[Elecraft] KX3 high pitched hum on headphone jack

[Don Wilhelm]

Ooops, I overlooked the amp.  Jim's recommendations are very good.

73,
Don W3FPR

On 6/27/2013 1:59 AM, Jim Wiley wrote:
> 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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>
>