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

N5WV n5wv at comcast.net
Thu Mar 7 16:54:49 EST 2013


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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