The ARRL Antenna Book: The Ultimate Reference for Amateur Radio Antennas, Transmission Lines And Propagation (Arrl Antenna Book)
- 976 Pages - 05/01/2007 (Publication Date) - Amer Radio Relay League (Publisher).
Top Radio Frequency Relay Reviews
MUSYSIC Professional 2 Channel 7000 Watts DJ PA Power Amplifier Signal out MU-P7K
- Stereo Output Power: "2x4000W PEAK, 2x2000W Program, 2x1000W RMS @2Ω" "2x2000W PEAK, 2x1000W Program, 2x500W RMS @4Ω" "2x1000W PEAK, 2x500W Program, 2x250W RMS @8Ω".
- Bridge Output Power: "4000W PEAK, 2000W Program, 1000W RMS @4Ω" "2000W PEAK, 1000W Program, 500W RMS @8Ω".
- Frequency Response: 20Hz-20KHz,+0,-1dB at watts / THD+N(20Hz-20KHz) : ＜0.23％20Hz-20KHz / Siew Rate ＞30V/us / Damping Factor ＞150 / Output Circuitry: Class AB / Signai to Noise Ratio ≥96dB / Cross Talk ＞80dB / lnput Sensitivity(8Ω) 1V /.
- Connectors: Input: XLR input, 1/4" input: XLR Output: Speakon connector Output: Speakon, locking type socket, Banana plug connection output.
- Dual cooling fans / Controls Panel: the power switch, channel 1 and channel 2 channel gain control.
- After the board: working mode, pressure limit. / lndicators Panel: the power switch, channel 1 and channel 2 channel gain control.
- After the board: working mode, pressure limit. / Amplifier Protection With short circuit, overload, overheat, cut peak pressure limit, dc, soft start, relay zero current switch, super audio and radio frequency protection device..
Tecsun Radio PL-380 DSP Fm Am Stereo World Band Receiver,Small Size Radio
- It receives FM stereo, AM, long wave, short wave (2.3 - 21.95MHz) radio program, practical multi-function, easy to operate..
- FM receiver wide frequency range (64 - 108MHz), containing part of the campus radio and 2 - 5 channel TV Sound programs.
- 7 kinds of method of selection sets: easy tuning (ETM), manually search for radio frequency (VF), manually search for the stored stations (VM), direct inputNumber or frequency of the radio address directly into pre-existing numbers, visit the radio frequency automatic search, automatic search browse stored station.
- It can be manual, semi-automatic, fully automatic (ATS) store up to 550 radio frequencies: FM / MW / LW station 100 each can be saved, short-wave can be saved..
- Multi-function display: can display the radio frequency, signal strength / noise ratio, temperature, battery power, and more..
MUSYSIC Professional 2 Channel 9000 Watts DJ PA Power Amplifier Signal out MU-P9K
- Stereo Output Power: "2x5600W PEAK, 2x2800W Program, 2x1400W RMS @ 2Ω" "2x2800W PEAK, 2x1400W Program, 2x700W RMS @ 4Ω" "2x1400W PEAK, 2x700W Program, 2x350W RMS @ 8Ω".
- Bridge Output Power: "5600W PEAK, 2800W Program, 1400W RMS @ 4Ω" "2800W PEAK, 1400W Program, 700W RMS @ 8Ω".
- Frequency Response: 20Hz-20KHz,+0,-1dB at watts / THD+N(20Hz-20KHz) ＜0.23％20Hz-20KHz / Siew Rate ＞30V/us / Damping Factor ＞150 / Output Circuitry Class AB / Signai to Noise Ratio ≥96dB / Cross Talk ＞80dB / lnput Sensitivity(8Ω) 1V / input lmpedance 20 k Ω baiance / 10 k Ω unbalanced unbalance balancing 20 k / 20 k /.
- Dual cooling fans / Connectors Input: XLR input, 1/4" input: XLR Output: Speakon connector Output: Speakon, locking type socket, Banana plug connection output.
- Controls Panel: the power switch, channel 1 and channel 2 channel gain control.
- After the board: working mode, pressure limit./ lndicators Panel: the power switch, channel 1 and channel 2 channel gain control.
- After the board: working mode, pressure limit./ Amplifier Protection With short circuit, overload, overheat, cut peak pressure limit, dc, soft start, relay zero current switch, super audio and radio frequency protection device..
Tecsun PL-310 fm/am Stereo World Band Dsp Receiver
- There are 6 sets mode selection:manual search radio frequency, direct input frequency numbers, manually search for the stored radio stations or directly onto a pre-existing address numbers, visit the radio frequency automatic search, automatic search browse stored station..
- Multi-function display:can display the radio frequency, signal strength / noise ratio, temperature, battery power and so on..
- AM IF bandwidth can be set to (1 ~ 6kHz)..
- use of high-quality paper cone speakers, sound quality soft Naiting..
- Health as Germany comes with a special high-quality DSP radios E402 headphones, you can enjoy to enjoy the highest quality FM stereo radio.
Amon Tech Heavy Duty Car Radio 2 Way AM/FM Radio with MP3 Player forExcavator Tractor Truck Kart Grab Crane Boat Yacht Loader Grader Earth Moving Machine
- Advanced Durable Machine: Heavy duty radio material provide a strong and durable radio, also it is a standard din size with small body, very fashion outlook.
- Worldwide Frequency: Just need to press some buttons to choose different countries' frequency for shipment(fixed frequency). User can select Europe FM frequency or USA FM frequency through software, frequency also can be fixed.
- Universal Compatible: Excavator radio suitable for excavator, tractor, truck, kart, loader, grader, earth moving machine, convenient and easy to carry, your best partner on your vehicle.
- Waterproof and dust-proof front panel : Waterproof test : JIS DO203RI standard, dust-proof test : JIS DO207FI standard, our product is in high standard quality, guarantee you it’s the best and professional radio.
- Dielectric Strength Test: Anti-seismic grade 13 in Japan JISD 1601 grades. AM/FM Radio is very stable installed onto your vehicle. 12V/24V automatically interchangeable by radio.
MUSYSIC MU-D16K Professional 2-Channel 2x8000 Watts D-Class 1.5U Power Amplifier
- Stereo Output Power: "2x8000W PEAK, 2x4000W Program, 2x2000W RMS @ 2Ω" "2x4000W PEAK, 2x2000W Program, 2x1000W RMS @ 4Ω" "2x2000W PEAK, 2x1000W Program, 2x500W RMS @ 8Ω" / Bridge Output Power: "8000W PEAK, 4000W Program, 2000W RMS @ 4Ω" "4000W PEAK, 2000W Program, 1000W RMS @ 8Ω".
- Frequency Response: 20Hz-20KHz,+0,-1dB at watts / THD+N(20Hz-20KHz) ＜0.23％20Hz-20KHz / Siew Rate ＞30V/us / Damping Factor ＞150 / Output Circuitry Class AB / Signai to Noise Ratio ≥96dB / Cross Talk ＞80dB / lnput Sensitivity(8Ω) 1V / input lmpedance 20 k Ω baiance / 10 k Ω unbalanced unbalance balancing 20 k / 20 k /.
- Three cooling fans / Connectors Input: XLR input, 1/4" input: Speakon connector Output: Speakon, locking type socket, Power Requirements: 90v-250v 50Hz.
- Controls Panel: the power switch, channel 1 and channel 2 channel gain control.
- After the board: working mode, pressure limit./ lndicators Panel: the power switch, channel 1 and channel 2 channel gain control.
- After the board: working mode, pressure limit./ Amplifier Protection With short circuit, overload, overheat, cut peak pressure limit, dc, soft start, relay zero current switch, super audio and radio frequency protection device..
MUSYSIC MU-D9600 Professional 4-Channels 2x9600 Watts D-Class 1U Power Amplifier
- Stereo Output Power: "4x4800W PEAK, 4x2400W Program, 4x1200W RMS @ 2Ω" "4x2400W PEAK, 4x1200W Program, 4x600W RMS @ 4Ω" "4x1200W PEAK, 4x600W Program, 4x300W RMS @ 8Ω" / Bridge Output Power: "2x4800W PEAK, 2x2400W Program, 2x1200W RMS @ 4Ω" "2x2400W PEAK, 2x1200W Program, 2x600W RMS @ 8Ω".
- Frequency Response: 20Hz-20KHz,+0,-1dB at watts / THD+N(20Hz-20KHz) ＜0.23％20Hz-20KHz / Siew Rate ＞30V/us / Damping Factor ＞150 / Output Circuitry Class AB / Signai to Noise Ratio ≥96dB / Cross Talk ＞80dB / lnput Sensitivity(8Ω) 1V / input lmpedance 20 k Ω baiance / 10 k Ω unbalanced unbalance balancing 20 k / 20 k /.
- Three cooling fans / Connectors Input: XLR input, 1/4" input: Speakon connector Output: Speakon, locking type socket, Power Requirements: 115v-230v 50/60 hz.
- Controls Panel: the power switch, channel 1 and channel 2 channel gain control.
- After the board: working mode, pressure limit./ lndicators Panel: the power switch, channel 1 and channel 2 channel gain control.
- After the board: working mode, pressure limit./ Amplifier Protection With short circuit, overload, overheat, cut peak pressure limit, dc, soft start, relay zero current switch, super audio and radio frequency protection device..
AD8317 1M-10GHz 60dB RF Power Meter Logarithmic RF Signal Power Detector Controller for Amplifier
- EASY TO USE :The logarithmic power meter adopts AD8317 chip design, which is convenient to use, small in size, high in efficiency, easy to install, stable and reliable, and is used for radio frequency signal power detection..
- DETECTABLE :The logarithmic power meter has strict quality control and quality assurance. It can detect the power of the radio frequency signal from -55dBm to 0dBm, and convert the radio frequency signal into a DC voltage output..
- DYNAMIC RANGE :The greater the amplitude or power of the radio frequency signal, the higher the output voltage, and the output voltage is proportional to the logarithm of the input signal amplitude, thereby expanding the dynamic range of the detection signal to 55dB..
- WIDELY USED :The logarithmic power meter adopts advanced technology and exquisite craftsmanship, and has been improved to improve durability. Logarithmic detector can be widely used in radio frequency signal detection, signal power measurement, and environmental field strength detection..
Generic Amon Tech 12v24v Bluetooth Car Excavator Radio AUX-in Slot Fmam USB Mic Mp3 for Hitachi Komatsu Kato
- Radio Frequency: Bluetooth Tractor Truck radio,all worldwide frequency in unit. You can select different frequency by pressing and holding AST and USB button together, then plus #1 for Europe FM frequency , #2 for USA FM frequency, while #3 for Japan FM frequency.
- Wide Applicatione: Our this bluetooth car radio is an industrial grade product, can be widely installed in any excavators, tractors, trucks, kart, loaders, graders, earth moving machines, etc. All users can listen to music or AM/FM radio through this car speaker,further more,you can bluetooth hands-free calling.
- Design: This grader truck radio is designed with USB, AUX jack and bluetooth. Just press BT button for seconds then you can get bluetooth. And AUX jack allows to insert 3.5mm audio plug to connect with MP3, iPod, CD. Users can listen to music or radio through them..
- Waterproof and dust-proof front panel:This excavator stereo has passed dust-proof test “JIS DO207FI standard” and waterproof test “JIS DO203RI standard,allows you to use in bad weather, also have a higher resistance to vibration than other radios.
- Easy Install: Designed with furnished pigtail that need to mount with side plates. Radio is furnished with wiring color instruction, helps you to install easily and quickly. ....
FC-3000P Ham Radio CB Frequency Counter 27Mhz-3000Mhz - High Sensitivity with CTCCSS DCS Decoder for The VHF & UHF - CB Continuous Carrier Signal, Walkie-Talkies, DMR Radio Transceivers
- ✔️ IDENTIFYING FREQUENCY - The frequency meter measures frequency parameters of the continuous carrier signal walkie-talkies , with signal strength indicator..
- ✔️ PORTABLE FREQUENCY COUNTER - Counting continuous wave signal comes from Two-way Radio. VHF & UHF frequency measurement, useful for the CB amateur Ham Radio..
- ✔️ FREQUENCY COUNTER METER RANGE - CB, HAm Radio, DMR frequency range 100Mhz-3000Mhz. Build-in DCS CTCSS Decoder Low PPM crystal time base used to achieve high accuracy measurement.
- ✔️ EASY TO OPERATE - User friendly controlled with four buttons. The DMR radio frequency counter is compact and handy when needed..
- ✔️ 100% MONEY BACK GUARANTEE 2 YEARS WARRANTY ensures this will quickly become your favorite no-risk purchase..
2PCS 2-Pin Electronic Turn Signal Flasher Relay Adjustable LED Flasher Relay Suitable for Motorcycle Turn Signal Indicator LED Flasher
- Safety Protection: Using advanced SMD patch technology, it has automatic short-circuit protection, automatic overload protection, and....
- 12V LED Flash: LED Turn Signal Relay Design, Universal 12V Motorcycle, Car, etc. Note: (Please double check your relay and make sure this is the....
- Specifications: This LED turn signal flasher relay is designed with 2 pins, working voltage: 12V, maximum power: 42W, working temperature: -40°C to....
- Easy Installation: the turn signal relay is plug and play, waterproof, and easy to install.
- please check the pin position when installing, the flash....
- Adjustable Speed: You can adjust the flashing frequency of the LED flash relay to the speed you want, slow clockwise, fast counterclockwise.
Running the Show: The Essential Guide to Being a First Assistant Director
- 【 Portable AM/FM Digital Radio 】Yonars pocket portable radio, have high sensitivity reception. Supports AM/FM 2 band stereo radio. FM frequency rangs:60-108KHZ, AM frequency rangs: 9KHZ: 522-1620KHZ /10KHZ:520-1710KHZ . Can store 70 radio stations (50 in FM, and 20 inmedium-frequency wave).
- 【 Sport radio with pedometer 】This is a sports radio with built-in Pedometer Function, can record your steps, stride length, calories burned by exercise, and distance. Highly portable, putting it in your pocket will not bring you any burden, it is the best partner for sports..
- 【 Rechargeable battery 】This walkman radio has a built-in 400MAH lithium battery, which has a long battery life and does not require frequent battery replacement, just use the attached USB to charge it. You can judge whether the power level is sufficient according to the battery symbol on the LCD screen..
- 【 Multifunctional pocket radio 】Fully automatic search and storage of radio stations/rechargeable/step counter/calorie consumption record/calculation of walking distance/key lock design to avoid misoperation/sleep timer and clock function.10-90 mins sleep time can be set in this Mini radio. You can enjoy the radio time before going to bed..
- 【 Best Gift 】This Personal Mini Ra....