Blog tag line
The tag line sums up my fascination with radio. What the heck is the stuff that makes radio anyway? It’s actually a derived quip from the famous physicist Roy Glauber who once jokingly summarized his...
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Boonton 4220 Power Meter
For a long time I’ve wanted a decent power meter to calibrate my equipment. I’m finally getting a collection of equipment worthy of calibration and decided to spring for a meter. She’s a beaut!...
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AD8307 Analog Output conversion
John-NG0R and I are working on a digital power meter based roughly on the AD8307 log amplifier from Analog Devices. We want to use a common panel meter to do the indication. But the scaling of the log...
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As in all instruments, the notion of complexity, cost, and usability are important trade-offs. On the one hand, a meter with the ability to sense absolute power is important. If that was the only...
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4 Simple Directional Couplers
I’ve got 4 different SWR bridges in the shack and in the junque box. Out of curiosity I thought it might be helpful to investigate the various methods of building a directional coupler. Upper left...
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Directional Coupler Vers 0.1
My first attempt to make a directional coupler turned out OK but not brilliant. The goal was to be able to sample forward and reflected power using a simple stand-alone box. I think I can call this a...
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Class A, AB, C ramblings
I have been pondering the ability for simple parts to gather useful gain at HF. Tonight I built a simple Push Pull arrangement using a pair of 2N7000 FETs. It’s pretty simple. It’s breadboarded so...
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Wavetek 2510A Problems
By Ford-N0FP The Wavetek 2510A is a 0.1MHz to 1100MHz signal generator with a calibrated output. I’ve tested it against the Boonton Power Meter and found it to be pretty accurate. Wavetek 2510A The...
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80M (all-band) NVIS (N.ear V.ertical I.ncidence S.kywave) Antenna
November 3, 2012 By Ford-NØFP 4 tower, 28′ high, 284′ long loop 4 supports, 72’ apart, 28’ high, 284’ of wire. Looking west. Design Concept: More than one antenna is an operating feature. When the...
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Wide Band Bipolar RF Amplifier
By Ford-NØFP Many RF projects require modest amplification in various spots. Picking the right active stages, the right circuit topology, the right collection of components, seems to be more like an...
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