Using FM Radios without cables as PA for the Neo1973 - Question, in which countries is it legal to use 50 nW (nano Watt) FM87.5-108.0 Mhz transceiver?

Graham Auld openmoko at
Sun Dec 17 18:54:56 CET 2006

Ofcom in the UK are due to legalise them this month, it seems they've
decided on a standard which will allow these transmitters to be used in
future throught the EU AFAIK,


-----Original Message-----
From: community-bounces at
[mailto:community-bounces at] On Behalf Of Robert Michel
Sent: 17 December 2006 17:11
To: OpenMoko
Subject: Using FM Radios without cables as PA for the Neo1973 - Question,in
which countries is it legal to use 50 nW (nano Watt) FM87.5-108.0 Mhz


I haven't found a page with info in which contries 50 nW FM transceiver
would be legal to use - I know only that in Germany (mayby EU) owning and
using has become legal in spring 2006 (German official note):

There are several small adaptors on the market, quite handy are the
solutions for the ipod:

This transceiver need 40mA - so in case tha Neo1973 would have an stereo mic
in with bias (I hope so) the Wolfson's bias would be with 2 x 3mA not enough
- the tranceiver would need a battery and would be bigger than the ipod
Would a higher phantome power for the mic help?
Or a special solution for the mini-USB port to serve power, the audio signal
and maybe an I/O to select the frequency with the Neo1973?

Autotuning with help of the mic? Tune your radio to a "free"
frequency and start autotune that the Neo1973 let the tranceiver run from
87.5 to 108 untill audio software has detecte with the help of the audio-in
(mic) that the tranceiver has now the same frequency than the radio you are
using as PA for your Neo1973.

So the smartest solution would be an internal solution, it would make the
power supply and antenna question more easy and would have the posibility of

Otherwise selling propritary adapters are IMHO only profitable when there is
a big market for this propritary adapters (ipod)...

Comming to friends or to a kitchen, or just in the car and play music from
the Neo1973 via a FM stero radio is *very* usefull and sooner or later a
build in solution would be a great argument to sell smartphones.

Build in solution would bear problems to travell into countries that doesn't
allow this 50 nW transceiver.
-Would a software configuration help?
-Would be a hardware switch, removing of a jumper, removing of  a part of
the tranceiver circuit, rmoving of the tranceiver  itself necessary?

So can you contribute your know how in which contries (in yours?) are these
transceiver legal now?


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