[AMRadio] Modified sine wave to sine wave

[Bernie Doran]

There could be all sorts of issues here.  might be better to use  an in line 
filter on the output. It is all going to depend on what the noise 
frequencies really are.  I assume they are high enough to bother HF 
receivers. If so that sounds like a  a high perm toroid with  a few turns 
and bypass caps on each end.  And of course shielding. might even be on the 
battery leads.
----- Original Message ----- 
From: "Jim Isbell, W5JAI" <jim.isbell at gmail.com>
To: "Discussion of AM Radio in the Amateur Service" 
<amradio at mailman.qth.net>
Sent: Tuesday, May 01, 2012 10:11 AM
Subject: [AMRadio] Modified sine wave to sine wave


>I have a modified sinewave inverter.  I want to get rid of some of the high
> frequency noise in the AC.  It occured to me that running the output
> through a 1:1 transformer with a capacitor across the primary might smooth
> out the bumps.  Any comments?
>
> Jim Isbell
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>
>
>
> On Mon, Apr 30, 2012 at 10:51 PM, Geoff <w5omr at att.net> wrote:
>
>> On 4/29/2012 10:48 AM, kc9cdt at aol.com wrote:
>> > Geoff,
>> > Thanks for all the help.
>> > Well,
>> > I guess I can meter the primary of the Mod XFMR...if it's open that
>> > should be obvious.
>>
>> Well, either open or shorted.  Come to think of it, a shorted
>> transformer would cause a much higher current reading.  Make sense?
>>
>> > OK, I have a handle on a old Viking II...is the mod XFMR the same...if
>> > it is, I can get it cheap.
>>
>> The Interstage audio Driver transformer, I believe, is the same in the
>> Ranger and the Viking II.
>> Neither of 'em are much bigger'n a walnut (so it seems)
>>
>> > Maybe I should adj the resistor just to see if it helps?
>> > If the resister is open...would that cause the high current?
>> >
>>
>> The sliding tap resistor is what sets the screen voltage.
>> Be very careful when sliding that tap... best to remove all stress from
>> the 'slider' and don't slide it at all, rather open it up, place it
>> where you want it, then re-secure it and measure.
>>
>> -Geoff/W5OMR
>>
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