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12 volt '1200 watt' amplifier...


Item number 320744962188
Is this any of you? emoticon

Seems he's asking a heck of a lot for this.

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Andy - FB107
21/Aug/2011, 10:10 am Link to this post Send Email to Hot Fusion   Send PM to Hot Fusion
 
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Re: 12 volt '1200 watt' amplifier...


I seen this, fancied having a go with it but wonders how long battery would last on full power, not long I bet
Al

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Al -163FB777 - N.Wales, UK
Kenwood TS-480SAT, TS590, MC-90, Yaesu FT1000D, FT2000D,RCI 2995dx, Heil 781, 5 eli beam, F/S G5RV, K40 when mobile, A99 for portable. Optima V3,Portapack. RM KL500-modded, PMR`s.Ranger 1k Amp
21/Aug/2011, 10:36 pm Link to this post Send Email to Kaosss   Send PM to Kaosss Blog
 
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Re: 12 volt '1200 watt' amplifier...


If it really can output 1200 watts, assuming 50 % efficiency that would be 200 amps current draw - similar to a starter motor.

I see it has 8 output devices and some pretty spindly wiring - personally I can't see it actually outputting this kind of power without self-destructing.

Now, if it was made to operate from 48 volts or so, I could be persuaded to believe it.

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Andy - FB107
22/Aug/2011, 8:26 pm Link to this post Send Email to Hot Fusion   Send PM to Hot Fusion
 
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Re: 12 volt '1200 watt' amplifier...


500 quid it went for?? i would of rather spent a couple more for a decent 240v one. i mean who will use it mobile at 200amp?? unless they drove a electric forklift i supose emoticon

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24/Aug/2011, 6:59 am Link to this post Send Email to topbuzzuk   Send PM to topbuzzuk Yahoo
 
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Re: 12 volt '1200 watt' amplifier...


Agreed - you'd be hard pushed to find a mobile antenna capable of taking that kind of power too. emoticon

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Andy - FB107
25/Aug/2011, 6:21 pm Link to this post Send Email to Hot Fusion   Send PM to Hot Fusion
 
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Re: 12 volt '1200 watt' amplifier...


A Wilson takes 5kw according to the manufacturer. And I once saw a valve linear, Yaesu, that was 1200w cw 12v mobile! On Ebay UK

I'll have a search for the details, must be somewhere emoticon

Also in the states the superbowl guys and key down yobs have massive 10kw plus mobile amps with 2-3 alternators and massive battery banks, hell they have 2kw driving amps emoticon Mad

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By all means think yourself big, but never think others small.... R.F.Scott
25/Aug/2011, 7:10 pm Link to this post Send Email to yamanx1   Send PM to yamanx1
 
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Re: 12 volt '1200 watt' amplifier...


ive got that as 100 amps... I = W/V = 1200 OVER 12 = 100? or am i missing something? lol
1/Dec/2012, 9:42 pm Link to this post Send Email to 26fb010   Send PM to 26fb010
 
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Re: 12 volt '1200 watt' amplifier...


Alternators charge at around [sign in to see URL] although battery voltage is typically [sign in to see URL].

Using that by 1200W you come up with 170A based on the amp being 50% efficient which I think is normal for amplifiers run in class-AB for SSB use.

Now, this is peak amps and not average.

If you're not talking into the mic there's virtually zero current draw.

170A is peak but probably half that for average current draw and most modern vehicles can cope with that although I'd still suggest upgrading to a higher output alternator and higher capacity battery just to be on the safe side.

The superbowl guys in the US have been mentioned above. Most run Leece Neville 200A alternators all wired in parallel as these offer the best bang for the buck however the guys that run valve amps in the 'unlimited AC' class in competition run 350 Amp Electrodyne alternators ([sign in to see URL]) - up to 8 which in normal service are used in locomotives! Trains to you and me.

I forgot to add, many DC operator use DC to DC converters or variable voltage regulators to 'over volt' the 12V Toshiba 2SC2879 transistors. These devices are rated at 100-120W pep but at 18-20V you can get a very dirty 200W+ out of them for the 10 seconds that these guys are on the line. Biggest DC amp I've seen has 128 transistors. I have a photo on the PC somewhere.

10kw is flee power in their unlimited DC class (solid-state amps) with unlimited numbers of alternators. Up to 30kw is run. Unlimited AC (with valves) have several guys running 100kw+ with a pair of 4CX25K valves in the final PA.

Video cameras stop working and the birds drop out of the trees.

Unit 148 mobile

Last edited by 148, 4/Jun/2015, 4:51 pm
4/Jun/2015, 4:42 pm Link to this post Send Email to 148   Send PM to 148 Blog
 
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Re: 12 volt '1200 watt' amplifier...


You have to love that 'superbowl'!
For anyone interested who hasn't seen it, have a look on youtube.

Mad buggers!!

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Andy - FB107
25/Jun/2015, 4:58 pm Link to this post Send Email to Hot Fusion   Send PM to Hot Fusion
 


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