RE: [drakelist] TR7 fan recommendation?

[Jim Shorney]

"Jim Shorney" <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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On Mon, 21 Nov 2005 07:14:29 -0500 (EST), Ron Wagner wrote:

>My guess is that Drake never figured you to run high duty cycle modes 
>while mobile.  I would think a RTTY or Slow Scan setup a bit big for 
>a mobile installation in the late 70s :-)  Then again what do I know.

That's probably a good guess, Ron, although the hams at Drake should
have known that hams in the real world are likely to try just about
anything. I'm waiting for Mike to chime in on this one.

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RE: [drakelist] TR7 fan recommendation?

[Ron Wagner]

Ron Wagner <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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My guess is that Drake never figured you to run high duty cycle modes 
while mobile.  I would think a RTTY or Slow Scan setup a bit big for 
a mobile installation in the late 70s :-)  Then again what do I know.

73, Ron WD8SBB


I never understood the AC fan bit. A DC fan can easily be powered from
the radio, base or mobile. An AC fan is a doorknob if running mobile.
Maybe they were just a lot cheaper at the time.


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Re: [drakelist] TR7 fan recommendation?

[K9SQG]

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Floyd,

I use 220vac fans that will start on 110v.  Quiet and works well on TR-7 and 
L-7 PS.

73s,

Evan
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RE: [drakelist] TR7 fan recommendation?

[Jim Shorney]

"Jim Shorney" <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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On Sun, 20 Nov 2005 18:22:48 -0500, Ron Baker wrote:

>"Ron Baker" <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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>For a quiet fan, consider using a DC fan equivalent.   Use a 12VDC fan if
>you want full air flow.   If you want air flow and a very quiet fan try
>installing a 24VDC fan running at 12 VDC.   The fan still provides decent
>air flow and is quiet to a point of not being heard.   I put the 24VDC fans
>on both my TR7 and TR5 and its works great for me.

I've got a Dayton 4C765, same form factor as the FA7, 24v 130 mA, ball
bearing, brushless, 35CFM. It still moves a fair amount of air at 12v.
Too bad mine has noisy bearings, it's a nice little fan. I figured out
how to take it apart, a little Mobil 1 in the bearings helped a bit. If
I could find some replacement bearings that are the right size, I'd use
it.

I never understood the AC fan bit. A DC fan can easily be powered from
the radio, base or mobile. An AC fan is a doorknob if running mobile.
Maybe they were just a lot cheaper at the time.



-- 
Jim Shorney  -->.<--Put complaints in this box
jshorney (at) inebraska.com
Ham Radio NU0C
Lincoln, NE, USA
EN10ps
http://incolor.inetnebr.com/jshorney/

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RE: [drakelist] TR7 fan recommendation?

[Ron Baker]

"Ron Baker" <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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For a quiet fan, consider using a DC fan equivalent.   Use a 12VDC fan if
you want full air flow.   If you want air flow and a very quiet fan try
installing a 24VDC fan running at 12 VDC.   The fan still provides decent
air flow and is quiet to a point of not being heard.   I put the 24VDC fans
on both my TR7 and TR5 and its works great for me.

Ron / WB4HFN

 

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Floyd Sense
Sent: Sunday, November 20, 2005 5:18 PM
To: drake
Subject: [drakelist] TR7 fan recommendation?


"Floyd Sense" <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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I ran my TR7 from a PS7 for the first time today and the fan that's on the
TR7 makes too much noise (it's not the Drake fan).  Has anyone found a
relatively quiet fan?  I suppose I could always install a 12V fan and then
slow it down as required, but maybe there's a quiet AC fan available?

73, Floyd - K8AC 

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Re: [drakelist] TR7 fan recommendation?

[john]

john <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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I had the same issue w/a 12V fan. I put a series string of diode drops to 
about 9V inline and it's now quiet, but moves adequate air...


73
John K5MO


At 05:18 PM 11/20/2005, Floyd Sense wrote:


"Floyd Sense" <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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I ran my TR7 from a PS7 for the first time today and the fan that's on the 
TR7 makes too much noise (it's not the Drake fan).  Has anyone found a 
relatively quiet fan?  I suppose I could always install a 12V fan and then 
slow it down as required, but maybe there's a quiet AC fan available?


73, Floyd - K8AC
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Re: [drakelist] TR7 fan recommendation?

[Garey Barrell]

Garey Barrell <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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The original Drake FA-7 was a Comair/Rotron "Sprite" model SU2C1..

It runs at 1900rpm, producing 20cfm, and a "noise rating" of 26.2dba (VERY 
quiet!)
You can buy them BRAND NEW, from many electronic supply houses, such as 
Digi-Keyfor about $28.00 with the AC power cord already attached...

AND, I've seen them at hamfests, "used, but working" for about $3 to $4.

12VDC fans are much more available surplus (cheap) these days thanks to computers.  Some are quiet, some are not.  Running a noisy one on less than 12V cuts the noise considerably.  


The TR-7 doesn't need a LOT of air, just something to  _EXTRACT_  warm air from 
the heatsink and push it away from the radio.

73, Garey - K4OAH
Atlanta

Drake C-Line Service Manual




Floyd Sense wrote:



"Floyd Sense" <[EMAIL PROTECTED]> made an utterance to the drakelist 
gang

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I ran my TR7 from a PS7 for the first time today and the fan that's on 
the TR7 makes too much noise (it's not the Drake fan).  Has anyone 
found a relatively quiet fan?  I suppose I could always install a 12V 
fan and then slow it down as required, but maybe there's a quiet AC 
fan available?


73, Floyd - K8AC


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