Yes, that case of an accelerating current would radiate per the acceleration criteria in 2nd Edition of Kraus. One type of current that would be accelerating is a simple harmonic oscillation. The har
This is also a common wire pulled inside conduit tubing. In the British wiring systems of some years back a similar wire was used atop wood planks for house wiring of ring circuits, (out and back to
The definitive work on baluns are Jerry Sevick's (sk) books. See "Baluns and Ununs". He has many experimental examples, specifications and results. -Stuart Rohre
Insulation left on the wire of an antenna does reduce wire corrosion, protecting it from acid rain, and air. Another advantage in theory, is its capacitance reduces the wire length needed by perhaps
As to wider bandwidth from stranded wire, I would say not likely. Fatter (larger diameter) wire does produce better bandwidth, but solid and stranded in the same gauge are so very close to the same d
teflon insulation on wire has been used for high power beam trap construction. Look in the QST archives. For any plastic chosen, make sure there are no sharp bends that might cause the insulation to
But would not common mode or unbalance currents be lower than transmission mode currents? (This may relate to impedances at point of insertion of a balun.) Stuart Rohre K5KVH
A good way to think of coax is as always made up of 3 conductors: The center conductor, the inside of the shield, (and those two are where the differential current flow happens,) and the outside of t
As to worrying about buried LMR 400, that would best be done before burying. Any coax candidate for your use should state on its data sheet, or catalog page, "non contaminating jacket". Even if it is
Don, check the date codes on semiconductors and caps. Usually of a form YYDD for year and week of the year. Also check for open circuit by pass caps. Or changed values. Most cleared power units will
Usually you need current equalizing resistors to run power supplies in parallel. If that is what you are doing. Otherwise one Astron may have its regulator set differently from the others. Stuart K5K
In using multiple Astron supplies, you should bypass the output of EACH with ceramic disk cap to avoid RF pickup, a known problem of even a single Astron. Something like a 0.01 should work for HF. -S
Jack, There is an inexpensive test set from Elecraft as a kit, that puts out a standard S9 RF signal that can be used to check S meters and your receiver chain. -Stuart Rohre K5KVH
John, First of all something besides the final was bad which caused the new final to fail. The resistor is a good suspect. Do you have a scope? That would be a help in finding out if you need the "fi
Maybe you could hear your driver within a close distance. If the final failed open, but still had capaciance from base to collector, the signal might leak through. Do check or replace the driver alon
John, how old is your 962? You an easily check the bridge rectifiers with power off, and capacitor discharged through a resistor, individually. With a VOM, or DVM on ohms X 100, you should have low r
Well, some of us 56 year hams also saw mf for microfarads as standard on tube schematics. The use of the Greek letters was unknown until around 1968 in contemporary electronics. mf was used overseas