RF Radio Frequency 無線電

quote of wiki about RF –

http://en.wikipedia.org/wiki/Radio_frequency

Radio frequency (RF) is a rate of oscillation in the range of about 3 kHz to 300 GHz, which corresponds to the frequency of radio waves, and the alternating currents which carry radio signals. RF usually refers to electrical rather than mechanical oscillations; however, mechanical RF systems do exist (see mechanical filter and RF MEMS).

Although radio frequency is a rate of oscillation, the term “radio frequency" or its abbreviation “RF" are also used as a synonym for radio – i.e. to describe the use of wireless communication, as opposed to communication via electric wires.

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my experiment and understanding

Tube Radio RCA Victor 5Q56
https://xiaolaba.wordpress.com/2017/07/15/tube-radio-rca-victor-5q56/

 

WIFI internet radio

ESP8266, MP3 網路收音機, Audio Dithering, http://wp.me/ph3BR-21t

ESP8266, MP3 網路收音機, 想起沒有筆記的 ATmega8 音樂盒, http://wp.me/ph3BR-20L

Delta-Sigma encoder, C code and test result, https://xiaolaba.wordpress.com/2017/07/10/delta-sigma-encoder-c-code-and-test-result/

 

Si4735 & KT0913, similar radio receiver chip but very different marketing strategy
http://wp.me/ph3BR-1S2

Tube Radio Feilo ShangHai 飛樂 261-11, AM756 CNR-1 中國之聲, 再聽聽中國好聲音
http://wp.me/ph3BR-1RS

不用電池的FM收音機, FM Crystal Radio, 距離17Km收聽台北正聲電台FM104.1
http://wp.me/ph3BR-1Ry

不用電池的FM收音機, FM Crystal Radio, 台北朝聖 NCC
http://wp.me/ph3BR-1Ri

ETC 聽得見
https://xiaolaba.wordpress.com/2017/01/12/etc-%e8%81%bd%e5%be%97%e8%a6%8b/

不用電的FM收音機, FM Crystal Radio, 距離12Km收聽 FM91.1 大溪電台
http://wp.me/ph3BR-1R3

SONY ICF-7600, FM / MW / SW radio, repair
http://wp.me/ph3BR-1QR

Tube Radio Feilo ShangHai 飛樂 261-11, 6P1 購買電阻準備下次中國好聲音
http://wp.me/ph3BR-1Qi

Tube Radio Feilo ShangHai 飛樂 261-11, 6P1 中國好聲音
http://wp.me/ph3BR-1NW

Tube Radio Feilo ShangHai 飛樂 261-11, 6P1 音頻放大
http://wp.me/ph3BR-1Ny

不用電的 AM FM 收音機, Crystal Radio, 600uA – 500uA, under the broadcasting antenna
http://wp.me/ph3BR-1Nu

少年无线电爱好者(上册下册) Teenage amateur radio
http://wp.me/ph3BR-1N0

Tube Radio Feilo ShangHai 飛樂 261-11, 收台OK了
http://wp.me/ph3BR-1MR

SDR and Hong Kong AM broadcasting preset
http://wp.me/ph3BR-1MH

不用電的AM收音機, AM Crystal Radio, HI-FI recording for Taiwan Radio Xinzhu
http://wp.me/ph3BR-1Kz

不用電的AM收音機, AM Crystal Radio, HI-FI recording for audio of an antenna setup
http://wp.me/ph3BR-1Kq

不用電的FM收音機, FM Crystal Radio, 高保真錄音 HI-FI recording
http://wp.me/ph3BR-1Kf

用電的FM收音機, FM Crystal Radio, KHH 測試
http://wp.me/ph3BR-1K5

不用電的AM收音機, AM Crystal Radio, KHH 測試
http://wp.me/ph3BR-1Jo

不用電的AM收音機, AM Crystal Radio, XiHu Rest area 測試
http://wp.me/ph3BR-1JQ

不用電的AM收音機, AM Crystal Radio, KHH 測試
http://wp.me/ph3BR-1Jo

FM Radio LC Tank circuit, build and tune air coil for FM crystal radio set

Tube Radio Feilo ShangHai 飛樂 261-11, 初試啼聲

Radio, Intermediate Frequency CAN, IF-CAN, 中週, 中頻變壓器

Tube Radio Feilo ShangHai 飛樂 261-11

SDR and to compile my own user interface with preset radio station

SDR and AM 675 kHZ 756KHZ listening, ShenZhen of China

SDR 251KHZ, .- .–. Sangean ATS-909X

SDR and AM 693 kHZ listening at Taiwan in Tainan industrial zone

SDR and BCC AM 648 kHz listening at Taiwan northern, self contained speaker radio

SDR, PA0RDT antenna, attempts to clone such active antenna

SDR and BCC AM 531 kHZ listening at Taiwan northern

SDR and Tayloe Detector, really an invention of this era !?

BPM 短波收音機能聽到的授時訊號, BFS 又如何

SONY ICF-P26, SANGEAN SR-35, AM-FM 收音機, 音質和價格無關

MITSUBISHI SAVRIN INSPIRE, Door Key Remote and the radio 車門鎖遙控器

Kolin KCD-SH03 FM 收音機, 難道買到機皇?

試圖DIY 簡單FM收音機

Wave Media 雄濤電台, DAB 數碼廣播 DAB 收音機, 可以像 DRM 收音機一樣十分低成本 DIY 嗎 !?

Softrock 收音機, 學費越來越貴了      http://xiaolabadiy.tumblr.com/post/62498883551/softrock

Softrock 收音機, 又運到北美去了

MC68HC908QT2, experiment of JFET crystal oscillator

Xtal oscillator, comparison to basic configurations with BJT and FET

Amplitude modulation tutorial & AM radio transmitter circuit, my learning

Phase Shift Oscillator 移相震盪器實驗

Secrets of RF Circuit Design, ebook, https://xiaolaba.wordpress.com/2012/04/18/secrets-of-rf-circuit-design-ebook-2/

27MHz 遙控車, 了解了接收器的震盪器如何運作, TRANSISTOR COMMON BASE CONFIGURATION

27MHz 遙控車, 修修補補後, 破碎的遙控恢復工作, 但是遙控距離只有一米左右, RF Fornt-end of receiver & transimitter design

27MHz 遙控車, 姪兒的被破碎的玩具

SDR (Software Defined Radio), 軟件定義的收音機, 老外們最近兩個月玩得很活躍, 用DVB-T制式的 USB電視棒

70KHz LF receiver used to reveal if Taiwan’s time source is broadcasting

70KHz LF receiver, ipad version of Software Defined Radio, the iSDR

70KHz LF receiver, experiment of loop antenna to tune with FM transmitter

70KHz LF receiver, different waveform and DDS performance

70KHz LF receiver, to understand sine wave of DDS and used lookup table

70KHz LF receiver, experiment of loop antenna

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