[ARC5] AM linear amplification

[AKLDGUY .]

Thank you for that tip.

73 de Neil ZL1ANM

On Wed, Dec 21, 2016 at 6:28 AM, Kenneth G. Gordon <kgordon2006 at frontier.com
> wrote:

> On 20 Dec 2016 at 18:25, AKLDGUY . wrote:
>
> > > Got any microwave ovens around your neck of the woods?
> >
> > Yes, you can spot them out on the kerb every year during the annual
> inorganic collection. Or you
> > can get them from Salvation Army or other charity shops for a song. I
> knew they had HV
> > transformers, but thought they didn't deliver much current?
>
> They deliver well over 1KW of power. Their main trouble is that one side
> of the secondary is
> connected directly to the core. There are several articles on the web
> describing ways to
> safely use them in a homemade amplifier, though.
>
> In addition, there is usually a magnetic shunt installed in the core, and
> this must be
> removed, but it is a quite simple process. One drives it out with a
> screwdriver or a punch
> and a hammer.
>
> Microwave ovens also include an excellent HV rectifier, but usually only
> 1/2 wave, so you
> have to use two of them.
>
> > > My preference is push-pull Class B. For a single-band, that isn't all
> that difficult to
> > > implement...and it has other advantages...
> > >
> > > Besides, it is symetrically pleasing...at least to me... :-)
> >
> > Yes, PP appeals to me too. I was thinking of a dual bander 80/40, but
> the BC-230 might spend
> > most of its time on the 40m AM net. Pulling out and changing that coil
> unit is a pain.
>
> Yes. I agree. That is why I mentioned "single band". :-)
>
> Ken W7EKB
>
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