ARROW uBITX Group Purchase - Revision history

68.49.160.191 at 17:44, 16 April 2018

2018-04-16T17:44:58Z

← Older revision		Revision as of 13:44, 16 April 2018
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	** The PA is reported to be quite sensitive to SWR / reflected power. Make sure to use a good dummy load for power measurement.		** The PA is reported to be quite sensitive to SWR / reflected power. Make sure to use a good dummy load for power measurement.
	* It has been reported that the schematic has an error: <one of the diodes> is shown backwards.		* It has been reported that the schematic has an error: <one of the diodes> is shown backwards.
			* Audio "pops"
			** http://ubitx.net/2018/03/05/updated-circuit-from-va7at-for-removing-audio-pops/
	----		----
	'''Building Hints and Tips'''		'''Building Hints and Tips'''

141.213.185.113 at 16:15, 6 April 2018

2018-04-06T16:15:26Z

← Older revision		Revision as of 12:15, 6 April 2018
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	* AGC circuit		* AGC circuit
	** VK2ETA simple software AGC mod (see mailing list)		** VK2ETA simple software AGC mod (see mailing list)
			** [http://www.lukaszruta.pl/omega_dok/v2/omega2_sch.pdf AGC circuit built into Omega transceiver]
	** G7JUR used an audio AGC board by Walford Electronics (G3PCJ).		** G7JUR used an audio AGC board by Walford Electronics (G3PCJ).
	*** Disconnected the yellow wire from the top of the Volume pot. Yellow wire to the input of the AGC board via a 10 K resistor.		*** Disconnected the yellow wire from the top of the Volume pot. Yellow wire to the input of the AGC board via a 10 K resistor.

Ab8oj at 01:52, 4 April 2018

2018-04-04T01:52:48Z

← Older revision		Revision as of 21:52, 3 April 2018
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	* AGC circuit		* AGC circuit
	** VK2ETA simple software AGC mod (see mailing list)		** VK2ETA simple software AGC mod (see mailing list)
			** G7JUR used an audio AGC board by Walford Electronics (G3PCJ).
			*** Disconnected the yellow wire from the top of the Volume pot. Yellow wire to the input of the AGC board via a 10 K resistor.
			*** Output to the top of the Volume pot. Removed R235 and connected top of C252, to top of the Volume pot via 1 K resistor and 0.1 microfarad in series (Cap stops DC on the input of the audio amp ) This now puts the CW side tone in after the AGC board.
			*** also replaced the TDA2822M with a LM380-8 will need a bit of jiggling with the pin connections. hint turn it upside down. The LM380-8 will work from 10 to 18 volts, and has built in thermal protection.
	** K9HZ summary of options		** K9HZ summary of options
	***... audio range passband...Benefit: saves your ears, $0.02 diode, trivially easy to implement.Bad: only protects your ears... not RF sections from excessive signal and overload. Not a true AGC signal for "s" meter, only an audio strength.Comment: Save the $0.02 diode, turn the damn volume down and live with the IF overload.		***... audio range passband...Benefit: saves your ears, $0.02 diode, trivially easy to implement.Bad: only protects your ears... not RF sections from excessive signal and overload. Not a true AGC signal for "s" meter, only an audio strength.Comment: Save the $0.02 diode, turn the damn volume down and live with the IF overload.

Ab8oj at 01:36, 4 April 2018

2018-04-04T01:36:58Z

← Older revision		Revision as of 21:36, 3 April 2018
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	** http://ubitx.net/fix-fix-uneven-tx-output-across-bands/		** http://ubitx.net/fix-fix-uneven-tx-output-across-bands/
	** The PA is reported to be quite sensitive to SWR / reflected power. Make sure to use a good dummy load for power measurement.		** The PA is reported to be quite sensitive to SWR / reflected power. Make sure to use a good dummy load for power measurement.
			* It has been reported that the schematic has an error: <one of the diodes> is shown backwards.
	----		----
	'''Building Hints and Tips'''		'''Building Hints and Tips'''

Ab8oj at 17:27, 1 April 2018

2018-04-01T17:27:37Z

← Older revision		Revision as of 13:27, 1 April 2018
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	* KD2NDR port to Teensy		* KD2NDR port to Teensy
	* [https://vk4pln.blogspot.com.au/2018/03/ubitx-am-bci-filter-35mhz-high-pass_31.html VK4PLN AM broadcast filter (3.5 MHz high-pass filter)]		* [https://vk4pln.blogspot.com.au/2018/03/ubitx-am-bci-filter-35mhz-high-pass_31.html VK4PLN AM broadcast filter (3.5 MHz high-pass filter)]
	[https://vk4pln.blogspot.com.au/2018/03/raduinoi2c-board.html VK4PLN Raduino board replacement {fixes and I2C)]		* [https://vk4pln.blogspot.com.au/2018/03/raduinoi2c-board.html VK4PLN Raduino board replacement {fixes and I2C)]
	----		----
	'''Enclosure Ideas'''		'''Enclosure Ideas'''
	----		----
	'''ARROW Rig Showcase'''		'''ARROW Rig Showcase'''

Ab8oj at 17:27, 1 April 2018

2018-04-01T17:27:22Z

← Older revision		Revision as of 13:27, 1 April 2018
Line 35:		Line 35:
	* KD2NDR port to Teensy		* KD2NDR port to Teensy
	* [https://vk4pln.blogspot.com.au/2018/03/ubitx-am-bci-filter-35mhz-high-pass_31.html VK4PLN AM broadcast filter (3.5 MHz high-pass filter)]		* [https://vk4pln.blogspot.com.au/2018/03/ubitx-am-bci-filter-35mhz-high-pass_31.html VK4PLN AM broadcast filter (3.5 MHz high-pass filter)]
			[https://vk4pln.blogspot.com.au/2018/03/raduinoi2c-board.html VK4PLN Raduino board replacement {fixes and I2C)]
	----		----
	'''Enclosure Ideas'''		'''Enclosure Ideas'''
	----		----
	'''ARROW Rig Showcase'''		'''ARROW Rig Showcase'''

Ab8oj at 17:24, 1 April 2018

2018-04-01T17:24:19Z

← Older revision		Revision as of 13:24, 1 April 2018
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	Things related to the uBITX radio group purchase made by a number of ARROW members.		Things related to the uBITX radio group purchase made by a number of ARROW members.

	~~Mailing list for all BITX radios:~~ https://groups.io/g/BITX20		[https://groups.io/g/BITX20 Mailing list for all BITx radios]

	~~Huge resource page by ZL1AXG:~~ http://ubitx.net/		[http://ubitx.net/ Huge resource page by ZL1AXG]

	~~Map of BITx users:~~ http://bitxmap.com		[http://bitxmap.com Map of BITx users]
	----		----
	'''Problems, Issues and Glitches''' - significant issues reported by builders		'''Problems, Issues and Glitches''' - significant issues reported by builders
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	----		----
	'''Recommended Mods'''		'''Recommended Mods'''
	* ~~KD8CEC software~~		* [http://www.hamskey.com/ KD8CEC software]
	** http://www.hamskey.com/
	----		----
	'''Advanced Mods'''		'''Advanced Mods'''
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	***... Full range integrated Passband (front end through audio section)...Benefit: True AGC on all levels, no overload or distortion of any stage. AGC signal for "s" meter (can be calibrated to real signal strength by reference).Bad: Very complicated, impacts every RF/IF/Audio stage. Lots of mods and parts.Comment: A CW ops dream.		***... Full range integrated Passband (front end through audio section)...Benefit: True AGC on all levels, no overload or distortion of any stage. AGC signal for "s" meter (can be calibrated to real signal strength by reference).Bad: Very complicated, impacts every RF/IF/Audio stage. Lots of mods and parts.Comment: A CW ops dream.
	* KD2NDR port to Teensy		* KD2NDR port to Teensy
			* [https://vk4pln.blogspot.com.au/2018/03/ubitx-am-bci-filter-35mhz-high-pass_31.html VK4PLN AM broadcast filter (3.5 MHz high-pass filter)]
	----		----
	'''Enclosure Ideas'''		'''Enclosure Ideas'''
	----		----
	'''ARROW Rig Showcase'''		'''ARROW Rig Showcase'''

Ab8oj at 17:14, 1 April 2018

2018-04-01T17:14:55Z

← Older revision		Revision as of 13:14, 1 April 2018
Line 29:		Line 29:
	'''Advanced Mods'''		'''Advanced Mods'''
	* AGC circuit		* AGC circuit
			** VK2ETA simple software AGC mod (see mailing list)
	** K9HZ summary of options		** K9HZ summary of options
	***... audio range passband...Benefit: saves your ears, $0.02 diode, trivially easy to implement.Bad: only protects your ears... not RF sections from excessive signal and overload. Not a true AGC signal for "s" meter, only an audio strength.Comment: Save the $0.02 diode, turn the damn volume down and live with the IF overload.		***... audio range passband...Benefit: saves your ears, $0.02 diode, trivially easy to implement.Bad: only protects your ears... not RF sections from excessive signal and overload. Not a true AGC signal for "s" meter, only an audio strength.Comment: Save the $0.02 diode, turn the damn volume down and live with the IF overload.

Ab8oj at 14:54, 31 March 2018

2018-03-31T14:54:46Z

← Older revision		Revision as of 10:54, 31 March 2018
Line 16:		Line 16:
	* Power output differences across bands		* Power output differences across bands
	** http://ubitx.net/fix-fix-uneven-tx-output-across-bands/		** http://ubitx.net/fix-fix-uneven-tx-output-across-bands/
			** The PA is reported to be quite sensitive to SWR / reflected power. Make sure to use a good dummy load for power measurement.
	----		----
	'''Building Hints and Tips'''		'''Building Hints and Tips'''

Ab8oj at 23:00, 30 March 2018

2018-03-30T23:00:26Z

← Older revision		Revision as of 19:00, 30 March 2018
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	*** Replace with 8-pin socket and NJM2073D		*** Replace with 8-pin socket and NJM2073D
	*** LM386 + adaptor		*** LM386 + adaptor
			*** Voltage regulator + capacitor (Ron's solution ... see mailing list archives)
	** <link(s) to best discussion(s), fix(es), etc(es)>		** <link(s) to best discussion(s), fix(es), etc(es)>
	* Power output differences across bands		* Power output differences across bands