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Modifications for the Icom IC-718 Transceiver - Amfone
http://amfone.net/Amforum/index.php?action=dlattach;topic=35466.0;attach=40813
too much audio. Stock Mic Fix This modification will get you a nice crisp high end out of the Icom HM-36 mic: Replace the 0.33 uF cap (C-1) with a 33 uF cap. Install a 33K resistor in series with the negative end of C-1 and the board. Put the previously removed 0.33 uF …
Icom IC-275H (IC 275 H IC275H) transceiver mods reviews ...
http://www.hampedia.net/icom/ic-275h-improve-voice-synthesizer.php
Icom IC-275H (IC 275 H IC275H) Improve voice synthesizer and side tone audio Remove C214 (.47 uf capacitor) from the main board. Install a .1 mf 16V barrier layer capacitor in series with a 2.2 K 1/8W resistor from the emitter of Q58 and the base of Q59 on the foil side of the board. More Icom Radioamateur Transceivers Icom VHF/UHF Handhelds:
Upgrading the ICOM IC-705 with BHI’s Amazing Noise ...
https://qrper.com/2021/08/upgrading-the-icom-ic-705-with-bhis-amazing-noise-reduction-module/
The basic idea is to interrupt the IC-705’s audio path just upstream of the audio power amplifier (IC273, Main Board) and insert the BHI module, and power it from 5-15 volts inside the IC-705. First things first– here are two important references you’ll want to have on hand: BHI NEDSP1901-KBD Installation and Operating manual
Increasing the SSB/AM audio RX & TX bandwidth on the ICOM ...
http://www.wz5q.net/docs/ea3hru_ic756_rx_and_tx_bandwidth_mods.pdf
This mod explains how to extend the audio RX and TX bandwidth of SSB and AM modes on the ICOM IC-756 (nonPro). By replacing a few passive components, the TX bandwidth can easily be audio increased to 5 kHz and beyond. Introduction The 756 AM/SSB TX bandwidth is limited to about 2.7 kHz natively.
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