I have an Astron SS-30M and the floating spurs/hash is primarily from a
hardware hack in the supply to generate voltage for the meter
illumination. If you disconnect the wire at the diode/capacitor junction
that feeds the panel lights, you will notice a very significant
reduction in the spurs/hash. I did some Internet research looking for a
fix to the RFI and found this link:
http://madpower.com/jk/Hamradio/astron/
The fellow who posted this identified the source of the problem. I can
see my meters just fine without illumination, so I disconnected the
meter light wire. (He customized his unit with LEDs). The change in RFI
was very noticeable. I also located a SS-30 schematic, but no SS-30M
schematic. After looking at the hack for the meter illumination, I'm not
surprise a schematic does not exist. I marked up a SS-30M schematic to
add the HW hack components the best I could.
When I did this research, many stated that they returned their metered
units for the non-metered units and the RFI went away.
73,
Bill
NJ1H
On 6/29/2010 9:35 AM, Ed Wilson wrote:
I own two Astron switching power supplies, the SS 25M and the 30M. Both cause "floating
spurs" or "hash" across the passband of my Flex3K and Flex5K. I changed to a couple
of older analog supplies and no longer have problems with RFI from the supplies.
________________________________
From: Ray - K9DUR<[email protected]>
To: [email protected]; [email protected]
Sent: Tue, June 29, 2010 8:33:05 AM
Subject: Re: [FlexEdge] power supply
Leon,
Of course, this is like asking someone what make of car to buy. Everyone
has their favorite!
I am using the Alinco DM-330MV switching supply. It is rated at 32 Amp peak
& 26 Amp continuous. Many of the switching supplies, including the Astron
SS-25, have a tendency to generate RF hash across the bands. However, I
have had 3 of the Alinco supplies in service for several years with no
issues& all 3 are dead quiet, no detectable RFI from the supplies.
73, Ray, K9DUR
http://k9dur.info
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This is the FlexRadio Systems e-mail Reflector called FlexEdge. It is used for
posting topics related to SDR software development and experimentalist who are
using alpha and beta versions of the software.
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Flexedge mailing list
[email protected]
http://mail.flex-radio.biz/mailman/listinfo/flexedge_flex-radio.biz
This is the FlexRadio Systems e-mail Reflector called FlexEdge. It is used for
posting topics related to SDR software development and experimentalist who are
using alpha and beta versions of the software.
