Electronics > RF, Microwave, Ham Radio

CB and Ham Radio Techs Love Their Bird Wattmeters

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xrunner:
Been busy but I worked some on the case, which will be sitting vertically. I'm using a blue I2C 128 x 32 pixel OLED display. This will simply be a blue bar indicating the changing amount of power detected from the WiFi antennas.

The common notation of the size of this OLED which you find on various stores is "0.91 inch OLED". Not sure why they want to use inches instead of mm, but the actual size of the pixel field is 23 mm (0.91") x 6 mm.

Yes well, that's all fine and dandy, but there's a couple of cute choices the people who make this part chose. First, there are no mounting holes, tabs, or pins at all. The PCB could have been made larger to provide them (like other OLEDS) but no, we'll leave that issue to the customer to figure out. We really don't care about helping them in this respect.

Second, it woulda been nice if you could have assumed that the OLED pixel field would be centered both horz. and vert. on the PCB. Then if you designed a nice front plate with a window opening for the OLED display, the PCB would also be centered around that as well, thus making it easier to do.

However, the makers of this part decided that it would be better to give the buyers a challenge. Let's stick the OLED display to the PCB off-center under the glass (but not say how much), just enough to make them work harder to get it mounted properly. So you find out you have to light up the whole display and make little fiddly measurements and find out how much to off-center your mounting hole to get it to look right. You can see what I had to do in the picture. I really want to thank them for giving me a challenge at no additional cost.

I printed the front panel in a tan PLA I had which came from Atomic filament. It almost perfectly matches the tan paint already on this case. I'm just going to put some dots of tacky glue to hold the OLED in place, with possibly a small crossbar beam across it also.

joeqsmith:
Homemade aerial current / reflected power meter.   

xrunner:
I don't know if it works, but he's got the caution and warning labels all taken care of.  :-+

A.Z.:
Revamping this just for a pic :D

xrunner:
Ah I see - he has three birds.  :-DD

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