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Re: [RFI] Aquarium Heater

To: <rfi@contesting.com>
Subject: Re: [RFI] Aquarium Heater
From: Bob Turner <n2scj@msn.com>
Date: Thu, 10 Feb 2011 11:12:28 -0500
List-post: <rfi@contesting.com">mailto:rfi@contesting.com>
Thanks for all the comments.  This a summary.

1) they can be noisy
2) they can be quiet - possible quiet brands are Hagen Tonic, and Superior

My plan is to confirm the PetSmart money back guarantee has no questions 
asked.  Try a heater in a bucket of water, if it is quiet I'm good to go. 
If noisy, take it back and get a different brand/model.  They had about 20 
heaters on display, one is probably quiet.  If I can't find a quiet one, 
then I'll pass on the fish hobby as my radio hobby takes precedence.


-----Original Message----- 
From: Pete Smith
Sent: Thursday, February 10, 2011 10:14 AM
To: rfi@contesting.com
Subject: Re: [RFI] Aquarium Heater

OTOH, if the heater's thermostat is a standard thermo-mechanical type,
you probably don't need to know all that.  I tracked down a noise source
a few years ago that turned to be an older, heated dog dish.  The owner
replaced it with a new one of the same type, and the noise went away.
You could hear the contacts arcing.

73, Pete N4ZR

The World Contest Station Database, updated daily at www.conteststations.com
The Reverse Beacon Network at http://reversebeacon.net, blog at 
spots at telnet.reversebeacon.net, port 7000

On 2/10/2011 10:02 AM, Peter Laws wrote:
> On Thu, Feb 10, 2011 at 02:05, Jim Brown<jim@audiosystemsgroup.com> 
> wrote:
>> On 2/9/2011 5:42 PM, KD7JYK DM09 wrote:
>>> Out of curiosity, how much RFI can a piece of nichrome wire produce?
>> You're asking the wrong question. Some of the right questions are, "what
>> is the nature of the current source for the heating element, what is the
>> waveshape, what is the spectra, and what is the enclosed area of the
>> loop that carries that current?" And, as others have suggested, the same
>> questions should be asked about the thermostat.
> The guy at the fish store will NOT know these answers.  :-D
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