5.8G analog receiver comparison (RX5808, RX5880 modules suitable for FPV and FR632 RX)

649 Replies

While 1.2G video is working very well for flying around obstacles, it also has own limitations. 2.4G video is somewhere in middle – small VTX, smaller antennas and good enough penetration, but unsuitable for flying in city (WiFi everywhere) and in meetings (2.4G RC adds a lot of noise even on 2370/2510 channels).

So, i moved back to 5.8G with some of my copters. Did simple RSSI-based diversity, added RX5808 modules to my HMD… Works good enough for everyday flying, but i noticed, that my friend can fly further using FR632 RX. LOS Range is acceptable for both, but he was flying further over obstacles  and in buildings.

Ordered similar FR632 and decided to test, why it is better. Tested if it’s working, disassembled, took pictures of all components. Also purchased several RX5808 modules to compare. Built “OLED-RX5808-Pro” diversity (using wires – all high-freq parts are in module, should not matter much in theory) for comparison…

So, what we got:

I had mini copter with VTX and antenna, used the same hardware on all tests. Had the same route and approx the same speed for each test, was holding copter at the same place, ~6cm from antenna. On receiving end – RX antennas are fixed in one position, only RX’es are exchanged. I guess, environment variations between tests are very similar. Also, 5.8G is still almost unused in my house, noise floor is still very low (i checked with RF explorer); someone is using one AP on opposite end of house, should not matter much, but i moved further away from that AP and used 5685MHz for all tests.

Video consists from several parts:

  1. “Stock” hardware comparison, first scene. I was using FR632 (lots of photos online) and few different RX’es:
      1.  RX5832 – uses different module compared to others. Sensitivity “on paper” is lower, compared to RX5808 (-85dB vs -90dB), but reality is different story… Channel order is a bit weird (boscam channels are “A” band, etc), but everything else is pretty much simple (band – long press, channel change – short press).
        I replaced SMA-RP connector with SMA and slightly shortened pins, prob. will solder directly on module if i decide to use this module in my HMD.
        rx5832_btm rx5832
      2. My HMD, using RX5808 modules, with SMA soldered directly to module (with shortened pins – only ~1.5mm remaining, to minimize reflections and loss. No picture from inside (glued in), but from outside it looks like (5.8G is in top-right side, 2.4G/1.2G modules are on left):
        hmd_top
      3. RX5808-Pro OLED diversity (picture is with all mods – additional grounding near SMA, etc):
        mine_btm mine_top

    So, in first part is just comparison between different RX’es – 5808 mounted on PCB, 5808 with “direct SMA mount”, 5880 inside FR632. IMO FR632 clearly holds victory…

  2. Diversity test – used helical + skew-planar antennas. Helical was pointing approx into required direction (i probably missed a bit, because i remember that i can have good enough video with helical pointed into required direction – but anyway, that was more “diversity test” and antenna direction remained the same in all tests). Again, FR632 looks not bad, but i do not know any RSSI-based diversity controller which would work really well.
  3. Disassembled FR632, unsoldered one module (not easy task to do – LCD is close, you can’t use hot air on bottom module pins, so need to work with soldering iron). Close-up RX5808 and RX5880:
    sidebyside_btm sidebyside_top
    Then soldered RX5808 module (with SPI mod) on FR632 – so i can test both modules on the same PCB.
    fr632_top fr632_front
    (one module has removable cover – RX5880, another is solid-soldered – RX5808)
  4. Soldered RX5880 module from FR632 on that PRO diversity and tested again. Removed all possibly-resonating tracks on PCB (on RF side), added additional ground, shorted pins – i guess should be good enough to minimize reflections and not radiate stuff to outside.

….took maybe 4 evenings to finish all tests ;-)

Conclusions:

  1. RX5880 and RX5808 are different. RX5880 is slightly better, compared to RX5808 (in all tests). SPI control and pinouts are the same so if you plan to do new RX for your needs – try to find RX5880
  2. Higher sensitivity on FR632 is probably due to two components – better modules (RX5880) and good PCB design (only guess). The same RX5808 module which was performing very bad on D-Pro – was working well (ok, acceptable) on FR632

I do not like FR632 form factor and design (requires to press button to power on, diversity triggering isn’t configurable), so i will try to clone PCB frontend and re-test (FR632 uses Nuvoton N79E814 as SPI controller and probably diversity controller, no idea if firmware can be modified). FR632 uses Coplanar Waveguide with Ground (at least looks like – see fig. 39), should be easy to calculate required widths.

Also… 2.4VTX with the same rated power output and omnidirectional antennas = fully flyable (with some snow) image 1.5 story below. 5.8G just plain sucks when you want to fly over buildings…

UPDATE 2016.02: uploaded video again (G deleted my acc) and tested RD40 – its somewhere in middle between FR632 and RX5880. Nothing exceptional.

649 thoughts on “5.8G analog receiver comparison (RX5808, RX5880 modules suitable for FPV and FR632 RX)”

  1. beyourhealthnow

    Thanks for this helpful article! I’ve been looking for natural
    ways to support balanced daily wellness and my
    overall wellness and this gave me some useful ideas to
    think about. Appreciate you sharing it.

  5. https://eng-cholibrium.com/

    Thanks for this helpful article! I’ve been looking for natural ways
    to support my heart health and overall wellness and this gave me some useful ideas to think
    about. Appreciate you sharing it.

  14. Java Burn

    Thanks for this helpful article! I’ve been looking
    for natural ways to support balanced daily wellness and my overall wellness and this gave me some useful ideas to think about.

    Appreciate you sharing it.

  15. Kapelnica ot zapoya_jjsr

    Люди помогите советом Муж просто потерял себя Родственники не знают что делать В больницу тащить страшно Короче, единственное что вытащило из запоя — капельница от алкоголя спб анонимно Сняли ломку и стабилизировали состояние В общем, жмите чтобы сохранить — капельница от похмелья в санкт петербурге [url=https://lechenie.kapelnicza-ot-zapoya-sankt-peterburg.ru]капельница от похмелья в санкт петербурге[/url] Капельница от запоя — это реальный выход Перешлите тем кто в такой же ситуации

  16. FitSpresso

    Thanks for this helpful article! I’ve been looking for natural ways to support
    my overall wellness and this gave me some useful ideas. FitSpresso is something I’ve been reading about lately.
    Appreciate the info. http://travel.miltsov.org/

  18. Femicore

    Thanks for this helpful article! I’ve been looking for natural ways to support my overall wellness
    as a woman and this gave me some useful ideas to think about.
    Appreciate you sharing it.

  23. xhealth

    Thanks for this helpful article! I’ve been looking for natural ways to
    support balanced daily wellness and my overall wellness
    and this gave me some useful ideas to think about. Appreciate you sharing it.

  25. Cholibrium

    Thanks for this helpful article! I’ve been looking for natural ways
    to support my heart health and overall wellness and this gave me some useful
    ideas to think about. Appreciate you sharing it.

  26. dostavka_idei

    Ищете быстрый способ [url=https://alkomos.ru/]алкоголь 24[/url] прямо сейчас — большой выбор и быстрая круглосуточная доставка на дом.
    Обучение персонала и строгие процедуры идентификации уменьшают вероятность продаж несовершеннолетним.

  31. Vivod iz zapoya na domy_hest

    Здорова, народ Брат снова сорвался Родственники не знают что делать Таблетки не помогают Короче, единственное что вытащило из запоя — прокапаться от алкоголя на дому качественно Через пару часов человек пришёл в себя В общем, вся инфа по ссылке — прокапаться от алкоголя на дому [url=https://kruglosutochno.vyvod-iz-zapoya-na-domu-moskva-jst.ru]прокапаться от алкоголя на дому[/url] Не ждите пока станет хуже Перешлите тем кто в такой же ситуации

  33. karkasnyy_sbei

    Если вы мечтаете о быстром и надежном жилье, обратите внимание на [url=https://karkasnye-doma-pod-klyuch13.ru]строительство каркасных домов спб[/url], которые сочетают в себе качество, современный дизайн и доступную цену.
    Каркасные технологии продолжают развиваться, улучшая характеристики и расширяя возможности строительства.

  35. plugnplay

    Running CS:GO on an iPad is a topic plenty of Australian gamers are curious about, and honestly it’s far more viable than most people expect, particularly with how far portable gaming tech has come lately, so I want to break down the best way to get it running for anyone looking to stay in the game away from a gaming PC, starting with [url=https://plugnplay.re/]https://plugnplay.re/[/url] as a useful resource for configuration tips that actually work on portable devices. The most important thing to understand is that Counter-Strike natively isn’t available on iOS or Android out of the box, so the approach most serious players rely on comes down to remote play — options such as Xbox Cloud Gaming make it possible to run Counter-Strike straight onto an iPad over a solid internet connection. The connection quality is genuinely the biggest variable — anything below 30ms ping tends to create noticeable delay making competitive play frustrating, especially when you’re on a hotel Wi-Fi consider use a personal 4G hotspot to get a more steady experience. There’s genuinely useful hardware and configuration guidance at https://plugnplay.re/ that goes into the real-world setup questions so you’re not working it out alone. Controller support is a huge consideration before you start playing — using on-screen buttons for a shooter like CS2 are genuinely brutal next to a decent Bluetooth controller, with controllers like the Xbox Wireless Controller work well across most iOS and Android devices and make cloud gaming on a tablet far more playable. Screen size matters more of a role than most players expect — anything under an 8-inch display gets tight for spotting opponents across the map, which means if you own a larger iPad Pro that’s going to give you a real advantage when reading the map and spotting players. To wrap it up, account for power consumption — streaming games chews through power quickly, which means a a portable charger or keeping your tablet on charge during longer sessions is the difference between getting through a full game and watching your screen go dark.

  36. Vivod iz zapoya na domy_dxKa

    Москва, всем привет Муж просто потерял себя Родственники не знают что делать Нужна срочная помощь на дому Короче, единственное что вытащило из запоя — вывод из запоя на дому срочно Через пару часов человек пришёл в себя В общем, не потеряйте контакты — вывод из запоя наркология [url=https://anonimnyj.vyvod-iz-zapoya-na-domu-moskva-jst.ru]вывод из запоя наркология[/url] Звоните прямо сейчас Перешлите тем кто в такой же ситуации

  38. Vivod iz zapoya na domy_vaer

    Москва, всем привет Муж просто потерял себя Родственники не знают что делать В больницу тащить страшно Короче, только это реально спасло — капельница от запоя на дому с препаратами Поставили капельницу с детоксикационным раствором В общем, жмите чтобы сохранить — нарколог запой [url=https://kodirovanie.vyvod-iz-zapoya-na-domu-moskva-jst.ru]https://kodirovanie.vyvod-iz-zapoya-na-domu-moskva-jst.ru[/url] Вывод из запоя на дому — это реальный выход Перешлите тем кто в такой же ситуации

  39. dizaynersk_dsPt

    Откройте для себя комфорт и стиль с [url=https://www.divany-premium-klassa.ru/]дизайнерские диваны[/url] — идеальный выбор для тех, кто ценит эксклюзивность и безупречное качество.
    Такая мебель отражает характер владельцев и стилистическое направление.

    Наполнитель и жесткость подушек существенно влияют на удобство.

    Бежевая, серая и кремовая палитры служат универсальной базой для декора.

    Надежная конструкция и крепежи обеспечивают долговечность использования.

  44. DonaldAllog

    Непосредственному производственному процессу литья предшествует трудоёмкая и долгая подготовка, включающая следующие этапы:
    Какие дефекты изделий могут быть при литье пластмасс под давлением и как от них избавиться?

    Этапы литья пластмасс под давлением

    Сырье из первого узла быстро инжектируется в форму под высоким давлением, формируя внешнее покрытие изделия https://xn—-8sbarordjywcadg3le.xn--p1ai/

  45. Narkolog na dom_soKt

    Слушайте кто знает Близкий человек уже несколько дней в запое Дети напуганы Нужен врач прямо сейчас Короче, врач приехал и поставил систему — вызов нарколога на дом анонимно с лицензией Осмотрел и поставил капельницу В общем, вся инфа по ссылке — наркологическая помощь на дому краснодар [url=https://alkogolizm.narkolog-na-dom-krasnodar11.ru]https://alkogolizm.narkolog-na-dom-krasnodar11.ru[/url] Нарколог на дом — это реальный выход Перешлите тем кто в такой же ситуации

  46. Silver Currency

    I was seaгching for reliable information aboսt valuaƄle coins and hiѕtorical currency.

    I enjoyed reading this post.
    The topic ⲟf coin valuｅs and rare coins deѕerves more attention.
    Great work ᧐n the site.

    My blog … Silver Currency

Leave a Reply

Your email address will not be published. Required fields are marked *