[Elecraft] KX3 high pitched hum on headphone jack

[Jim Wiley]

The 6 amp Astron would not do the job.  He needs a supply capable of 
more like 20 to 25 amperes to handle the load presented by the rig plus 
the amplifier.  The Astron 20 or 35 ampere models should do the job, 
with the 35 amp version having some extra reserve so he could run the 
rigs he describes plus something else, such as a separate VHF/UHF FM 
transceiver.

My K2 plus the combination KPA100 / KAT100 in an EC2 draws 17 to 20 
amperes at 100 watts output, depending on band and the actual voltage of 
the "12 volt" source.

As you state, there are are some good 25 amp switchers out there, such 
as the MFJ 4125 and the Astron SS-25 that have been tested for low RF 
noise.

- Jim, KL7CC


On 6/26/2013 7:36 PM, Don Wilhelm wrote:
> The Astron 6 amp linear supply comes to mind.  There are some good 
> switchers out there, see the ARRL Product reviews for an independent 
> assessment.
>
> 73,
> Don W3FPR
>
> On 6/26/2013 6:24 PM, kg4olw wrote:
>> Just as an update I am trying to tune in a very weak signal am radio 
>> station.
>> Another thing i noticed today while messing around is that besides noise
>> from the pc, I also experienced additional noise when it is plugged 
>> into my
>> bargain bin pyramid 25amp switching power supply. I never noticed 
>> this on
>> HF, so maybe it is just more pronounced on AM. Any suggestions on a good
>> linear power supply that will also support the draw of the kxpa100?
>>
>>
>>
>> -- 
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