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I am going to experiment with a temp controlled fan controller along
with opening the fan intake to reduce back pressure. Paul, W1GHZ has a nice little fan controller project that I am going to
incorporate into the mod. It is well thought out and documented. It has a
remote temp sensor that can be mounted on the heat sink and a high temp indicator
LED (150 F) that I am going to put on the front panel (I really like this
feature). At ambient temperatures, it does slow the fan down and raises the
speed (no on/off switching) as the temperature increases. You can check out his projects here: http://www.w1ghz.org/small_proj/small_proj.htm -Tim --- Integrated Technical Services ( http://www.itsco.com ) -----Original Message----- If the main problem is cause by volume restrictions, the solution is not to slow the fan and deprive the unit of cooling. The proper solution is to increase airflow, by reducing restrictions and back pressure on the air flow of the system. You did the right thing. A fan running with reduce speed is more prone to stalling and causing a catastrophic failure of the RF amplifier later on when it gets a little gummed up. At 08:27 AM 11/16/2005, you wrote: >Content-class: urn:content-classes:message >Content-Type: multipart/signed; >boundary="----=_NextPart_000_0014_01C5EA8F.F80BE840"; >protocol="application/x-pkcs7-signature"; micalg=SHA1 > >True, but the fan in the SDR1k needs an 80mm X 15mm format (very thin)
and I >could not find one in that format that had the temp sensors that
were not >10-20 dBA louder than the fan currently installed. > >-Tim >--- > >Integrated Technical Services ( http://www.itsco.com ) > > >-----Original Message----- >From: [EMAIL PROTECTED] >[mailto:[EMAIL PROTECTED] On Behalf Of Tom Clark,
W3IWI >Sent: Wednesday, November 16, 2005 12:18 AM >To: Paul Wade W1GHZ >Cc: FlexRadio@flex-radio.biz >Subject: Re: [Flexradio] A simple fan noise abatement modification > >Paul Wade W1GHZ wrote: > > another way to reduce fan noise is to reduce the speed of the
fan. > > one of my recent projects is a fan controller with speed
proportional > > to temperature, with the temp sensor wherever you like. >A number of 12VDC computer fans (I'm looking at one right now
branded >"ThermalTake") come with speed control capabilities built
in -- either >from a pot or a thermistor that they supply with the fans. I use
the >pot variety on my PC and "tune" the speed for minimum
noise. > >73, Tom > >_______________________________________________ >FlexRadio mailing list >FlexRadio@flex-radio.biz >http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz > > >_______________________________________________ >FlexRadio mailing list >FlexRadio@flex-radio.biz >http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz > >No virus found in this incoming message. >Checked by AVG Free Edition. >Version: 7.1.362 / Virus Database: 267.13.3/172 - Release Date:
11/15/2005 Cecil Bayona KD5NWA www.qrpradio.com "I fail to see why doing the same thing over and over and getting
the same results every time is insanity: I've almost proved it isn't; only a few more tests now and I'm sure results will differ this time
... " |
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