Gary, If you look at my QTH on Google maps, you'll see an identical situation. I am about 700 ft away from three parallel 320KV EHV runs that come direct from the Northside Jacksonville JEA plant. Th
I agree with that assessment. Also SWR can, and does, have an effect on CM choke dissipation. A hypothetical situation was recently described by Dean Straw on the Elecraft mail list [see archive fro
Due process can be distilled into: (1) notice; and (2) opportunity to be heard. In the first year of law school, there's six credit-hours of U.S. Constitutional Law and Federal Rules of Civil Proced
Jim, I think you mean servo-balanced *instrumentation* inputs where three single op-amp stages are used? In a good instrumentation design, CMRR stays high regardless of the source Z and common-mode
I use and like both -- and switch between them mostly to try and stay proficient. I've had to force myself into modeling something every so often to keep from falling back on the learning curve after
There are at least three variations of the 83-1SP. I believe the silver pin, silver body version is the one Bob mentioned. Although it has an "Astroplate" shell (as it's stronger than brass/silver) a
Jim, I'm interested in the VNWA's 160m performance in the presence of local broadcast stations. When designing a Marconi "T" for N4NN, we deliberately resonated the antenna to 1400 kHz which called f
For PC-based, any of the W5BIG analyzers sold through Array Solutions are good candidates. If you don't need VHF+ capabilities, the N2PK VNA is excellent. Mine was supplied by M0WWA who builds them
Forgot to mention that a very powerful attribute of the software-based VNAs is that in many instances, accurate Z measurements can be made at the rig end of a coaxial cable and you don't need to know
Jim, The myVNA software for the N2PK does the remote normalization automatically (with loads placed at the point of Z measurement -- and to the best of my knowledge, so does the most recent software
Ian, thanks for the excellent summary. That could be a classic RadCom or QST article on its own! I think it's worth mentioning that operation of PC-based VNA devices is not as intimidating as it may
Another alternative ro RG-142 is RG-400, a premium grade of the same coax. Often, it can be found on NOS reels at prices close to that of RG-142. I've standardized on RG-400 for coaxial baluns and a
Even with a remote coaxial switch, an unswitched shield conductor is brought through the attic. That calls for bulkhead grounding at the attic entrance point. Paul, W9AC _____________________________
"I've been doing research to determine how important feed line length is. I've been reading up on this off and on for the last few weeks." Justin, Sounds like you're off the a great start. There are
Can anyone recommend any tutorials for learning how to read a smith chart and also using the Sim Smith application ? I want to be able to design coax matching stubs and am a total newbie. The smith c
Dave, Another good tool is TLD since it performs most of the same TLW functions, but also shows a Smith Chart representation. By changing load values and line length -- and seeing both numeric and Sm
I'm in the process of finalizing development of a sequential QSK board that can be used for many applications where both RF sensing and precision sequential timing is required. Examples include: cont
Same here. I first read Cebik's 4-part series in QST. But no matter how much "pre reading" I did, it didn't come together until I started with the simple "back yard dipole" example, already loaded wi
For initial learning purposes, I think it's best to leave out the ground dependencies. "I just downloaded EZNEC and am not good with it at all." From that, I gathered he was just starting out with no
Pete, Does your MFJ 259B separate out reactance and provide the sign (complex R+jX rather than only Z magnitude)? I thought some MFJ models only read magnitude of the impedance. If the 259B reads com