tag:blogger.com,1999:blog-7819684856383893520.post4104022508732121020..comments2023-06-05T04:38:27.414-07:00Comments on Charlie Morris, ZL2CTM: Homebrew SSB SDR RigCharlie Morris, ZL2CTMhttp://www.blogger.com/profile/02642502413959463906noreply@blogger.comBlogger36125tag:blogger.com,1999:blog-7819684856383893520.post-8464300953073373242021-01-13T21:43:10.908-08:002021-01-13T21:43:10.908-08:00That's great Rudy.That's great Rudy.Charlie Morris, ZL2CTMhttps://www.blogger.com/profile/02642502413959463906noreply@blogger.comtag:blogger.com,1999:blog-7819684856383893520.post-60983202348926085772021-01-13T21:37:01.939-08:002021-01-13T21:37:01.939-08:00Hi Charlie , thanks for the explanation in video a...Hi Charlie , thanks for the explanation in video and this blog , i just learn SDR , i hope i can practice it , i will tell you if i done to made it ,<br /><br />Rudy<br />de YG3DBORudyhttps://www.blogger.com/profile/05705662873743262753noreply@blogger.comtag:blogger.com,1999:blog-7819684856383893520.post-79598723258234074742021-01-13T21:35:17.339-08:002021-01-13T21:35:17.339-08:00This comment has been removed by the author.Rudyhttps://www.blogger.com/profile/05705662873743262753noreply@blogger.comtag:blogger.com,1999:blog-7819684856383893520.post-36511534012370916732020-06-28T10:09:18.282-07:002020-06-28T10:09:18.282-07:00Hi Joe. Drop me a line on the QRZ address if you c...Hi Joe. Drop me a line on the QRZ address if you can.<br />Charlie ZL2CTMCharlie Morris, ZL2CTMhttps://www.blogger.com/profile/02642502413959463906noreply@blogger.comtag:blogger.com,1999:blog-7819684856383893520.post-75708002946204855152020-06-28T07:21:36.846-07:002020-06-28T07:21:36.846-07:00Charlie
I'm trying to learn how to design filt...Charlie<br />I'm trying to learn how to design filters for the PJRC audio library. Specifically, I'm trying to precisely derive your results designing the Hilbert filter(s) with the Iowa Hills Software. Can you explain:<br /><br />1 The Hilbert filter type you used ("phase offset" I assume)<br />2 The full set of input parameters<br />3 How you converted the coefficients into an array of C Shorts.<br /><br />ThanKS<br />Joe<br />W3JDRW3JDRhttps://www.blogger.com/profile/04773514306018654594noreply@blogger.comtag:blogger.com,1999:blog-7819684856383893520.post-2801552859630447272020-05-22T12:39:12.056-07:002020-05-22T12:39:12.056-07:00Hi Ashok. You shouldn't have any problems at a...Hi Ashok. You shouldn't have any problems at all. You might be able to do some more DSP with the extra CPU cycles. I should order one at some stage.Charlie Morris, ZL2CTMhttps://www.blogger.com/profile/02642502413959463906noreply@blogger.comtag:blogger.com,1999:blog-7819684856383893520.post-30924850873292239412020-05-22T05:26:02.195-07:002020-05-22T05:26:02.195-07:00Hi Charlie, I am thinking of using the new and mor...Hi Charlie, I am thinking of using the new and more powerful version 4 of Teensy along with the new audio shield made for it. Do you see an downside of doing so please. Thanks. Ashok VU2ASBAnonymoushttps://www.blogger.com/profile/02623301886250164360noreply@blogger.comtag:blogger.com,1999:blog-7819684856383893520.post-85554778454687713262020-05-19T02:31:36.241-07:002020-05-19T02:31:36.241-07:00Thanks Charlie, shall let you know if I discover s...Thanks Charlie, shall let you know if I discover something. 73s AshokAnonymoushttps://www.blogger.com/profile/02623301886250164360noreply@blogger.comtag:blogger.com,1999:blog-7819684856383893520.post-73217489280232585342020-05-18T11:26:46.935-07:002020-05-18T11:26:46.935-07:00Sorry Ashok. I am not aware of any toroid use. I&#...Sorry Ashok. I am not aware of any toroid use. I'd say it would be impractical as you'd need mH of inductance.Charlie Morris, ZL2CTMhttps://www.blogger.com/profile/02642502413959463906noreply@blogger.comtag:blogger.com,1999:blog-7819684856383893520.post-73761933481290040792020-05-18T10:57:38.117-07:002020-05-18T10:57:38.117-07:00Not sure sorry Ashok. Try the Teensy website I kno...Not sure sorry Ashok. Try the Teensy website I know there is a vibrant community.Charlie Morris, ZL2CTMhttps://www.blogger.com/profile/02642502413959463906noreply@blogger.comtag:blogger.com,1999:blog-7819684856383893520.post-72769054573692377572020-05-18T09:31:45.992-07:002020-05-18T09:31:45.992-07:00Hello Charlie, Has anyone explored using the teens...Hello Charlie, Has anyone explored using the teensy audio module for audio compression please? Thanks. DE VU2ASB Ashok Anonymoushttps://www.blogger.com/profile/02623301886250164360noreply@blogger.comtag:blogger.com,1999:blog-7819684856383893520.post-33701241908905211582020-05-17T09:53:00.572-07:002020-05-17T09:53:00.572-07:00Hello Charlie, thanks a lot for taking the effort ...Hello Charlie, thanks a lot for taking the effort and time to document and publish so many excellent projects. I was reading about your use of 100E to 1000E audio isolation transformers. There was a time these were abundantly available here but not anymore. Has anyone used toroids instead iron core EI type transformer please. Any guidance will be appreciated. Thanks again, Ashok VU2ASB Anonymoushttps://www.blogger.com/profile/02623301886250164360noreply@blogger.comtag:blogger.com,1999:blog-7819684856383893520.post-78280533249853613032020-02-08T23:33:45.884-08:002020-02-08T23:33:45.884-08:00Hi Andy. Yes you are right. I have updated the blo...Hi Andy. Yes you are right. I have updated the blog. Pin 5 for NE612 audio. Pin 6 and 9 is for the I and Q drive from the flip flops.Charlie Morris, ZL2CTMhttps://www.blogger.com/profile/02642502413959463906noreply@blogger.comtag:blogger.com,1999:blog-7819684856383893520.post-56048595463270839002020-02-07T13:28:58.478-08:002020-02-07T13:28:58.478-08:00Hi Charlie,
Stumbled upon your videos. I've ...Hi Charlie,<br /><br />Stumbled upon your videos. I've worked through #3 and am moving forward. Very well done. Have a question on your AF amp circuit schematic. You have put pins 6 and 9 as outputs on the NE612's for the Rx audio. Wondering if that's a typo? I thought it would be pin 5 for both of the NE612's based on listening to video #3?<br /><br />Thanks,<br /><br />Andy ...Anonymoushttps://www.blogger.com/profile/12397351320515447350noreply@blogger.comtag:blogger.com,1999:blog-7819684856383893520.post-52610256840761083592019-11-12T19:13:29.819-08:002019-11-12T19:13:29.819-08:00This comment has been removed by the author.W0CHLhttps://www.blogger.com/profile/06647648898375115308noreply@blogger.comtag:blogger.com,1999:blog-7819684856383893520.post-7803300882323806202019-11-01T15:25:17.245-07:002019-11-01T15:25:17.245-07:00Yes. It's in the 80/40/20 SDR rig post.Yes. It's in the 80/40/20 SDR rig post.Charlie Morris, ZL2CTMhttps://www.blogger.com/profile/02642502413959463906noreply@blogger.comtag:blogger.com,1999:blog-7819684856383893520.post-6315038354248496182019-10-12T17:19:08.740-07:002019-10-12T17:19:08.740-07:00Did you ever post the transceiver code?Did you ever post the transceiver code?WA2MZEhttps://www.blogger.com/profile/09367252803591338065noreply@blogger.comtag:blogger.com,1999:blog-7819684856383893520.post-18734189055793336432019-10-12T08:45:44.211-07:002019-10-12T08:45:44.211-07:00Re-watching these videos and re-reading the blog. ...Re-watching these videos and re-reading the blog. I've ordered the Teensy4 version of the Teensy audio board to go with the Teensy4 I recently received. I have the Teensy 3 version of the audio board, but its pinout doesn't match the Teensy 4. This new more powerful Teensy should work out great with an SDR rig. WA2MZEhttps://www.blogger.com/profile/09367252803591338065noreply@blogger.comtag:blogger.com,1999:blog-7819684856383893520.post-56820274473343530412019-04-30T02:33:19.738-07:002019-04-30T02:33:19.738-07:00Nice report on IQ demod and importance of IQ level...Nice report on IQ demod and importance of IQ level/phase accuracy. I can now achieve >40dB image reject...<br />https://www.microwavejournal.com/ext/resources/pdf-downloads/IQTheory-of-Operation.pdf?1336590796<br /><br />Robrobjohnbhttps://www.blogger.com/profile/10106238820087595097noreply@blogger.comtag:blogger.com,1999:blog-7819684856383893520.post-8398717048997603232019-04-27T13:23:08.420-07:002019-04-27T13:23:08.420-07:00Thanks Rob. It was certainly interesting to try th...Thanks Rob. It was certainly interesting to try the Teensy audio library and see what could be done. Thanks again. Charlie Charlie Morris, ZL2CTMhttps://www.blogger.com/profile/02642502413959463906noreply@blogger.comtag:blogger.com,1999:blog-7819684856383893520.post-53718038843900412202019-04-27T04:10:31.619-07:002019-04-27T04:10:31.619-07:00Hi Charlie, ok, I'll look.
Just roughly put to...Hi Charlie, ok, I'll look.<br />Just roughly put together an SSB Rx using the teensy3.6/AD9850 DDS/SRA-6 mixers/74HC74 I,Q/J310 front-end + BPF's. It does demod but image looks about 10dB down. I read that I/Q phase and level need trimming to null out image and can be done within the teensy. So far all looks promising. Cheers, RobRob Bhttps://www.blogger.com/profile/04854995294456510427noreply@blogger.comtag:blogger.com,1999:blog-7819684856383893520.post-87757282779592315022019-04-26T17:04:19.540-07:002019-04-26T17:04:19.540-07:00Hi Rob. I'm not too sure on that as I didn'...Hi Rob. I'm not too sure on that as I didn't do any specific tests. When I changed the tx to the other SB the rx didn't detect it. If I recall Pete Juliano N6QW built it and did some tests. Try his blog. Sorry about that.Charlie Morris, ZL2CTMhttps://www.blogger.com/profile/02642502413959463906noreply@blogger.comtag:blogger.com,1999:blog-7819684856383893520.post-88324437219515078402019-04-26T15:29:00.945-07:002019-04-26T15:29:00.945-07:00Very helpful website and video's. A question o...Very helpful website and video's. A question on your teensy SSB demod Rx above. How much image rejection do you achieve? Cheers, RobRob Bhttps://www.blogger.com/profile/04854995294456510427noreply@blogger.comtag:blogger.com,1999:blog-7819684856383893520.post-37555965813619461942019-02-11T09:51:09.447-08:002019-02-11T09:51:09.447-08:00P.S. I watch all your videos and appreciate the wo...P.S. I watch all your videos and appreciate the work that goes into them. I like the design explanations a lot!Anonymoushttps://www.blogger.com/profile/09902683181015684293noreply@blogger.comtag:blogger.com,1999:blog-7819684856383893520.post-67445812718068714852019-02-11T09:47:59.693-08:002019-02-11T09:47:59.693-08:00Maybe it won't be a Flex replacement but I hav...Maybe it won't be a Flex replacement but I have built radios that SOUND => commercial radios just by paying slight attention to the audio amp. You can get board with any radio except the ones you build yourself :) Anonymoushttps://www.blogger.com/profile/09902683181015684293noreply@blogger.com