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: Rechargables in the Kenwood TH-D72A  (Read 1257 times)
W0ALE
Member

Posts: 37




Ignore
« on: June 10, 2013, 07:41:33 AM »

So, I was hoping to get an AAA battery pack as another backup (I have a couple batteries and a DC cable already) solution for my TH-D72A.  I was looking at rechargable Eneloops (http://us.sanyo.com/Battery-Products/AAA-4-Pack-SEC-HR4U4BPN) , but then I read this in the Kenwood manual: "Do not use Manganese batteries or Rechargeable batteries in place of Alkaline batteries."

So, I guess I can't use the Eneloops?  Any idea why they say Alkaline only?  Is it the 1.2V vs the 1.5 that would cause issues?

Thanks!

WØALE
Logged
W8JX
Member

Posts: 6144




Ignore
« Reply #1 on: June 10, 2013, 08:09:37 AM »

Radio will develop less power on xmit because of reduced voltage. It will not hurt it otherwise. As far as dry cells they are prone to leak over time and can damage case.
Logged

--------------------------------------
All posted wireless using Win 8.1 RT, a Android tablet using 4G/LTE/WiFi or Sprint Note 3.
KA4POL
Member

Posts: 2040




Ignore
« Reply #2 on: June 10, 2013, 08:27:11 AM »

They leave you a choice between Lithium and Alkaline which you must select from in the menu 112.
You are loosing .3 V per battery with rechargeables. So your assumption is correct. There is a lower limit of voltage for correct operation as well as an upper limit.
It is a bit strange to say no manganese cells as alkaline batteries use manganese dioxide.
Logged
W0ALE
Member

Posts: 37




Ignore
« Reply #3 on: June 10, 2013, 10:11:45 AM »

Thanks for info. 

Anyone know what the minimum voltage needed for this radio is?
So, if I went with these and with them being Ni-MH, would you suggest I choose Lithium or Alkaline in menu 112?

Which model would you suggest? 

Eneloop - all-purpose, 1800 life cycles, 1900 mAh
Eneloop XXX - medium-to-high power consumption, 500 life cycles, 2450 mAh

Since I have a few battery packs and this would be a last resort type thing should I just get some regular Alkalines?
Logged
W8JX
Member

Posts: 6144




Ignore
« Reply #4 on: June 10, 2013, 10:19:16 AM »

if I went with these and with them being Ni-MH, would you suggest I choose Lithium or Alkaline in menu 112?

Lithium

Which model would you suggest? 

Eneloop - all-purpose, 1800 life cycles, 1900 mAh
Eneloop XXX - medium-to-high power consumption, 500 life cycles, 2450 mAh

Eneloop XXX - medium-to-high power consumption, 500 life cycles, 2450 mAh

Since I have a few battery packs and this would be a last resort type thing should I just get some regular Alkalines?

Ni Mih.  Like Lithium they will have a more stable voltage during discharge.
Logged

--------------------------------------
All posted wireless using Win 8.1 RT, a Android tablet using 4G/LTE/WiFi or Sprint Note 3.
KA4POL
Member

Posts: 2040




Ignore
« Reply #5 on: June 10, 2013, 10:57:45 AM »

You'll have to adjust menu 112 according to the batteries used so you have a good indication of charge status. So it is definitely closer to choose Lithium.
The spec says 4.5 to 10.8 V at the battery terminals.
Logged
W0ALE
Member

Posts: 37




Ignore
« Reply #6 on: June 10, 2013, 12:33:30 PM »

You'll have to adjust menu 112 according to the batteries used so you have a good indication of charge status. So it is definitely closer to choose Lithium.
The spec says 4.5 to 10.8 V at the battery terminals.

Where did you find this information? All I see in the manual is:

"Rated voltage
External power supply (DC IN) DC 12.0 ~ 16.0 V (13.8 V nominal)
Battery terminals DC 5.5 ~ 9.0 V (7.4 V nominal)"

So, to make sure I understand this...6 AAs at 1.2V give me 7.2V.  7.4V is nominal, but it'll operate anywhere from 5.5 to 9.0V.

Thanks for all this information & helping out an electronically-challenged dummy!  Grin
Logged
W8JX
Member

Posts: 6144




Ignore
« Reply #7 on: June 10, 2013, 02:34:16 PM »


So, to make sure I understand this...6 AAs at 1.2V give me 7.2V.  7.4V is nominal, but it'll operate anywhere from 5.5 to 9.0V.


The radios main circuits operate of a regulated 5 volt feed and only transmit power is effected by voltage range. When voltage is too low it simple will not operate. Ni Mih will work fine.
Logged

--------------------------------------
All posted wireless using Win 8.1 RT, a Android tablet using 4G/LTE/WiFi or Sprint Note 3.
W0ALE
Member

Posts: 37




Ignore
« Reply #8 on: June 10, 2013, 08:14:47 PM »

Thanks a  lot for all the info!   I really appreciate it.

73, 
W0ALE
Logged
KA4POL
Member

Posts: 2040




Ignore
« Reply #9 on: June 10, 2013, 09:58:24 PM »

I found the values on page 42 of the manual for both, the E and the A version. I could not find a year. The copyright notice has only B62-2235-00 (K,E) as imprint.
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!