Wireless: More Ch 4

Jerry's been yakkin quite a bit.  Showed us some different types of antennas in class.

Reviewed pictures/graphs showing filters and what is blocked. 

Wavelength (meters)( λ) = 300/F MHz - remember this, it'll be on the test and used.  

Extra Credit ops-              Ham Fest in Severville 9/29 50points

                                        LOPSA meeting 10/2 30points

Digressions links, unsure where they fit in, but looks important.
Dipole Antennas

Cell Phone Booster

Notes from class (such as it is) after the break.

Wireless: Ch 4 cont.

Short one today, as we had a test and Jerry talked quite a bit on unrelated stuff.  Also, sorry about the format, the keyboard I had was sticky and I could not type well, I had to copy/paste from the powerpoint slides. 

Antenna Characteristics

Types, sizes and shapes

Passive antennas

–The most common type

–Constructed of a piece of metal, wire, or similar conductive material

–Does not amplify the signal in any way

–Directional gain

•Passive antennas radiate the RF energy supplied by the transmitter in one direction

•Exhibits an effective gain that is similar to amplification of the signal

Wireless: Chapter 3, Radio Communications

Filters removes unwanted F signals.  RF filter either passes or rejects a signal based on frequency.  There are three basic types of filters; low-pass, high-pass and bandpass filters.  Low pass blocks the high, lets the low through, high blocks low and keeps high.  The bandpass sets a range called a passband, which has a min and max threshold.