In the past I've used a SG-237, a SG-230, a CG-3000 and a MFJ-927 all
remotely mounted and powered from switching power supplies in the ham
station (Astrron SS-25, MFJ-4125 and most recently a SEC 1235) - using both
external DC feeds and biasT feeds through the coax. Never any problems.
Phil
Plus Astrons have excellent overvoltage protection. The only RFI-induced
malfunction I've ever been able to induce in an Astron is to trip that
protector. It's a crowbar circuit that shuts of the output completely if
it detects an over-voltage (typically something close to 15 VDC) on the
output of
: Phil Debbie Salas [mailto:dpsa...@tx.rr.com]
Sent: Wednesday, November 03, 2010 7:47 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] (OT) - Power Supply for SGC-237
In the past I've used a SG-237, a SG-230, a CG-3000 and a MFJ-927 all
remotely mounted and powered from switching power
Look what just showed up in my email from SGC:
After getting together with one of our other technicians and using your
Astron RS-20M,
He seems to think that particular power supply
: Wednesday, November 03, 2010 7:47 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] (OT) - Power Supply for SGC-237
In the past I've used a SG-237, a SG-230, a CG-3000 and a
MFJ-927 all
remotely mounted and powered from switching power
supplies in the ham
station (Astrron SS-25
If there is any lister using the SGC-237 autocoupler, could you please
tell me what power supply you are using for it?
My coupler (backordered for two months - they are apparently very
popular) is arriving on Friday and I just found out from an SGC tech's
email that I am only supposed to use
On SCC's Installation FAQ page I see this explanation:
Analog or switching power supplies themselves are highly susceptible
to RF. A few millivolts of RF in the power supply can create an
instability which could lead to a catastrophic failure. We never
recommend regulated or switching power
Bob, I guess I missed this in the FAQ:
Analog or switching power supplies themselves are highly susceptible
to RF. A few millivolts of RF in the power supply can create an
instability which could lead to a catastrophic failure. We never
recommend regulated or switching power supplies because
OK, folks -- I located a 12 volt DC, 4 amp, UNregulated power supply for
$7.95. It's just the guts - I get to build it into a nice cabinet,
put an on/off switch on it, a pilot light, supply my own jacks,
etc..PERFECT FOR A HAM!
Here's the link for anyone with a similar need:
Stan,
For an unregulated supply, try this MPJA unit -
http://www.mpja.com/prodinfo.asp?number=17636+PS -
You will probably want an enclosure, so look in the left side of the
webpage for Boxes and Cabinets.
Or purchase a transformer, a bridge rectifier and a capacitor and build
your own
On 11/2/2010 4:54 PM, Bob Cunnings wrote:
Analog or switching power supplies themselves are highly susceptible
to RF. A few millivolts of RF in the power supply can create an
instability which could lead to a catastrophic failure. We never
recommend regulated or switching power supplies
11 matches
Mail list logo
