Disclaimer. Anything in this article is a private opinion guaranteed by Universal Declaration of Human Rights (UDHR). The author doesn’t impose it to anybody. Parameters are shown in this article are relative, and don’t reflect standard parameters of this type of the devices. If one would use different methods of measuring (or different types of measuring devices), the result different. The author doesn’t bear any responsibility for any consequences related to devices described in this article, including a lost profit. Decisions made by a reader are implemented at his own risk. Manufactures who think they are defamed can present their own refutations and the author will publish them with (or without) changing his own opinion.
The 1st part with methods described.
The 3rd part with receivers results.
The last part with conclusions.
Part 2. Transmitters.
Table's content:
- F1, MHz - Main signal frequency in MHz
- F2, MHz - 2nd harmonic frequency in MHz
- F3, MHz - 3rd harmonic signal frequency in MHz
- L, dB - signal level in dB measured by RF-Explorer in 1,5m from transmitter antenna
Index number: TX315-1
Current consumption in TX mode
|
Dimensions, mm
|
F1, MHz
L, dB (more is better)
|
F2, MHz
L, dB (less is better)
|
F3, MHz
L, dB (less is better)
|
10mA
|
19x18x7 (w/o pins)
|
315,231MHz
-66dB
|
628,86MHz
-70dB
|
945,182MHz
-78dB
|
It's a 315Mhz module. It has a square green PCB with a big round SAW and 2008-8 and FS1000A marks on the front side. I had some modules of this type – both 315 and 433 MHz. One of 315 MHz unstable generated at 431 MHz. Others didn’t generate at all. I cannot recommend this type of modules.
Index number: TX315-2
Current consumption in TX mode
|
Dimensions, mm
|
F1, MHz
L, dB (more is better)
|
F2, MHz
L, dB (less is better)
|
F3, MHz
L, dB (less is better)
|
10mA
|
11,5x15x6
|
315,068MHz
-68dB |
N/A
|
N/A
|
It's a 315Mhz module. It has a small blue PCB with LC-technology mark on the back side. It has 1 narrow frequency about 315 MHz, but not so powerful. But there're no 2nd or 3rd harmonics (they are too weak to measure). Good module.
Index number: TX315-3
Current consumption in TX mode
|
Dimensions, mm
|
F1, MHz
L, dB (more is better)
|
F2, MHz
L, dB (less is better)
|
F3, MHz
L, dB (less is better)
|
Spiral antenna: 7mA
Pin antenna: 8mA |
10x10x3
|
Spiral antenna: 315,05Mhz
-72dB Pin antenna: 315,05Mhz -70dB |
Spiral antenna: 630,0Mhz
-97dB Pin antenna: 630,0Mhz -96dB |
N/A
|
It's a 315Mhz module. It has a small blue PCB with H34A mark on the back side. Unfortunately, it has inconvenient output pin – it’s located near power pins. The 3rd harmonic is weak to measure. It has a good matching both with spiral and pin antennas. It's a good module too.
Index number: TX433-1
Current consumption in TX mode
|
Dimensions, mm
|
F1, MHz
L, dB (more is better)
|
F2, MHz
L, dB (less is better)
|
F3, MHz
L, dB (less is better)
|
47mA
|
12,5x17x4
|
Main band:
433,79MHz -44dB 2 parasitic side bands: 447,35 and 420,23MHz -88dB |
867,79MHz -83,5dB
|
1301,64MHz
-74,0dB |
It's a 433Mhz module. It has a small green PCB. Maybe it has a bad matching with the antenna – it has the wide main band, 2 parasitic bands near the main band and even 2nd and 3rd harmonics.
Index number: TX433-2
Current consumption in TX mode
|
Dimensions, mm
|
F1, MHz
L, dB (more is better)
|
F2, MHz
L, dB (less is better)
|
F3, MHz
L, dB (less is better)
|
47mA
|
19x18x7
|
433,180MHz
-55dB |
867,444MHz
-67,5dB |
1301,708MHz
-57,5dB(!) |
It's a 433Mhz module. It has a square green PCB with a big round SAW and 2008-8 and FS1000A marks on the front side. The PCB has the same design as the TX315-1 module. So, this module was broken after 2 switchings on. And it has very strong 3rd harmonic, so matching with output circuit is very bad.
Index number: TX433-3
Current consumption in TX mode
|
Dimensions, mm
|
F1, MHz
L, dB (more is better)
|
F2, MHz
L, dB (less is better)
|
F3, MHz
L, dB (less is better)
|
16mA
|
11,5x15x6
|
433,939MHz
-66dB |
N/A
|
N/A
|
It's a 433Mhz module. It has a small blue PCB with LC-technology mark on the back side. The PCB has the same design as the TX315-2 module. It has 1 narrow frequency about 434 MHz, not so powerful. But there're no 2nd or 3rd harmonics (they are too weak to measure). Good module.
Index number: TX433-4
Current consumption in TX mode
|
Dimensions, mm
|
F1, MHz
L, dB (more is better)
|
F2, MHz
L, dB (less is better)
|
F3, MHz
L, dB (less is better)
|
88mA
|
11,5x15x7
|
Spiral antenna: 433,95Mhz
-56dB Pin antenna: 433,9Mhz -51dB |
Spiral antenna: 867,84Mhz
-95dB Pin antenna: 867,84Mhz -95dB |
Spiral antenna: 1301,8Mhz
-93dB Pin antenna: 1301,8Mhz -82dB |
It's a 433Mhz module. It has a blue PCB with STX882 v.1.2. mark on the back side and a big round SAW. A spiral antenna was included in the set. Good module with powerful output.
Index number: TX433-5
Current consumption in TX mode
|
Dimensions, mm
|
F1, MHz
L, dB (more is better)
|
F2, MHz
L, dB (less is better)
|
F3, MHz
L, dB (less is better)
|
Spiral antenna: 107mA
Pin antenna: 119mA |
19x18x5
|
Spiral antenna: 433,9Mhz
-51dB Pin antenna: 433,95Mhz -52,5dB |
Spiral antenna: N/A
Pin antenna: 867,51Mhz -73dB |
Spiral antenna: 1301,3Mhz
-77dB Pin antenna: 1301,3Mhz -87dB |
It's a 433Mhz module. It has a big green PCB with ZF-4 mark on the back side and a big round SAW. Parameters are like in the TX433-4 module. It has comparatively the same output power, but more current consumption and bad spectrum of harmonics.
Index number: TX433-6
Current consumption in TX mode
|
Dimensions, mm
|
F1, MHz
L, dB (more is better)
|
F2, MHz
L, dB (less is better)
|
F3, MHz
L, dB (less is better)
|
65mA
|
11x15x3
|
Spiral antenna: 433,95Mhz
-52dB Pin antenna: 433,95Mhz -67dB |
Spiral antenna: 867,84Mhz
-96dB Pin antenna: 867,51Mhz -93dB |
Spiral antenna: 1301,92Mhz
-96dB Pin antenna: 1301,3Mhz -90dB |
It's a 433Mhz module. It has a blue PCB with WLC-TX1 mark on the back side. It has an inconvenient output pin – it’s located near power pins. Described output power was 0,5W, but it’s a fake. With current consumption of 65mA it cannot be true. Good ordinary module for a spiral antenna, but for pin one it’s not so good.
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