[Elecraft] MFJ-4125 Continued

[Bob Nielsen]

On Tue, Sep 30, 2003 at 10:32:57AM -0700, Gene McGahey wrote:
> Pse excuse a bit more bandwidth on the MFJ-4125 Power Supply.  I have
> used the 4125 as a travel supply for 2 years with perfect success. 
> It is the smallest and lightest 13.8 VDC. 25 amp max/22 amp
> continuous/ 85 - 135 or 170 - 160 VAC, 50/60 hz (easily switched
> between the two input AC voltage standards).  It has worked FB in
> Europe and AK on several trips for QRP and QRO operation.  I also
> have the SEC1223 and is a good supply but less easy to convert
> between 120 and 240 voltage ranges and is a bit larger and I use the
> Alinco DM-330 which can be selected for 120 or 240 voltage ranges but
> not both in one supply.  As with all switching power supplies, they
> all generate some noise but the 4125 appears to better shielded, the
> 1223 is not bad, the 330 appears to generate the most noise but the
> images can be shifted out of the op range.  If you need a 13.8 VDC 33
> amp 120 AC PS the DM-330 is a great choice.
>  
> Disclaimer:  Thru the mfg process all units are not equal and when
> describing personal experiences, each testbed is different.  For
> example, when using well shielded equipment including a coaxial fed
> antenna remotely located from the rig and switching AC PS, often most
> of the switching power supply noise is not heard.  Then there are QC
> issues and we have individual choices!!
>  
> 73,
>  
> Geno AL7GQ
> 

I have an Alinco DM-330MV supply and have never been able to detect any
noise when operating between 160 and 10 meters.  I also have a MFJ 4103
switcher, which is rated at 2.89 amps and works great with a barefoot
K2.  It is quite compact and handles 100-240 VAC input.  I have not
been able to detect any switching noise with it either.

73, Bob N7XY