guides:radio_modules
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guides:radio_modules [2012/02/21 05:34] – Added preliminary info on RadioMetrix HX1 module nigelvh | guides:radio_modules [2015/06/11 07:51] (current) – upu | ||
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+ | There are a number of radio modules in use with descriptions : | ||
+ | ^ Module | ||
+ | | Radiometrix NTX2 | Medium| Poor | Simple | Medium | 434.075 or 434.650 | FM (analogue) | [[guides: | ||
+ | | Radiometrix NTX2B | Medium| Excellent| Simple | Medium | 434.000 -> 434.750 | FM (analogue) | [[guides: | ||
+ | | Radiometrix MTX2 | Medium| Excellent| Moderate| Low | 434.000 -> 434.750 | FM (analogue) | [[guides: | ||
+ | | Radiometrix LMT2 | High | Excellent | Simple | High | 433.900 -> 434.650 | FM (analogue) | [[guides: | ||
+ | | Radiometrix TX3H | ? | Poor | Simple | High | 869.50Mhz | FM (analogue) | ||
+ | | Radiometrix HX1 | Medium | Good | Moderate | Medium | APRS 144.800/ | ||
+ | | HopeRF RFM22B | Low | Poor | Moderate | Low | 413.000 -> 453.000 | FSK (PLL) + others |[[guides: | ||
+ | |CC1101/ | ||
- | + | Notes :\\ | |
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- | + | All modules support RTTY, analogue FM ones support APRS via external DAC | |
- | ===== NTX2 ===== | + | |
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- | The [[http:// | + | |
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- | {{guides: | + | |
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- | The reglatory requirements for airborne operation on this frequency are that the channel bandwidth must be less than 25Khz and less that 10mW ERP. There are no duty cycle requirements in this frequency | + | |
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- | The NTX2 temperature stability isn't great - in addition to drift the frequency shift tightens up with decreasing temperature. | + | |
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- | **NTX2 Adjustments** | + | |
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- | Removing the sticker from the NTX2 package reveals 3 holes in the metal casing - 1 test point (I haven' | + | |
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- | With the module oriented such that the holes are facing you & the pins facing downwards, the upper adjustment screw is frequency adjustment - perhaps adjusting loading on the crystal. Testing with a 434.650MHz NTX2 I was able to push the frequency about 15KHz either way before the oscillator became unstable. | + | |
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- | The lower adjustment screw seems to be a pot adjusting the [[http:// | + | |
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- | ===== TX3H ===== | + | |
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- | The TX3H is a Radiometrix 869.5MHz module which provides 450mW of output (up to 500mW is allowed for airborne use in this frequency band). The TX3H is a 5V Wide-band FM module which like the NTX2 has analogue | + | |
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- | {{guides: | + | |
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- | TX3H temperature stability is worse than the NTX2 (as might be expected of this higher frequency module) - also noticeable heat is generated by the module due to the higher power and lower efficiencies at higher frequencies. | + | |
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- | The reglatory requirements of airborne operation in this band are a channel bandwidth of less than 25KHz, less than 500mW ERP and less than 10% duty cycle. The latter requirement reduces the heat disapation issues. | + | |
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- | ===== HX1 ===== | + | |
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- | The HX1 is a Radiometrix 2m module which provides 300mW of output. The HX1 is a 5V Narrow-band | + | |
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- | {{guides: | + |
guides/radio_modules.1329802471.txt.gz · Last modified: 2012/02/21 05:34 by nigelvh