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UHF ???
Posted: Tue Oct 09, 2007 7:30 am
by mud80
how do i find out more info for uhf repeaters in vic?- dargo/high country
want to plan a trip with bikes and 4wds and need to find the best chanel to use?
Posted: Tue Oct 09, 2007 8:04 am
by RN
Posted: Tue Oct 09, 2007 8:04 am
by MUD EMPIRE
Vic high country is not UHF friendly. Repeaters can be tripped at only some of the 'high points'. There's a repeater at Foster and one at Wangaratta.......If you're on Buller or Hotham you'll get something, but it's all so unreliable.
Best for distance in high country is sideband AM. If you have a sideband set with decent wattage you'll be able to communicate even if your at the bottom of a valley in rough terrain. ie. UHF's hate trees and valleys.......
The basic radio rule....Hight is might
Posted: Tue Oct 09, 2007 4:48 pm
by Wish I had coils
from memory i could get channel 1 reapeter near buller but that was about it dropped out shortley after
Posted: Tue Oct 09, 2007 6:34 pm
by longlux
Posted: Wed Oct 10, 2007 2:50 am
by mud80
Thanks all
Posted: Wed Oct 10, 2007 5:09 am
by j-top paj
MUD EMPIRE wrote:sideband AM
i thought it was AM or LSB or USB or FM or CW
why does everyone call 27dregs "AM" all the time?
Posted: Wed Oct 10, 2007 3:18 pm
by BASSYK
j-top paj wrote:MUD EMPIRE wrote:sideband AM
i thought it was AM or LSB or USB or FM or CW
why does everyone call 27dregs "AM" all the time?
cos 27Megs uses "AM'
UHF uses FM
see definition of "Amplitude Modulation" and "Frequency Modulation"
Posted: Wed Oct 10, 2007 3:48 pm
by j-top paj
BASSYK wrote:j-top paj wrote:MUD EMPIRE wrote:sideband AM
i thought it was AM or LSB or USB or FM or CW
why does everyone call 27dregs "AM" all the time?
cos 27Megs uses "AM'
UHF uses FM
see definition of "Amplitude Modulation" and "Frequency Modulation"
so i cant transmitt FM on 27dregs?
Posted: Wed Oct 10, 2007 4:02 pm
by festy
Not legally - but yes, there is FM activity on 27MHz.
AM is actually 'AM double sideband', SSB is 'AM single sideband suppressed carrier'
Posted: Wed Oct 10, 2007 7:09 pm
by j-top paj
what i meant was everyone commonly refers to 27dregs as "AM" rather than HF cb.
if everyone calls UHF cb that then why not call HF what it actually is?
to me it just sounds so odd
Posted: Wed Oct 10, 2007 9:28 pm
by Goatse.AJ
Get a ham license
120watts legally and plenty of repeaters...
Posted: Wed Oct 10, 2007 10:03 pm
by -Scott-
festy wrote:Not legally - but yes, there is FM activity on 27MHz.
AM is actually 'AM double sideband', SSB is 'AM single sideband suppressed carrier'
Interesting. I've always interpreted "AM" to imply both sidebands are present on a full carrier. Anything else should be specified.
j-top paj wrote:what i meant was everyone commonly refers to 27dregs as "AM" rather than HF cb.
if everyone calls UHF cb that then why not call HF what it actually is?
to me it just sounds so odd
It's convention. Citizen Band in Oz started with the 27MHz AM/SSB sets, and later we got the 477MHz UHF stuff - all power limited.
The term HF is also commonly applied to the "RFDS style" transceivers which operate with 100W plus - no license required if you subscribe to one of the "services" available.
Posted: Wed Oct 10, 2007 10:04 pm
by j-top paj
AJFeroza wrote:Get a ham license
got one
vk2*** second op 
Posted: Thu Oct 11, 2007 6:18 am
by hzj75
check out this site it is always updated...
http://www.tropinet.com/uhf-repeaters
Posted: Thu Oct 11, 2007 6:22 am
by hzj75
Just a quick note this site is not updated and alot of repeaters that are on here have been pulled out of service long ago
Posted: Thu Oct 11, 2007 6:26 am
by hzj75
this site is the same as the telsat site and is way out of wack..
Posted: Thu Oct 11, 2007 9:12 am
by longlux
hzj75 wrote:
this site is the same as the telsat site and is way out of wack..
It seems to have the same site you posted
http://oztravelers.6.forumer.com/viewtopic.php?t=38
Posted: Thu Oct 11, 2007 10:28 am
by festy
-Scott- wrote:festy wrote:Not legally - but yes, there is FM activity on 27MHz.
AM is actually 'AM double sideband', SSB is 'AM single sideband suppressed carrier'
Interesting. I've always interpreted "AM" to imply both sidebands are present on a full carrier. Anything else should be specified..
AM is just the modulation method - amplitude modulation, i.e. the waveform is modulated by varying the height of the wave (y axis of the waveform), FM is frequency modulation, whereby the wave is modulated by varying the frequency, or x axis of the wave.
An AM DSB (A3E designation for voice telephony) transmission has the signal (i.e. voice) 'encoded' into the carrier, with both sidebands in tact.
A typical SSB transmission then takes this and suppresses one of the sidebands (the upper in the case of LSB) and also suppresses the carrier, leaving pretty much only a single sideband in tact in the transmission. This is designates a J3E transmission.
There are other AM modes in use too - Vestigal sideband is used in TV transmissions (C2F?), as well as independent sidebands and variable carrier.
Then there's other forms of modulation like Pulse modulation (PM), but that *really* has no relevence in this thread
73 de vk2***