During Field Day we were visited by the truck used by one of the emergency
agencies (cannot remember which one) here in Houston. It was a Ford 350 (1
ton) diesel with custom built radio unit that had several operating
positions covering all amateur HF, VHF and UHF bands (up to 1.2 GHz). It
had the 8KW AC generator. It is HUGE! The driver said there have been no
problems with the generator providing ample power for all stations operating
simultaneously.
73, Keith NM5G
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
Behalf Of PA3DUV
Sent: Friday, October 28, 2005 3:30 PM
To: amps@contesting.com
Subject: Re: [Amps] Mobile high power
Joe,
They claim:
60 Hz +- 0.16 Hz
120 VAC +-2%
2.1% THD (Total Harmonic Distortion)
All this from 1600 rpm up to 6000 rpm
At idle the efficiency is 85%
5 and 8 kW continous.
AC only and AC/DC versions, offering 200 amps @ 14VDC and 150 amps @ 28 VD
AND in the same time 26 amps @ 120 VAC for the 5 kW model..
They claim their 5 kW model outperforms the 7.5 kW Honda EX series
generators
2 patents
Size OD 12.2 inch x Width 5.085 inch
However, the Electronic Control Unit is a rather large box 19 x 10 x 8 inch
Dick
----- Original Message -----
From: "Joe Isabella" <n3ji@yahoo.com>
To: "Amps" <amps@contesting.com>
Sent: Friday, October 28, 2005 9:20 PM
Subject: Re: [Amps] Mobile high power
> Two things...
>
> First, I run AM on 75m while mobile, so I need a little more than what is
> drawn during a "normal" SSB transmission. The rig draws 5 or 10A for AM
> carrier, then the amp is probably pulling another 30A or so for the
> carrier. And I'm sure the rig is peaking 20A during voice peaks and the
> amp somewhere around 80A. This is on top of all the vehicle electronics,
> then there's operating at night with all the lights on...
>
> Second, how is the AC frequency controlled on those things?? I have some
> experience with generators, but I'm not an expert. Wouldn't the frequency
> at idle be drastically diffferent that at say, highway speeds??
>
> Joe, N3JI
>
>
> PA3DUV <pa3duv@planet.nl> wrote:
> Joe, others,
>
> Even a high power amplifier used in SSB service will consume a limited
> amount of energy due to the low duty cycle of SSB transmissions.
> Operating from a mobile cannot be compared to for example contest
> circumstances.
>
> My experience with the Henry SS750 in the mobile is that the standard
> alternator (100 amp) in the vehicle has no problem keeping up with the
> power
> consumption of that amp. In my perception in the design of an effective
> mobile high power system the main issue for the power supply is to funish
> the current surges needed for SSB service. With one or 2 gell batteries at
> the amps terminals that can be solved. So at the end of the day I feel a
> hybrid could easily deal with the intermitted use of a high power SSB
> amplifier. I'm not so sure about the noise generated by the high power
> switchers in the hybrid.
>
> Now the advantage of an induction machine like the Aura Gen is the
> availability of 240 V AC @ 20 amps and more.
> That permits the use of tube amplifiers instead of low voltage devices.
>
> According to Aura Systems documentation they've delivered plenty of these
> units to the US military. (5 kW units)
> It's amazing that they can shoehorn an induction machine capable of 240
> VAC
> @ 20 amps or 30 amps into a OD 309 mm x lenth 163 mm unit.
> Another amazing feature is the fact that this power is available at idle
> with a very wide powerband.
> The way they convert the fluctuating ACfrom the induction machine into a
> stable sine wave is something special. On first sight it looks an ordinary
> inverter but it actually isn't
>
> Too bad the space near the crankshaft pulley of my 2005 Toyota van with
> perpendicular mounted engine block in not sufficient to accomodate this
> nice
> piece of equipment. Perhaps it's gettin time that we in Europe should
> convert to full size gas guzzlers like you guys in the US;-)
>
> Cheers, Dick
> PA3DUV
>
>
> ----- Original Message -----
> From: "Joe Isabella"
> To: "Amps"
> Sent: Friday, October 28, 2005 5:30 PM
> Subject: Re: [Amps] Mobile high power
>
>
>> That's true -- the vehicle charges when you are decelerating, as well as
>> when the engine is running. Another heavy load like a high power amp
>> would really put a dent in the power budget!
>>
>> I've always wondered though -- does the gasoline engine have to run for
>> the AC or is it run off electric as well?? It would seem that if the
>> compressor is engine powered, hybrids wouldn't make a lot of sense in hot
>> climates. I know the 100+ degree summers here in North Texas put a big
>> load on ACs as they are now anyway.
>>
>> Joe, N3JI
>>
>>
>> HAROLD B MANDEL wrote:
>> The trouble in applying extra battery loads to hybrid vehicles
>> might be that the main battery is matched to the car drive
>> mechanism such that maximum economy and speed/weight ratios
>> would not permit huge appliances without deteriorating the system.
>>
>> There's no such thing as a free lunch, so I wonder if the charging
>> system could keep up with an extra big demand....
>>
>> Hal
>> W4HBM
>> On Fri, 28 Oct 2005 07:33:26 +0100 Steve Thompson
>> writes:
>>> wc6w@juno.com wrote:
>>>
>>> > If a high power mobile unit is the goal, wouldn't one of the new
>>> hybrid vehicles make a good starting point?
>>> >
>>> > Probably a nice 300V or so battery plus all the generator stuff
>>> in place.
>>> >
>>> >
>>> I think it won't be long until 36V is commonplace - won't fix the
>>> problem of alternator size for the power, but will make the wiring
>>> easier.
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