[Icom] PS-125 Mods

Sun, 9 Feb 2003 19:11:05 -0500

Could you have simply changed out the fan without adding the resistor and
had it operate properly and quieter ??
Malcolm, K3KZ
----- Original Message -----
From: "kevin schuchmann" <[email protected]>
To: <[email protected]>
Sent: Sunday, February 09, 2003 2:04 PM
Subject: Re: [Icom] PS-125 Mods


> Hi Dave,
>     another mod  which I like better  is putting a 6.8 1w zener across
Q14, Q14 is the control transistor for the fan,
> this way the fan runs all the time but at a low quiet level, then if
things really  get hot Q14 conducts and the fan can still go to
> full speed...
>
>
> btw this idea was wa2rpi's,   and has worked well here for about a year...
>
> 73's
> Kevin
> wa6fwf
>
> ----- Original Message -----
> From: "David Hammond" <[email protected]>
> To: "ICOM Reflector" <[email protected]>
> Sent: Sunday, February 09, 2003 10:01 AM
> Subject: [Icom] PS-125 Mods
>
>
> > Hi Everyone,
> >
> > Having recently acquired a PS-125 from a fellow who got one with his new
Pro
> > II and did not need it, I decided to see if I could improve on the noisy
fan
> > commented on by many of late.
> >
> > Following Matt-KK5DR's mod I installed a 50 ohm 3 watt resistor in the
> > supply line of the fan but I also replaced the fan (per the latest
review in
> > Eham) with a Mouser #664-D6020MX-12V, a drop-in substitute for the
original
> > fan in the unit at a cost of $9.62.
> >
> > It is an easy mod but is tedious with several dozen screws to remove to
gain
> > access.
> >
> > Results?  Greatly improved and reduced fan noise with the modified
PS-125.
> >
> > I am very pleased with these mods and the PS-125 supply overall.
> >
> > 73 de N1LQ-Dave
> >
> >
> > ----
> > Your Moderator: Dick Flanagan W6OLD, [email protected]
> > Icom Users Net: Sundays, 1700Z, 14.315 MHz
> > Icom FAQ: http://www.qsl.net/icom/
> >
>
>
> ----
> Your Moderator: Dick Flanagan W6OLD, [email protected]
> Icom Users Net: Sundays, 1700Z, 14.315 MHz
> Icom FAQ: http://www.qsl.net/icom/
>