2m-avr-superhet - Revision history

N8vi at 13:06, 26 August 2012

2012-08-26T13:06:30Z

N8vi: /* First LO Connection to First Mixer */

2012-07-04T05:09:58Z

First LO Connection to First Mixer

N8vi: /* First LO Connection to First Mixer */

2012-07-04T05:09:26Z

First LO Connection to First Mixer

N8vi: /* Project was on hold */

2012-07-04T05:00:29Z

Project was on hold

N8vi: /* Project [i]was[/i] on hold */

2012-07-04T04:59:43Z

Project [i]was[/i] on hold

N8vi at 04:58, 4 July 2012

2012-07-04T04:58:28Z

Cmounts: /* Alternate Design */

2012-06-24T16:51:28Z

Alternate Design

N8vi: /* Project on hold */

2012-05-10T06:41:32Z

Project on hold

N8vi: /* Project on hold */

2012-05-10T06:40:32Z

Project on hold

N8vi: /* Project on hold */

2012-05-10T06:39:35Z

Project on hold

@@ Line 1: / Line 1: @@
 = n8vi's AVR-tuned 2-meter double-conversion superhet project  =
-=== Project ''was'' on hold ===
+=== Project ''back'' on hold ===
 Project was on hold as I tried to increase my knowledge to understand what I'm doing.  I took the MITX online electronics course, 6002x (http://6002x.mitx.mit.edu), which took 100% of my free time.  I couldn't recommend it more.
-The class completed a couple of weeks ago, and I'm starting to think again about how to get this project moving forward.  I think I'm going to be looking again at the coupling between the LO and first mixer now that I have a better idea of what other people are doing: '''lowpass filter followed by buffer amplifier'''.  Also, some time before the end of this week (happy July 4th) I'm going to be going through this whole page and cleaning it up as I rule out things I ''won't'' be doing.
+The class completed a couple of weeks ago, and I started thinking again about how to get this project moving forward.  I think I'm going to be looking again at the coupling between the LO and first mixer now that I have a better idea of what other people are doing: '''lowpass filter followed by buffer amplifier'''.
 I may do a subproject to test my understanding: a direct-conversion HF receiver of some sort.  This will allow me to test out some of the design ideas without the additional variables of VHF.
 If you see any glaring stupid in this design, please let me know.  It's my first RF circuit.  Hell, it's really my first analog circuit.
@@ Line 199: / Line 201: @@
 So the basic upshot of this is that adding a fixed frequency downconverter up front doesn't allow for me to remove a stage.  I still have to have a double conversion superhet after that.  So, for now, I think I'll be focusing on the superhet without the downconverter in front.
-[[Category:Projects]][[Category:Member Projects]]
+[[Category:Projects]][[Category:Member Projects]][[Category:Inactive Projects]]

@@ Line 54: / Line 54: @@
 Oh look, he's using a board with an HF filter on it, not a bare DDS.  THIS PART NEEDS ATTENTION, IT'S WRONG.  This may be a good time to redesign with a lower frequency cheaper DDS and an SA602-based frequency multiplier.
-Something to read: [www.g4jnt.com/144MHzDCReceiver.pdf www.g4jnt.com/144MHzDCReceiver.pdf]
+Something to read: [http://www.g4jnt.com/144MHzDCReceiver.pdf http://www.g4jnt.com/144MHzDCReceiver.pdf]
 ==== Front End Filter and First Mixer (SA602) ====

← Older revision		Revision as of 05:09, 4 July 2012
Line 53:		Line 53:

	Oh look, he's using a board with an HF filter on it, not a bare DDS. THIS PART NEEDS ATTENTION, IT'S WRONG. This may be a good time to redesign with a lower frequency cheaper DDS and an SA602-based frequency multiplier.		Oh look, he's using a board with an HF filter on it, not a bare DDS. THIS PART NEEDS ATTENTION, IT'S WRONG. This may be a good time to redesign with a lower frequency cheaper DDS and an SA602-based frequency multiplier.
		+
		+	Something to read: [www.g4jnt.com/144MHzDCReceiver.pdf www.g4jnt.com/144MHzDCReceiver.pdf]

	==== Front End Filter and First Mixer (SA602) ====		==== Front End Filter and First Mixer (SA602) ====

@@ Line 4: / Line 4: @@
 Project was on hold as I tried to increase my knowledge to understand what I'm doing.  I took the MITX online electronics course, 6002x (http://6002x.mitx.mit.edu), which took 100% of my free time.  I couldn't recommend it more.
-The class completed a couple of weeks ago, and I'm starting to think again about how to get this project moving forward.  I think I'm going to be looking again at the coupling between the LO and first mixer now that I have a better idea of what other people are doing: lowpass filter followed by buffer amplifier.  Also, some time before the end of this week (happy July 4th) I'm going to be going through this whole page and cleaning it up as I rule out things I ''won't'' be doing.
+The class completed a couple of weeks ago, and I'm starting to think again about how to get this project moving forward.  I think I'm going to be looking again at the coupling between the LO and first mixer now that I have a better idea of what other people are doing: '''lowpass filter followed by buffer amplifier'''.  Also, some time before the end of this week (happy July 4th) I'm going to be going through this whole page and cleaning it up as I rule out things I ''won't'' be doing.
 I may do a subproject to test my understanding: a direct-conversion HF receiver of some sort.  This will allow me to test out some of the design ideas without the additional variables of VHF.

@@ Line 1: / Line 1: @@
 = n8vi's AVR-tuned 2-meter double-conversion superhet project  =
-=== Project [i]was[/i] on hold ===
+=== Project ''was'' on hold ===
 Project was on hold as I tried to increase my knowledge to understand what I'm doing.  I took the MITX online electronics course, 6002x (http://6002x.mitx.mit.edu), which took 100% of my free time.  I couldn't recommend it more.
-The class completed a couple of weeks ago, and I'm starting to think again about how to get this project moving forward.  I think I'm going to be looking again at the coupling between the LO and first mixer now that I have a better idea of what other people are doing: lowpass filter followed by buffer amplifier.  Also, some time before the end of this week (happy July 4th) I'm going to be going through this whole page and cleaning it up as I rule out things I [i]won't[/i] be doing.
+The class completed a couple of weeks ago, and I'm starting to think again about how to get this project moving forward.  I think I'm going to be looking again at the coupling between the LO and first mixer now that I have a better idea of what other people are doing: lowpass filter followed by buffer amplifier.  Also, some time before the end of this week (happy July 4th) I'm going to be going through this whole page and cleaning it up as I rule out things I ''won't'' be doing.
 I may do a subproject to test my understanding: a direct-conversion HF receiver of some sort.  This will allow me to test out some of the design ideas without the additional variables of VHF.

← Older revision		Revision as of 16:51, 24 June 2012
Line 193:		Line 193:

	So the basic upshot of this is that adding a fixed frequency downconverter up front doesn't allow for me to remove a stage. I still have to have a double conversion superhet after that. So, for now, I think I'll be focusing on the superhet without the downconverter in front.		So the basic upshot of this is that adding a fixed frequency downconverter up front doesn't allow for me to remove a stage. I still have to have a double conversion superhet after that. So, for now, I think I'll be focusing on the superhet without the downconverter in front.
		+	[[Category:Projects]][[Category:Member Projects]][[Category:Inactive Projects]]

@@ Line 2: / Line 2: @@
 === Project on hold ===
-Project presently on hold as I try to increase my knowledge to understand what I'm doing.  Presently I'm taking the MITX online electronics course, 6002x (http://6002x.mitx.mit.edu).
+Project presently on hold as I try to increase my knowledge to understand what I'm doing.  Presently I'm taking the MITX online electronics course, 6002x (http://6002x.mitx.mit.edu).  This is taking 100% of my free time.  I couldn't recommend it more.
 If you see any glaring stupid in this design, please let me know.  It's my first RF circuit.  Hell, it's really my first analog circuit.