GENERAL: Type: Amateur VHF transceiver: Frequency range: TX: 144-148 MHz RX: 144-148 MHz Tuning steps: Channelized: Frequency stability: Max ? ppm: Mode:

2022年7月4日 · 第一种方式是 VFO 或可变频率振荡器。 当您处于此模式并按下向上箭头向下箭头按钮时，频率将上升或下降。 而在 VFO 模式下，您可以通过数字键盘编辑频率，并将其输入到菜单列表中进行信息编辑。 当您在户外没有电脑时，可以快速编辑VFO，实现交流。 它就像一个临时的沟通渠道。 当然，如果你支持电台，你可以直接将 VFO 保存到频道模式。 MR代表记忆。 在此模式下，您将频率输入到存储通道中。 您可以设置许多内存通道。 使用时只需转动通道旋 …

ICOM Stations-Transceiver IC-21A. Frequenzbereich: 144–146 MHz, 24 Quarz-Kanäle; Betriebsart: FM; P out: 0,5–10 W regelbar. Model page created by Bernd P. Kieck. See "Data change" for further contributors. Here you find 315 models, 209 with images and 107 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.

2021年3月16日 · VFO是Variable Frequency Oscillator的缩写，译为可变频率振荡器。 对讲机在VFO模式时，其频率在规定范围内时是可调的，我们也称之为频率模式 。 VFO的可变频率振荡器模式是相对于CH模式频率不可调而言的。

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2023年2月14日 · アマチュア無線機、古い機種で、アイコムのic-21用の外部vfoを入手しましたが、どなたか取り付け方法を教えてください。 そのままでは取付できなくて、IC-21本体を少し改造して取り付ける・・・との情報があ...

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It is driven low by IC21, PST51A (Typo in the Circuit Description of the TS-940 Service Manual identifies it as PST5184). The PST518A is a voltage threshold sensor on the +5V line from the AVR unit. Its intent is to issue a reset to the CPU if the voltage level drops below @4.2V.

The ICOM IC-21A is a VHF transceiver. It covers 144-146 MHz for both receive and transmit. RF output is 0.5-10 W. The radio operates on 13.8V DC or mains power and weighs 7.2 kg. Dimensions are 111 × 230 × 260 mm. Features include diode matrix programmability.

There is a manual flying around the internet, claiming it's for IC-21A. It is. also available from Icom's own site. However, it's actually for IC-21 (without A) which is a bit different in design.