Electronics > RF, Microwave, Ham Radio

CB and Ham Radio Techs Love Their Bird Wattmeters

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xrunner:
Started to try my hand at making up some semi-rigid with SMAs. I had a small tubing cutter I used for modelling that seemed about right for cutting the coax. It worked really well. So far so good ...

joeqsmith:
You will need to test these after you make some up.  While I would check them with a depth gauge, I understand this is unpopular with hams, much like torque wrenches.  So here is W8JI to the rescue to show you how to properly test them.   

xrunner:
Well ... I don't have the measurement rig that you have. However, I did obtain the SMA male dimensions shown in the attached files (https://www.rfconnector.com/rf-connector-dimensions)

I can measure the depth "E", which can be Min=2.54, Max=3.43 (mm)

The center pin can protrude according to dimension "H", Min=1.91, Max=2.54 (mm)

Note: The center pins that came with my SMA males have a sharp point not a blunt point like the picture.

Thus, "E" can be a minimum of 2.54 mm, and "H" can be a Max of 2.54 mm. Therefore, to wit, the end of the pin can align exactly with the edge of the SMA Male and it would satisfy the dimension tolerances.

 :popcorn:

metrologist:
Analog Dial indicators. I love them. I have dozens in all manner with a myriad of mounts. A great late 1800's technology that I've been using for decades. Get you some!

A.Z.:

--- Quote from: joeqsmith on September 27, 2023, 03:16:10 pm ---Let's see what the hammer damners say.

This one claims there is no measurable difference:
https://www.iz2uuf.net/wp/index.php/2016/01/08/pl-259-vs-n-on-430-mhz/


--- End quote ---

Read the SECOND part, don't stop at the front door

https://www.iz2uuf.net/wp/index.php/2016/01/15/pl-259-vs-n-round-2-hard-testing/

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