Call Search
     

New to Ham Radio?
My Profile

Community
Articles
Forums
News
Reviews
Friends Remembered
Strays
Survey Question

Operating
Contesting
DX Cluster Spots
Propagation

Resources
Calendar
Classifieds
Ham Exams
Ham Links
List Archives
News Articles
Product Reviews
QSL Managers

Site Info
eHam Help (FAQ)
Support the site
The eHam Team
Advertising Info
Vision Statement
About eHam.net

   Home   Help Search  
Pages: [1]   Go Down
  Print  
Author Topic: Can Yaesu VX-5R be used with 13.8volts?  (Read 461 times)
VK3
Member

Posts: 5




Ignore
« on: December 08, 2001, 02:00:02 AM »

Can the vx-5r be operated from a 13.8volt source without incurring damage to the HT?  Have heard that the radio heats up during TX and causes damage.  Is this a design fault?  I would aprreciate any suggestions from owners of the unit.  73's Dan
Logged
KC8AXJ
Member

Posts: 303




Ignore
« Reply #1 on: December 08, 2001, 05:08:52 PM »

According to Yaesu's spec.s:

 http://www.yaesu.com/amateur/vx5rtx.html

Supply Voltage: Nominal:  7.2 V DC, Negative Ground
Operating:  4-9 V DC (Internal Battery)  
10-16 V DC, Negative Ground  (EXT DC jack)

Handhelds, because of a lot of power options i.e. car battery, attached batteries of verious voltage, are desined to work without a "set" voltage. The only trade off is power out. Less power in.......less out.


I have a Icom T22 Which will put out 5 watts from a external sorce (13.8V) or it's 7.2V ni-cad.
If I do a lot of transmitting, it does get quite warm.
(Nice in the winter, Hi Hi)
The body of these things aren't that big as far as being a "heat sink". My mobile will even ge a LITTLE warm at 5 w out and that is quite a lot more iron than a handheld.
I wouldn't worrie about it too much, just try not to key up for long periods, even 15-20 seconds at a time can add up heat wise.
These things aren't really a good rag chewing device unless you can run on the low power setting.
Hope that helps!
73
Steve   kc8axj@arrl.net
Logged
KC0IWV
Member

Posts: 24




Ignore
« Reply #2 on: January 28, 2002, 06:23:45 PM »

According to Yaesu you should be able to use a 13V source for this HT.  I own one myself and have used it in the car off of the battery.  It does dissipate a lot more heat.  I asked the technician at Yaesu about this and he said it is designed to handle 12V+ but will need to dissipate a lot more heat.  

I personally don't use mine this way - the unit gets hot enough with 7.2V input that I'm suspect that 13 Volts might not be the best thing for the rig.  

However, I know a lot of Hams who do run them off the car battery and have had no problems.  

So the answer to your question is yes.  
Logged
Pages: [1]   Go Up
  Print  
 
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.11 | SMF © 2006-2009, Simple Machines LLC Valid XHTML 1.0! Valid CSS!