Go Back   WorldwideDX Amateur Radio Forums > Amateur Radio Related > Tuners, Mics, Meters & other Accessories


Amateur Callsign Lookup
Enter Callsign:

ASTRON RS-50A Noisy

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 12-13-2011, 09:49 AM
Se7en's Avatar
W9WDX Amateur Radio Club Member
iTrader: (3)
 
Join Date: Jun 2010
Location: Ca
Posts: 4,713
Se7en is on a distinguished road
Default ASTRON RS-50A Noisy


It has CORK material padded between the huge transformer and the top Case. lately the power supply has gotten louder and louder......and yes when turning on in a cold start it kicks sometimes... which is normal from what i understand. i would like to quiet it down a bit any possible ideas how to quiet this thing down?
__________________


Reply With Quote
  #2  
Old 12-13-2011, 10:17 AM
Se7en's Avatar
W9WDX Amateur Radio Club Member
iTrader: (3)
 
Join Date: Jun 2010
Location: Ca
Posts: 4,713
Se7en is on a distinguished road
Default

This is in the wrong section can it be moved please.
__________________

Reply With Quote
  #3  
Old 12-13-2011, 12:28 PM
Captain Kilowatt's Avatar
Professional Amateur
iTrader: (1)
 
Join Date: Apr 2005
Location: Nova Scotia,Canada
Posts: 11,070
Captain Kilowatt will become famous soon enough
Default

Start by tightening every nut, bolt, and screw you can find especially the bolts holding the transformer to the case and the bolts holding the transformer itself together. Tighten them as tight as you can as the metal plates in the transformer often vibrate when loose and can be quite loud.
__________________
There are 10 kinds of people in this world. Those that understand binary and those that don't.

Reply With Quote
  #4  
Old 12-13-2011, 12:55 PM
Se7en's Avatar
W9WDX Amateur Radio Club Member
iTrader: (3)
 
Join Date: Jun 2010
Location: Ca
Posts: 4,713
Se7en is on a distinguished road
Default

Quote:
Originally Posted by Captain Kilowatt View Post
Start by tightening every nut, bolt, and screw you can find especially the bolts holding the transformer to the case and the bolts holding the transformer itself together. Tighten them as tight as you can as the metal plates in the transformer often vibrate when loose and can be quite loud.
thank you.
its a few db quieter still noisy but not as bad
__________________

Last edited by Se7en; 12-13-2011 at 01:17 PM.

Reply With Quote
  #5  
Old 12-13-2011, 09:09 PM
m42duster's Avatar
Senior Member
iTrader: (19)
 
Join Date: Jun 2009
Location: Southeast Ohio
Posts: 7,171
m42duster is on a distinguished road
Default

I have a big Tripp Lite that developed a bad power switch. Picked up a new switch and when I took the top off; I discovered that just about every screw and nut was loose.

Tightened everything down with thread locker.

Find some rubber padding or something to sit your supply on to help with dampening.

Reply With Quote
  #6  
Old 01-16-2012, 09:32 PM
Senior Member
iTrader: (0)
 
Join Date: Apr 2011
Posts: 148
KM3F is on a distinguished road
Default

If anyone is interested in why this conditon exists, here it is.
It depends on where in the AC cycle you last turned the power off.
This can leave the core magnetized.
The next time it is powered up the core presents a very low impedence to the AC input and causes it to draw more than normal current along with charging the filter and pulls on the metal cabinet hard. This amplifies the noise and moves anything that will move and contributes to shortened switch life.
This is why it does not happen every time.
The solution believe it or not is 'soft start' just like an amplifier has.
They are easy to make and install.
A SPST relay with contact rateing of at least 10 amps and a 25 ohm 25 watt resistor wired for a second or less time delay before the full application of AC power to the primary winding, will quiet it down.

Reply With Quote
  #7  
Old 01-17-2012, 07:28 AM
Captain Kilowatt's Avatar
Professional Amateur
iTrader: (1)
 
Join Date: Apr 2005
Location: Nova Scotia,Canada
Posts: 11,070
Captain Kilowatt will become famous soon enough
Default

Quote:
Originally Posted by KM3F View Post
If anyone is interested in why this conditon exists, here it is.
It depends on where in the AC cycle you last turned the power off.
This can leave the core magnetized.
The next time it is powered up the core presents a very low impedence to the AC input and causes it to draw more than normal current along with charging the filter and pulls on the metal cabinet hard. This amplifies the noise and moves anything that will move and contributes to shortened switch life.
This is why it does not happen every time.
The solution believe it or not is 'soft start' just like an amplifier has.
They are easy to make and install.
A SPST relay with contact rateing of at least 10 amps and a 25 ohm 25 watt resistor wired for a second or less time delay before the full application of AC power to the primary winding, will quiet it down.

That takes care of the start up but sometimes they will hummmmmm like a bugger during standby and get worse under load. It is for the same reason, circulating magnetic currents in the transformer, and can generally be cured by tightening all the bolts and mounting the transformer on a piece of rubber between it and the chassis. The soft start is a good idea on bigger supplies and I have been meaning to install one in my 40 amp Tripplite but keep procrastinating. Several years ago I had to replace the filter capacitor bank and decided that the 100,000 uF can I had would be good. Man that beast thumps like a bugger when I turn it on. Start up current must be through the roof.
__________________
There are 10 kinds of people in this world. Those that understand binary and those that don't.

Reply With Quote
  #8  
Old 01-17-2012, 10:49 AM
TonyV225's Avatar
W9WDX Amateur Radio Club Member
iTrader: (8)
 
Join Date: Apr 2005
Location: Wisconsin
Posts: 5,722
TonyV225 is on a distinguished road
Default

KM3F, You are correct as far as getting the massive inrush current thump taken care of and Ive actually seen older Palomar and other power supplies trip circuit breakers on power up. I understand what they are saying on the loud hum or vibration the supply is giving off.

Its not in the radio recieve like a bad filter cap would do its simply the whole powered up power supply making noise. Ive heard some that almost sounded like they were going to explode. I have a 65 amp that popped one night years ago it was sitting at an idle and pow that was it. I opened in and replaced a few caps but it still didnt work and another forum memeber has it and didnt have time to look at it so Ill be getting it back to look at again.

I remember when it happened I call triplite and they wouldnt repair it or sell parts but said " We will sell you a new one at a good deal" I thought it was a buncha horse $h!+. I remember mine also made a little noise a bit and I could never figure it out.
__________________
""""was not thinking of a cber sat with his makita screwdriver winding round the presets untill his meter said s9+60db from a guy on a handheld 15 miles away""""

Reply With Quote
Reply

Bookmarks
Worldwide Radio Forum



Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Astron power supply ahanway Tuners, Mics, Meters & other Accessories 13 10-08-2011 06:33 PM
Astron RS 35M kiser sosay Tuners, Mics, Meters & other Accessories 11 12-13-2009 02:35 PM
ASTRON CROP. TRIPLE A PLUS !! Switch Kit Announcements & Open Forum 0 08-27-2008 06:54 PM
Astron Power Supply problem Sonwatcher General CB Services Discussion 5 11-26-2007 02:50 PM
Noisy Pride DX-300 Moleculo Amplifiers 16 10-30-2005 11:51 PM


All times are GMT -7. The time now is 10:16 PM.


Powered by vBulletin®
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.6.0
Worldwide Radio Forum