[ARC5] osc. reg.

[Bill Cromwell]

On Tue, 2013-01-01 at 14:15 -0800, Kenneth G. Gordon wrote:
> On 1 Jan 2013 at 16:46, Darryl Sage wrote:
> 
> > Hi  I am looking for a diagram of a solid state regulator for my 80
> > meter arc 5
> 
> If you don't mind using VR tubes, connect a VR-105 and a VR-90 in series 
> with an appropriately-sized dropping resistor from your +HV supply. That will 
> give you 195 VDC of very-well regulated oscillator voltage. 
> 
> Or two VR-105s will give you 205 VDC. Both at up to 30 mA. The 5-volt 
> difference isn't going to effect anything. 
> 
> I would size the resistor to draw 15 mA through the VR tubes with no load on 
> the output. The 1626 draws only a few mA.
> 
> Or you can use Zeners in the same configuration.
> 
> > what I am doing now is using a variac to get the b plus on
> > the osc. 200  volts key down
> 
> Variacs, unless you use a REALLY BIG ONE, are very poor at regulation.
> 
> > I have a 28 volt  ps. which is not on the
> > variac  Does this setup work to keep chirp down ?
> 
> It could.
> 
> Fellas?
> 
> Ken W7EKB

Hi,

I'm voting with Ken. The VR tubes and dropping resistor are good. I also
would recommend using solid state regulator parts as you will have
plenty of room inside the TX to hide them without have to knock holes in
anything. I don't think the variac is contributing much to stability. If
you are keying the VFO you will likely still have some chirp even if the
regulator reduces it.

As somebody else has said..a little bit of "character" is worth a lot of
RF power on the air. Just enough character that you can be noticed but
not enough character to drift out of the other guy's filter passband and
on top of another, adjacent QSO. Enjoy your radio :)

73,

Bill  KU8H