PRC-77

the PRC doesn't stand for anything.

the PRC-77 (and the improved PRC-770) are military VHF FM transcievers, that have been used sence 1960, and are slowly being phased out because the US Army likes them.

Frequency Coverage:
30.0000 to 76.0000 MHz
channel spacing:
50 kHz
channels:
920
Power Output:
5 watts
Range:
10 miles on a bad day
5 miles when the VC are shooting at you
30 miles when you get back to base

PRC-77s are used as manpack radios (straped to the back of GIs and used for unit-to-unit communications), if you've ever seen the movie "Platoon", the PRC-77 is the radio that all the Americans are carrying on thier backs.
or they are installed as radios in Humvees and tanks. (i.e. all the antennas on military viecles are connected to PRC-77s.

widly copied by every NATO member, so all the good guys can talk to each other.

"Roger, get the PRC-77 on 41.75 and call HQ"

by IrishRepublicanArmy October 21, 2003

document

to document is to write something down

I cannot beleive i am writing this definition.

by IrishRepublicanArmy December 20, 2003

DX-959

It is nothing more then a DX-949 with a frequency and channel readout.

Use 27.555 MHz for international freeband calling.

by IrishRepublicanArmy December 20, 2003

AM

Amplitude Modulation

a way of applying information (voice or music) to a radio signal, beaten by SSB and then FM.

also: the old broadcast band from 530 to 1710 kHz.

"nobody listens to AM anymore"

by IrishRepublicanArmy October 12, 2003

VHF

1) The Very High Frequency communcations band from 26.985 to 174 MHz or 30 to 300 MHz, the most popular local (less then 200 mile range) communication band

2) the VHF-AM civilian aircraft communcation band 118 to 137 MHz
see UHF

"Roger, we got you on VHF 122.9"

by IrishRepublicanArmy October 13, 2003

spread spectrum

A signal struc­turing tech­nique that employs direct se­quence, frequency hopping or a hybrid of these, which can be used for multiple access and/or multiple func­tions. This technique decreases the potential interfer­ence to other receivers while achieving privacy and increasing the immunity of spread spec­trum receivers to noise and interference. Spread spec­trum generally makes use of a sequential noise­‑like signal structure to spread the normally narrow­band informa­tion signal over a relatively wide band of frequencies. The receiver corre­lates the signals to retrieve the origi­nal informa­tion signal (NTIA)

Normal scanners cannot get spread spectrum transmissions.

by IRISHrepublicanARMY January 03, 2004

calibrate

To find calibre the (caliber) of; correlate readings of (instrument etc) with a standard or commonly accepted value.

I calibrated my HF reciever with the 10.0000 MHz WWV/WWVB frequency standard.

by IrishRepublicanArmy December 26, 2003