I put two 120 volt fans in series in one cabinet.
Nice and quiet with a gentle air flow.
John J. Riddell wrote:
Kevin, another method of slowing down an AC fan is to put a capacitor
in series with the AC leads as a voltage dropping element.
* A local Ham played with this idea many
: Sunday, December 21, 2008 9:38 AM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Re: fan timer circuit
Maybe it's just me, but I've never understood the need for a special circuit
to run cooling fans.
I run my fans from the PTT line using a relay. I have also used a simple
, December 21, 2008 9:38 AM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Re: fan timer circuit
Maybe it's just me, but I've never understood the need for a special circuit
to run cooling fans.
I run my fans from the PTT line using a relay. I have also used a simple
chassis
Perfect Joe, just what I have been looking for.
tom
[Original Message]
From: Joe k1ike_m...@snet.net
To: Repeater-Builder@yahoogroups.com
Date: 12/21/2008 10:05:17 PM
Subject: Re: [Repeater-Builder] Re: fan timer circuit
This is a simple timer that I used on my 222 repeater. When
Re: fan timer circuit
I've seen a number of fan delay, time on, time off circuits
posted on web. The neat'o web page url I just posted here
on the group has one and it might be the one you're looking
for.
http://www.w1ghz.org/small_proj/small_proj.htm
and the fan controller
- Original Message -
From: skipp025 skipp...@yahoo.com
To: Repeater-Builder@yahoogroups.com
Sent: Sunday, December 21, 2008 12:24 PM
Subject: [Repeater-Builder] Re: fan timer circuit
Re: fan timer circuit
I've seen a number of fan delay, time on, time off circuits
posted on web
At 12/21/2008 09:24, you wrote:
Some of our local start-up radio clubs throwing repeater
packages in place often start out using and stay with an
external RF amplifier designed for mobile operation. Sometimes
the amp runs so hot you can't keep your hand on the heat sink
but I've yet to see one
-
From: skipp025 skipp...@...
To: Repeater-Builder@yahoogroups.com
Sent: Sunday, December 21, 2008 12:24 PM
Subject: [Repeater-Builder] Re: fan timer circuit
Re: fan timer circuit
I've seen a number of fan delay, time on, time off circuits
posted on web. The neat'o web page url I just
: wb6fly wb6...@verizon.net
To: Repeater-Builder@yahoogroups.com
Sent: Sunday, December 21, 2008 4:27 PM
Subject: [Repeater-Builder] Re: fan timer circuit
I mostly agree. My thinking is that a fan that runs continuously
wastes power and draws dust and dirt into the equipment. I also
believe
One Summer's day in Los Angeles I had a service
call on a microwave repeater (vacuum tube).
It was located in a warehouse, near the roof.
In the heat I lugged my stuff up the stairs.
As I set down the service monitor I leaned
my other arm against the cabinet. I jerked
it away because it was
Sounds like the best thing to do is a combination of both the PTT and
Thermodisk versions together.
That way the fan starts blowing when users start using the repeater.
Then the thermodisk takes over after it heats up until all traffic quits and
the tx'er cools down.
Just my 2c worth.
Merry
At 12/21/2008 14:01, you wrote:
I moved over to utilizing the PTT instead of the thermostat disks after I'd
had a few thermostats fail. But I agree with your thinking.
My thoughts as well: the thermostat is an elegant solution, but if it
fails, your repeater fails in a rather expensive way. One
n...@no6b.com wrote:
One reason why I've dismissed using any switching on my 110 V cooling fans
let them spin 24/7.
I have used 220 V muffin fans on 110 V and they last for years. I put
one in service in 1997, and it's still turning.
Kevin
to the fan.
73 John VE3AMZ
- Original Message -
From: Kevin Custer
To: Repeater-Builder@yahoogroups.com
Sent: Sunday, December 21, 2008 8:58 PM
Subject: Re: [Repeater-Builder] Re: fan timer circuit
n...@no6b.com wrote:
One reason why I've dismissed using any switching
One more thing to be careful of when using fans on remote equipment.
Make sure there are guards on both sides of the fan. We had a muffin
fan on a 100wt 220 amp that failed when a mouse tried to get closer to
the warm heatsink. His carcass jammed the fan blades and got dessicated
with the
m...
From: Repeater-Builder@yahoogroups.com
[mailto:repeater-buil...@yahoogroups.com] On Behalf Of Burt Lang
Sent: Sunday, December 21, 2008 10:39 PM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Re: fan timer circuit
One more thing to be careful of when
a mouse tried to get closer to
the warm heatsink. His carcass jammed the fan blades and got dessicated
with the heat.
Burt Lang VE2BMQ
Yes I guess that could Happen , I live in a City and My 6 Month old
Fridge quit working , Well of Course bring a Ham Some of us including
Me thing We can
So how much are they charging for the timer board?
Also... most repeater controllers have available logic
output lines, which can easily toggle a fan.
skipp
KB6ZOP [EMAIL PROTECTED] wrote:
One of these?
http://www.elkproducts.com/products/elk-960.htm
-Original Message-
-I think I paid about $25 plus shipping. True, the logic can run the
fan while the repeater is keyed up, but I needed a timer to keep the
fan on, in this case 6 minutes, to let the PA cool down. I'm using a
75W UHF Mitrek running about 50W, so the additional air flow keeps
things from frying.
]
To: Repeater-Builder@yahoogroups.com
Sent: Friday, April 14, 2006 3:38 PM
Subject: [Repeater-Builder] Re: Fan timer
-I think I paid about $25 plus shipping. True, the logic can run the
fan while the repeater is keyed up, but I needed a timer to keep the
fan on, in this case 6 minutes, to let
At 03:56 PM 2006/04/14 -0400, you wrote:
Maybe I'm missing something here, but I've never subscribed to the theory of
having fans run beyond PTT. What purpose does it serve? The transistors are
generating heat only when they are on. As soon as they are off they
begin to cool down on their
14, 2006 2:05 PM
Subject: [Repeater-Builder] Re: Fan timer
So how much are they charging for the timer board?
Also... most repeater controllers have available logic
output lines, which can easily toggle a fan.
skipp
KB6ZOP [EMAIL PROTECTED] wrote:
One of these?
http
I on the other hand run my fans 24/7,why switch them at all? 28 years
with the same PA transistors,I guess GE had the right idea! 73,Lee
Chuck Kelsey wrote:
Maybe I'm missing something here, but I've never subscribed to the theory of
having fans run beyond PTT. What purpose does it serve?
To me that makes more sense than running them for XX minutes after PTT.
Chuck
WB2EDV
- Original Message -
From: Lee Williams [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent: Friday, April 14, 2006 4:16 PM
Subject: Re: [Repeater-Builder] Re: Fan timer
I on the other hand
, April 14, 2006 4:10 PM
Subject: Re: [Repeater-Builder] Re: Fan timer
At 03:56 PM 2006/04/14 -0400, you wrote:
Maybe I'm missing something here, but I've never subscribed to the theory
of
having fans run beyond PTT. What purpose does it serve? The transistors
are
generating heat only
--- Lee Williams [EMAIL PROTECTED] wrote:
I on the other hand run my fans 24/7,why switch them
at all? 28 years
with the same PA transistors,I guess GE had the
right idea! 73,Lee
Chuck Kelsey wrote:
Maybe I'm missing something here, but I've never
subscribed to the theory of
Chuck Kelsey wrote:
Maybe I'm missing something here, but I've never subscribed to the theory of
having fans run beyond PTT. What purpose does it serve? The transistors are
generating heat only when they are on. As soon as they are off they
begin to cool down on their own. If the fans are
Lee Williams wrote:
I on the other hand run my fans 24/7,why switch them at all?
Many repeater locations are very dirty. Running fans when there is
nothing to cool just circulates the dust and dirt and deposits more of
it inside your equipment. Many folks haven't re-discovered the
At 4/14/2006 16:16, you wrote:
Chuck Kelsey wrote:
Maybe I'm missing something here, but I've never subscribed to the
theory of
having fans run beyond PTT. What purpose does it serve? The transistors
are
generating heat only when they are on. As soon as they are off they
begin to cool
29 matches
Mail list logo
