![]() ![]() Single surface multipaction discharge can also occur on dielectric component surfaces, if there is a bias DC field, electric or magnetic, and a high frequency electric field is present parallel to the dielectric surface. Additionally, in some high power tubes, multipactor can emit visible light and X-rays. In the case of a high mode (N mode) multipactor, several electron cloud sheets (exactly 2N-1) will oscillate between the surfaces under steady state conditions. 1 The discharge will heat the surfaces of the electrodes, increase signal noise, block the electric field and appear as a brief electron current between the two electrodes. Multipactor creates a sheet like cloud of electrons, which are oscillating between the two electrode surfaces. Over time, in most space and vacuum applications, the term has come to define the harmonic electron breakdown. 1 However, Farnsworth first derived the name multipactor from “AC Electron Multiplier,” 2 originally describing hardware rather than the mode of the electron emission itself. ![]() This tube was later superseded by Zworykin’s Iconoscope. ![]() In the 1930s, American Philo Farnsworth designed an amplifier vacuum tube for television signal transmission, based on the multipactor. The multipaction discharge phenomenon is not always undesirable. Second, the secondary electron emission coefficient of the impact surface must exceed unity. First, the one way transit time between the two electrodes is an odd number of half cycles N, where N is an odd positive integer (N = 1, 3, 5 …). There are two main conditions that must be present for multipactor. This electron charge build up can cause a resonance type of breakdown in the form of a multipaction discharge.1 Multipaction discharge itself can also cause an additional saturation mechanism through its interaction with the electrodes. Under the appropriate conditions, the number of electrons will increase exponentially up to a saturation point, at which the electron density is large enough to block the electric field. The synchronization between the secondary electron emissions and the frequency of the electric field alternating polarity will accelerate the electrons back to the source electrode (see Figure 1). These collisions create a secondary electron emission from the electrode structure. This change in the distance relationship allows free electrons to impact the electrode surface. In a vacuum environment, the electron free path distance is greater than the electrode separation distance. 1 The electric component of the electromagnetic field can have sufficient energy to cause the emission of electrons from the material surface. Multipactor is a resonance type of discharge that can occur under vacuum conditions. Interconnection of these interfaces is often found in applications involving the transmission of audio or video signals.The development of coaxial microwave components capable of handling high peak power without the presence of multipactor is an important part of component design for space and vacuum environments. Mounting: Bulkhead/Chassis 3/8" Hole (0.375" /9.54mm).ĭimensions: Overall Length 1.00" (25.4mm)ĭifficult to find interface combination to solve your interconnection problemsĪlternates: VAD20X, 7521280M, RJ-R, 72J77JBS7, BA887, ArticĪpplications: Supports a wide array of devices that are RCA/Coax compliant, these devices include but are not limited to Digital HDTVs, CATVs, Samsung Smart TVs, monitors, radios, antennas, GPS systems, VCRs, DVR and DVD players, amplifiers, av receivers, splitters, surveillance/security systems, transmitters, digital satellites, and much more. ![]() Material: Tarnish Resistant Nickel Plated Brass It also provides resistance to corrosion. Nickel-plated contacts that minimize signal loss as well as stabilizing signal transmission. This nickel-plated coaxial adapter has an F-type female bulkhead connector opposite an RCA female connector. Unidentified MFG - F to RCA Adapter - F-Type Female Bulkhead to RCA Female.Ĭoax adapters are the perfect way to quickly change the gender or connector type on an already terminated cable. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |