[Elecraft] Wall wart for KX3

[Christian AK4VV]

Agree.  And an Astron RS-35M does the heavy lifting in my shack.  But a
little wallwart can go a long ways when the Astron isn't in reach.

73,
Christian
AK4VV
 On Dec 18, 2012 9:33 PM, "Don Wilhelm" <w3fpr at embarqmail.com> wrote:

> Ed,
>
> I for one would not trust any radio to a wall-wart power supply unless it
> stated on the label that it was regulated.
>
> In most cases, the open circuit voltage will soar, and the KX3 maximum
> voltage is 15 volts.  Under the supply's rated load, the voltage will
> normally reduce to the voltage on the label, but there is usually a wide
> swing between no-load and full-load voltages.
>
> I would suggest a real power supply which is rated at 4 amps or more for
> the KX3.
>
> My own KX3 runs off an Astron 30 amp supply and is fused for 10 amps to
> protect the wire from any fault.
>
> 73,
> Don W3FPR
> On 12/18/2012 9:17 PM, Ed Picha wrote:
>
>> KX3 gurus:
>>
>> Has anyone found a wall wart they like for the KX3?  Like most hams, I
>> have a big box of wall warts, and have tried several different 12 V
>> adaptors with the KX3.  They all worked ok for general operation, but I
>> noted that when I added the KXBC3 battery charger option to the KX3, I
>> really needed an honest 13.8 V or higher to fully charge the internal
>> batteries.  Most of the warts I tried had outputs less than 13V, and the
>> few that I found that could supply 13.8 V under load had voltages above 15
>> V with no load.   I didn't want to take a chance with these by exceeding
>> the KX3 upper voltage speceven for the short time that it would take for
>> the adaptor voltage to drop.
>>
>> My KX3 current drain numbers are (all at 13.8 V):
>>
>> receive, with backlight:  0.190 A
>> receive while charging batteries: 0.400 A
>> transmit, 5W: 1.04 A
>> transmit, 10W: 1.91 A
>>
>> So, I guess the ideal adaptor would be capable of 2A at 13.8 V to support
>> running the radio with no (or fully discharged) batteries at full power,
>> and would not exceed 15 V with no load.  While I'm wishing, it would also
>> be smalland lightweight.
>>
>
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