arraysolutions.com的 10 大竞争对手

dxengineering.com

Protect your sensitive electronic equipment against lightning strikes with coaxial lightning protectors. Shop now!

hamradio.com

RSPduo Dual Tuner 14-bit SDR Radio Spectrum Processor/includes SDR-UNO Software

mfjenterprises.com

Ameritron Al-811 linear amplifier gives you plenty power to bust thru QRM. You get a quiet desktop linear thats so compact itll slide right into your station -- youll hardly know its there ... until QRM sets in. Conveniently plug it into your nearest 120 VAC outlet -- no special wiring needed. Three tough 811A transmitting tubes, extra heavy duty power supply, all HF band coverage, pressurized ventilation, tuned input, dual illuminated meters, adjustable ALC & more. The first 600 watts make the difference The Al-811 gives you 600 watts PEP output -- thats nearly 2 full S-units over your barefoot rig. That could mean the difference between hearing, "Youre Q-5 armchair copy" and, "Sorry cant copy you, too much QRM." Now you wont have to stand aside while the "big guns" steal your DX. Youll be able to log some of those stations first. Going from 600 watts to the full legal limit gives you less than one S-unit increase. But is that fraction of an S-unit worth the 3 or 4 times more money itll cost you? AL-811 gives you a powerful punch at a price thats easy on your wallet. All band, All mode coverage The AL-811 covers all HF bands. Theres no compromise on WARC and most MARS bands -- you get 100% rated output. You can operate the AL-811 on all modes. Get 600 watts output PEP SSB and 500 watts output CW. You even get 400 watts on demanding continuous modes like RTTY, SSTV, FM and AM. How the low cost 811A tube resists premature failure -- even when your amplifier is mistuned First theyre constructed with widely spaced elements that minimize the chance of touching and causing a short -- even if the plate gets hot enough to melt. Second they use a directly heated thoriated tungsten filament cathode that prevents the electron emitting layer from instantly stripping off -- even if mistuning causes a sudden, sever current overload. The Ameritron AL-811 is excellent for the newcomer because its tough enough to withstand momentary mistuning. And the tubes are so inexpensive t

universal-radio.com

universal radio inc. selling new and used amateur and shortwave radio equipment since 1942

texastowers.com

Guyed Tower Package • Handles up to 13.4 sq. ft. • Rated at 110 MPH • Complete Package • Shipped Direct to Save Freight Cost

hamradiofun.com

Ham radio is a personal radio station. Although the radio operator cannot receive any monetary or other benefits by running a radio channel, ham radio is vital during emergencies when other forms of communications are disabled. Remote ham radio operators have saved lives in desperate situations. In the U.S., thousands of people are ham radio operators. Any person can start his/her ham radio channel and can communicate with other people everywhere, including up to the astronauts on the International Space Station. A ham radio station could be stationary, mobile, or temporary, but you must have a ham radio operator license to run the station. To get this license, you have to pass exams, which could be on technical or theoretical knowledge about radio. Without passing the exams, you may not get a Call sign or private frequency. The Federal Communications Commission or FCC approves issuance of the license after exams are passed. Hence, a ham radio license is all-important for a ham radio operator. A ham radio desk equipped with one of the best dual band mobile ham radios and one of the best ham microphones, makes a wonderful ham radio gift for a young person who has a desire to explore an area of science that allows direct one-on-one live communication with an astronaut.