sector. Literally don't even get invited to an interview.

Also if there's anything I have learned, the right approach to life is: rules are only applicable if you get caught.

If you haven't watched it, one of the best films ever: https://www.imdb.com/title/tt0088846/

Trailer:

[tggzzz]

Yes I will be attaching a probe to the scope and that probe will generally be attached to the radio receiver at a different point to the signal generator 

Don't forget to include the effects of the probe's input capacitance on the UUT and measurements!

[bd139]

Good point. Scope probe will detune anything. This is one reason the 50 ohm system exists is you do measurements via substitution rather than via in circuit measurement.  The 50 ohms is a contract between blocks.

If you’re tuning a receiver with its own impedance relationships then best to signal inject and use the receiver as the test instrument (see my typical alignment process above)

[med6753]

OT....any of you folks in the UK visit the Mach Loop in Wales and watch the NATO aircraft practice low altitude flying? I've watched many of the videos on You Tube and it is something I'd like to experience. 

[tggzzz]

This is completely off topic, and of no relevance to this thread

[Specmaster]

Except thats very often very close to what our SWMBO's say when we bring home our latest acquisitions to the TEA party

[tggzzz]

OT....any of you folks in the UK visit the Mach Loop in Wales and watch the NATO aircraft practice low altitude flying? I've watched many of the videos on You Tube and it is something I'd like to experience. 

Go gliding.

I've seen airliners take off beneath me, eyeballed Hercules sufficiently close to see the small windows around the cockpit, eyeballed sheep as they whizz past at 60 mph, gazed into the eyes of raptors (red kites) as we flew alongside each other, and circled upwards with raptors (buzzards).

Besides, can we still afford to fly warplanes over the UK?

[bd139]

We like buying them. Not sure about flying them.

[mnementh]

Sounds like those PF genes are being passed on. 

I'm going to have to re-sign-up for the forum as user PenisFingers 

DEWWW EEET!!! 

*FNAAAARRRFFF!*


BTW, thank you guys for this... I've been feeling like homemade sh** (not even cheap, plain white-label generic store-bought sh**) all morning... I was in desperate need of a laugh.


mnem
*Suddenly feeling at least 20dB better*