[Elecraft] K3 on Order

[Bob Nielsen]

On Jul 16, 2010, at 5:35 PM, Tom W8JI wrote:

>> My concern for any Switching supply is the RFI noice that the  
>> radio will
>> pick up
>> from the power supply. Looking at the SEC 1235m, I was reading  
>> that it has
>> a
>> build in RFI filter. Plus I like the AD5X mod to slow down the  
>> fan. And
>> the
>> Alinco DM-340 MVT has a knob to change the freq. of the noise that  
>> the
>> radio is
>> picking up.
>
> Any power supply that has a VFO knob built in means they either  
> don't know
> how to get harmonics down to the proper level or don't want to  
> spend a few
> bucks on components, so they took the cheap way out.
>
> I have several switching supplies and can't hear any of them  
> anywhere unless
> I run an antenna right in the room.

I have an Alinco supply and have never found any birdies which could  
be changed by that knob, so I feel that it is pretty clean.  After  
fighting some of the birds I did have for years, I switched from a  
CRT to a LCD monitor and nearly all the birds disappeared.

Bob, N7XY