[Merged] Radio talk

[afrasay]

Maliit lang ang antenna ng UHF FRS band mga isang dangkal ko lang. Yun VHF 2 meter ang full wave kaya mga 2 meter band ang tawag dun. So you can just imagine ang full wave ng CB 27mhz, 22 meters (correct me if I'm wrong) and more so HF and LF band na parang kulahan ng damit. Radios using disk (as in microwave disk)are usually in the GHz freq range. And some, namely satelite communications doesn't even use coaxial cables just waveguide as in parang aluminum sqaure tubing as transmission media.

[StraightSix]

... ang full wave ng CB 27mhz, 22 meters (correct me if I'm wrong) and more so HF and LF band na parang kulahan ng damit.

27 MHz CB band is 11 meters.

And some, namely satelite communications doesn't even use coaxial cables just waveguide as in parang aluminum sqaure tubing as transmission media.

Waveguides are used on microwave frequencies because other transmission lines, like cables, have very high losses per length (attenuation) on higher frequencies. But that doesn't mean that all satellite communications are on microwave.

An example satellite is the RS-10/11 which had uplinks on 15m and downlinks on 10m ... both of these bands are on HF. And yes, coaxial cables were used for those because waveguides would be impractically huge at those frequencies.