Transcript INTRODUCTION

W2SZ/1
(The MGEF)
70 Watts
Modifying A
1900 MHz
PCS Amplifier
R. L. Frey - WA2AAU
CHEAP !!
On 2304
R. L. Frey – WA2AAU
Eastern VHF/UHF
Conference
April 22, 2006
70 Watts CHEAP !! On 2304 MHz
Eastern VHF Conf. 4/2006
W2SZ/1
(The MGEF)
1900 MHz PCS Amplifier
Lots of Them In Use
Some Now Surplus…
• Wouldn’t It Be Nice If We Could
USE THEM???
• Surprise!! WE CAN!!
R. L. Frey - WA2AAU
70 Watts CHEAP !! On 2304 MHz
Eastern VHF Conf. 4/2006
W2SZ/1
The AML PCS Amplifier
(The MGEF)
R. L. Frey - WA2AAU
70 Watts CHEAP !! On 2304 MHz
Eastern VHF Conf. 4/2006
W2SZ/1
The AML PCS Amplifier
(The MGEF)
R. L. Frey - WA2AAU
70 Watts CHEAP !! On 2304 MHz
Eastern VHF Conf. 4/2006
W2SZ/1
The AML PCS Amplifier
(The MGEF)
R. L. Frey - WA2AAU
70 Watts CHEAP !! On 2304 MHz
Eastern VHF Conf. 4/2006
W2SZ/1The AML PCS Amplifier
(The MGEF) RF Amplifier Base Plate
R. L. Frey - WA2AAU
70 Watts CHEAP !! On 2304 MHz
Eastern VHF Conf. 4/2006
W2SZ/1
(The MGEF)
Anaren
Xinger
Directional
Coupler
1A1305-10
Diode
Attenuator
12.2 dB
12.2 dB
14 dB
MiniCircuits
ERA-6
MiniCircuits
ERA-6
RF MicroDevices
RF2125P
Stage Gain
24 dB
KFF6358A
Bandpass
Filter
Ericsson
PTH 32003
PA
Input
To
MRF19125
SMA
High Power
PA Stage
-10 dB
Sample
17.9 dBm
17.9 dBm
1W
To Power Control
Circuitry
Max. Power Out (P1)
For Each Part
AML PCS Power Amplifier - Driver Stages
Model No. S80PCSA Part No. 1000103P1 Rev. 4
R. L. Frey - WA2AAU
70 Watts CHEAP !! On 2304 MHz
25 W
RLF
2/27/2006
DrvrBlk2.cdd
Eastern VHF Conf. 4/2006
W2SZ/1
(The MGEF)
R. L. Frey - WA2AAU
70 Watts CHEAP !! On 2304 MHz
Eastern VHF Conf. 4/2006
W2SZ/1
(The MGEF)
R. L. Frey - WA2AAU
70 Watts CHEAP !! On 2304 MHz
Eastern VHF Conf. 4/2006
W2SZ/1 MRF19125
(The MGEF)
R. L. Frey - WA2AAU
Transistor
70 Watts CHEAP !! On 2304 MHz
Eastern VHF Conf. 4/2006
W2SZ/1 MRF19125
(The MGEF)
R. L. Frey - WA2AAU
Transistor
70 Watts CHEAP !! On 2304 MHz
Eastern VHF Conf. 4/2006
W2SZ/1 MRF19125
(The MGEF)
R. L. Frey - WA2AAU
Transistor
70 Watts CHEAP !! On 2304 MHz
Eastern VHF Conf. 4/2006
W2SZ/1 Ericsson
(The MGEF)
PTH32003
It’s A
DUD!
R. L. Frey - WA2AAU
70 Watts CHEAP !! On 2304 MHz
Eastern VHF Conf. 4/2006
W2SZ/1 Ericsson
(The MGEF)
R. L. Frey - WA2AAU
PTH 32003
70 Watts CHEAP !! On 2304 MHz
Eastern VHF Conf. 4/2006
W2SZ/1
(The MGEF)
Ericsson PTH 32003
• Lots of internal matching stuff
• Not likely it can be made to work
by matching it externally
• Sadly, this part won’t work for us
• We could have used a driver!!
R. L. Frey - WA2AAU
70 Watts CHEAP !! On 2304 MHz
Eastern VHF Conf. 4/2006
W2SZ/1
(The MGEF)
AML Amplifier Mounted to Heat Sink with Fans for Testing
R. L. Frey - WA2AAU
70 Watts CHEAP !! On 2304 MHz
Eastern VHF Conf. 4/2006
W2SZ/1
(The MGEF)
R. L. Frey - WA2AAU
70 Watts CHEAP !! On 2304 MHz
Eastern VHF Conf. 4/2006
W2SZ/1
(The MGEF)
R. L. Frey - WA2AAU
70 Watts CHEAP !! On 2304 MHz
Eastern VHF Conf. 4/2006
W2SZ/1
(The MGEF)
R. L. Frey - WA2AAU
70 Watts CHEAP !! On 2304 MHz
Eastern VHF Conf. 4/2006
W2SZ/1 AML Amp Operating on Original Frequency of 1975 MHz
(The MGEF)
12.0
100
10.0
Power Out
Efficiency
Gain
80
8.0
60
6.0
40
4.0
20
2.0
0
Gain (dB)
Output Power (Watts) & Efficiency (%)
120
0.0
0
1
2
3
4
5
6
7
Drive Power (Watts)
R. L. Frey - WA2AAU
70 Watts CHEAP !! On 2304 MHz
8
9
10
R. L. Frey
4/24/2005
Eastern VHF Conf. 4/2006
W2SZ/1
(The MGEF)
Copper Coaxial Cable Connections To Test Single Transistor
R. L. Frey - WA2AAU
70 Watts CHEAP !! On 2304 MHz
Eastern VHF Conf. 4/2006
W2SZ/1
(The MGEF)
Output Power (Watts) & Efficiency (%)
120
13.0
12.0
100
11.0
Power Out
Efficiency
10.0
Gain
80
9.0
8.0
60
7.0
6.0
40
5.0
4.0
20
3.0
2.0
0
1.0
0
1
2
3
4
5
6
7
8
Drive Power (Watts)
9
10
R. L. Frey
4/26/2005
Top Transistor of AML Amplifier Operating
on Original Frequency of 1975 MHz
R. L. Frey - WA2AAU
70 Watts CHEAP !! On 2304 MHz
Eastern VHF Conf. 4/2006
Gain (dB)
14.0
W2SZ/1
(The MGEF)
AML Amplifier Performance
at Original Freq. (1 Transistor)
•
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•
•
•
•
R. L. Frey - WA2AAU
Power Output = 100 Watts
Drive Power = 6.61 Watts
Power Gain = 12.0 dB
Input Return Loss = 6.9 dB pew!
Power Supply = 26.3 Volts
Current Draw = 8.5 Amps
Efficiency = 44.7% …
70 Watts CHEAP !! On 2304 MHz
Eastern VHF Conf. 4/2006
W2SZ/1
(The MGEF)
Original Input and Output Matching of Power Transistor
R. L. Frey - WA2AAU
70 Watts CHEAP !! On 2304 MHz
Eastern VHF Conf. 4/2006
Microstrip Matching Network
W2SZ/1Input
(Second Pad Back From Power Transistor)
R. L. Frey
3/1/2006
(The
MGEF)
0.20
0.11
0.20
Bridge Gaps With
Copper Foil
0.5
0.64
0.36
Add Two Patches
Of Copper Foil
Original Design
All Dimensions are in Inches
R. L. Frey - WA2AAU
Modified for 2304 MHz
70 Watts CHEAP !! On 2304 MHz
Eastern VHF Conf. 4/2006
W2SZ/1
(The MGEF)
R. L. Frey - WA2AAU
Input Match Modified For 2304 MHz
70 Watts CHEAP !! On 2304 MHz
Eastern VHF Conf. 4/2006
0.737”
W2SZ/1
(The MGEF)
0.555”
0.477”
0.063”
0.220”
Edge Of Transistor Body
0.160”
0.035”
0.600”
0.035”
0.035”
Original Output Matching Circuit
0.025”
Etc
Etc
0.25”
R. L. Frey - WA2AAU
0.25”
Tuning Strips
Not Connected
70 Watts CHEAP !! On 2304 MHz
R. L. Frey
3/1/2006
Eastern VHF Conf. 4/2006
W2SZ/1
(The MGEF)
0.730”
0.555”
R. L. Frey
3/1/2006
0.340”
0.100”
Edge of Transistor Case
0.200”
0.080”
0.035”
0.600”
0.160”
0.050”
0.25”
0.18”
Foil
Tape
0.20” Soldered
In
Place
0.035”
Tunable Foil Flappers
Bend Up & Down
For Best Power Output
Etc
0.035”
0.10”
0.025”
0.25”
R. L. Frey - WA2AAU
Etc
Output Matching Circuit
Modified for 2304 MHz
0.25”
70 Watts CHEAP !! On 2304 MHz
Eastern VHF Conf. 4/2006
Photo of Output Matching Circuit Modified for 2304 MHz
W2SZ/1
(The MGEF)
R. L. Frey - WA2AAU
70 Watts CHEAP !! On 2304 MHz
Eastern VHF Conf. 4/2006
14.0
120
13.0
Output Power (Watts) & Efficiency (%)
12.0
100
Gain (dB)
W2SZ/1 Top Transistor of AML Amplifier Retuned to 2304 MHz
(The MGEF)
11.0
Power Out
Efficiency
10.0
Gain
80
9.0
8.0
60
7.0
6.0
40
5.0
4.0
20
3.0
VDD= 26.3 Volts
0
2.0
1.0
0
1
2
3
4
5
Drive Power (Watts)
R. L. Frey - WA2AAU
70 Watts CHEAP !! On 2304 MHz
6
7
R. L. Frey
5/8/2005
Eastern VHF Conf. 4/2006
W2SZ/1
(The MGEF)
R. L. Frey - WA2AAU
Performance at 2304 MHz
•
•
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•
•
•
Power Output = 79 Watts
Drive Power = 6.2 Watts
Power Gain = 11.3 dB
Input Return Loss = 21.4 dB
Power Supply = 26.3 Volts
Current Draw = 9.4 Amps
Efficiency = 32% … - Not Great
But We Do Have 79 Watts!
70 Watts CHEAP !! On 2304 MHz
Eastern VHF Conf. 4/2006
W2SZ/1 Top Transistor of AML Amplifier Retuned to 2304 MHz
(The MGEF)
50
12.0
VDD= 13.8 VDC
IDQ = 1.35 A
11.0
Output Power (Watts) & Efficiency (%)
10.0
9.0
30
Gain (dB)
40
8.0
7.0
20
6.0
Power Out
Efficiency
5.0
Gain
10
4.0
3.0
0
2.0
0
1
2
3
4
5
Drive Power (Watts)
R. L. Frey - WA2AAU
70 Watts CHEAP !! On 2304 MHz
6
7
8
R. L. Frey
5/8/2005
Eastern VHF Conf. 4/2006
W2SZ/1
(The MGEF)
R. L. Frey - WA2AAU
Performance at 2304 MHz
With VDD = 13.8 Volts DC
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Power Output = 20 Watts
Drive Power = 1.62 Watts
Power Gain = 11.1 dB
Input Return Loss = 19.7 dB
Power Supply = 13.8 Volts
Current Draw = 5.4 Amps
Efficiency = 27% … - Poor, But
We Do Have 20-30 W. at 13.8 V
And it is a 26-Volt Transistor!!
70 Watts CHEAP !! On 2304 MHz
Eastern VHF Conf. 4/2006
W2SZ/1
(The MGEF)
Stage Gain
11.5 dB
Anaren
Xinger
Directional
Coupler
1A1305-10
0.3 mW
Input
11.5 dB
10 dB
11.7 dB
10.6 dB
Motorola
MRF19125
MiniCircuits
ERA-6
MiniCircuits
ERA-6
RF MicroDevices
RF2125P
Motorola
MRF19125
10V Reg
10V Reg
10V Reg
13.6 VDC
(5.2V DC)
(5.2V DC)
(6V DC)
26 VDC
Anaren
Xinger
Directional
Coupler
1A1305-30
75 W
SMA
-5 dBm
-6 dBm
5.5 dBm
17dBm
27 dBm
(1/2 W)
Bias
5V Reg
7W
80 W
AML PCS Power Am plifier On 2304 MHz
Model No. S80PCSA Part No. 1000103P1 Rev. 4
R. L. Frey - WA2AAU
Type
N
Bias
5V Reg
-10 dB
Sample
70 Watts CHEAP !! On 2304 MHz
RF
OUT
-30 dB
Sample
RLF
3/2/2006
HiGain1.c dd
Eastern VHF Conf. 4/2006
W2SZ/1
(The MGEF)
Predicted Performance of the
Suggested Cascade of Stages
•
•
•
•
R. L. Frey - WA2AAU
Power Output = 70-80 Watts
Drive Power ~~ 0.3 Milliwatts
Power Gain > 50 dB watch out
Power Supply = 26.3 V @ 9.4 A
And 13.8 V at about 5 amps
70 Watts CHEAP !! On 2304 MHz
Eastern VHF Conf. 4/2006
W2SZ/1
(The MGEF)
Conclusions
•
•
•
•
•
Very Useful Building Block
Requires Some Work to Use It
Efficiency Only Fair, but Typical
Absolutely Needs Big Heatsink!!
Will Deliver 25-30 W at 13.8 V
• Low Level Driver Design Still Needed
• My First Try on 1296 MHz 
Did NOT Work
R. L. Frey - WA2AAU
70 Watts CHEAP !! On 2304 MHz
Eastern VHF Conf. 4/2006
W2SZ/1
(The MGEF)
More Information At:
• Detailed information in living
color is available at:
http://www.mgef.org/amps/index.html
And
http://www.wa1hco.net/PCS_index.html
• To Obtain an Amplifier Contact
R. L Frey – WA2AAU at E-mail:
[email protected]
R. L. Frey - WA2AAU
70 Watts CHEAP !! On 2304 MHz
Eastern VHF Conf. 4/2006