[SCCC] SCCC Digest, Vol 187, Issue 14

[k6xt]

I've been using Astron SS30 and SS20 for many years. I modified the SS30 
with a resistor to 12V to run its internal fan constantly at low speed. 
This generally prevents the fan ever activating at full speed except 
during RTTY contesting running K3 at 100W. The internal fan rarely 
activates when driving an amp for RTTY.

The Astrons were chosen based on ARRL testing.

73 Art K6XT~~
Success is going from failure to failure without a loss of enthusiasm.
ARRL LM, CW OPS, GMCC, MHDXA, NAQCC, NCDXF, SDDXC, CDXC
ARRL TA

On 7/27/2018 12:22 AM, sccc-request at contesting.com wrote:
> Hi,
>
> I've been using an MFJ-4245MV as the 12V power source for my transceivers for a number of years. This model's RF noise performance was judged as one of the best in ARRL Lab tests. However, its fans are annoyingly loud. I'm considering going back to using my Astron linear-regulated supply.
>
> Does anyone have a recommendation for a switching power supply in the 30A range that is both RF noise quiet and is audibly quiet? Thanks.
>
> 73 de Bruce, WA7BNM