Author: N4GA – Rob
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New 2x LDMOS Bias Supply Front End PCB
Designed this new little front end PCB this weekend. My primary goals were as follows: Provide a regulated bias supply using a precision regulator to provide more accurate regulation and some ripple rejection, unlike a straight zener. Allow for independent adjustment of each LDMOS bias, with absolutely no interaction, i.e., adjustment to one side…
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Redesigning the Dual 188XR Test Pallet
Here I will attempt to chronicle the tear down and rebuild of my primary test pallet, which is a dual BLF188XR pallet. This was one of my early designs and I have since done many more and this one needs updating. Plus I want to try some more new things on this pallet. I usually…
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TLT Design and Testing
Cold Rainy Saturday here today so I decided to experiment with some TLT designs and ideas. Stripped the TLTs off my old standby pallet, a 2 x BLF188 and went to work. You can design TLTs using the math, but trust me, this only gets you in the ballpark – a starting point if you…
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50dB HF RF Sampler
I’ve been using the LPC1 RF Sampler that came with my LP100A wattmeter to sample RF to my Spectrum Analyzer. This is an extremely high quality sampler. However, I can’t use my wattmeter while using the coupler as a sampler. Thus this project was born to build a high quality “lab grade” RF Sampler. Following the…
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Flex 6300 Output Spectrum
Here’s the spectrum of the FLEX 6300 transceiver at 7.18Mhz, 100W into a dummy load. Looking all the way out to to 35Mhz, so I could capture to the 5th harmonic. Looking out that far did me no good because there are NO harmonics at all! I realize this is a lot easier to accomplish…