Home |
Search |
Today's Posts |
|
#1
|
|||
|
|||
Identification Question
"KC4UAI" wrote in message ... I was looking for a graphic of the US Ham Bands that included the ARRL band plan to replace the out of date posters in the club's shack. I went to looking around and found a few neat looking PDF files but I couldn't find a poster that has both the Part 97.301 and the ARRL band plan in graphical form. I couldn't find what I wanted, so in true ham radio style I started to develop one of my own. While I was digging though part 97.301 and the ITU band plans I came up with an unanswered question. In Part 97.301, only 60 Meters is specified to be USB. The rest of the bands can legally be used with either USB or LSB when using SSB phone. I figured that the ARRL's band plan would specify USB or LSB for the band, but they don't, at least in the tables I found. I understand that there is a convention born of convenience when SSB was just getting started. Apparently it was easier to build multi- band rigs for SSB that did upper and lower side band on various bands when this all got started but most of us don't build our rigs today. Where can I find out what the convention here is for 160, 80, 40, 20, 17, 15, 12, 10, 6, 2 (and up) SSB phone operation? Thanks! -= bob =- Extracted from the fcc question pool -- see google for "usb lsb convention" get a pdf file "Technician Study Sheet" sez Radio Modes The simplest radio signal is just a single frequency. By turning that radio wave on and off, it's possible to send morse code (CW). Amplitude Modulation is the simplest voice modulation scheme but it's not very efficient because it has two identical (redundant) sidebands with the voice information and the radio carrier that doesn't contain any information. Amateur radios often use Single Sideband (SSB) transmissions that are spectrally (space) and power efficient by removing one of the AM sidebands and the carrier before transmission. This leaves either the upper or lower sideband (USB/LSB). Convention dictates that lower sideband (LSB) signals are used below 10MHz and upper sideband (USB) is used above 10MHz. 60M as you pointed out is USB Lamont |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Rig Identification | Swap | |||
Antenna Identification question... | Scanner | |||
BK-100 Bug Identification | Equipment | |||
BK-100 Bug Identification | Equipment |