hard rock: a modular approach to experimental radioweb.cecs.pdx.edu/~campbell/hardrocktalk.pdfthe...
TRANSCRIPT
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Hard Rock:A Modular Approach to
Experimental Radio
Rick CampbellKK7B
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Portland State University
Electronic Component Vending Machine run by IEEE Student Store
http://web.cecs.pdx.edu/~campbell/
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Hardware Defined RadioClassic Rock
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Garage Bands and Covers
Soft Rock
Easy Listening
Cover -- Take someone else’smaterial and reproduce it
GDR
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Original Material
Experiment
Learn the Rules
...and then Break Them
Or you can do....
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Rick Hulett
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The Hard Rock Approach
Focus on each module independently
Test each module independently
Analog Inputs and Outputs
Swap modules to modify the sound
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Hard Rock Experimental Radio
Hard Rock Block Diagram
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The Modules:
The Antenna is the first stage of the receiver. Design the rest accordingly
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Receive Antenna Coupler
Put the Volume Control where it does some good
Dynamic Range
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Receive Antenna Coupler
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Front-End Crystal Filter
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Low DC Power 40m ReceiverRick Campbell 15 Mar 2009
H1 7 MHz 50 ohm quadrature hybrid: 18 turns bifilar on T37-2 (1.1 uH) and two 220 pF capacitors. L1 and L2 12 turns FT37-43. T1 8 turns trifilar on FT37-43. JFET Hartley VFO component values determined experimentally: see many examples in EMRFD. Gain from antenna input to 50 ohm head-phone output is 50 dB: use good antenna and sensitive headphones
This receiver was designed and built as an exercise in sustainable radio engineering: minimum DC power requirements with fundamental concepts, components and techniques that have been around for 50 years and will still be useful for another 50. Performance falls in the wide gap between minimalist designs and good basic receivers such as the microR2. The major performance compromises to achieve ultra-low DC power with common components are opposite sideband suppression, gain, and 2nd and 3rd order dynamic range. Gain and dynamic range limitations may be addressed by using a full-sized elevated dipole antenna fed with ladder line and a high Q impedance matching network such as a Johnson Matchbox. Suppression of an interfering signal or carrier on the opposite sideband may be achieved by adjusting the input Pi network and IQ balance pot to null the offending signal. Experiments are in progress to reduce the power consumption of the Local Oscillator.
L3
730pF
51
2uH
C1 2.7
J310
1N4148100n
1002.2k
33mH
12k
3.9k
680p
2N3904
2N3904
3
1
2
7
5
6
1.8k27k
27k
3.3k430p
768k
487k
+
+
33u
33u
1u680n
3.9mH
100u+
22k
10k
22n
2N3906
2N3906
12k
3.9k
680p
2N3904
2N3904
1.8k27k
27k
3.3k430p
196k
124k
+
+
33u
33u
1u680n
3.9mH
22k
10k
22n
2N3906
2N3906
2Q4
+100u
1k8
10 390
270
4.5v
4v
220k
220k
33u
+ 1.5uF
T1
10nF
51
730pF10nF
T2
H1
L1
L2
1N4148
1M
C2
9v 4 mA
IQ Diode Detector
Local Oscillator
B&W
4v 2.5 mA
10k
With a good antenna and receive coupler, the rest of the system may be Primitive and Simple
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But sometimes we want something better
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Image-Reject Downconverter
iR2 Instrumentation Receiver
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RF Signal Path Block Diagram
RF LO
0
0
0
90
I
Q
Top half of the circuit board. Note all the gain and RF selectivity. This is a different approach to receiver design that works well on a selected
narrow band between 50 kHz to 250 MHz
This is not the way to build a receiver that covers every amateur band from 160 to 6m!
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2 dB Noise FigureSerious selectivity before the IQ mixers
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Analog Signal Processor
Analog Signal Processing Block Diagram
I All-Pass
Q All-Pass
baseband out
Conventional. A few changes related to increased gain ahead of mixers.
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Can be built for wide baseband
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ADE-1 Diode Ring Mixer
No Mystery Parts! Study the schematicsand see how everything works.
Photo inside the Diode Ring Mixer.Two transformers, 4 diodes.
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Some surface mount on back side of board where they improve performance
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Complete 50.125 SSB-CW Receiver
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Complete 50.125 SSB-CW Receiver
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Easy to reconfigure modulesto try different combinations
Sometimes fixed station, sometimes portable, sometimes battery operated on boat
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Hard Rock need Valves!
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Note: 200 hour battery life of Zenith Transoceanic in 1949
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Experiments
One Hardware Module at a Time
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Working Experimental System
(One Hardware Module at a Time)
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Measure them at the bench
One Hardware Module at a Time
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Then Assemble Modules
40m AM Stereo Receiver
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You can go deep into system and break it up into modules.
For PA experiments, you can even treat the PA transistor as a module
Experimental goal is to isolate the variables so you can focus on one at a time
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Experimental 6 watt 50 MHz Linear PA
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Telemetry
Other Applications
Balloons and Rockets
Remotely Operated Vehicles
(Amateur Radio is more than just a bunch of retired Rocket Scientists
touching base every morning)
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Students with Sonobouy
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Marine Surface Sound Microphone
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Modular approach encouragesexperiments
Conclusion:
Hard Rock approach encourages whimsy and fun
Whatever you do...pass it along to the next generation
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Thank You