UHF CB Radios
Submitted: Thursday, Apr 12, 2001 at 00:00
ThreadID:
179
Views:
2356
Replies:
2
FollowUps:
3
This Thread has been Archived
Narelle
I recently purchased 2 (my first ever) UFH CB radios for family use when 4WD and camping. Whilst the instruction book tells you how to set the channels up for simplex/duplex/repeater use, it doesnt describe what these terms mean or what situations to use them. The staff of where I bought it dont know either. Can anyone help? Id be really grateful as I wish to trial them out this
Easter.
Reply By: ExplorOz Team - Friday, Apr 13, 2001 at 00:00
Friday, Apr 13, 2001 at 00:00
Narelle,This is a good question and one which we will have to add to our trip preperation section. In a nut shell simplex is the mode of operation which means that you transmit and receive on the same frequency. Duplex means that you will transmit on one frequency and receive one another. OK, so what does this all mean.In most major cities and in certain rural areas repeaters have been established that allow you to talk over a greater distance (this works in duplex mode) - how this is acheived is that you talk the repeater station picks up your signal and then retransmits it on a different frequency. Hence the difference in the frequencies in duplex mode (If you transmitted and received on the same frequency you would over talk your own signal) - I hope this is making sense.Duplex mode is usually configured for channels 1 - 9 and uses channels 31-39 as the duplex frequencies. If you wish to
check for a repeater then set your radio for duplex mode on channels 1 - 9 and press the button on the mic - most repeaters will respond with a tone or noise after you release the mic key (if you hear nothing then you cannot reach a repeater). If you get a tone back then try to talk to someone you may find that you are talking to someone who is quite a way away from you. Simplex mode means that you transmit and receive without the aid of a repeater (shorter distance transmission) If you are in a group and wish to talk with each other then you will use simplex mode i.e each user will select a none duplexed channel and you will talk to each other directly on the same frequency.I hope this helps and does not confuse. Good luck (dont worry it is easy just have a go and see what you get - You will have it in no time)
AnswerID:
351
Follow Up By: Narelle - Friday, Apr 13, 2001 at 00:00
Friday, Apr 13, 2001 at 00:00
Thank you, thank you, thank you!!!
FollowupID:
69
Follow Up By: Nigel - Friday, May 04, 2001 at 00:00
Friday, May 04, 2001 at 00:00
just one point - repeaters use channels 1-8 for output and 31-38 for input. Channels 9 and 39 are not used by repeaters. Cheers and happy chatting.
FollowupID:
93
Reply By: mark Callaghan - Wednesday, Apr 18, 2001 at 00:00
Wednesday, Apr 18, 2001 at 00:00
Hi Narele
We use UFH to communicate with drivers on all of our tag-along tours as sometimes our groups spread out over several Kms. Its not uncommon to talk to someone over 80 kms away.
Some little extra on this that you may find useful
There are several channels that are used around the place
Ch 40 is used by truckies - you can find out about road conditions etc from these guys - but they do use colourful language
Ch 5 - the emergency channel - usually monitored by volunteers in major centres
Ch 6 - community channel
Just set your unit to scan and it will pick up other users in your area.
Remember that UHF is an open system and that your conversation can be heard by anyone
Now for the plug -
check out our web at
http://www.4wdadventuretours.com.au
hopefully
well see you on tour.
AnswerID:
357
Follow Up By: Narelle - Friday, Apr 20, 2001 at 00:00
Friday, Apr 20, 2001 at 00:00
Thanks for your info - I am glad you told me about Channel 40 - Ill give that one a big miss! I will also
check out your website. Thanks again.
FollowupID:
72