How quickly will a UHF unit drain the main battery?

Hi everyone,

Just got my first UHF (a GME TX 3440 if that helps with an answer) and I'm wondering how long I've got in safety time for battery life if I forget to turn it off. It's not wired up through the ignition switch, just straight off the main bat.

thanks,
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Reply By: Ozhumvee - Sunday, Feb 07, 2010 at 09:04

Sunday, Feb 07, 2010 at 09:04
Mine is the same (not switched with the ignition) and even leaving it on overnight when camped doesn't affect next mornings startup.
Over a week or more it will have an effect.
Peter
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AnswerID: 403043

Reply By: Sir Kev & Darkie - Sunday, Feb 07, 2010 at 09:05

Sunday, Feb 07, 2010 at 09:05
I had one in my old work car that was wired direct to the starter battery (about 550 CCA) and it would totally flatten the battery in 48 - 60 hours.

I ended up not bothering turning it on unless I really needed it, as the workshop would not rewire it for me.

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AnswerID: 403044

Reply By: Roughasguts - Sunday, Feb 07, 2010 at 09:06

Sunday, Feb 07, 2010 at 09:06
How many Amp hour Battery???

How many Amps does the radio use, ?

How old is the battery ?

Just a guess somewhere between 3-4 hours before the starter motor gets a little slow, for a near new battery.
AnswerID: 403045

Follow Up By: Member - Roachie (SA) - Sunday, Feb 07, 2010 at 10:45

Sunday, Feb 07, 2010 at 10:45
That would have to be a VERY SMALL battery....... the UHF draws less than 1 amp (in standby mode...IE: neither receiving nor transmitting). I have a little battery (7a/h) that I use to run my Versa-lite (uses 1 a/h) and it runs for about 7 hours on a full charge.

So, for the UHF to run the battery flat in 3-4 hours, the battery would need to be about a 3 a/h.

Now, considering that "most" 4x4 batteries are rated at around 500cca or better, I would say that the other respondants (who have said several days) are more likely to be closer to the money.

Roachie
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FollowupID: 672562

Follow Up By: Nomadic Navara - Sunday, Feb 07, 2010 at 15:41

Sunday, Feb 07, 2010 at 15:41
I have had mine on for 3 - 4 days and that has not prevented me from starting the motor.

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Follow Up By: Roughasguts - Sunday, Feb 07, 2010 at 17:52

Sunday, Feb 07, 2010 at 17:52
Oooops My bad I meant 3-4 days, I must of had Amps and Hours only on the brain, and didn't convert to days.

Cheers
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Reply By: MEMBER - Darian, SA - Sunday, Feb 07, 2010 at 09:19

Sunday, Feb 07, 2010 at 09:19
Looks like it only uses 600mA while left on - some UHF's will power down after a set time if not used - maybe not this one though.
AnswerID: 403048

Reply By: Member - John and Val - Sunday, Feb 07, 2010 at 09:27

Sunday, Feb 07, 2010 at 09:27
Our GME TX3200 draws less than 0.2 amps just sitting muted on receive. On this basis, it draws less than 5 ah per day, so shouldn't be a problem if left on for quite a few days. Yours may draw more current. Suggest measure the current drawn to see if you actually have a problem. If it doesn't look good, just move the UHF's 12V supply line onto an "accessory" switched wire - the back of the cigarette lighter will probably be your closest "accessory" switched source of 12 volts. (Disconnect the battery while your changing the connection!!)

John
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AnswerID: 403051

Reply By: Member - Tour Boy ( Bundy QLD) - Sunday, Feb 07, 2010 at 09:33

Sunday, Feb 07, 2010 at 09:33
I have a TX 3200 in the D4D hilux that is wired live to the original factory battery (now 118000km old) and I have no issues starting the vehicle after 3 days of not starting it.

Cheers
Dave
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AnswerID: 403053

Reply By: zigdog - Sunday, Feb 07, 2010 at 10:24

Sunday, Feb 07, 2010 at 10:24
Thanks everyone,

Further reading of the manual informs me that my unit has a feature to display battery power, (currently flashing between 13.0 & 12.9v) so I'll be able to keep my eye on it.

cheers,
AnswerID: 403065

Reply By: rowdy31 - Sunday, Feb 07, 2010 at 15:35

Sunday, Feb 07, 2010 at 15:35
Gday zigdog. Mine (gme 3200, 4400 and 3420) are wired direct to the battery and I have left them on all day and overnight before, doesnt drain bugger all. Only problem you will find is that at about 2/3 am in the middle of nowhere you get woken from a deep sleep due to hearing voices in the bush, has scared the bejesus out of me before.

cheers
Rowdy
AnswerID: 403111

Reply By: Shaver - Sunday, Feb 07, 2010 at 16:07

Sunday, Feb 07, 2010 at 16:07
I have a GME 4400 in a 200 series Cruiser (single battery) & had inadvertantly left it on for a week & it fired up as without any trouble. A big sigh of relief !
AnswerID: 403117

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