Electronics > RF, Microwave, Ham Radio

CB and Ham Radio Techs Love Their Bird Wattmeters

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vk6zgo:

--- Quote from: joeqsmith on December 12, 2023, 06:57:40 pm ---Video demonstrating using attenuators for a load.  Rather than a VNA, he uses a scope with TDR.  Warning,  I cringed a lot during the video.....



--- End quote ---

Yes, he does rather like screwing them on the wrong way---that's why I like "N" connectors---you have to be pretty brutal to hurt them.
The information is good, but he "waffles on a lot" to get it over.

In the field it is often necessary to present the test equipment or DUT with a reasonably correct load, so if someone forgot to return the load to the equipment box or "cooked" it, & you are several thousand km from home, it is nice to be able to get quite close to a calibration load accuracy with two 40dB pads in cascade.

Another scenario is if you are working at a company which is quite poor (or miserly) where you may not have a calibration load & need something to "Second think" the Bird test load specs.

metrologist:

--- Quote from: vk6zgo on December 12, 2023, 11:33:41 pm ---Yes, he does rather like screwing them on the wrong way---that's why I like "N" connectors---you have to be pretty brutal to hurt them.

--- End quote ---

You are not supposed to rotate the body, doing it that way wears out the center conductors, rotate the nut instead.

joeqsmith:

--- Quote from: metrologist on December 15, 2023, 06:09:59 pm ---
--- Quote from: vk6zgo on December 12, 2023, 11:33:41 pm ---Yes, he does rather like screwing them on the wrong way---that's why I like "N" connectors---you have to be pretty brutal to hurt them.

--- End quote ---

You are not supposed to rotate the body, doing it that way wears out the center conductors, rotate the nut instead.

--- End quote ---

It can do a lot more than wear out the parts, it can easily damage them. 

https://www.microwaves101.com/encyclopedias/how-to-not-trash-a-calibration-kit

metrologist:

--- Quote from: joeqsmith on December 15, 2023, 08:51:11 pm ---
--- Quote from: metrologist on December 15, 2023, 06:09:59 pm ---
--- Quote from: vk6zgo on December 12, 2023, 11:33:41 pm ---Yes, he does rather like screwing them on the wrong way---that's why I like "N" connectors---you have to be pretty brutal to hurt them.

--- End quote ---

You are not supposed to rotate the body, doing it that way wears out the center conductors, rotate the nut instead.

--- End quote ---

It can do a lot more than wear out the parts, it can easily damage them. 

https://www.microwaves101.com/encyclopedias/how-to-not-trash-a-calibration-kit

--- End quote ---

That's great. I try to learn something new every day.

"Mayor McCheese:
Once an ad campaign for junk food, now the perfect nickname for your boss, especially if he is a big sloppy eater. Note the resemblance? BTW, Mayor McCheese is all over the internet, including a parody of "Me and Bobby McGee"... "nugget's just another word, for no meat left to use...""

And there are a lot of ways to damage these components. Other than bent pins from ham fisting them together, we often see signs of over torque and cross threading. Nobody likes a cross threader  :P

This is not recommended:
"A handy RF connector wrench is made by grinding (on a bench grinder) down the jaws of a small crescent wrench thin enough that it can grasp the flat on a SMA barrel."

We give away a half-dollar size stainless disc with notches cut around the perimiter for a handy RF connector wrench. The open end wrenches are not a good idea either.

xrunner:

--- Quote from: joeqsmith on December 15, 2023, 08:51:11 pm ---
--- Quote from: metrologist on December 15, 2023, 06:09:59 pm ---
--- Quote from: vk6zgo on December 12, 2023, 11:33:41 pm ---Yes, he does rather like screwing them on the wrong way---that's why I like "N" connectors---you have to be pretty brutal to hurt them.

--- End quote ---

You are not supposed to rotate the body, doing it that way wears out the center conductors, rotate the nut instead.

--- End quote ---

It can do a lot more than wear out the parts, it can easily damage them. 

https://www.microwaves101.com/encyclopedias/how-to-not-trash-a-calibration-kit

--- End quote ---

If you do it like that you're screwed!  :-DD  :palm:  :clap:

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