Convert a 27MHz toy walkie talkie to 28 MHz - YouTube
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Realistic 27 MHz 4-watt 40-channel handheld CB (citizens' band) transceiver | Science Museum Group Collection
Radio Transmitter using Crystal Oscilliator - Electrical Engineering Stack Exchange
Crystal-controlled miniature receiver
27 MHz Transmitter/receiver Pair Made With 555 Timers | Hackaday
Traxxas 2215 27MHz Radio Receiver w/ No Crystal Vintage | eBay
Anytone - AnyTone GRACE CB Radio 27 Mhz 4W AM/FM Talkie Walkie 80 channels UHF MOBILE Transceiver Hot sales
Crystal swap trick for 27 to 28 MHz AM walkie talkies - YouTube
PPT on Walkie Talkie | Final Year Project on 27MHz Walkie Talkie
27MHz Links
27 MHz Receiver
Traxxas TQ AM 27MHz Radio Transmitter - Yellow Crystal | eBay
Unlicensed 27 MHz Walkie-Talkie History | OneTubeRadio.com
Alan Yates' Laboratory - AM Walkie-Talkie Experiments
6Pairs Transmit +Receive Frequency Crystal AM/FM 27MHz Remote Control Module Transmitter Crystals for RC Boat Car FUTABA Model - AliExpress Toys & Hobbies
27 MHz Radio Transmitter using single Transistor
27MHz Links
27 MHz Transmitter Circuit - 10 Km Range | Homemade Circuit Projects