No relays I know of, you can hear the transformer hum, a little more when
under a heavy load. It's not that loud, I can only hear it in here when it's
dead silent in here.
----- Original Message -----
From: "Colin McDonald" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Tuesday, October 14, 2008 11:30 AM
Subject: Re: DC Power Supply Roar
> so is the "roar" a hum, a hiss, a rapid clicking like a relay?
> i'm not sure, but if the astron rm35a doesn't have a fan, there should be
> little to no noise even at a 35 amp draw....the transformer will hum a
> little, but no more then a little. Are there relays in the astron
> supplies?
> 73
> Colin, V A6BKX
> ----- Original Message -----
> From: "John Miller" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Tuesday, October 14, 2008 7:53 AM
> Subject: Re: DC Power Supply Roar
>
>
>>
>> There isn't an internal fan on astron power supplies except maybe the
>> switching ones.
>> ----- Original Message -----
>> From: "Colin McDonald" <[log in to unmask]>
>> To: <[log in to unmask]>
>> Sent: Tuesday, October 14, 2008 12:04 AM
>> Subject: Re: DC Power Supply Roar
>>
>>
>> > the internal fan.
>> > 73
>> > Colin, V A6BKX
>> > ----- Original Message -----
>> > From: "Steve Forst" <[log in to unmask]>
>> > To: <[log in to unmask]>
>> > Sent: Monday, October 13, 2008 9:56 PM
>> > Subject: Re: DC Power Supply Roar
>> >
>> >
>> >>
>> >> Bob,
>> >>
>> >> I've had an RS-20A for over 20 years and an RS-35A
>> >> for 7 years. Both can be noisy and there is a vibration you can
>> >> feel
>> >> if
>> >> you touch the top cover. I've found that just moving it around a
>> >> bit
>> > can
>> >> reduce any noise, although I've never experienced the roar you
> describe.
>> >> They also both clunk pretty good when powered up.
>> >>
>> >> 73, Steve KW3A
>> >>
>> >> ----- Original Message -----
>> >> From: "Bob Martin" <[log in to unmask]>
>> >> To: <[log in to unmask]>
>> >> Sent: Monday, October 13, 2008 8:13 PM
>> >> Subject: DC Power Supply Roar
>> >>
>> >>
>> >> > Earlier today, my almost new ASTRON 35 developed a really loud roar
>> > under
>> >> > load. It had been on receive for 2 or 3 hours. Then, At 5 Watts
>> > transmit
>> >> > on FM, it was hardly noticed. At about 40 Watts it is quite lout
> and
>> > at
>> >> > 100 continuous it can be heard throughout the entire basement. Just
>> >> > now,
>> > I
>> >> > turned it on and went through the cycle noted above with no noise
>> >> > heard.
>> >> > In
>> >> > stand-by I can't hear it at all now but when I was experiencing the
>> >> > problem,
>> >> > I could feel it vibrating ever so slightly. Will try it before I
> turn
>> > in
>> >> > tonight.
>> >> >
>> >> > Any thoughts?
>> >> >
>> >> > 73
>> >> > Bob Martin
>> >> > KC3FI
>> >> >
>> >> >
>> >> > EchoLink Node - 55127
>> >> > Please visit http://www.wan-leatonks.net.
>> >> >
>> >>
>> >>
>> >> --
>> >> No virus found in this incoming message.
>> >> Checked by AVG.
>> >> Version: 7.5.524 / Virus Database: 270.8.0/1722 - Release Date:
>> >> 10/13/2008
>> > 7:50 AM
>> >>
>> >>
>>
>>
>> --
>> No virus found in this incoming message.
>> Checked by AVG.
>> Version: 7.5.524 / Virus Database: 270.8.0/1722 - Release Date:
>> 10/13/2008
> 7:50 AM
>>
>>
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