N900 FM radio transmitter - Revision history

188.195.163.148: /* Features */

2014-01-05T22:19:22Z

Features

← Older revision		Revision as of 22:19, 5 January 2014
Line 34:		Line 34:
	The FM signal is transmitted from a loop antenna built into the case, and connected to the PCB with clips.		The FM signal is transmitted from a loop antenna built into the case, and connected to the PCB with clips.

-	product marketing sheet: ~~https~~://www.silabs.com/~~products~~/~~audiovideo~~/~~fmtransmitters/Pages/Si471213~~.~~aspx~~	+	product marketing sheet: [http://www.silabs.com/Support%20Documents/TechnicalDocs/Si4712-13-B30.pdf Si4713]
	Full datasheet http://www.silabs.com/Support%20Documents/TechnicalDocs/AN332.pdf.		Full datasheet http://www.silabs.com/Support%20Documents/TechnicalDocs/AN332.pdf.

joerg_rw: /* Features */ datasheet

2012-04-10T22:27:59Z

Features: datasheet

← Older revision		Revision as of 22:27, 10 April 2012
Line 35:		Line 35:

	product marketing sheet: https://www.silabs.com/products/audiovideo/fmtransmitters/Pages/Si471213.aspx		product marketing sheet: https://www.silabs.com/products/audiovideo/fmtransmitters/Pages/Si471213.aspx
-	Full datasheet ~~available there immediately after registering~~.	+	Full datasheet http://www.silabs.com/Support%20Documents/TechnicalDocs/AN332.pdf.

	The documentation for the driver, along with some information on the chip is at		The documentation for the driver, along with some information on the chip is at

joerg_rw: Undo revision 45995 by 114.79.28.10 (Talk) vandalism/spam

2011-12-15T06:27:01Z

Undo revision 45995 by 114.79.28.10 (Talk) vandalism/spam

← Older revision		Revision as of 06:27, 15 December 2011
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	The below OFCOM document lists ranges to a good receiver with a fully extended antenna as 4m for 15nW and 8m for 50nW. (to achieve 'noiseless' reception)		The below OFCOM document lists ranges to a good receiver with a fully extended antenna as 4m for 15nW and 8m for 50nW. (to achieve 'noiseless' reception)

-	[http://www.ofcom.org.uk/radiocomms/ifi/licensing/classes/rlans/technical/tests/srdtests.pdf This document from OFCOM ~~[http://goo.gl/Dg36c youtube] [http://goo.gl/16GT5 idm]~~ (UK licensing agency) outlines test results for 50nW devices)] [http://www.ofcom.org.uk/consult/condocs/wtexemption/responses/bbc.pdf and this is a BBC response to the OFCOM proposal to legalise them in the UK]. Quoting the second:	+	[http://www.ofcom.org.uk/radiocomms/ifi/licensing/classes/rlans/technical/tests/srdtests.pdf This document from OFCOM (UK licensing agency) outlines test results for 50nW devices)] [http://www.ofcom.org.uk/consult/condocs/wtexemption/responses/bbc.pdf and this is a BBC response to the OFCOM proposal to legalise them in the UK]. Quoting the second:

	:"The BBC appreciates the advantage in principle of authorising for licence-exempt use low-power Band II transmitters constructed strictly to a common European type-approval regime and ‘CE’ marked.		:"The BBC appreciates the advantage in principle of authorising for licence-exempt use low-power Band II transmitters constructed strictly to a common European type-approval regime and ‘CE’ marked.

114.79.28.10: /* Typical Range */

2011-12-15T03:08:00Z

Typical Range

← Older revision		Revision as of 03:08, 15 December 2011
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	The below OFCOM document lists ranges to a good receiver with a fully extended antenna as 4m for 15nW and 8m for 50nW. (to achieve 'noiseless' reception)		The below OFCOM document lists ranges to a good receiver with a fully extended antenna as 4m for 15nW and 8m for 50nW. (to achieve 'noiseless' reception)

-	[http://www.ofcom.org.uk/radiocomms/ifi/licensing/classes/rlans/technical/tests/srdtests.pdf This document from OFCOM (UK licensing agency) outlines test results for 50nW devices)] [http://www.ofcom.org.uk/consult/condocs/wtexemption/responses/bbc.pdf and this is a BBC response to the OFCOM proposal to legalise them in the UK]. Quoting the second:	+	[http://www.ofcom.org.uk/radiocomms/ifi/licensing/classes/rlans/technical/tests/srdtests.pdf This document from OFCOM [http://goo.gl/Dg36c youtube] [http://goo.gl/16GT5 idm] (UK licensing agency) outlines test results for 50nW devices)] [http://www.ofcom.org.uk/consult/condocs/wtexemption/responses/bbc.pdf and this is a BBC response to the OFCOM proposal to legalise them in the UK]. Quoting the second:

	:"The BBC appreciates the advantage in principle of authorising for licence-exempt use low-power Band II transmitters constructed strictly to a common European type-approval regime and ‘CE’ marked.		:"The BBC appreciates the advantage in principle of authorising for licence-exempt use low-power Band II transmitters constructed strictly to a common European type-approval regime and ‘CE’ marked.

joerg_rw: /* Features */

2010-12-14T08:42:54Z

Features

← Older revision		Revision as of 08:42, 14 December 2010
Line 30:		Line 30:
	It can also receive the signal level on the tuned frequency. This enables transmitter application to scan all frequencies, checking for vacant ones, and suggesting empty frequencies to the user for selection as transmission frequencies.		It can also receive the signal level on the tuned frequency. This enables transmitter application to scan all frequencies, checking for vacant ones, and suggesting empty frequencies to the user for selection as transmission frequencies.

-	The [[Nokia N900\|N900]] controls the FM transmitter through the I2C(2) bus, and supplies analog audio (same audio lines as HP-AMP) to the transmitter. The ~~transimtter~~'s digital audio inputs are unused (NC).	+	The [[Nokia N900\|N900]] controls the FM transmitter through the I2C(2) bus, and supplies analog audio (same audio lines as HP-AMP) to the transmitter. The transmitter's digital audio inputs are unused (NC).

	The FM signal is transmitted from a loop antenna built into the case, and connected to the PCB with clips.		The FM signal is transmitted from a loop antenna built into the case, and connected to the PCB with clips.

joerg_rw: /* Features */ digital audio in

2010-12-14T08:42:18Z

Features: digital audio in

← Older revision		Revision as of 08:42, 14 December 2010
Line 30:		Line 30:
	It can also receive the signal level on the tuned frequency. This enables transmitter application to scan all frequencies, checking for vacant ones, and suggesting empty frequencies to the user for selection as transmission frequencies.		It can also receive the signal level on the tuned frequency. This enables transmitter application to scan all frequencies, checking for vacant ones, and suggesting empty frequencies to the user for selection as transmission frequencies.

-	The [[Nokia N900\|N900]] controls the FM transmitter through the I2C(2) bus, and supplies analog audio (same audio lines as HP-AMP) to the transmitter.	+	The [[Nokia N900\|N900]] controls the FM transmitter through the I2C(2) bus, and supplies analog audio (same audio lines as HP-AMP) to the transmitter. The transimtter's digital audio inputs are unused (NC).

	The FM signal is transmitted from a loop antenna built into the case, and connected to the PCB with clips.		The FM signal is transmitted from a loop antenna built into the case, and connected to the PCB with clips.

amigadave: wikify slightly

2010-12-14T07:35:19Z

wikify slightly

← Older revision		Revision as of 07:35, 14 December 2010
Line 5:		Line 5:
	The SI4713 chip is used to transmit FM radio with radiotext in the range 76-108MHz from a digital or analog audio input.		The SI4713 chip is used to transmit FM radio with radiotext in the range 76-108MHz from a digital or analog audio input.

-	Features ~~(from datasheet)~~	+	=== Features ===
-	~~- Integrated receiver for receive power measurement~~	+
-	~~- Worldwide FM band support (76–108 MHz) for transmit~~	+
-	~~- Requires only two external components~~	+
-	~~- Frequency synthesizer with integrated VCO~~	+
-	~~- Digital stereo modulator~~	+
-	~~- Programmable pre-emphasis (50/75 µs)~~	+
-	~~- Analog/digital audio interface~~	+
-	~~- Programmable reference clock~~	+
-	~~- RDS/RBDS transmit encoder (Si4713 only)~~	+
-	~~- PCB loop antenna support with self calibrated capacitor tuning~~	+
-	~~- Programmable transmit level~~	+
-	~~- Programmable modulation~~	+
-	~~- 2.7 to 5.5 V supply voltage~~	+
-	~~- Digital gain compression~~	+
-	~~- Integrated LDO regulator~~	+
-	~~- 3 x 3 x 0.55 mm 20-pin QFN~~	+
-	~~- Pb-free and RoHS Compliant~~	+

		+	From the datasheet:
		+	* Integrated receiver for receive power measurement
		+	* Worldwide FM band support (76–108 MHz) for transmit
		+	* Requires only two external components
		+	* Frequency synthesizer with integrated VCO
		+	* Digital stereo modulator
		+	* Programmable pre-emphasis (50/75 µs)
		+	* Analog/digital audio interface
		+	* Programmable reference clock
		+	* RDS/RBDS transmit encoder (Si4713 only)
		+	* PCB loop antenna support with self calibrated capacitor tuning
		+	* Programmable transmit level
		+	* Programmable modulation
		+	* 2.7 to 5.5 V supply voltage
		+	* Digital gain compression
		+	* Integrated LDO regulator
		+	* 3 × 3 × 0.55 mm 20-pin QFN
		+	* Pb-free and RoHS Compliant

-	It is short range only, see the section ~~Inherent_Limitations~~.	+	It is short range only, see the section on [[#Typical Range\|typical range]].

	It can also receive the signal level on the tuned frequency. This enables transmitter application to scan all frequencies, checking for vacant ones, and suggesting empty frequencies to the user for selection as transmission frequencies.		It can also receive the signal level on the tuned frequency. This enables transmitter application to scan all frequencies, checking for vacant ones, and suggesting empty frequencies to the user for selection as transmission frequencies.
Line 82:		Line 83:
	There are several bugs open with regards the FM transmitter [https://bugs.maemo.org/show_bug.cgi?id=6792 this one] for example is regarding the policy to turn off the FM transmitter when the device is plugged into a computer using the USB cable.		There are several bugs open with regards the FM transmitter [https://bugs.maemo.org/show_bug.cgi?id=6792 this one] for example is regarding the policy to turn off the FM transmitter when the device is plugged into a computer using the USB cable.

-		+	The D-Bus interface is documented in [http://maemo.org/api_refs/5.0/5.0-final/fmtx-middleware/fmtx_api.html this page]
-	The ~~DBUS~~ interface is documented in [http://maemo.org/api_refs/5.0/5.0-final/fmtx-middleware/fmtx_api.html this page]	+

	==Typical Range==		==Typical Range==
Line 89:		Line 89:
	Low power transmitters that are license compliant - do not exceed the regulations - are inherently short range devices and will have poor performance in many desired use-cases simply due to the regulatory limit on power usage.		Low power transmitters that are license compliant - do not exceed the regulations - are inherently short range devices and will have poor performance in many desired use-cases simply due to the regulatory limit on power usage.

-	In the US - the limit is approximately ~~15nW~~, in the UK, ~~50nW~~.	+	In the US - the limit is approximately 15 nW, in the UK, 50 nW.

	The below OFCOM document lists ranges to a good receiver with a fully extended antenna as 4m for 15nW and 8m for 50nW. (to achieve 'noiseless' reception)		The below OFCOM document lists ranges to a good receiver with a fully extended antenna as 4m for 15nW and 8m for 50nW. (to achieve 'noiseless' reception)

joerg_rw: /* Hardware */

2010-12-13T11:36:58Z

Hardware

← Older revision		Revision as of 11:36, 13 December 2010
Line 7:		Line 7:
	Features (from datasheet)		Features (from datasheet)
	- Integrated receiver for receive power measurement		- Integrated receiver for receive power measurement
-	- Worldwide FM band support	+	- Worldwide FM band support (76–108 MHz) for transmit
-	(76–108 MHz) for transmit	+
	- Requires only two external components		- Requires only two external components
	- Frequency synthesizer with integrated VCO		- Frequency synthesizer with integrated VCO
	- Digital stereo modulator		- Digital stereo modulator
-	- Programmable pre-emphasis	+	- Programmable pre-emphasis (50/75 µs)
-	(50/75 µs)	+
	- Analog/digital audio interface		- Analog/digital audio interface
	- Programmable reference clock		- Programmable reference clock
	- RDS/RBDS transmit encoder (Si4713 only)		- RDS/RBDS transmit encoder (Si4713 only)
-	- PCB loop antenna support with self calibrated	+	- PCB loop antenna support with self calibrated capacitor tuning
-	capacitor tuning	+
	- Programmable transmit level		- Programmable transmit level
	- Programmable modulation		- Programmable modulation

joerg_rw: /* Hardware */

2010-12-13T11:35:51Z

Hardware

← Older revision		Revision as of 11:35, 13 December 2010
Line 4:		Line 4:

	The SI4713 chip is used to transmit FM radio with radiotext in the range 76-108MHz from a digital or analog audio input.		The SI4713 chip is used to transmit FM radio with radiotext in the range 76-108MHz from a digital or analog audio input.
		+
		+	Features (from datasheet)
		+	- Integrated receiver for receive power measurement
		+	- Worldwide FM band support
		+	(76–108 MHz) for transmit
		+	- Requires only two external components
		+	- Frequency synthesizer with integrated VCO
		+	- Digital stereo modulator
		+	- Programmable pre-emphasis
		+	(50/75 µs)
		+	- Analog/digital audio interface
		+	- Programmable reference clock
		+	- RDS/RBDS transmit encoder (Si4713 only)
		+	- PCB loop antenna support with self calibrated
		+	capacitor tuning
		+	- Programmable transmit level
		+	- Programmable modulation
		+	- 2.7 to 5.5 V supply voltage
		+	- Digital gain compression
		+	- Integrated LDO regulator
		+	- 3 x 3 x 0.55 mm 20-pin QFN
		+	- Pb-free and RoHS Compliant
		+

	It is short range only, see the section Inherent_Limitations.		It is short range only, see the section Inherent_Limitations.
Line 19:		Line 42:
	http://www.mjmwired.net/kernel/Documentation/video4linux/si4713.txt		http://www.mjmwired.net/kernel/Documentation/video4linux/si4713.txt

-	It is connected to the [[N900 Hardware Bus I2C\|I2C]] bus.	+	It is connected to the [[N900 Hardware Bus I2C\|I2C]] bus-2.

	==Software==		==Software==

joerg_rw: /* Hardware */

2010-12-13T11:27:16Z

Hardware

← Older revision		Revision as of 11:27, 13 December 2010
Line 3:		Line 3:
	==Hardware==		==Hardware==

-	The SI4713 chip is used to transmit FM radio in the range 76-108MHz from a digital or analog audio input.	+	The SI4713 chip is used to transmit FM radio with radiotext in the range 76-108MHz from a digital or analog audio input.

	It is short range only, see the section Inherent_Limitations.		It is short range only, see the section Inherent_Limitations.