- Original Message -
From: Henry Foglesong hwfogles...@gmail.com
To: drakelist@zerobeat.net
Sent: Monday, August 22, 2011 8:45 PM
Subject: [Drakelist] Cooling fan
I hear conflicting opinions about the advisability of using
a cooling fan (eg: muffin fan) on top of the finals of T-4XB
Hi Henry,
I was surprised some time ago after a session of CW operating with my T-4X at
the amount of heat that was being radiated upward from the cage containing the
final PA tubes! (if you look inside that enclosure, you'll see that those RF
amplifiers share some very close quarters)...
On
Hank -
Any opinions in this group?!?!?!! :-)
You have received excellent advice, as usual, from the members of this group. One comment I did not
see mentioned is that while the top mount of a fan is certainly easiest, there's not always
clearance under a shelf. Yeah, I know you're supposed
Use one on top of the final cage pulling the air UP and
out. Suggest a surplus 220V fan operated on 120. Quiet and
easy. A 24V DC fan on 12V works as well
It will extend your final life especially under heavy duty
cycle modes (RTTY) etc.
73
Gene K1NR
On Tue, 23 Aug 2011 03:45:42 -
Sent this earlier but it bounced as a fwd.
Yes..one of the better reasons for having the fan on the back is so it
WILL stay cool under a shelf.
Fans are excellent idea...even on the rx. They dont have to be on top
to work well. m mounted on the rear of the finals cage pulling air out
works
In the for what it's worth department - I used to hold a muffin fan ATOP
my SB-220 and SB-200, with a pair of toothpicks. It made NO permanent
holes, held the fan where it did some good, AND I had it sucking out, as
opposed to blowing in. Any physics or fluid-mechanics guy will tell you
that
- Original Message -
From: TC Dailey daileyservi...@qwest.net
To: drakelist@zerobeat.net
Sent: Tuesday, August 23, 2011 11:38 AM
Subject: [Drakelist] Cooling Fans
In the for what it's worth department - I used to hold a
muffin fan ATOP my SB-220 and SB-200, with a pair of
Wow, the score is about 15 to 0 in favor of cooling fans. I guess the guys
that gave me the negatives a number of years ago when I owned a T-4XB aren't a
part of this list!!
Thanks for all the comments, and yes, I have a cooling fan and will be
installing it on my newly purchased T-4XC.
Hi Richard:
It is nice now that a lot of the gamers and power PC users want to run
silent cooling systems in their machines. Many of the PC fan mfgs rate
airflow as well as noise in dB. Silenx utilizes the same blade modeling
algorithms previously used for SSBN Boomer propellors. Quietest
I really can't think of a single negative to a cooling fan other than
the noise from whatever fan you use. I suppose some could say they are
needed since these rigs lasted dozens of years without them, but heat is
the enemy of tubes and all the rest of the works. Really quiet,
inexpensive
...circling around and around...
Moved the (new) filter caps up out of the way and grounded them to the
grounding stud on the rear panel. Chirp, chirp, chirp! Up - down - up - down,
chirp!
Monitored Lo @ 18.1 MHz on my K3 - solid signal even while the R-4A was happily
chirping away...
Steve,
Is the chirping clocked or more free running in nature?
Ron
--- On Tue, 8/23/11, Steve Wedge w1es1...@earthlink.net wrote:
From: Steve Wedge w1es1...@earthlink.net
Subject: [Drakelist] I feel like a buzzard...
To: drakelist@zerobeat.net
Date: Tuesday, August 23, 2011, 7:20 PM
I advertised for a T-4XC front panel on the Australian VKHam classified
website and immediately received an Email response from somebody supposedly
located at: 46 medomak mobile home park waldoboro,me 04572 offering either
the T-4XC or just the front panel, claiming he has tried to sell the
At 07:20 PM 8/23/2011, you wrote:
.
Could the power supply be starving even though the xtal oscillator is not
changing at all?
73,
Steve Wedge, W1ES/4
I dunno Steve, but THANK YOU for taking the time to post all this... it's
like watching Hercule Poirot on the trail.
I'm really
completely random. Gets worse if I tap on it, but then again, I'd expect some
reaction when tapping it. Now, I've got to find some test leads. I'm going to
turn my station supply down to 11V so I can still run the K3 and will power
each PTO off this very stiff supply.
It's now obvious to me
This has certainly been a challenge, complete with a couple of false
climaxes.
Don't think I'll get much more time tonight to play with this, as my XYL
will be home soon and we'll have to eat.
Next is to try running an external 11V supply to the PTO. If it still
warbles, I'll have to
John,
There are 26 amateurs in Waldoboro, ME. None at that address (not that it means
anything).
His residence was assessed for USD13,ooo. Personally, I wouldn't take the
chance even though I could drive up there and put the fear of God in him if he
chose to deal me out of the money.
I hear conflicting opinions about the advisability of using a cooling fan
(eg: muffin fan) on top of the finals of T-4XB and XC transmitters
Every 10 deg C reduction in heat, doubles the life of electronic
components. Not sure if this applies to tubes as well, but I'd suspect so.
John
What will happen if I attempt to use a 5 to 6 Mhz (actual coverage) crystal in
the R4A? Will there be any reception at all, strange noise or will the radio
explode? :)
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