[Mobile-Portable] 2000 Watt Inverter Modified for 65 volt Mobile RF Transistor Amplifier???

[D C _Mac_ Macdonald]

Many years ago, Leece-Neville alternatorswere modified to remove the rectifiers and apply 3-phase AC voltage to three heavy filament transformers and develop 120 VAC power to feed other transformers for H.V.tube amplifiers.
* * * * * * * * * * *
* 73 - Mac, K2GKK/5 *
* (Since 30 Nov 53) *
* Oklahoma City, OK *
* USAF, Ret (61-81) *
* * * * * * * * * * *

 > Date: Thu, 7 Mar 2013 21:54:49 +0000
> From: n5wv at comcast.net
> To: mobile-portable at mailman.qth.net
> Subject: Re: [Mobile-Portable] 2000 Watt Inverter Modified for 65 volt Mobile RF Transistor Amplifier???
> 
> For powering my Henry SS 1200 I purchased a SEC America model 695CE 13.8v to 28v @ 55 amps dc - dc converter.. SEC America produces dc- dc converters rated at higher voltages. The voltages can be internally adjusted up or down a few volts beyond it's stated output if needed. . Just FYI , Randy N5WV 
> 
> ----- Original Message -----
> From: "David" <iam at pmug.org> 
> To: "Mobile-Portable Reflector" <mobile-portable at mailman.qth.net> 
> Sent: Thursday, March 7, 2013 7:52:35 AM 
> Subject: Re: [Mobile-Portable] 2000 Watt Inverter Modified for 65 volt Mobile RF Transistor Amplifier??? 
> 
> Yes, Ray, that's a real possibility. But, perhaps a few smart Hams could 
> possibly overcome it...I never say die until all avenues have been 
> thoroughly explored. 
> 
> Then there is always the idea/possibility of using a slightly modified 
> automobile alternator as a source for tinkering toward the same end...to 
> provide ~65 VDC power to big RF transistors. (the 12 volters are expensive 
> and touchy, I think) 
> 
> David B. 
> W7DBH 
> 
> 
> ** Be aware that typical DC to AC Inverters in that price range usually 
> ** utilize a square wave or stepped (sometimes called modified), square 
> ** wave switching. It would likely be far to noisy in the RF bands to be 
> ** useful. 
> ** 
> ** Sinewave inverters for that power level are available for commercial 
> ** applications, requiring low RFI emissions. They usually cost a great 
> ** deal more. 
> ** Ray, W4BYG 
> ** 
> ** 
> ** On 3/6/2013 3:26 PM, David wrote: 
> **> ** On 03/06/13 10:34, David W7DBH wrote: 
> **> ** 
> **> **> Use 2000 Watt 12VDC to 120VAC Inverter Modified for 65 volt Mobile 
> **> RF 
> **> **> Transistor Amplifier??? 
> **> ** 
> **> **> It has been my thought for a long tome that a 12VDC to 120VAC 
> **> Inverter 
> **> **> of 
> **> **> a proper capacity could be modified for use as the power supply for 
> **> RF 
> **> **> Transistor Mobile Amplifiers. 
> **> ** 
> **> **> You know, get it to run at ~65-70 Volts AC, ... and rectify & filter 
> **> it. 
> **> **> 
> **> **> Seems like it might be easy-peasy for a more engineer-type Ham to 
> **> do. 
> **> ** 
> **> **> And, right now Harbor Freight has a coupon for their 2000 Watt 
> **> **> continuous 
> **> **> (4000 watt peak) Inverter ---for only $130! 
> **> ** 
> **> **> Perhaps this could be a helpful way to get a KW in my/your car???? 
> **> ** 
> **> **> What do y'all think? 
> **> ** 
> **> ** I think a 120 to 70 Volt transformer with and a rectifier and some 
> **> ** capacitors would be a more foolproof way to do it with little 
> **> efficiency 
> **> ** loss. 
> **> ** I did not say a regulated power supply. 
> **> ** Unless you are competent at designing and building them you won't 
> **> be 
> **> ** competent at modify them. 
> **> 
> **> 
> **> Thanks for your reply, Ron. 
> **> 
> **> I did think of using such a transformer. But in the old days I used to 
> **> wind power and modulation xmfrs for myself...the iron core for a KW+ 
> **> capacity would be pretty big/heavy. BUT (idea!) maybe someone has 
> **> experience using the new donut cores...and they could possibly be 
> **> smaller/lighter for the same capacity?? I don't know very much about 
> **> them... 
> **> 
> **> Help ! ? ! 
> **> 
> **> 
> ** 
> ** 
> 
> 
> -- 
> David B. 
> 
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