Talk:LPD433

Why does SRD redirect here? It seems there are more relavent things that you could redirect to. (System refrence document is what comes to mind) — Preceding unsigned comment added by 68.97.3.177 08:45, 29 December 2006‎ (talk • contribs)

I'm not sure about the rest of the Europe but in Romania LPD is free, but not for voice!!! It's for remote controls and other devices. Using a walkie talkie in LPD is illegal!89.136.54.196 (talk) 14:55, 29 January 2009 (UTC)

Licence free or not
In the second paragraph the article says "Low Power Device 433 MHz (LPD433) transceiver radios are short range, licence free communication devices..."

and below the table it reads "LPD433 usage is not legal in the United States without a licence. "

So is it licence free or not licence free?

Michilans (talk) 10:16, 24 March 2010 (UTC)


 * License-free spectrum allocations vary from International Telecommunication Union region to another. As briefly mentioned in the ISM band article, the 433 MHz band used by LPD433 devices, if used in Region 1 (Europe and Africa), does not require a license -- however, it does require a license if used in Region 2 (the Americas). Similarly, the 915 MHz band used by other devices (many of them listed at 33-centimeter band), if used in Region 2 (the Americas), does not require a license -- however, it does require a license if used in Region 1 (Europe and Africa). For the same reason -- inconsistent spectrum allocation -- a world phone is supposed to transmit and receive in one frequency band in one part of the world, and other frequency bands in other parts of the world. How can we make these articles less confusing? --DavidCary (talk) 14:02, 1 November 2011 (UTC)
 * How is it now? Had a hack at including the above explanation in the article. --Wtshymanski (talk) 14:28, 1 November 2011 (UTC)


 * It's license free, even in the US, if the power level is low enough. For example, wireless thermometers that have an outdoor temperature probe, and an indoor receiver, will often operate in the 433 or 434 MHz ISM band. This, by definition, makes them an LPD433 (lower power device for 433MHz) device. So yes, LPD433 devices can in fact be used without an FCC issued ham radio license in the US, as these wireless outdoor thermometers don't require a license to use, and they are LPD433 devices. The key issue is that the RF power level they output must be kept quite low. I don't know exactly what that power threshold for license free operation is though. It's probably somewhere in the FCC regulations, but I'm not sure which one I should be looking at to find this info (there's literally thousands of FCC regulations). Benhut1 (talk) 04:32, 16 February 2017 (UTC)

SRD 860
The section on SRD860 devices doesn't specify a jurisdiction, but in the UK it is permissible to use up to 500mW on band C per Ofcom interface specification IR2030/1/19. 87.194.185.81 (talk) 14:01, 8 March 2012 (UTC)


 * Looks like the 868-869 MHz band is a recent extension to the ISM band primarily intended for short-range license-free telemetry, alarms, and digital data transmission, according to ECC Rec. 70-03, Annexes 1 and 7; this corresponds with marketing materials for OEM IC products such as.
 * I can not find any license-free SRD860 hand-held transcievers currently in production, or any references that audio/voice communication is allowed outside 863-865 MHz band. --Dmitry (talk•contibs) 09:51, 20 March 2012 (UTC)

I have split SRD860 to a separate article Short-range device, since it's range is far more broad than just LPD433. --Dmitry (talk•contibs) 20:45, 28 March 2012 (UTC)

Analogue voice in UK
The article read as if analogue voice was illegal in the UK. It was until 2006, now it is most certainly legal. I know it's not the most sensible voice allocation, but it is here legitimately. I have since changed the article to this effect. Mongoosander (talk) 21:21, 5 November 2012 (UTC)

UK Type Approval
This article says that UK LPD devices must be type-approved. The UK got rid of the type approval system back in the early 00's, and has replaced it with a combination of compliance with the R&TEE and the Interface Requirements. As such, the hardware requirements are much more flexible in the UK than elsewhere where strict "type approval" is mandatory. The harmonised spec listed in the IR is not mandatory, but merely informative. As such, I've removed the reference the "type-approved" and made "integral antenna" sentence in the first paragraph clearer that it may not apply to all countries.212.159.95.67 (talk) 18:11, 29 August 2014 (UTC)