[Elecraft] Gamma Research Very Small Switching Power Supply

[Karl Larsen]

Leigh L. Klotz Jr wrote:
> With 5 farads of filtering it's a probably a bit quieter than the MFJ.
    The Q of a 5 Farad capacitor is not good. It will carry the peak 
current from a SSB transmitter but it will not control RF noise. This 
comes from the high frequency chopping of the input 120 Volts. MFJ has 
some inductors and low value caps in their power supply to control RF noise.

    A 5 Farad cap is not cheap. I guess that is why it is more expensive.

73 Karl K5DI

>
> Karl Larsen wrote:
>>    Hi Henry, you can buy a power supply which is more powerful and I 
>> use daily for a FT-857D for SSB and CW which is made by MFJ. It is 
>> the MFJ-4125 which is rated at 25 Amps all the time and it SAYS "no 
>> noise on all Ham bands", and it sells for $100.00.
>>
>>    Your power supply doesn't even mention power supply noies.
>>
>>
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