--- title: "Solving the Yaesu VX-6r's silent modulation problem without replacing the microphone" url: 'https://ra1ahq.blog/en/uluchshenie-modulyacii-yaesu-vx-6r-bez-zameny-mikrofona' markdown: 'https://ra1ahq.blog/en/uluchshenie-modulyacii-yaesu-vx-6r-bez-zameny-mikrofona.md' lang: en date: '2020-07-22' description: 'After several years of using the Yaesu VX-6r portable transceiver, it developed an unpleasant drawback - quiet modulation in the 144 MHz range. Symptoms - at the repeater’s “round table” the presenter could not make out the call sign, and when answering a regular call, the correspondents ran away in fear with the words “sorry, I can’t receive you, see you later.” 😏 The reason for this is the reduced modulation level, which appears as a quiet and unintelligible signal. What i' taxonomy: category: - blog tag: - трансивер archives_month: - jul_2020 archives_year: - '2020' --- # Solving the Yaesu VX-6r's silent modulation problem without replacing the microphone 22 July 2020 ![Solving the Yaesu VX-6r's silent modulation problem without replacing the microphone](https://ra1ahq.blog/images/3/6/a/b/d/36abd52be5dda2539b7cd66e54eb7a8f7d015934-vx6r.jpg)8:32 ### Solving the Yaesu VX-6r's silent modulation problem without replacing the microphone [трансивер](https://ra1ahq.blog/en/tag:%D1%82%D1%80%D0%B0%D0%BD%D1%81%D0%B8%D0%B2%D0%B5%D1%80) 22 July 2020 8:32 After several years of using the Yaesu VX-6r portable transceiver, it developed an unpleasant drawback - quiet modulation in the 144 MHz range. Symptoms - at the repeater’s “round table” the presenter could not make out the call sign, and when answering a regular call, the correspondents ran away in fear with the words “sorry, I can’t receive you, see you later.” 😏 The reason for this is the reduced modulation level, which appears as a quiet and unintelligible signal. What is the reason for the decrease in modulation level? In menu 27 HLF.DEV-OFF ​​is turned off, 37 - MCGAIM 9 at maximum. I believe there is not one reason, but several: - the setting was made at the factory for one volume level, but over time the microphone parameters “gone” - possibly affected by the protective membrane in front of the microphone, which could have moved and covered the microphone more tightly (stuck) - The microphone contacts have oxidized a little (since it is a capsule type and is not soldered). One solution is to replace the microphone (there are [video](https://www.youtube.com/watch?v=S0KHTZFa8BE)) did not suit me - although I have experience in disassembling electronics (laptops), and soldering is not needed, violating the security of the VX-6r is undesirable. Besides, you don’t want to look for a replacement microphone from an outdated cell phone. As a result, I found a simple way to return the modulation volume - using the service menu. This modification is described on the website mods.dk: To enter the engineering menu of the VX-6r transceiver you need to: - set the VFO frequency to 440.000 and turn off the device. - Then, hold down the Band, Internet and 0 keys, without releasing them, press the Power button. Menu navigation is done: - by turning the knob of the valcoder (encoder) - to navigate through menu items - pressing the keyboard button V/M - to change the parameter - rotation of the valcoder (encoder) - to change (increase or decrease) the parameter value - press V/M again and move to the next menu item with the encoder - to save the value - Band button - to move to setting the next band (51, 144, 222, 432 MHz) - Hm/Rv (Home/Reverse) button - to exit the engineering menu. Microphone gain (modulation) adjustment is made in the "**deU**". The default value for the 145 MHz band was 62. For 52MHz it was 90, for 440 it was 120. Я уincreased the “deU” setting value in all ranges to 135. (Adjustment limits are from 1 to 255). The control was carried out while being at an average distance of ~4 km from WebSDR, based on speech intelligibility in conditions of an average signal (level approximately S6-S7). To do this, on the web sdr on the free frequency 145.425, he began recording, pronounced the call sign and completed the recording, then listened to it on his smartphone. After setting up, correspondents began to answer the first time, noted a pleasant, intelligible modulation and had long conversations, which had not happened before. 😄 A more correct way - instrument control is not available to me. You can only observe on the WebSDR waterfall or on the RTL-SDR receiver so that the modulation does not go beyond the 25 kHz wide channel (Wide). 🔥 What should the signal width be after adjusting the modulation? For simplex channels and N-FM modulation used in the VHF 144 and 432 MHz bands, 18 kHz was mentioned. (This is the average between Narrow 12.5 kHz and Wide 25 kHz). Although in Russia, on repeaters, in my opinion, louder modulation is adopted, 20-25 kHz - this is how most operators work. From my point of view, we should focus on standards. An official document indicating the FM modulation width for the amateur radio service in Russia: [DECISION dated July 15, 2010 N 10-07-01. On the allocation of radio frequency bands for radio-electronic equipment of the amateur and amateur satellite services](https://digital.gov.ru/uploaded/files/prilozhenie-k-resheniyu-gkrch-18-45-02.pdf) Permissible classes of radiation in the ranges of 144 and 432 MHz: - 2K70J3E - single-sideband suppressed carrier telephony (USB), with a maximum bandwidth of 2.7 kHz - 6K00A3E - two-way amplitude telephony with a bandwidth of 6 kHz. - 11K0F3E - frequency modulation with a bandwidth of 11 kHz (narrow modulation, or Narrow) for channels with a step of 12.5 kHz - 16K0F3E - frequency modulation with a bandwidth of 16 kHz (for channels with a step of 25 kHz) - 20K0F3E - frequency modulation with a bandwidth of 20 kHz (for channels with a step of 25 kHz) We immediately dismiss the 11 kHz modulation - it’s quiet. Used only for satellites (with a corresponding receiver tuned to the “narrow” version of narrowband FM). In addition, quiet modulation can be obtained if you enable menu item 27 - HLF.DEV (Half Deviation - the “narrow” deviation is half of the usual one, i.e. the volume level is reduced by 3 dB). There remain two “loud” options for FM modulation width - 16 kHz and 20 kHz. With modulation *wider* than 20 kHz at peak speech volumes 🔊 an overmodulation effect is possible (wheezing, distortion, a dense signal that is not pleasant to the ear). Therefore, I choose medium-width modulation, with a band of about 16-18 kHz - it has less distortion, more distinct speech, with clean high-frequency notes 🎶. Sources: ** \*[http://www.mods.dk/view.php?ArticleKey=15825aee15eb335chk13fav559f166ee8&i=1-yasu-VH-BR-Fix-for-lov-audio-on-70km](https://www.mods.dk/view.php?ArticleKey=15825aee15eb335cc13f9b559f166ee8&i=1-yaesu-VX-6R-Fix-for-low-audio-on-70cm) ### Related publications [ ![](https://ra1ahq.blog/images/f/0/7/3/d/f073db0974d49c70443dc0c7730f2bca5dd0763c-img20250514112442.jpg) Control the transmission of a radio station via the COM port using RTS or DTR signals ](https://ra1ahq.blog/en/upravlenie-peredachei-radiostancii-po-com-portu-signalami-rts-ili-dtr) [ ![](https://ra1ahq.blog/images/e/8/1/0/2/e8102900933966f52378ea64311e4c071d3d66af-chirp.png) Installing Chirp Next on an antiX bootable USB flash drive ](https://ra1ahq.blog/en/ustanovka-chirp-next-na-zagruzochnuyu-fleshku-antix) [ ![](https://ra1ahq.blog/images/1/c/e/2/6/1ce2665e66397e101d427357ca78bba9fca20e12-thumb-pdf.png) WSJTX\_improved 2.7.1 user manual ](https://ra1ahq.blog/en/programma-wsjtx_improved-2-7-1-rukovodstvo-polzovatelya) [ ![](https://ra1ahq.blog/images/b/1/6/d/1/b16d133b88aaf88d437645c62b5d0dfc09f3e6b0-picokeyer.webp) Electronic telegraph key Ultra PicoKeyer from HamGadgets ](https://ra1ahq.blog/en/elektronnyi-telegrafnyi-klyuch-ultra-picokeyer-ot-hamgadgets) [ ![](https://ra1ahq.blog/images/f/2/8/b/0/f28b05aaf82cf1854f49332ade359e029a21f9be-bar.png) CW macros for FLdigi ](https://ra1ahq.blog/en/makrosy-cw-dlya-fldigi) [ Backward](https://ra1ahq.blog/en/volnistye-serebristye-oblaka-13-iyulya-2020 "Previuous page") [ Forward ](https://ra1ahq.blog/en/raduga-nad-piterom "Next page") ## Languages - [Русский](https://ra1ahq.blog/uluchshenie-modulyacii-yaesu-vx-6r-bez-zameny-mikrofona) - [English](https://ra1ahq.blog/en/uluchshenie-modulyacii-yaesu-vx-6r-bez-zameny-mikrofona) - [Deutsch](https://ra1ahq.blog/de/uluchshenie-modulyacii-yaesu-vx-6r-bez-zameny-mikrofona) - [Français](https://ra1ahq.blog/fr/uluchshenie-modulyacii-yaesu-vx-6r-bez-zameny-mikrofona) - [中文 (简体) (cn)](https://ra1ahq.blog/zh-cn/uluchshenie-modulyacii-yaesu-vx-6r-bez-zameny-mikrofona) ## Theme ## RSS feeds [ Atom 1.0](https://ra1ahq.blog/en/.atom) [ RSS](https://ra1ahq.blog/en/.rss) ## Popular tags [APRS](https://ra1ahq.blog/en/tag:APRS) [CW](https://ra1ahq.blog/en/tag:CW) [DX](https://ra1ahq.blog/en/tag:DX) [FM](https://ra1ahq.blog/en/tag:FM) [Linux](https://ra1ahq.blog/en/tag:Linux) [VHF](https://ra1ahq.blog/en/tag:VHF) [antennas](https://ra1ahq.blog/en/tag:antennas) [firefox](https://ra1ahq.blog/en/tag:firefox) [morse](https://ra1ahq.blog/en/tag:morse) [soundtrack](https://ra1ahq.blog/en/tag:soundtrack) [video](https://ra1ahq.blog/en/tag:video) [windows](https://ra1ahq.blog/en/tag:windows) [youtube](https://ra1ahq.blog/en/tag:youtube) [КВ](https://ra1ahq.blog/en/tag:%D0%9A%D0%92) [ТВ](https://ra1ahq.blog/en/tag:%D0%A2%D0%92) [УКВ](https://ra1ahq.blog/en/tag:%D0%A3%D0%9A%D0%92) [антенны](https://ra1ahq.blog/en/tag:%D0%B0%D0%BD%D1%82%D0%B5%D0%BD%D0%BD%D1%8B) [безопасность](https://ra1ahq.blog/en/tag:%D0%B1%D0%B5%D0%B7%D0%BE%D0%BF%D0%B0%D1%81%D0%BD%D0%BE%D1%81%D1%82%D1%8C) [длинные волны](https://ra1ahq.blog/en/tag:%D0%B4%D0%BB%D0%B8%D0%BD%D0%BD%D1%8B%D0%B5%20%D0%B2%D0%BE%D0%BB%D0%BD%D1%8B) [путешествия](https://ra1ahq.blog/en/tag:%D0%BF%D1%83%D1%82%D0%B5%D1%88%D0%B5%D1%81%D1%82%D0%B2%D0%B8%D1%8F) [религия](https://ra1ahq.blog/en/tag:%D1%80%D0%B5%D0%BB%D0%B8%D0%B3%D0%B8%D1%8F) [соревнования](https://ra1ahq.blog/en/tag:%D1%81%D0%BE%D1%80%D0%B5%D0%B2%D0%BD%D0%BE%D0%B2%D0%B0%D0%BD%D0%B8%D1%8F) [спутники](https://ra1ahq.blog/en/tag:%D1%81%D0%BF%D1%83%D1%82%D0%BD%D0%B8%D0%BA%D0%B8) [средние волны](https://ra1ahq.blog/en/tag:%D1%81%D1%80%D0%B5%D0%B4%D0%BD%D0%B8%D0%B5%20%D0%B2%D0%BE%D0%BB%D0%BD%D1%8B) [схемы](https://ra1ahq.blog/en/tag:%D1%81%D1%85%D0%B5%D0%BC%D1%8B) [тесты](https://ra1ahq.blog/en/tag:%D1%82%D0%B5%D1%81%D1%82%D1%8B) [трансивер](https://ra1ahq.blog/en/tag:%D1%82%D1%80%D0%B0%D0%BD%D1%81%D0%B8%D0%B2%D0%B5%D1%80) [управление](https://ra1ahq.blog/en/tag:%D1%83%D0%BF%D1%80%D0%B0%D0%B2%D0%BB%D0%B5%D0%BD%D0%B8%D0%B5) [фотографии](https://ra1ahq.blog/en/tag:%D1%84%D0%BE%D1%82%D0%BE%D0%B3%D1%80%D0%B0%D1%84%D0%B8%D0%B8) ## Random post [ I'll be lucky!](https://ra1ahq.blog/en/random) ## Archive of posts - [ October 2026 ✒ 6 ](https://ra1ahq.blog/en/archives_month:oct_2026) - [ September 2026 ✒ 9 ](https://ra1ahq.blog/en/archives_month:sep_2026) - [ August 2026 ✒ 6 ](https://ra1ahq.blog/en/archives_month:aug_2026) - [ July 2026 ✒ 13 ](https://ra1ahq.blog/en/archives_month:jul_2026) - [ June 2026 ✒ 8 ](https://ra1ahq.blog/en/archives_month:jun_2026) - [ May 2026 ✒ 2 ](https://ra1ahq.blog/en/archives_month:may_2026) - [ April 2026 ✒ 6 ](https://ra1ahq.blog/en/archives_month:apr_2026) - [ March 2026 ✒ 3 ](https://ra1ahq.blog/en/archives_month:mar_2026) - [ February 2026 ✒ 7 ](https://ra1ahq.blog/en/archives_month:feb_2026) - [ January 2026 ✒ 8 ](https://ra1ahq.blog/en/archives_month:jan_2026) - [ December 2025 ✒ 12 ](https://ra1ahq.blog/en/archives_month:dec_2025) - [ November 2025 ✒ 9 ](https://ra1ahq.blog/en/archives_month:nov_2025) - [ October 2025 ✒ 8 ](https://ra1ahq.blog/en/archives_month:oct_2025) - [ September 2025 ✒ 5 ](https://ra1ahq.blog/en/archives_month:sep_2025) - [ August 2025 ✒ 8 ](https://ra1ahq.blog/en/archives_month:aug_2025) - [ July 2025 ✒ 6 ](https://ra1ahq.blog/en/archives_month:jul_2025) - [ June 2025 ✒ 10 ](https://ra1ahq.blog/en/archives_month:jun_2025) - [ May 2025 ✒ 4 ](https://ra1ahq.blog/en/archives_month:may_2025) - [ April 2025 ✒ 4 ](https://ra1ahq.blog/en/archives_month:apr_2025) - [ March 2025 ✒ 4 ](https://ra1ahq.blog/en/archives_month:mar_2025) - [ February 2025 ✒ 11 ](https://ra1ahq.blog/en/archives_month:feb_2025) - [ December 2024 ✒ 8 ](https://ra1ahq.blog/en/archives_month:dec_2024) - [ November 2024 ✒ 2 ](https://ra1ahq.blog/en/archives_month:nov_2024) - [ October 2024 ✒ 8 ](https://ra1ahq.blog/en/archives_month:oct_2024) - [ September 2024 ✒ 3 ](https://ra1ahq.blog/en/archives_month:sep_2024) - [ August 2024 ✒ 5 ](https://ra1ahq.blog/en/archives_month:aug_2024) - [ July 2024 ✒ 9 ](https://ra1ahq.blog/en/archives_month:jul_2024) - [ June 2024 ✒ 6 ](https://ra1ahq.blog/en/archives_month:jun_2024) - [ May 2024 ✒ 7 ](https://ra1ahq.blog/en/archives_month:may_2024) - [ April 2024 ✒ 5 ](https://ra1ahq.blog/en/archives_month:apr_2024) - [ March 2024 ✒ 5 ](https://ra1ahq.blog/en/archives_month:mar_2024) - [ February 2024 ✒ 5 ](https://ra1ahq.blog/en/archives_month:feb_2024) - [ January 2024 ✒ 6 ](https://ra1ahq.blog/en/archives_month:jan_2024) - [ December 2023 ✒ 7 ](https://ra1ahq.blog/en/archives_month:dec_2023) - [ November 2023 ✒ 4 ](https://ra1ahq.blog/en/archives_month:nov_2023) - [ October 2023 ✒ 8 ](https://ra1ahq.blog/en/archives_month:oct_2023) - [ September 2023 ✒ 7 ](https://ra1ahq.blog/en/archives_month:sep_2023) - [ August 2023 ✒ 4 ](https://ra1ahq.blog/en/archives_month:aug_2023) - [ July 2023 ✒ 7 ](https://ra1ahq.blog/en/archives_month:jul_2023) - [ June 2023 ✒ 7 ](https://ra1ahq.blog/en/archives_month:jun_2023) - [ May 2023 ✒ 5 ](https://ra1ahq.blog/en/archives_month:may_2023) - [ April 2023 ✒ 6 ](https://ra1ahq.blog/en/archives_month:apr_2023) - [ March 2023 ✒ 5 ](https://ra1ahq.blog/en/archives_month:mar_2023) - [ February 2023 ✒ 2 ](https://ra1ahq.blog/en/archives_month:feb_2023) - [ January 2023 ✒ 5 ](https://ra1ahq.blog/en/archives_month:jan_2023) - [ December 2022 ✒ 7 ](https://ra1ahq.blog/en/archives_month:dec_2022) - [ November 2022 ✒ 8 ](https://ra1ahq.blog/en/archives_month:nov_2022) - [ October 2022 ✒ 6 ](https://ra1ahq.blog/en/archives_month:oct_2022) - [ September 2022 ✒ 9 ](https://ra1ahq.blog/en/archives_month:sep_2022) - [ August 2022 ✒ 8 ](https://ra1ahq.blog/en/archives_month:aug_2022) - [ July 2022 ✒ 4 ](https://ra1ahq.blog/en/archives_month:jul_2022) - [ June 2022 ✒ 9 ](https://ra1ahq.blog/en/archives_month:jun_2022) - [ May 2022 ✒ 7 ](https://ra1ahq.blog/en/archives_month:may_2022) - [ April 2022 ✒ 3 ](https://ra1ahq.blog/en/archives_month:apr_2022) - [ March 2022 ✒ 4 ](https://ra1ahq.blog/en/archives_month:mar_2022) - [ February 2022 ✒ 6 ](https://ra1ahq.blog/en/archives_month:feb_2022) - [ January 2022 ✒ 7 ](https://ra1ahq.blog/en/archives_month:jan_2022) - [ December 2021 ✒ 7 ](https://ra1ahq.blog/en/archives_month:dec_2021) - [ November 2021 ✒ 7 ](https://ra1ahq.blog/en/archives_month:nov_2021) - [ October 2021 ✒ 7 ](https://ra1ahq.blog/en/archives_month:oct_2021) - [ September 2021 ✒ 10 ](https://ra1ahq.blog/en/archives_month:sep_2021) - [ August 2021 ✒ 6 ](https://ra1ahq.blog/en/archives_month:aug_2021) - [ July 2021 ✒ 7 ](https://ra1ahq.blog/en/archives_month:jul_2021) - [ June 2021 ✒ 7 ](https://ra1ahq.blog/en/archives_month:jun_2021) - [ May 2021 ✒ 7 ](https://ra1ahq.blog/en/archives_month:may_2021) - [ April 2021 ✒ 4 ](https://ra1ahq.blog/en/archives_month:apr_2021) - [ March 2021 ✒ 4 ](https://ra1ahq.blog/en/archives_month:mar_2021) - [ February 2021 ✒ 3 ](https://ra1ahq.blog/en/archives_month:feb_2021) - [ January 2021 ✒ 4 ](https://ra1ahq.blog/en/archives_month:jan_2021) - [ December 2020 ✒ 8 ](https://ra1ahq.blog/en/archives_month:dec_2020) - [ November 2020 ✒ 2 ](https://ra1ahq.blog/en/archives_month:nov_2020) - [ October 2020 ✒ 3 ](https://ra1ahq.blog/en/archives_month:oct_2020) - [ September 2020 ✒ 3 ](https://ra1ahq.blog/en/archives_month:sep_2020) - [ August 2020 ✒ 5 ](https://ra1ahq.blog/en/archives_month:aug_2020) - [ July 2020 ✒ 5 ](https://ra1ahq.blog/en/archives_month:jul_2020) - [ June 2020 ✒ 8 ](https://ra1ahq.blog/en/archives_month:jun_2020) - [ May 2020 ✒ 10 ](https://ra1ahq.blog/en/archives_month:may_2020) - [ April 2020 ✒ 4 ](https://ra1ahq.blog/en/archives_month:apr_2020) - [ March 2020 ✒ 2 ](https://ra1ahq.blog/en/archives_month:mar_2020) - [ January 2020 ✒ 1 ](https://ra1ahq.blog/en/archives_month:jan_2020) - [ December 2019 ✒ 2 ](https://ra1ahq.blog/en/archives_month:dec_2019) ## Search ## Weather forecast [На 14 дней](https://world-weather.ru/pogoda/russia/saint_petersburg/14days/) [world-weather.ru](https://world-weather.ru/) --- ## Navigation - Parent: [RA1AHQ](https://ra1ahq.blog/en/index.md) - Previous: [Rainbow over St. Petersburg](https://ra1ahq.blog/en/raduga-nad-piterom.md) - Next: [Wavy noctilucent clouds July 13, 2020](https://ra1ahq.blog/en/volnistye-serebristye-oblaka-13-iyulya-2020.md)