[ARC5] The "new" MF band.

[Richard Knoppow]

     Every so often I suggest using a Sola type constant voltage 
transformer to regulate power to radio receivers. I always gets sneered 
at. Sola transformers provide very well regulated voltage and will 
absolutely get rid of drift do to filament voltage variation. The 
complaints that they put out lot of harmonics was true only for the very 
early ones, most later CVT put out quite acceptably pure sine waves. 
They are somewhat noisy but can be muffled. They also tend to run hot. 
They are also fairly heavy but we are dealing with boat anchors here. 
CVTs have some interesting properties, for one they shut down if the 
output is shorted. They are also very good filters for junk on the power 
line. Used ones are not too expensive but make sure it works. CVTs are 
dependent on the capacitor in them and I think can develop some 
mechanical problems, however, if the output voltage is as rated they are 
usually OK.

On 9/16/2017 10:09 AM, Bill Cromwell wrote:
> Hi Ken,
> 
> I have been using batteries for both the heaters and the B+ (90 volts) 
> on mine. I noticed a small frequency shift whenever my space heater 
> blower kicked on off. The batteries got rid of than and reduced the 
> power line crud too.
> 
> 73,
> 
> Bill  KU8H


-- 
Richard Knoppow
1oldlens1 at ix.netcom.com
WB6KBL