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Last modified by UT2UK on 2026/05/07 13:46
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1 -Latency measurement in remote (EAX, USB) and local modes and comparison with Flex radio (DAX v2)
1 +Измерение задержки (latency) в удаленном (EAX, USB) и локальном режимах и сравнение c Flex radio (DAX v2)
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1 -== Internal latency measurement of the ERMAK-TT transceiver ==
1 +== Измерение внутренней задержки трансивера ERMAK-TT ==
2 2  
3 -* Transmit mode (microphone input -> RF output): **45ms**
3 +* Режим передачи (микрофонный вход -> выход RF): **45мс**
4 4  
5 5  
6 6  
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7 7  [[image:1777980550259-754.png]]
8 8  
9 9  
10 -* Receive mode (RF modulator output -> headphone output): **52ms**
10 +* Режим приема (выход RF модулятора -> выход наушников): **52мс**
11 11  
12 12  
13 13  
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14 14  [[image:1777980668036-257.png]]
15 15  
16 16  
17 -== Internal latency measurement of FLEX radio ==
17 +== Измерение внутренней задержки FLEX radio ==
18 18  
19 19  * [[https:~~/~~/community.flexradio.com/discussion/8027536/signal-in-to-audio-out-rf-to-audio-latency>>https://community.flexradio.com/discussion/8027536/signal-in-to-audio-out-rf-to-audio-latency]]
20 20  * [[https:~~/~~/www.n1kdo.com/sdr-delay-measured/>>url:https://www.n1kdo.com/sdr-delay-measured/]]
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34 34  [[image:image.png]] [[image:https://us.v-cdn.net/6032377/uploads/OB7NPE9JDLNX/image.png||alt="image.png"]]
35 35  
36 36  
37 -Thanks to [[Mike-VA3MW>>url:https://community.flexradio.com/profile/Mike-VA3MW]] and [[W7NGA>>url:https://community.flexradio.com/profile/W7NGA]]
37 +Thanks to [[Mike-VA3MW>>url:https://community.flexradio.com/profile/Mike-VA3MW]] and [[W7NGA>>url:https://community.flexradio.com/profile/W7NGA]]
38 38  
39 39  
40 -== Total latency measurement of the ERMAK-TT transceiver + EAX (USB) ==
40 +== Измерение полной задержки трансивера ERMAK-TT + EAX (USB) ==
41 41  
42 -Measurements were performed on a Windows 11 PC Host + VAC by Eugene Muzychenko. The original VAC from ERMAK can also be used. They provide slightly lower latency due to optimized buffers.
42 +Измерения проводились на Windows 11 PC Host + VAC от Евгения Музыченко. Так же можно использовать оригинальные VAC  от ERMAK. Они дают немного меньшую задержку за счет оптитмизации буферов.
43 43  
44 -**Important note** - the original ERMAK VAC drivers are signed with a self-signed certificate. Therefore, driver signature verification must be disabled on the PC host.
44 +**Важный момент** - оригинальные ERMAK VAC подписаны self signed сертификатом. Поэтому, на PC host необходимо отключить проверку подписи драйверов.
45 45  
46 -1. [[EAX audio control - release history>>https://sdr-ermak.com/xwiki/bin/view/Main/ERMAK-TT/EAX%20aduio%20control%20utility%20releases/]]
46 +1. [[EAX aduio control - история релизов>>https://sdr-ermak.com/xwiki/bin/view/Main/ERMAK-TT/EAX%20aduio%20control%20utility%20releases/]]
47 47  1. [[EAX VAC Windows 10>>https://nx8619.your-storageshare.de/s/pdeEJr5mG4ix7PQ?dir=/EAX%20VAC]]
48 -1. [[Installing and configuring EAX on WINDOWS>>https://sdr-ermak.com/xwiki/bin/view/Main/ERMAK/%D0%A0%D1%83%D0%BA%D0%BE%D0%B2%D0%BE%D0%B4%D1%81%D1%82%D0%B2%D0%BE%20%D0%BF%D0%BE%D0%BB%D1%8C%D0%B7%D0%BE%D0%B2%D0%B0%D1%82%D0%B5%D0%BB%D1%8F%20%D0%95%D0%A0%D0%9C%D0%90%D0%9A/EAX%20-%20%D1%83%D1%82%D0%B8%D0%BB%D0%B8%D1%82%D0%B0%20%D0%BE%D0%B1%D0%BC%D0%B5%D0%BD%D0%B0%20%D0%B0%D1%83%D0%B4%D0%B8%D0%BE%D0%BF%D0%BE%D1%82%D0%BE%D0%BA%D0%B0%D0%BC%D0%B8%20%D1%81%20PC/%D0%A3%D1%81%D1%82%D0%B0%D0%BD%D0%BE%D0%B2%D0%BA%D0%B0%20%D0%B8%20%D0%BD%D0%B0%D1%81%D1%82%D1%80%D0%BE%D0%B9%D0%BA%D0%B0%20EAX%20%D0%B2%20%D1%81%D1%80%D0%B5%D0%B4%D0%B5%20WINDOWS/]]
49 -1. [[Installing and configuring EAX on LINUX>>https://sdr-ermak.com/xwiki/bin/view/Main/ERMAK/%D0%A0%D1%83%D0%BA%D0%BE%D0%B2%D0%BE%D0%B4%D1%81%D1%82%D0%B2%D0%BE%20%D0%BF%D0%BE%D0%BB%D1%8C%D0%B7%D0%BE%D0%B2%D0%B0%D1%82%D0%B5%D0%BB%D1%8F%20%D0%95%D0%A0%D0%9C%D0%90%D0%9A/EAX%20-%20%D1%83%D1%82%D0%B8%D0%BB%D0%B8%D1%82%D0%B0%20%D0%BE%D0%B1%D0%BC%D0%B5%D0%BD%D0%B0%20%D0%B0%D1%83%D0%B4%D0%B8%D0%BE%D0%BF%D0%BE%D1%82%D0%BE%D0%BA%D0%B0%D0%BC%D0%B8%20%D1%81%20PC/%D0%A3%D1%81%D1%82%D0%B0%D0%BD%D0%BE%D0%B2%D0%BA%D0%B0%20%D0%B8%20%D0%BD%D0%B0%D1%81%D1%82%D1%80%D0%BE%D0%B9%D0%BA%D0%B0%20EAX%20%D0%B2%20%D1%81%D1%80%D0%B5%D0%B4%D0%B5%20LINUX/]]
48 +1. [[Установка и настройка EAX в среде WINDOWS>>https://sdr-ermak.com/xwiki/bin/view/Main/ERMAK/%D0%A0%D1%83%D0%BA%D0%BE%D0%B2%D0%BE%D0%B4%D1%81%D1%82%D0%B2%D0%BE%20%D0%BF%D0%BE%D0%BB%D1%8C%D0%B7%D0%BE%D0%B2%D0%B0%D1%82%D0%B5%D0%BB%D1%8F%20%D0%95%D0%A0%D0%9C%D0%90%D0%9A/EAX%20-%20%D1%83%D1%82%D0%B8%D0%BB%D0%B8%D1%82%D0%B0%20%D0%BE%D0%B1%D0%BC%D0%B5%D0%BD%D0%B0%20%D0%B0%D1%83%D0%B4%D0%B8%D0%BE%D0%BF%D0%BE%D1%82%D0%BE%D0%BA%D0%B0%D0%BC%D0%B8%20%D1%81%20PC/%D0%A3%D1%81%D1%82%D0%B0%D0%BD%D0%BE%D0%B2%D0%BA%D0%B0%20%D0%B8%20%D0%BD%D0%B0%D1%81%D1%82%D1%80%D0%BE%D0%B9%D0%BA%D0%B0%20EAX%20%D0%B2%20%D1%81%D1%80%D0%B5%D0%B4%D0%B5%20WINDOWS/]]
49 +1. [[Установка и настройка EAX в среде LINUX>>https://sdr-ermak.com/xwiki/bin/view/Main/ERMAK/%D0%A0%D1%83%D0%BA%D0%BE%D0%B2%D0%BE%D0%B4%D1%81%D1%82%D0%B2%D0%BE%20%D0%BF%D0%BE%D0%BB%D1%8C%D0%B7%D0%BE%D0%B2%D0%B0%D1%82%D0%B5%D0%BB%D1%8F%20%D0%95%D0%A0%D0%9C%D0%90%D0%9A/EAX%20-%20%D1%83%D1%82%D0%B8%D0%BB%D0%B8%D1%82%D0%B0%20%D0%BE%D0%B1%D0%BC%D0%B5%D0%BD%D0%B0%20%D0%B0%D1%83%D0%B4%D0%B8%D0%BE%D0%BF%D0%BE%D1%82%D0%BE%D0%BA%D0%B0%D0%BC%D0%B8%20%D1%81%20PC/%D0%A3%D1%81%D1%82%D0%B0%D0%BD%D0%BE%D0%B2%D0%BA%D0%B0%20%D0%B8%20%D0%BD%D0%B0%D1%81%D1%82%D1%80%D0%BE%D0%B9%D0%BA%D0%B0%20EAX%20%D0%B2%20%D1%81%D1%80%D0%B5%D0%B4%D0%B5%20LINUX/]]
50 50  
51 51  
52 52  
53 -* Receive mode (RF modulator output -> EAX -> PC audio output): **197ms**
53 +* Режим приема (выход RF модулятора -> EAX -> аудио выход PC): **197мс**
54 54  
55 55  
56 56  
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57 57  [[image:1778050748939-595.png]]
58 58  
59 59  
60 -* Receive mode (RF modulator output -> USB audio -> PC audio output): **220ms**
60 +* Режим приема (выход RF модулятора -> USB audio -> аудио выход PC): **220мс**
61 61  
62 62  
63 63  
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64 64  [[image:1778051095734-567.png]]
65 65  
66 66  
67 -== Total latency measurement of the ERMAK-TT transceiver + EAX (USB) and Flex radio in remote mode ==
67 +== Измерение полной задержки трансивера ERMAK-TT + EAX (USB) и Flex radio в удаленном режиме ==
68 68  
69 -**Measurement program**
70 70  
71 -* **ERMAK-TT** — local connection to PC + EAX
72 -* **FlexRadio** — remote connection (~~5000 km), RTT ~~100 ms, DAX v2, "long" filters. Propagation speed ≈ 3×10⁸ m/s → latency over 5000 km (one-way) ≈ 16.7 ms; network RTT 100 ms → one-way ≈ 50 ms; total ≈ **67-70 ms margin**
73 73  
74 -**Measurement subject:**
75 -Reception of one-second pulses at 4999 kHz
76 -
77 -[[image:1778072528651-371.png]]
78 -
79 -
80 -* Red ERMAK-TT
81 -* Blue - FLEX radio. "Fast" filters (51ms)
82 -
83 -Result: 104ms-70ms=**30ms**, ** ERMAK-TT provides lower latency**
84 -
85 -[[image:1778072986007-908.png]]
86 -
87 -
88 -* Red ERMAK-TT
89 -* Blue - FLEX radio. "Fast" filters (167ms)
90 -
91 -Result: 40ms+70ms=**110ms** latency difference, **FLEX radio** **provides lower latency**
92 -
93 -[[image:1778073107052-698.png]]
94 -
95 -**Conclusions**
96 -
97 -* When using **short filters** and **DAX v1**, the latency of **FlexRadio** and **ERMAK-TT(Phoenix) ** + **EAX) **is approximately comparable.
98 -* The main contribution to latency in **DAX v1** comes from the audio stack buffers and the VAC driver; in **DAX v2 **this contribution has been substantially reduced thanks to the redesigned VAC.
99 -* In **DAX v1**, the original VAC — Virtual Audio Cable by Eugene Muzychenko was used. ([[https:~~/~~/community.flexradio.com/discussion/8027376/smartsdr-2-8-1-and-bsod>>https://community.flexradio.com/discussion/8027376/smartsdr-2-8-1-and-bsod]])
100 -
101 -
102 -
103 -[[image:1778074304325-846.png]]
104 -
105 -
106 -* In **DAX v2**, a solution based on Thin Audio Gateway (the same author) is used, which provides smaller buffers and lower latency.
107 -* **DAX v2** delivers a latency improvement of approximately **~~100 ms** compared to DAX v1.
108 -* **We plan to migrate to a similarly architected VAC/low-latency audio engine by autumn 2026.**
71 +
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