hi all.
does any body know how long you can transmitt on a mobile bc radio?
can they transmitt for long periods say 5 mins?
how long can you transmitt on a uhf cb mobile in one trans?
-
- Moderator
- Posts: 3746
- Joined: Sun Feb 18, 2007 5:41 pm
- Amateur callsign: VK6FWDH
- Scanners and Receivers: UBC93XLT
- Location: Helena Valley
- Contact:
Wouldn't have thought it would be good for it to transfer that long, I know with our SES radios it'll stop transmitting after 30-45 seconds.
Stirling SES
Team Leader (Stirling 53)
Vertical Rescue Team Member
K9 7 Support
VK6FWDH
ex-Darlington FB
WARSUG Demi-God I mean Mod
If stupidity got me into this mess, why can't it get me out.
Team Leader (Stirling 53)
Vertical Rescue Team Member
K9 7 Support
VK6FWDH
ex-Darlington FB
WARSUG Demi-God I mean Mod
If stupidity got me into this mess, why can't it get me out.
-
- Banned
- Posts: 485
- Joined: Mon Jul 24, 2006 4:37 pm
What is it that you actually want to know? What is the legal length of a long transmission on a public cb channel, or is it an equipment question (programming commercial radios gives you the option of the tx timing out after a selected amount of time or not at all - for example the tv and radio stations who use two ways to transmit IFB to outside broadcasts often transmit for hours at a time on (private) UHF frequencies..).
I guess each manufacturer of public cb units can choose a tx time out or not....
I guess each manufacturer of public cb units can choose a tx time out or not....
-
- Site Admin
- Posts: 2610
- Joined: Thu Feb 24, 2005 10:33 pm
- Amateur callsign: VK6HGR
- Scanners and Receivers: Various Yaesu, Kenwood, Tait, Simoco and Philips'
- Location: Perth, Western Australia
- Contact:
Most mobile/base UHF CBs have no heatsink and I wouldn't risk transmitting for more than a few minutes to keep from excessively heating and damaging the final output (PA) transistors. Most radios have thermistors which will wind back the output power to protect the PA, but the circuit isn't always quick enough
Commercial rated transceivers like the Icom IC-400PRO, Philips FM-92 etc could transmit at 5W for much longer - even indefinitely.
Commercial rated transceivers like the Icom IC-400PRO, Philips FM-92 etc could transmit at 5W for much longer - even indefinitely.
Last edited by vk6hgr on Sat Jan 19, 2008 4:59 pm, edited 1 time in total.
Gavin Rogers; VK6HGR
http://vk6hgr.ampr.org/
WARSUG forum administrator
Site and stream donations: https://www.paypal.me/vk6hgr
http://vk6hgr.ampr.org/
WARSUG forum administrator
Site and stream donations: https://www.paypal.me/vk6hgr
-
- 150+ posts
- Posts: 662
- Joined: Thu Dec 07, 2006 7:04 pm
- Scanners and Receivers: Yaesu FT-857 Yaesu FT7800 Icom ID800H
- Location: Perth
- Contact:
transistoids(those big transistors) or transisters?vk6hgr wrote:Most mobile/base UHF CBs have no heatsink and I wouldn't risk transmitting for more than a few minutes to keep from excessively heating and damaging the final output (PA) transistors.
Commercial rated transceivers like the Icom IC-400PRO, Philips FM-92 etc could transmit at 5W for much longer - even indefinitely.
Re: how long can you transmitt on a uhf cb mobile in one tra
It all depends how long the timeout on the radio lasts for. Some radios have timeouts like the tait i think its a minute 10 seconds or something. Where as a Uniden 088 will drop a continuous carryer. All depends on the 'timeout' on the radio. After you have transmitted for the ammount of time that the radios timeout goes for your transmition will be cut off and you'll have to key up again.slipknot wrote:hi all.
does any body know how long you can transmitt on a mobile bc radio?
can they transmitt for long periods say 5 mins?
[PRC] Perth Radio Club. 495
-
- Site Admin
- Posts: 2610
- Joined: Thu Feb 24, 2005 10:33 pm
- Amateur callsign: VK6HGR
- Scanners and Receivers: Various Yaesu, Kenwood, Tait, Simoco and Philips'
- Location: Perth, Western Australia
- Contact:
Re: how long can you transmitt on a uhf cb mobile in one tra
For the Tait, the timeout time depends completely on the programming.PRC-495 wrote: It all depends how long the timeout on the radio lasts for. Some radios have timeouts like the tait i think its a minute 10 seconds or something.
Gavin Rogers; VK6HGR
http://vk6hgr.ampr.org/
WARSUG forum administrator
Site and stream donations: https://www.paypal.me/vk6hgr
http://vk6hgr.ampr.org/
WARSUG forum administrator
Site and stream donations: https://www.paypal.me/vk6hgr