Penelope - Trouble Shooting - Revision history

AB8OJ at 17:22, 3 August 2010

2010-08-03T17:22:20Z

AB8OJ: Added information on mic not working with Penelope / Magister setup. -- AB8OJ

2010-06-22T19:20:23Z

Added information on mic not working with Penelope / Magister setup. -- AB8OJ

OZ1HFT: +cat

2010-01-25T18:53:15Z

+cat

VK2NRA: /* Investigating low output power */ JP3 voltage fix

2009-05-09T19:25:13Z

‎Investigating low output power: JP3 voltage fix

VK2NRA: /* Resolution */ fixed

2009-05-09T18:50:31Z

‎Resolution: fixed

VK2NRA: /* Low Power Output - T2 Reversal */ better pics

2009-05-09T09:11:13Z

‎Low Power Output - T2 Reversal: better pics

VK2NRA: /* Investigating low output power */ wording

2009-05-09T08:44:40Z

‎Investigating low output power: wording

VK2NRA: intro para

2009-05-09T06:34:45Z

intro para

VK2NRA: ??

2009-05-09T06:31:42Z

VK2NRA: /* Low Power Output - T2 Reversal */ insert correct picture

2009-05-09T02:55:06Z

‎Low Power Output - T2 Reversal: insert correct picture

← Older revision		Revision as of 17:22, 3 August 2010
Line 43:		Line 43:

	Install shorting blocks on the two Magister I2C jumpers. They are to the left of U1 when looking at the top of the board with the Atlas connector to the bottom. The silkscreen says I2C to Atlas and the jumpers are labeled SCL and SDA. Horizontally adjacent pins should be shorted together. If you don't have any shorting blocks on hand, they can often be found on old PC expansion cards and motherboards.		Install shorting blocks on the two Magister I2C jumpers. They are to the left of U1 when looking at the top of the board with the Atlas connector to the bottom. The silkscreen says I2C to Atlas and the jumpers are labeled SCL and SDA. Horizontally adjacent pins should be shorted together. If you don't have any shorting blocks on hand, they can often be found on old PC expansion cards and motherboards.
		+
		+	== Echo in transmitted audio ==
		+
		+	(The following information is taken from an [[http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/2010-August/012894.html email]] on the OpenHPSDR discussion list, from Warren, NR0V)
		+
		+	An echo is noticed on your transmitted voice signal. It is heard both on the air and in the software "monitor" function.
		+
		+	"The short version of the solution is: Don't connect the shield/ground of
		+	the Penelope microphone input to any other system grounds. Connect it ONLY
		+	to the microphone."
		+
		+	For a more complete explanation, please see the [[http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/2010-August/012894.html message in the archive]].

	[[Category:Penelope]]		[[Category:Penelope]]

← Older revision		Revision as of 19:20, 22 June 2010
Line 33:		Line 33:

	"Steve found a bad solder joint on R20, the bias current set resistor for the DAC. Once resoldered, his Penelope works normally."		"Steve found a bad solder joint on R20, the bias current set resistor for the DAC. Once resoldered, his Penelope works normally."
		+
		+	== Microphone does not work (Penelope + Magister) ==
		+
		+	(The following information is taken from an [[http://lists.openhpsdr.org/htdig.cgi/hpsdr-openhpsdr.org/2010-January/011685.html email]] on the OpenHPSDR discussion list, from Bill, KD5TFD)
		+
		+	Using Penelope with Magister, the microphone input does not work. The transmitter itself works, as normal power output is seen in TUNE mode and other non-microphone-based modes. The PTT, +V and AUDIO jumpers are set properly for the mic in use. The mic works with other radios.
		+
		+	As shipped, Magister's I2C bus is not connected to the Atlas bus. This causes the initialization of the codec on Penelope to fail, which in turn makes the microphone inoperable.
		+
		+	Install shorting blocks on the two Magister I2C jumpers. They are to the left of U1 when looking at the top of the board with the Atlas connector to the bottom. The silkscreen says I2C to Atlas and the jumpers are labeled SCL and SDA. Horizontally adjacent pins should be shorted together. If you don't have any shorting blocks on hand, they can often be found on old PC expansion cards and motherboards.

	[[Category:Penelope]]		[[Category:Penelope]]

← Older revision		Revision as of 18:53, 25 January 2010
Line 33:		Line 33:

	"Steve found a bad solder joint on R20, the bias current set resistor for the DAC. Once resoldered, his Penelope works normally."		"Steve found a bad solder joint on R20, the bias current set resistor for the DAC. Once resoldered, his Penelope works normally."
		+
		+	[[Category:Penelope]]

@@ Line 27: / Line 27: @@
 *In [[PowerSDR]] the drive level needs to be set all the way to 100, and under SetUp, PA Settings, set all of the PA setting windows to 38.8.
 *The module "from Gerd works according to specifications while  TAPR´s Penny gives somewhat less output power due to wrong placement of transformer T2. ... I can confirm the T2 on Gerd´s Penny is turned 180 degrees" to the correct orientation. "Please note that the slider for drive has two separate settings, namely one for output power when activating PTT or the cw key and one for TUNE. Normally the output power setting for TUNE is set to a lower default value by manufacturers. Please check that the number display of the associated slider for output power really shows 100 when you click on TUNE and move it to 100 while in TUNE mode if it shows less."
-*The gain of the OpAmp output stage is about 23 dB. So for 1/2 Watt out, you need +27 dBm - 23 db or +4 dBm into T1 for full output. Check for about 1 Volt peak to peak at JP2 pin 1 or 2. Look for about 1.2 Volt peak to peak at JP3 pin 1 or 2. If not getting that, then look for problem between there and the DAC.
+*The gain of the OpAmp output stage is about 23 dB. So for 1/2 Watt out, you need +27 dBm - 23 db or +4 dBm into T1 for full output. Check for about 1 Volt peak to peak at JP2 pin 1 or 2. Look for about 600mV to 700mV peak to peak at JP3 pin 1 or 2. If not getting that, then look for problem between there and the DAC.
 *The DAC is currently set to put out a current of about 20 mA, which into a 200 Ohm transformer would produce about 4.4 Volts peak to peak, EXCEPT that the output stage of the DAC hard clips at +/- 1.1 Volts.  The power control loop in the FPGA further limits the level to keep the output out of clip. T3 is a 2:1 voltage (4:1 impedance) step down transformer, so results in 600 to 700 mV peak to peak at JP3, with the power/control loop at maximum. Look for DC voltage on the two DAC output lines.  They should both be held at 0 Volts by the transformer.  If there is any DC voltage, there is a problem with T3, or solder joints.

← Older revision		Revision as of 18:50, 9 May 2009
Line 32:		Line 32:
	=== Resolution ===		=== Resolution ===

−	~~???~~	+	"Steve found a bad solder joint on R20, the bias current set resistor for the DAC. Once resoldered, his Penelope works normally."

@@ Line 4: / Line 4: @@
 On the TAPR production boards transformer T2 was installed 180 degrees from its correct orientation:
-[[image:Penny_gerd_top_right.png|thumb|300px|right|Transformer T2 (the white box) in the CORRECT orientation]]
+[[Image:T2pictures.png|thumb|700px|right|Pictures of the TAPR board on the left and the board by Gerd on the right. Transformer T2 (the white box) in the upper right corner of each board. The right picture has the transformer installed in the CORRECT orientation. Thks to Mike AA8K]]
 :"Description of Error:
 ::Transformer T2 is rotated 180 degrees from the correct orientation.

@@ Line 23: / Line 23: @@
 . I am only getting 49mW out on the display when I select Tun in PowerSDR."</blockquote>
-Several suggestions were made:
+Email replies had several suggestions:
 *In [[PowerSDR]] the drive level needs to be set all the way to 100, and under SetUp, PA Settings, set all of the PA setting windows to 38.8.
-*The module "from Gerd works according to specifications while  TAPR´s Penny gives somewhat less output power due to wrong placement of transformer T2. ... I can confirm the T2 on Gerd´s Penny is turned 180 degrees." "Please note that the slider for drive has two separate settings, namely one for output power when activating PTT or the cw key and one for TUNE. Normally the output power setting for TUNE is set to a lower default value by manufacturers. Please check that the number display of the associated slider for output power really shows 100 when you click on TUNE and move it to 100 while in TUNE mode if it shows less."
+*The module "from Gerd works according to specifications while  TAPR´s Penny gives somewhat less output power due to wrong placement of transformer T2. ... I can confirm the T2 on Gerd´s Penny is turned 180 degrees" to the correct orientation. "Please note that the slider for drive has two separate settings, namely one for output power when activating PTT or the cw key and one for TUNE. Normally the output power setting for TUNE is set to a lower default value by manufacturers. Please check that the number display of the associated slider for output power really shows 100 when you click on TUNE and move it to 100 while in TUNE mode if it shows less."
 *The gain of the OpAmp output stage is about 23 dB. So for 1/2 Watt out, you need +27 dBm - 23 db or +4 dBm into T1 for full output. Check for about 1 Volt peak to peak at JP2 pin 1 or 2. Look for about 1.2 Volt peak to peak at JP3 pin 1 or 2. If not getting that, then look for problem between there and the DAC.
 *The DAC is currently set to put out a current of about 20 mA, which into a 200 Ohm transformer would produce about 4.4 Volts peak to peak, EXCEPT that the output stage of the DAC hard clips at +/- 1.1 Volts.  The power control loop in the FPGA further limits the level to keep the output out of clip. T3 is a 2:1 voltage (4:1 impedance) step down transformer, so results in 600 to 700 mV peak to peak at JP3, with the power/control loop at maximum. Look for DC voltage on the two DAC output lines.  They should both be held at 0 Volts by the transformer.  If there is any DC voltage, there is a problem with T3, or solder joints.

← Older revision		Revision as of 06:34, 9 May 2009
Line 1:		Line 1:
		+	Trouble shooting information and aids for the [[PENELOPE\|Penelope]] digital up converter / exciter.
		+
	== Low Power Output - T2 Reversal ==		== Low Power Output - T2 Reversal ==

← Older revision		Revision as of 06:31, 9 May 2009
Line 29:		Line 29:

	=== Resolution ===		=== Resolution ===
		+
		+	???