[ARC5] Converters for Q5-ers (PS hum)

[Bill Cromwell]

Thanks Dennis,

I'm takings notes here and looking at what I have. My Kenwood doesn't 
"seem" to bothered as much so I will look at the power supply schematics 
but I suspect I am *hearing* less of the crud because of the system 
passband and much more is seen by the front end - bad! I was surprised 
by the small amount of current drawn by six tubes from the B+ at 45 and 
90 volts. I suppose I have become used to larger numbers for the plate 
current in transmitters. I have several hours on the batteries on the 
BC-453 now and the batteries are still chugging away.

I thought I had a used power connector with the built-in filters left 
from a swap-fest purchase that included two or three of those units. 
They are reasonably priced from places like Mouser, etc. I might 
purchase the individual parts and put them together to handle higher 
current for transmitter power supplies. A filter built heavier will 
surely not be harmed by *ANY* receiver.

73,

Bill  KU8H


On 01/20/2015 12:31 PM, Dennis Monticelli wrote:
> On my BC-453 I either run batteries as you do, Bill, or I use HP bench 
> supplies, which have excellent output noise specs.  The local noise 
> environment is bad enough as it enters from the antenna without having 
> to worry about direct feed of line noise into the receiver circuitry.
>
> Dennis AE6C
>