[ICOM] Need parts.

[Gary Fiber]

Take a look at how the air flow is directed through the heat sink. If 
I remember correctly the fax sucks air out of the chassis but is 
about an inch away from the heat sink which is built a bit like an 
auto radiator. The solid parts where the modules mount, the center of 
the heat sink being built with cross fins.

Once at Icom testing a RP-4020 another made a shroud out of cardboard 
for testing, sealing the area between the fan and heat sink. Thus 
drawing all the air through the heat sink before exiting the 
repeater. Would you know it the fan actually cycled on and off. 
Seemed before it ran all the time. The heat sink was cool to the 
touch  He used to turn the fans around to force air into the chassis 
trying to force better cooling onto the heat sink. If you are 
reasonably good with bending up some sheet metal you might try making 
such a shroud. It just might improve the heat sink operation and 
brick cooling. Looked like a automotive radiator fan shroud. Big at 
the fan funneling down to match the heat sink end.

Just be careful you don't short anything out. So far as I remember 
the heat sink is ground so touching it with a sheet metal shroud 
should not hurt anything but a voltmeter will verify my thought there.

Have a look the RP-1220 could be built differently than the RP-4020 was.

Gary K8IZ

At 03:58 PM 9/25/2009, you wrote:

>There are two modules in the repeater.  One drives (IIRC) from 10mw 
>to 1w.  The
>second goes 1 watt to 10 watts.
>
>Both are available at RF parts.  Expensive - but available.  The repeater will
>be back on the air by next week.
>
>Hiking with a 30 pound repeater on my back will not be fun....  But it will be
>back on the air.
>
>Thanks Gary.  We will investigate the module - and perhaps keep it as a spare.
>
>Mike - KD9KC.
>El Paso, Tx.
>DM61rt
>
>Molon labe. [mo-lone lah-veh] Google it...
>
>=============================================
>The United States Constitution (c) 1791. All Rights reserved.
>=============================================
>
> > -----Original Message-----
> > From: icom-bounces at mailman.qth.net
> > [mailto:icom-bounces at mailman.qth.net] On Behalf Of Gary P. Fiber
> > Sent: Friday, September 25, 2009 8:28 AM
> > To: ICOM Reflector
> > Subject: Re: [ICOM] Need parts.
> >
> > Yes sometimes that works and sometimes not. If the bricks are
> > bad there
> > is nothing to loose.
> > I hope Mike can find replacements. I wonder if there is
> > enough drive to
> > place an out board amp on the repeater. That would take the
> > place of the
> > two bricks.
> >
> > Gary K8IZ
> >
> > Bill NY9H wrote:
> > > i've gone into the bricks, as Gary suggests....
> > > I 've found that the ceramic has cracked, cracking a trace.....
> > >
> > > I've overflowed the broken trace..with solder gun .... TADA
> >   fixed,,,,
> > >
> > > However I had to go back a second time, and this time placed a #20
> > > solid conductor
> > >   across the broken trace...  that was 8 years ago,,,,works
> > great ...
> > >
> > > Rather than buying new modules, i started buying up used IC28A...
> > >   for abt the same price as a module. Now I have several
> > > transceivers/recievers & spares,.,,
> > >
> > > bill
> > >
> > > visit my station @
> > > http://picasaweb.google.com/Bill.SteffeySr/HamRadioNY9H
> > >
> > > ----
> > > Your Moderator: Dick Flanagan K7VC: icom-owner at mailman.qth.net
> > > Icom Users Net: Sundays, 1700Z, 14.316 MHz
> > > Icom FAQ: http://www.qsl.net/icom/
> > > To support QSL/QTH.net: http://www.qsl.net/donate.html
> > >
> > >
> >
> > ----
> > Your Moderator: Dick Flanagan K7VC: icom-owner at mailman.qth.net
> > Icom Users Net: Sundays, 1700Z, 14.316 MHz
> > Icom FAQ: http://www.qsl.net/icom/
> > To support QSL/QTH.net: http://www.qsl.net/donate.html
>
>----
>Your Moderator: Dick Flanagan K7VC: icom-owner at mailman.qth.net
>Icom Users Net: Sundays, 1700Z, 14.316 MHz
>Icom FAQ: http://www.qsl.net/icom/
>To support QSL/QTH.net: http://www.qsl.net/donate.html

Gary Fiber K8IZ
GROL PG-19-6691
Washington State Resident