tag:blogger.com,1999:blog-7590176649168185428.post4045334569659536967..comments2024-03-28T18:51:21.655-04:00Comments on SolderSmoke Daily News: YAMMM! Yet Another Michigan Mighty Mite! From KC0ZIR in Northern VirginiaBill Mearahttp://www.blogger.com/profile/07662500663603350847noreply@blogger.comBlogger2125tag:blogger.com,1999:blog-7590176649168185428.post-70228260547991201252016-01-13T05:51:12.890-05:002016-01-13T05:51:12.890-05:00Chip,
I just noticed this ended up on the blog, th...Chip,<br />I just noticed this ended up on the blog, thanks for the reply! I've been reading about impedance [1] while studying for my general. I didn't realize that impedance was the hypotenuse of a right triangle with resistance and reactance legs.<br /><br />The way I'm thinking about impedance matching now, it makes sense to me that the impedance of the antenna and of the radio should match. If I have a simple circuit with a voltage source and two resistors in parallel, and the resistors are of the same value, the voltage drop and current should be the same across both of the resistors. With impedance, if the impedance is mismatched, the power will not be equal between the radio circuit and the antenna.<br /><br />-Dan, KC0ZIR<br /><br />[1] http://www.phy.davidson.edu/instrumentation/Files/NEETS/Mod02%20-%20AC%20and%20Transformers.pdfdwhttps://www.blogger.com/profile/07815716445556381098noreply@blogger.comtag:blogger.com,1999:blog-7590176649168185428.post-57062694249508003812015-12-14T11:04:49.411-05:002015-12-14T11:04:49.411-05:00Hoping Dan reads this. Coax impedance is set by t...Hoping Dan reads this. Coax impedance is set by the ratio of the diameter of the center conductor to the diameter of the shield. It is the resistance you would measure if you had an infinite length of the cable and measured with an AC signal. Most folks just take the manufacturer's word for it. For most ham purposes 50 and 70 ohm cable are interchangeable. This means you can get some bargains on cable intended for CATV.<br /><br />Chip v.Anonymousnoreply@blogger.com