Easy way out of this mess, if a little expensive...
A big PSU dedicated to the rig(s), implementing "Remote Sensing" so at a
distribution point close to the radio(s) the DC voltage is held
constant, irrespective of the cable length from the PSU.
This power supply should have a proper overload (an
On 2019-06-12 7:55 PM, Don Wilhelm wrote:
Connection resistance contributes .05 volt loss under a 20 amp load
for each contact point, you have 6 contact points in the path for a
fused RigRunner plus two in the APP connector at the transceiver,
plus the connection to the power supply for a total
After consulting copper wire tables and typical connection resistances,
I can present the following analysis for a 20 amp load:
Often hams power their 100 watt transceivers through DC distribution
devices such as a RigRunner which will contribute to the voltage drop.
Also in-line fuses will co
Regarding "heavy gauge wire", I suggest one measure the voltage drop
using a DVM connected direct between the power supply Pos terminal and
the radio Pos terminal. Likewise do the same for the Neg DC line.
Put the radio in CW mode and close the key for rated output. If one
finds more tha
supply for a K3s
I have a Powerwerx SS-30DV power supply but I only use it when operating from
the Caribbean. I have not heard any RF noise from it during normal contest
operation. I wish that there were more two more PowerPole jacks but I added a
junction so I can power all of my 12v peripherals
I have a Powerwerx SS-30DV power supply but I only use it when
operating from the Caribbean. I have not heard any RF noise from it
during normal contest operation. I wish that there were more two more
PowerPole jacks but I added a junction so I can power all of my 12v
peripherals plus the K
This is has been an instructive thread as it gives some ideas for
quieting the top cover of the RM-50M under my desk. I'm also curious
that not much has been written about the Power Werx SS-30DV resold by
Elecraft:
https://elecraft.com/collections/power-supplies/products/ss30dv-25a-30a-surge-powe
Linear PSs are not noisy as far as I know. You're comparing apples and
oranges!! ;-))
Bert VE3NR
On 6/12/2019 9:17 AM, Harry Yingst via Elecraft wrote:
Another vote for the Astron Power Supplies they work well.
Use the shortest run between the PS and radio you can and of a heavy gauge wir
I've found a good source for power supply wire for the DC connections.
Automotive primary wire, #10 AWG. This wire is made using many small
strands which make it very flexible. Various colors are available. I
use Red {DC Pos}, Black {DC Neg} and White {equipment bonding wire}.
Also I u
Another vote for the Astron Power Supplies they work well.
Use the shortest run between the PS and radio you can and of a heavy gauge wire.
On Tuesday, June 11, 2019, 6:15:14 PM EDT, Bob Nielsen - N7XY
wrote:
The Astrons are quiet and pretty reliable. I have had a RS20 since 1980
The Astrons are quiet and pretty reliable. I have had a RS20 since 1980
and the only problem I had was cured by replacing the regulator chip
about 35 years ago.
Bob, N7XY
On 6/10/19 5:04 PM, Alan Corbeth wrote:
I have an Astron RS35 power Supply purchased in 1991. There was a period where
I have twelve RS-35M power supplies and all are completely quiet.
- Original Message -
From: "Alan Corbeth"
To: "Bill"
Cc: "Elecraft International Group"
Sent: Tuesday, June 11, 2019 12:04:02 AM
Subject: Re: [Elecraft] Silent power supply for a K3s
I have an Astron RS35 power Supply purchased in 1991. There was a period where
I didn’t use it for ten years. Now it’s in use daily and so far it continues
to be totally quiet.
Alan
K7FH
> On Jun 10, 2019, at 3:56 AM, Bill wrote:
>
> I have several Power Werx switchers and prefer them for t
-Original Message-
> > From: elecraft-boun...@mailman.qth.net
> On
> > Behalf Of Richard Zalewski
> > Sent: Sunday, June 9, 2019 19:53
> > To: Leroy Buller
> > Cc: Elecraft Reflector
> > Subject: Re: [Elecraft] Silent power supply for a K3s
> >
&
old.
George AI4VZ
-Original Message-
From: Charlie T
Sent: Monday, June 10, 2019 7:57 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Silent power supply for a K3s
Any supply that is regulated, whether a switching or linear regulator
circuit is used, has the potential to "
On 6/9/2019 23:16, Bert wrote:
How would a switched PS take out a radio?
Bert VE3NR
Most likely due to overvoltage. Linear supplies are particularly
susceptible, as the series pass transistor is under stress and can
short. Switching supplies can fail if the voltage feedback loop somehow
op
al Message-
From: elecraft-boun...@mailman.qth.net On
Behalf Of Bert
Sent: Monday, June 10, 2019 12:16 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Silent power supply for a K3s
How would a switched PS take out a radio?
Bert VE3NR
On 6/9/2019 11:40 PM, Jim - N4ST wrote:
> I don't kn
I think that's probably going to be the winner for me if it is indeed silent
(or near-silent). Thanks Bob!
- pjd
-Original Message-
From: Bob McGraw K4TAX
Sent: Sunday, June 9, 2019 1:57 PM
To: Peter Dougherty
Cc: Elecraft@mailman.qth.net
Subject: Re: [Elecraft] Silent power s
I have several Power Werx switchers and prefer them for their size over
the heavy analog supplies. Fans are not a problem (actually, I hear
nothing from them at all) - IF you design your radio desk for proper
equipment placement. Place the power supply at your right hand - and you
WILL hear noi
Somewhere around 1980 I was talked into buying a power supply at a hamfest by
my good friend who was a great technician. He told me it was a terrific deal.
He was right. I don't remember what I paid for it but I know it was lessthan
$100. It was a 56 amp rack mounted Llamda metered supply.
0 (it smoked
my rig when it failed).
73,
Jim - N4ST
-Original Message-
From: elecraft-boun...@mailman.qth.net On
Behalf Of Richard Zalewski
Sent: Sunday, June 9, 2019 19:53
To: Leroy Buller
Cc: Elecraft Reflector
Subject: Re: [Elecraft] Silent power supply for a K3s
I did two o
craft-boun...@mailman.qth.net On
Behalf Of Richard Zalewski
Sent: Sunday, June 9, 2019 19:53
To: Leroy Buller
Cc: Elecraft Reflector
Subject: Re: [Elecraft] Silent power supply for a K3s
I did two of the Samlex and returned them both. The fan problem drove me
crazy. I replaced it with a MFJ-4230M
How old was the RS35 before it started to buzz?
Could this be as simple as buying another RS35?
Mike va3mw
On Sun, Jun 9, 2019 at 7:54 PM Richard Zalewski wrote:
> I did two of the Samlex and returned them both. The fan problem drove me
> crazy. I replaced it with a MFJ-4230MV and love it.
I did two of the Samlex and returned them both. The fan problem drove me
crazy. I replaced it with a MFJ-4230MV and love it. Quiet cool and good
metering.
Richard
*W7ZR* ex:5C5Z, CN2ZR, K2JSP, W6SBZ, W7KXR, K9ZIJ, W9KNF, W0KDF, W0MQU,
J68ZR, KC6ZR, PJ4/W7ZR, KH2,W7ZR, KH6/W7ZR, V31ZR, VK4AAZ, X
The issue with oversizing it is (for the energy conscious) a linear
supply demands more, ALL the time (it's inefficient with energy).
In some places it matters because of the KwH costs. pennies turn into
dollars.
(Not here, I was used to the higher prices and after I moved here, I
just stop
As alway...way cool.
Lee K0WA
On Sun, Jun 9, 2019, 6:16 PM Jim Brown wrote:
> On 6/9/2019 7:52 AM, Peter Dougherty wrote:
> > Any suggestions? Within reason, cost isn't a
> > major issue.
>
> Sure. Another linear Astron, maybe bigger, higher power rated. I don't
> know how common the buzzing pr
On 6/9/2019 7:52 AM, Peter Dougherty wrote:
Any suggestions? Within reason, cost isn't a
major issue.
Sure. Another linear Astron, maybe bigger, higher power rated. I don't
know how common the buzzing problem is. As Lee suggested, tighten screws
and bolts on the one you have if you still have
I use an IOTA DLS-55 SMPS power supply (https://www.iotaengineering.com/
dls55.htm). It provides 55 amps, doesn’t produce RFI, is audibly quiet,
and rugged. Mine is mounted under the radio table and is on 24/7/365.. I
never hear it. Iota also makes them in other output currents and voltages.
Ken
I find Mark's point very important. Obtain and use a supply which is
more than adequate for the service or load. Thus a 25 amp supply
feeding a radio drawing 20+ amps will need lots of cooling. This is
not the way to do it. Get a 50 amp supply for a radio drawing 20+ amps
and the fan(s)
Peter,
Check out the high amperage 13,8 volt power supplies offered by Samlex
America at the following link, and in particular their 100-amp -plus
(continuous) supplies where the fans do not activate for low draws. You had
mentioned something about price not being so important. These ain't cheap
I use a Pyramid PS-36KX, which is a linear 35 amp supply. It costs
about $155 on Amazon.
Universal Compact Bench Power Supply - 32 Amp Linear Regulated Home Lab
Benchtop AC-to-DC 12V Converter w/ 12-15V DC 115V AC 600 Watt Input,
Amperage Gauge Display, Adjustable Voltage - Pyramid PS36KX
-
I'm using an Astron SS-30M with very satisfactory results.
73
Bob, K4TAX
Sent from my iPhone
> On Jun 9, 2019, at 9:52 AM, Peter Dougherty wrote:
>
> Hi all,
> I would like to find a power supply to power the K3s that is completely
> silent. I've owned an Astron RS-35M, which was great until
I've installed modern, silent fans in nearly every piece of equipment I
own, including my Samlex 1235. They're not expensive and come in all
standard sizes. Can't hear my PC or power supply fans at all from a few
feet away. Look for Nanoxia Deep Silence fans. (No, I'm not retrofitting
my Elecr
I have an RM-50M at present. To cut a lot of the audible hum I have it
setting on some plastic rings that fell out of a light fixture (d'oh!)
and it is thus supported on the bottom plate the transformer mounts to
rather than the feet of the supply. As I have the supply under the
desk, I just reac
Whatever you do, don't take the path I did:
https://www.worldwidedx.com/threads/megawatt-vs-chinese-imitation-30-amp-switching-power-supply-comparison.182976/page-7#post-578238
73, Nate, N0NB
--
"The optimist proclaims that we live in the best of all
possible worlds. The pessimist fears this
I've been running an Astron RS-35A for several years now, fortunately
withoutany buzzing. However, I use it to feed a WMR PG40S, which keeps a large
(105Ah)AGM SLA battery charged, and that feeds a RigRunner. I adjusted the
RS-35A to14.1 V on the RigRunner (on receive), and it dips to 13.5 or s
I found that there is a terminal block inside most Astron Power
Supplies, that sometimes gets mounted on a painted surface.
I always check all Astron supplies I buy, new or used, to insure the
paint has been removed under the ground connection of the internal
terminal block. In about 50% of t
This is an issue that I have also, but have chosen to ignore. I have the
samlex, astron ss30 and a rm30. The Quiet one is the rm 30. You might
try to tighten the bolts on the transformer. That helped mine, but no fan.
One issue is keeping the power cord short to keep from getting a voltage
dr
Hi all,
I would like to find a power supply to power the K3s that is completely
silent. I've owned an Astron RS-35M, which was great until it started
buzzing like crazy. I swapped that out for a Samlex SEC-1235M, and did the
fan mod to keep the fan on constantly at low speed. The problem here is th
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