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

[N5WV]

The ones from SEC America are more expensive than the others due to quality , design and American made. There are others that are cheaper but finding one that produces 50 amps or more is hard to do. I found cheaper ones on ebay up to 40 amps. The Sigma units were cheaper in price. Do a ebay search for dc dc power converters if you want to find some there. Google that also. The SEC America 695CE is around $1700.00. Randy N5WV 

----- Original Message -----
From: "David" <iam at pmug.org> 
To: "Mobile-Portable Reflector" <mobile-portable at mailman.qth.net> 
Sent: Friday, March 8, 2013 1:15:02 PM 
Subject: Re: [Mobile-Portable] 2000 Watt Inverter Modified for 65 volt Mobile RF Transistor Amplifier??? 

Hi Randy, thanks for the reply. I did not know these were available. Are 
they expensive? 

David B. 
W7DBH 



** 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 ! ? ! 
** **> 
** **> 
** ** 
** ** 
** 
** 


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