Example of RF amplifier for DAB - Revision history

Stan: /* Power Stage */

2010-03-14T19:09:44Z

Power Stage

2010-03-14T18:53:31Z

Power Stage

2010-03-14T18:37:13Z

Filters

2010-03-14T18:11:09Z

Power Stage

2010-03-14T18:10:13Z

Power Stage

2010-03-14T17:59:01Z

Power Stage

2010-03-14T17:57:10Z

Power Stage

2010-03-14T17:22:55Z

Power Stage

2010-02-25T08:54:20Z

2010-02-25T08:54:10Z

← Older revision		Revision as of 19:09, 14 March 2010
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−	When driving this module with the OFDM signal from the USRP we keep a linear signal until 15W, 16W maximum, higher will add distortion on the signal, maybe pre-corection at the modulation could allow us to get a little bit more from it.	+	When driving this module with the OFDM signal from the USRP we keep a linear signal until 15W, 16W maximum at 220 MHz, higher will add distortion on the signal, maybe pre-corection at the modulation could allow us to get a little bit more from it.
	Using the [[WBX daughterboard]] followed by a one [[filter]] cell from Minicircuit for band 3 we obtain for g (in the Dwap player command line):		Using the [[WBX daughterboard]] followed by a one [[filter]] cell from Minicircuit for band 3 we obtain for g (in the Dwap player command line):

@@ Line 132: / Line 132: @@
 The measured gain at 220 Mhz on the one in stock here is 36 dB.
-With a small signal at the input (1 mW) we get the following gain response when sweeping the signal from 6 to 450 MHz
+With a small signal at the input (1 mW) we get the following gain response when sweeping the signal from 6 to 450 MHz (without any [[filter]])
 The second photo give more detail on the characteristic, the blue line is the power level at the input of the amplifer, the value in dB are relative to the input power.

@@ Line 142: / Line 142: @@
 When driving this module with the OFDM signal from the USRP we keep a linear signal until 15W, 16W maximum, higher will add distortion on the signal, maybe pre-corection at the modulation could allow us to get a little bit more from it.
-Using the [[WBX daughterboard]] followed by a one [[filter cell]] for band 3 we obtain for g (in the Dwap player command line):
+Using the [[WBX daughterboard]] followed by a one [[filter]] cell from Minicircuit for band 3 we obtain for g (in the Dwap player command line):
 {| border="1"

@@ Line 143: / Line 143: @@
 When driving this module with the OFDM signal from the USRP we keep a linear signal until 15W, 16W maximum, higher will add distortion on the signal, maybe pre-corection at the modulation could allow us to get a little bit more from it.
 Using the [[WBX daughterboard]] followed by a one [[filter cell]] for band 3 we obtain for g (in the Dwap player command line):
 ===Setup Pictures===

@@ Line 119: / Line 119: @@
 Power Amplifier cooling modification / input strip line filter mod / padding / Current Bias adj for better linearity / gain - input power  TBC...
-http://www.mitsubishichips.com/China/common/cfm/ePartProfile.cfm?FILENAME=ra30h2127m.pdf
 [[Image:dab_s_pw1.jpg]][[Image:dab_s_pw2.jpg]]
 [[Image:dab_s_pw3.jpg]][[Image:dab_s_pw4.jpg]]
 [[Image:dab_s_pw5.jpg]][[Image:dab_s_pw6.jpg]]
 ===Setup Pictures===

← Older revision		Revision as of 08:54, 25 February 2010
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	*Update 24/2/2010: Check the new [[WBX daughterboard]] test, a big improvement for a clean spectrum !		*Update 24/2/2010: Check the new [[WBX daughterboard]] test, a big improvement for a clean spectrum !
		+

	<big><b> NEVER CONNECT TO AN ANTENNA WITHOUT A LICENSE ! </b></big>		<big><b> NEVER CONNECT TO AN ANTENNA WITHOUT A LICENSE ! </b></big>

← Older revision		Revision as of 08:54, 25 February 2010
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	Interesting ? Yes but... before thinking to use this kind of gizmo after the USRP, the RF signal need some manipulations, avoiding any disturbance on the radio spectrum.		Interesting ? Yes but... before thinking to use this kind of gizmo after the USRP, the RF signal need some manipulations, avoiding any disturbance on the radio spectrum.
		+
		+	*Update 24/2/2010: Check the new [[WBX daughterboard]] test, a big improvement for a clean spectrum !

	<big><b> NEVER CONNECT TO AN ANTENNA WITHOUT A LICENSE ! </b></big>		<big><b> NEVER CONNECT TO AN ANTENNA WITHOUT A LICENSE ! </b></big>