Just a short review of a book called “ABC of Electricity” published in 1889 (intended for a younger audience), and endorsed by Thomas A. Edison. Very interesting to see the state of technology and how it is presented, especially given that this was a few years before Lorentz’ Electron theory was published.
5-35Mhz Shortwave Radio Balun DIY Kit Short Antenna Balun 1:49-49:1 100W HAM Stable HAM Equipment EFHW Antenna
$22.99 (as of December 9, 2023 06:02 GMT +00:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)It only needs to be equipped with a vibrator of 20 meters in length, which can naturally resonate in the four amateur bands of 7, 14, 21, and 28, and the influence of the height-changing resonance point is very small. Frequency: 5-35MHZ Suitable for ... read more
Super Antenna MR1710 SuperWire Radial Set for HF Vertical Antennas 17m 15m 12m 11m 10m Bands ham Radio MP1 Ground Plane
$39.99 (as of December 9, 2023 06:02 GMT +00:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)THIS IS: The model MR1710 SuperWire Radial Set by Super Antenna. It is for all Super Antenna MP1 portable HF antenna systems. Made by Super Antenna, designed as part of the /backpack /base /travel /mobile /portable antenna system for Ham Radio. It is... read more
1pc Balun 1:49-49:1 BalunHalf-Wave EFHW Antenna 100W Short Four Band 5-35MHZ End Fed Short
$24.11 (as of December 9, 2023 06:02 GMT +00:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)It only needs to be equipped with a vibrator of 20 meters in length, which can naturally resonate in the four amateur bands of 7, 14, 21, and 28, and the influence of the height-changing resonance point is very small. Suitable for with certain hands-... read more
1:64 Balun End Fed Half Wave Antenna Balun 1-30MHz 100W PEP EFHW Balun
$39.99 (as of December 9, 2023 05:43 GMT +00:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)1:64 Balun End Fed Half Wave Antenna Balun 1-30MHz 100W PEP EFHW Balun Frequency range: 1-30MHz Power: ssb
CHA EMCOMM III PORTABLE
$190.94 (as of December 9, 2023 05:52 GMT +00:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)1 X CHA EMCOMM III matching box 1 X 73' Copper Clad KEVLAR Wire (-70°C to 150°C) (Radiator) 1 X 25' Copper Clad KEVLAR Wire (-70°C to 150°C) (Counterpoise) 10M to 160M
Kaito KA500 5-way Powered Solar Power,Dynamo Crank, Wind Up Emergency AM/FM/SW/NOAA Weather Alert Radio with Flashlight,Reading Lamp and Cellphone Charger, Yellow
$49.95 (as of December 9, 2023 00:05 GMT +00:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)6-way powered portable emergency radio with hand crank generator, solar panel, compartment for 3 AA batteries (not included), 5V USB input, 5V AC/DC input with a wall power adapter (sold separately), built-in NiMH replaceable and rechargeable battery... read more
PRUNUS Retro Portable Radio AM FM Shortwave Radio Transistor Battery Operated Vintage Radio with Bluetooth Speaker, 3-Way/AC Power Sources,AUX TF Card USB Disk MP3 Player (2023 Newest)
5% Off【Radio With Excellent Reception】 Equipped with powerful DSP chip and 50cm long retractable antenna, this analog tuning vintage radio has excellent signal quality to pick up enough stations. Comes with big old-school tuner dial with compact tuning kno... read more
PRUNUS J-166 Portable Radio AM FM, Battery Operated with Tuning Light, Back Clip, Excellent Reception for Indoor & Outdoor Emergency Radio, FM Portable, Transistor
50% Off【Portable Design】You can hold mini radio by one hand. it's small enough to put it in emergency kit. This FM AM radio measures 69*128*28mm with weight only 119g (without batteries), close to the size of iPhone 7. More importantly, thanks to its back c... read more
Avantree Boombyte - Portable Digital FM Radio with Bluetooth Speaker, Superb Sound, Metal Finish, MP3 Player, Support Micro SD Card & USB Audio Input, Long Play Time, Rechargeable, Easy to Use.
16% Off[4-IN-1 FUNCTIONALITY] Use the Avantree Boombyte to enjoy your favorite FM radio stations, stream music from a Bluetooth enabled device, play music from a USB drive, or play music from an SD card. [INCREDIBLE VOLUME & SOUND] The Boombyte’s dual drive... read more
NXGKET Walkie Talkies for Adults Long Rang NOAA Weather Alerts, Rechargeable Walkie Talkies 2 Way Radio 22 FRS Channel with 1800mAh Li-ion Battery Charger USB-C Cable Outdoor Cruises Camping, 4 Pack
20% OffPowerful long Range Coverage: Up to 5 mile communication range, depending on terrain and conditions. With 22 channels and 121 privacy codes, totaling 2,662 combinations, easy to find an available channel regardless of brand by being on the same chann... read more
Walkie Talkies for Adults Long Range-Wishouse Handheld 2 Way Radios Rechargeable,Hiking Accessories Camping Gear Gift for Kids with Lamp,SOS Siren,NOAA Weather Alert,Easy to Use (Blue Orange 2 Pack)
40% OffLONG RANGE TRANSMISSION AND CRYSTL CLEAR SOUND — With upgraded custom helix gain antenna, super penetration, and lossless transmission technology. You can speak clearly and your kids can hear clearly within 1 mile in the yard or indoors. Longer range... read more
Baofeng Walkie Talkies for Adults Long Range Walkie Talkie with Acoustic Tube earpiece Rechargeable 2-Way Radios Handheld Two-Way Radios Transceiver Kids Walky Talky with USB Base Charger for Camping
$23.99 (as of December 8, 2023 08:15 GMT +00:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)✅【Multifunctional】Out Of Box——Up to 16 Channels;High Power;50CTCS;105CDCSS;VOX;Flashlight;Scanning;Low Battery Alarm;Lightweight.FCC ID: 2AJGM-BF888S. ✅【Long Range Mini Walkie Talkie For Adults】In open areas, the distance can be up to 3 miles. If in ... read more
PowerBear Portable Radio | AM/FM, 2AA Battery Operated with Long Range Reception for Indoor, Outdoor & Emergency Use | Radio with Speaker & Headphone Jack (Black)
16% OffSmall, compact and easy to use design: Powerbear’s handheld radio was designed to be an on the go-the-radio that is small enough to be with you all the time. Its dimensions are 4.6 x 2.7 x 1.1 inches and it weighs 3.7 oz Portable FM/AM Radio stations... read more