Rf Driver

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Rf Driver

Postby W2INR » Sat Jun 26, 2004 9:50 pm

The E rig is coming along. Power supplies and modulator are assembled and I have just started the Rf deck. These are some pics of the RF driver module for the E Rig.

These photos were taken just after a rough bolt up.

http://www.amfone.net/eamp.jpg

http://www.amfone.net/edrvinput.jpg
G

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Postby ke1gf » Sun Jun 27, 2004 9:15 am

G, looks great!

You will have to adjust the big coil (compress/expand) in that picture to get a pseduo class-E wave on the drains of the driver fets.

-Bill 'GF
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Postby K1JJ » Sun Jun 27, 2004 7:27 pm

Nice start to the project, G!!

You will have the third version in the world - of this specific
configuration when finished.

Bill #1, mine #2, yours #3... :wink:

Good luck -

Tom, K1JJ
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nice sink

Postby N9NEO » Sun Jun 27, 2004 9:17 pm

Don't think I've seen that sink before. Should do very nice job. Can you supply dimensions? I am curious and would like to simulate it's performance. If you are interested I can give you a table of watts -vs- temp. and you will then know how many watts you are dumping in to it. It looks like might take you a while to get it up to temperature.

73
Bob
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Postby frank carcia » Mon Jun 28, 2004 7:07 pm

I guess my configuration doesn't count
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Postby K1JJ » Mon Jun 28, 2004 7:32 pm

frank carcia wrote:I guess my configuration doesn't
count


Nope. Yours is too high tech, Frank... :wink:

Just depends upon how closely you compare all the rigs. Gary's
and mine are almost exact electrical duplicates of Bill/GF's design
from finals, drivers, PDM generator, PDM modulator and filter...
But we'll let ya join the club if ya want, caw mawn.


T
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Postby frank carcia » Mon Jun 28, 2004 7:46 pm

Too high tech? I can't agree. K.I.S.S. yes.
TNX for letting me hang with you guys. Now I have to package the moddulator.....Maybe in the fall. Short term goal is to blast Hendrix
at Woodstock on July 4 at noon from new QTH.
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Postby frank carcia » Mon Jun 28, 2004 7:54 pm

Hey Gary,
Looks nice and neat. Keep up the good work! Remember short leads keep the leakage inductance monster away. I just gained a couple percent by removing a turn from my secondary. I had a 4 turn secondary
when I started and was close to 80% efficiency. With 2 turns and a litle more C in the load cap and it is 87%. Coil still hot so there is more efficiency hiding in my tank at 1 KW out. QRP over 90%.
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Postby K1JJ » Mon Jun 28, 2004 8:21 pm

frank carcia wrote:Too high tech? I can't
agree.


Hey, lighten up Frances... I'm being facetious. :lol:

As we talked privately, when you finally document that
thing I may tear mine down, make it bigger and duplicate
what you've done to get rid of all these transformers and
extra wires.

OK, yours is too simple... :wink:

T
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Postby frank carcia » Tue Jun 29, 2004 11:07 am

I know, just playing Sgt. Anderson with you.
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Postby W2INR » Tue Jun 29, 2004 5:02 pm

Hi Bob and thanks for the replies.



I have the dimensions here for the heat sink

It is 4.5 x 6 inches . The fins are 3" and the base is 5/8's thick.

When mounted in the chassis there will be holes cut in the base plate to allow air flow. The tunnel effect should also help the cooling a little better.

If needed a small fan could be used under the chassis. Maybe a thermostatically control fan that could be set to operate at a particular temp.

TNX
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ok on dimensions

Postby N9NEO » Tue Jun 29, 2004 7:04 pm

Smoking nice rig. I will try to get some thermal information soon. If not Thursday then later next week.

NEO-later
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Postby N9NEO » Thu Jul 01, 2004 5:12 pm

Gary,

Here is chart of Pd -vs- Delta_t. Heatsink more efficient - Rtheta will be lower as part gets hotter. Below is file out of last run at 200w. Check dimensions that I got it right. You can measure temp between a pair of mosfets in center to get closest. I realize I used anodize and I think your sink is not. This is ok and should actually get you closer. Sauna has a tendency to be a little pessemistic. Have you any idea what sink was designed for?

Have you any predictions of efficiency of your particular configuration? I understand that configuration is very rare. Only a few are known to exist.

Good luck with rig. Class E lots of fun.

NEO-later

Watts Delta_t (in degrees C)



20 15.6
40 27
60 37.3
80 47
100 56.2
120 65.03
140 73.6
160 81.8
180 89.87
200 97.71

SAUNA INFO REPORT
-----------------

Date and time : 1-Jul-4 17:24
Model file : INR.smf
Calc type : Steady state
Sauna version : V3.20
Air pressure : One atmosphere
Units : Degrees C, mm, watts
Comments : None

ASSEMBLY INFORMATION

PLATE 1

-- Basic Geometry --
Assembly type : Plate with fins
Orientation : XY plane
Origin point : (0, 0, 0)
Wide x high x thick : 114.00 x 152.00 x 16.00
Volume : 6.876E+5
Component side : Positive direction (front)
Edge area option : 50% assigned to each side
X node spacing : 11.40
Y node spacing : 10.86
In superassembly : No

-- Material Properties --
Material type : Alum Extrusion Alloy, 6063 T5
Thermal conductivity : 2.091E-1
Density : 2.700E-6
Specific heat : 942.00
Mass : 1.86 (4.09 lbm)
Capacitance : 1748.96

-- Component Side Properties --
Surface type : Aluminum, Anodized
Emissivity : 0.81

-- Secondary Side Properties --
Surface type : Aluminum, Anodized
Emissivity : 0.81
Fin orientation : Vertical
Fin length : 75.00
Centerline spacing : 13.00
Fin thickness : 4.00
Number of fins : 9.00
End fin type : Both open
Nodes in fins : No

-- Component Side Dissipation --
Usable face area : 1.733E+4
Conv/radiation area : 1.733E+4 (100.00% of usable)
Usable edge area : 4256.00



- 1 -


Conv/radiation area : 4256.00 (100.00% of usable)
Conv/radiation type : Isolated plate/board to ambient
Convection mode : Natural convection
Flow length type : Take from assembly/superassy
Flow length : 152.00
h vs. length : Use average h
Conv/radtn ambient : Room Amb (fixed, prompted T)

-- Secondary Side Dissipation --
Usable face area : 1.733E+4
Conv/radiation area : 1.733E+4 (100.00% of usable)
Usable edge area : 4256.00
Conv/radiation area : 4256.00 (100.00% of usable)
Conv/radiation type : Isolated plate/board to ambient
Convection mode : Natural convection
Flow length type : Take from assembly/superassy
Flow length : 152.00
h vs. length : Use average h
Conv/radtn ambient : Room Amb (fixed, prompted T)

-- Edge Joins --
None

-- Stack Joins --
None

-- Edge Nodes --
None


HEAT INPUT INFORMATION

-- Point Source Properties --
None

-- Plate/Board Distributed Wattages --
Assembly Wattage Uniform
Plate 1 200.00 No

-- Wattage Totals --
Point sources : 0.00
Distributed : 200.00
Point + distributed : 200.00

-- Footprint Source Thermal Properties --
None


TEMPERATURE INFORMATION

-- Fixed Node Temperatures --
Label Temp
Room Amb 0.00




- 2 -


-- Point Source Temperatures --
None

-- Plate/Board Node Temperatures --
Min Max Aver
Assembly Temp Temp Temp
Plate 1 87.84 97.71 91.19

-- Float Resistor Parameters --
Maximum float resistor error : 0.12%
Number of iterations : 1



- 3 -
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Postby W2INR » Fri Jul 02, 2004 4:23 pm

Thanks Bob

Looks like I am okay.
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