Electronics > RF, Microwave, Ham Radio

CB and Ham Radio Techs Love Their Bird Wattmeters

<< < (267/304) > >>

xrunner:

--- Quote from: joeqsmith on September 17, 2023, 01:26:04 am ---Looks like your board is also a bit off centered like mine was.

--- End quote ---

Yea it's obvious, but I just checked some measurements. The case is made so that the hole for the SMA part is centered left to right, OK.

But the board is the problem. The center trace for the inner conductor of the coax cable is NOT in the center of the board - it's offset. But it's close enough so that a casual glance at the board, by someone asked to make a case for it, might assume it to be centered. The trace could have been centered left to right, but it wasn't, which doesn't really affect the operation of the board.

Never assume anything. The old saying "never assume anything because it makes an ASS out of U and ME" applies.  :-DD

xrunner:
Here's how all the parts go together, at least up to this point. I'll still need to put copper tape on the inside of the case though. Now I need to work on the side vertical case risers, and the front and the back face plates. Then wire it all up, calibrate it again, and add some graphics to the basic data that I already had working. Should take me into next year at this rate.  :scared:

vk6zgo:

--- Quote from: xrunner on September 19, 2023, 12:32:12 am ---Here's how all the parts go together, at least up to this point. I'll still need to put copper tape on the inside of the case though. Now I need to work on the side vertical case risers, and the front and the back face plates. Then wire it all up, calibrate it again, and add some graphics to the basic data that I already had working. Should take me into next year at this rate.  :scared:

--- End quote ---

It already looks better than the stuff some well-known firms turn out.

xrunner:
I connected the electronics shield and breadboard I was previously using to the Due to make sure it was still functioning like I last left it (minus the inputs from the log amps). It was. Never know with a cat hanging around here.

But mainly I needed to get an idea of the size needed for the two side risers I need to 3D print. I put on a new blank shield without the headers on top to check the height. Also set on top a 3.3 V regulator but I sat it flat because I don't want it to sit high the way they installed the pins. I will remove the pins and re-install my own so it lays close to what you see. Looks like a riser of a couple cm will do the job.

I also received in the mail some RG-402 semi-rigid & male SMAs for same. This is mainly for one reason, for me to practice making these types of RF lines. After looking at Joe's project I realized I needed this knowledge myself.

But, once made, I will replace the two short coax jumpers I'm using for the DC out of the Putnam coupler. DC you ask? What are you talking about? Well, let's put it this way - "DC" as Joe defines it.

 :-DD

joeqsmith:
Looking good.  Risers are going to be an 'H' beam?   Are you planning to run the RF connectors out the sides to make it easier to place in-line? 

Navigation

[0] Message Index

[#] Next page

[*] Previous page