BE VERY CAREFUL....In many (most?) of the 4 line, the 12V filament
circuit has its center tap grounded so the 6v filaments work from each
half of the 12V winding to ground.
If you ground either side of the 12V line to the RCA jack, you short out
half of the 12V...with luck, you blow the filament fuse..no luck and you
smoke something else. If you use the 12V filaments to run a rectifier (
I use a bridge device) DO NOT ground either side of the DC output,
FYI
Curt
KU8L
On 1/8/2012 7:45 PM, Steve Wedge wrote:
I've done all which-ways.
I once used a 120V fan and used a big, honkin' wire-wound resistor to
slow it down.
I currently use a 12V fan with a thermistor over my finals, running
off a 12V wall wart. the fan runs really slow until the temp gets to
the point where the thermistor lets it go for full-speed. This fan
cost me $5 at a hamfest.
I've worked on a couple of R-4B's where the previous owner tapped off
the filament supply with a diode and cap (half-wave rectifier). The
fans he used are a little louder than my Xmitter fan.
If you opt for using on-board power, you can tap off the filament
supply for 12V and feed it to an RCA jack in the SPARE location, or
just feed wires through that hole. I like just setting the fan on
top, using rubber feet. No holes get drilled that way...
YMMV,
Steve Wedge, W1ES/4
Live free or die: Death is not the worst of evils.
John Stark.
All my computers have my signature with various pearls of wisdom
appended thereto.
*From:* Michael & Sue Trussell <mailto:mtruss8...@comcast.net>
*Sent:* Saturday, January 07, 2012 5:33 PM
*To:* drakelist@zerobeat.net <mailto:drakelist@zerobeat.net>
*Subject:* [Drakelist] Need a fan for my T-4XC Transmitter?
I need to replace my old 30 year old 110 volt fan on my transmitter. I
know a few of you have used the twelve 12 volt fans and some have used
the 110 volt version. What I would like to know where I can get power
so I don't have to plug the fan in every time I turn the rig on. I
would like the fan to come on when I turn on the power to the
transmitter, any suggestions?
Thank you in advance
Michael J Trussell KA8ASN
------------------------------------------------------------------------
_______________________________________________
Drakelist mailing list
Drakelist@zerobeat.net
http://mailman.zerobeat.net/mailman/listinfo/drakelist
_______________________________________________
Drakelist mailing list
Drakelist@zerobeat.net
http://mailman.zerobeat.net/mailman/listinfo/drakelist
_______________________________________________
Drakelist mailing list
Drakelist@zerobeat.net
http://mailman.zerobeat.net/mailman/listinfo/drakelist