[Elecraft] Hum coupling? - A real fix!

[Daniel Reynolds]

Actually - after toasting my internal KBT2 by overcharging with an uncontrolled
solar panel (hint hint... words for the wise) - I bought a $50 MityMite 12Ah
battery/charger from Autozone. I plug it in to charge when I'm not on the air,
and then I unplug the charging cord, and turn on the radio and have RFI free
operation (well - at least free of Power Supply related RFI).

I think Elecraft might do well do design a matching UPS/PS for the K2 & K2/100.
It could utilize a smaller - well designed power supply that acts primarily as
a charger for an internal 25+ Ah battery that is used to power the K2. It could
go into an EC2 enclosure - and possibly have a forward facing speaker and
digital readout of battery voltage readout and/or charger & battery status LEDs
(rapid charge, float charge, low-voltage disconnect). Another option might be a
connection in the back for a solar panel or other 'high voltage DC' input (high
voltage being 15-24V).

- Daniel
AA0NI

--- Hank Kohl K8DD <k8dd at arrl.net> wrote:
> OK .... here's the new program!
> 
> 
> 
> Supplies with real transformers can cause hum in the K2
> Supplies with switching can cause birdies in the K2
> 
> What's the option?   No power supply?
> No power supply, No hum, No birdies, No problem?
> Well, the sensitivity goes to Hell in a handbasket.
> 
> The solution?
> The new K2-PSQ and K2-PSH