for ac voltage

for ac voltage

Antennas : Magnetic Loop

• Home made High Power Magnetic Loop Antennas - Magnetic Loop Antennas for The Radio Operator with Limited Space, a two part series of articles on how to construct a magnetic loop antenna, including directions on selecting high voltage tuning capacitor
  [ Hits: 896 | Votes: 0 | Rating: 0 ]

• Matching Waves, VSWR at work - When the radiation resistance (voltage to current ratio) of an antenna is the same value as the characteristic impedance of the transmission line (voltage to current ratio in the line), all of the electrical energy transmitted down the line is taken by the antenna and radiated into space in the form of a radio wave.
  [ Hits: 507 | Votes: 0 | Rating: 0 ]

• JustRadios, Capacitors for Antique Radios - "Sells high voltage film and electrolytic capacitors for antique tube radios. Carries 630 volt metal-film, metallized and mylar film capacitors as well as electrolytics. Also has ""capacitor"" tips for antique radio restorations."
  [ Hits: 5628 | Votes: 16 | Rating: 8.12 ]

• Eurofrequence - Accessories, like universal audiofilter, Mixer interface for sound card, highvoltage powersupply, accessories for 706, hamradio vacation,Roger Beep, Microphons, Headsets and more. Please look
  [ Hits: 2977 | Votes: 13 | Rating: 7.8 ]

• Kings Electronics - Manufacture a wide array of RF interconnect products for operation from 0 to 18 GHz, ranging in size from subminiature connectors to large, high voltage types
  [ Hits: 490 | Votes: 2 | Rating: 5.5 ]

• GIGAVAC Ham Radio Relays - Gigavac is a leading designer, manufacturer, and worldwide seller of contactors and high voltage relays using vacuum, gas filled, and high voltage reed relay technology. hv relay applications information with cross reference charts for kilovac / tyco, jennings, and crydom part numbers.
  [ Hits: 569 | Votes: 3 | Rating: 4 ]

• Watts Unlimited - Engineering Solutions for Unique Problems. Manufacturer of high Voltage, high Current, high Power Power Supply
  [ Hits: 1689 | Votes: 3 | Rating: 7 ]

• Antennas for QRP Operation - Antennas for low-power operation resemble those for 100W use. Minor adjustments, like capacitor voltage ratings, may apply, but basic principles persist. Portable antennas, notably Backpack Antennas for weight-conscious setups, hold relevance beyond QRP. While some antennas function acceptably at higher power, efficiency issues arise at QRP levels. Testing antennas at 100W exposes weaknesses, particularly in tuners, crucial for efficient QRP operation.
  [ Hits: 88 | Votes: 0 | Rating: 0 ]

• SB-220 Repairs and Modifications - Heathkit SB 220 mods, replacing the Zener ZD1, replacing the plate-voltage voltage divider, adding a keying circuit for solid state transceivers
  [ Hits: 912 | Votes: 1 | Rating: 10 ]

• Icom 706MK2G Repair - After years of reliable performance, a 26-year-old Icom 706MK2G exhibited an unusual deviation during FM transmission, with the actual frequency being 10kHz off from the displayed frequency. Additionally, the power meter showed a sharp dip during transmission. Upon investigation, it was discovered that the FM VCO voltage adjust variable had become dirty and sluggish over time. By adjusting the variable capacitor and cleaning it with switch cleaner, the issue was resolved, restoring stable power output and accurate frequency transmission.
  [ Hits: 18 | Votes: 0 | Rating: 0 ]

• FT CALC 1.3 - Ferrite Toroidal Core HF Calculator - This EXCEL Program Worksheet calculates the safe operating conditons for a toroidal transformer operating between 1 and 50 MHz. Manufacturer data for complex permeability, magnetic dimensions, and saturation flux density must be available. Some core types which are commonly used in amateur transmission are included. The program produces limiting winding voltages for linear operation and temperature rise over the range of frequencies and power specified.
  [ Hits: 283 | Votes: 1 | Rating: 2 ]

• IC-7300 Arduino Based Antenna Switch - An Arduino Based Antenna Switch For The IC-7300 that monitors the band voltage from the rear accessory socket on the IC-7300. Two RF antenna relays are used to switch to the appropriate output.
  [ Hits: 124 | Votes: 0 | Rating: 0 ]

• Repair or Replace Electrolytic Capacitors - For low voltage applications, like cathode bypass capacitors, most vintage types have an axial configuration, which is less common today but still available. Electrolytic power supply caps likely constitute the single worst liability in old audio, radio and test equipment. Rap about Electrolytics, Reforming, Chassis-Mount Replacements, Under-Chassis Installation, Rebuilding Capacitors
  [ Hits: 121 | Votes: 1 | Rating: 6 ]

• 5400 W Dummy Load - High Voltage Dummy Load 3000 OHMS, 5400 WATTS There are 45 layers of 6 resistors, each one being 400 OHMS @ 20 Watts for a total of 270 resistors
  [ Hits: 1370 | Votes: 6 | Rating: 8.17 ]

• Voltage protector/Fuse Assembly for 100-watt transceivers - A compact voltage protector/fuse assembly for 100-watt transceivers by AD5X
  [ Hits: 1388 | Votes: 1 | Rating: 10 ]

• PL259 Surge Arrestor - A sourge arrestor for PL 259 connectors. A voltage surge arrestor to limit the voltage that may come back down the wire or coax after there has been static build up
  [ Hits: 1431 | Votes: 1 | Rating: 10 ]

• HV power supplies - WV0NNI 2,800 VDC @ 2 Amps Continuous Variac adjusts filament voltage. A voltage doubler circuit, well suited for smaller, compact linear amplifiers.
  [ Hits: 1402 | Votes: 1 | Rating: 5 ]

• High Voltage Breakdown Tester - K8CU technical topics article about high voltage breakdown tester necessary for testing of any high voltage components like vacuum tubes, high voltage capacitors, vacuum relay
  [ Hits: 537 | Votes: 4 | Rating: 7.75 ]

• Microwave Transverters Projects - A collection of some electronics hobby projects by KC6QHP that includes microwave transverters for several radio frequencies such as 79 GHz, 47 GHz 24 GHz and 10 GHz. All projects includes detailed pictures of components, like voltage regulator boards, RF Decks, sequencer and protector board and receiver details.
  [ Hits: 158 | Votes: 0 | Rating: 0 ]