[Collins] Re: [Collins]The best way to cool a M2

Fri, 18 Apr 2003 08:56:01 -0400

First , dont forget blowing fresh air from the front of the fan is 10 times
more efficient for cooling  due to  air velocity .
Dont forget there is nothing heat  susceptible inside the PA cage ....there
ARE  already NOT LESS  than 10 big holes around each 6146.....to help
natural convection ...going UP ....
According to me the most critical part needing cooling is the bottom of the
chassi where all the resistors are cooking
THE PTO  and all the Crystals   like on the frying pan .....If after one
hour or 2  you slide your fingers down the back of the PTO all the way down
so the tip of your finger are touching the chassi you will almost burn
yourself and the bracket holding the back of the PTO is conducting heat from
the chassi to the PTO .....if I do the same test with mine it  is JUST WARM
 I am only using the 6.3 VAC from the back RCA jack ( Automatically switch
ON and OFF with the M2 ) to power a 48 VDC regular Muffin fan (  4 by 4 by
1 ) using one diode and one small 5000 Mfd 25 VDC cap to provide about 9
VDC  to power the fan ......this way there is NO NOISES and the cooling is
VERY EFFICIENT BLOWING  IN .....my fan is located under the center of the
chassi blowing under the holes of the cabinet .......In order to do so I had
to extend the feets by using 4  Kodak 35 millimeter film black boxes ....you
drill a hole in the bottom of the Kodak  and screew the feets inside the
upside down boxes.  you close the boxes with the covers ....
73 and good luck to all
Yves Wn4i

----- Original Message -----
From: "Ray V." <[email protected]>
To: "David Knepper" <[email protected]>
Cc: "Jose Vicente" <[email protected]>; <[email protected]>
Sent: Friday, April 18, 2003 7:37 AM
Subject: Re: [Collins] Boat Anchor Fans

> Dave,
>
> Are you saying this "Boatanchor Cooler" fan system creates a total
> vacuum inside the Collins gear? I would think that if the fan is an
> exhaust system, removing air from the Collins gear, then external air
> would have to re-enter the Collins gear to replace what is removed. I
> would think that, unless the COllins gear is fully enclosed within a
> filtering system, then whatever air re-enters could bring with it the
> dust, etc. How does the "Boatanchor Cooling" system filter the incoming
> air to replace the exhausted air?
>
> I use the exhaust method as well, a simple $3.00 115vac muffin fan
> sitting on top of my KWM-2 and KWM-2A over the HV section drawing air up
> and out, with little rubber bumper feet for protection of the case
> surface. This keeps the rig totally cool but of course I do keep an eye
> on the insides for dust buildup etc.
>
> 73, Ray  W2EC
>
> David Knepper wrote:
>
> > The fans that are part of the "Boatanchor Cooler" system are exhaust
fans
> > that take warm air from inside the Collins and exhaust it outside the
unit.
> > No dirt, etc. can get inside the Collins as a result of the fan.
> >
> > Jose, you need to turn your fan around!
> >
> > David Knepper - W3ST
> > Secretary to the Collins Radio Association (CRA)
> > Publisher of the Collins Journal
> > www.collinsra.com
> > CRA station call - W3CRA
> > ----- Original Message -----
> > From: "Jose Vicente" <[email protected]>
> > To: <[email protected]>
> > Sent: Thursday, April 17, 2003 1:49 PM
> > Subject: Re: [Collins] Boat Anchor Fans
> >
> >
> >
> >>WARNING:
> >>
> >>I did my own fan for my Collins KWM-2, it worked great, BUT soon
> >>the KWM-2  was clogged with dust,  any fan need a filter to prevent
this.
> >>Be sure you have one.
> >>
> >>73, Jose   PY2AUC
> >>
> >>
> >>At 01:14 AM 4/17/03 -0400, you wrote:
> >>
> >>>I > received a set of fans from K4ZRD a couple of weeks ago and set
them
> >>>up on
> >>>
> >>>>my 32S-3, 30L-1 and a KWM2A.  They worked great and appear to drop the
> >>>>temperature quite a bit.  The installation was simple and the fans sit
> >>>>
> > on
> >
> >>>>top of the equipment so you do not have to modify anything to use
> >>>>
> > them.
> >
> >>>>Carl did a great job building a small good looking power supply for
> >>>>
> > the
> >
> >>>>fans.  Take a look at his ad in the next Collins Journal or contact
> >>>>
> > him
> >
> >>>>direct.   I plan to get another set for my other old time tube
> >>>>
> > equipment.
> >
> >>>>No, he did not pay me to post this.  I was just very impressed with
> >>>>
> > the
> >
> >>>>workman ship and the easy installation.
> >>>>73s  Steve WB6KWL
> >>>>
> >>Sponsored by the Collins Radio Association
> >>http://www.collinsra.com
> >>
> >
> > Sponsored by the Collins Radio Association
> > http://www.collinsra.com
> >
> >
>
>
> Sponsored by the Collins Radio Association
> http://www.collinsra.com