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Tiny Ten Transceiver

Bob Larkin All Messages By This Member #32342 Hi Group!?? Maybe you need a few minutes break from the fun of the T41, so let me mention that I put together a SDR TRansceiver using the Teensy 4.1 and associated libraries.? It is not intended as a big radio like is talked about here with all the home station stuff, but rather is a carry around, less than 1-lb radio.? The whole story is summarized at Enjoy!? 73, Bob? W7PUA
Greg KF5N All Messages By This Member #32346 Hi Bob, I'm very interested in your transmitter chain, as I struggled to get the Compressor 2 to work.? I will drill into your code and see if I can figure out what I was missing. A very cool project, and thank you for sharing it here. ? -- 73 Greg KF5N
Allen Hill All Messages By This Member #32348 开云体育 Hi Bob, a very impressive project. I echo Greg, thank you for sharing. KI4QCK toggle quoted message Show quoted text On Jan 19, 2025, at 5:15?PM, Greg KF5N via groups.io <greg.electricity@...> wrote: ? Hi Bob, I'm very interested in your transmitter chain, as I struggled to get the Compressor 2 to work.? I will drill into your code and see if I can figure out what I was missing. A very cool project, and thank you for sharing it here. ? -- 73 Greg KF5N
John KC9OJV All Messages By This Member #32349 Wow Bob, That's quite a project for what started as modest goals. I'd be anxious to tackle building that when and if you publish details. It looks like a fun project.? Best Regards, John Greusel KC9OJV On Sunday, January 19, 2025 at 02:08:57 PM CST, Bob Larkin <bob@...> wrote: Hi Group!?? Maybe you need a few minutes break from the fun of the T41, so let me mention that I put together a SDR TRansceiver using the Teensy 4.1 and associated libraries.? It is not intended as a big radio like is talked about here with all the home station stuff, but rather is a carry around, less than 1-lb radio.? The whole story is summarized at Enjoy!? 73, Bob? W7PUA
jjpurdum Member Profile All Messages By This Member #32350 Very nice, Bob. Keep us posted! Jack, W8TEE On Sunday, January 19, 2025 at 03:08:55 PM EST, Bob Larkin <bob@...> wrote: Hi Group!?? Maybe you need a few minutes break from the fun of the T41, so let me mention that I put together a SDR TRansceiver using the Teensy 4.1 and associated libraries.? It is not intended as a big radio like is talked about here with all the home station stuff, but rather is a carry around, less than 1-lb radio.? The whole story is summarized at Enjoy!? 73, Bob? W7PUA -- Jack, W8TEE
Bob Larkin All Messages By This Member #32531 Many thanks for the comments , here and separately.? That is most helpful for me. ? Additional note:? I have posted stuff about the RF design, including the three plug-in networks.? It is about half-way down in under "Tuned Circuits."? This includes schematics and layouts for the three plug-in networks.? ? More testing is going on and I will get that up as I can. ? 73, Bob? W7PUA
Bob Larkin All Messages By This Member #32891 Hello All - I? feel that I have learned a lot by reading posts here on the T41 adventure.? Thanks much.? In exchange, a heads up that I added more detail to the Tiny Ten page.? This is a different radio with different goals, but there is a lot of common heritage and it borrows, with appreciation, from many projects including the T41. ? In part, since last time, * 10-meter output is measuring 12 ?Watts * I-Q vector errors and SSB suppression have been measured * As a novelty, an AM broadcast input filter was added * TwinPeaks I-Q alignment had been left out, it is there now * Updated schematics for both Digital & RF PCB * The output match/filter now has two ground paths. It is better. In general, the radio is now able to do the basic functions that were planned. ?I plan to do software improvements as there is time, but nothing is urgent. As usual, the page is at https://www.janbob.com/electron/TinyTen/TinyTen.htm and comments and discussion are welcomed. 73, Bob ?W7PUA
jjpurdum Member Profile All Messages By This Member #32892 Nice, Bob! Jack, W8TEE On Sunday, February 23, 2025 at 02:28:04 PM EST, Bob Larkin <bob@...> wrote: Hello All - I? feel that I have learned a lot by reading posts here on the T41 adventure.? Thanks much.? In exchange, a heads up that I added more detail to the Tiny Ten page.? This is a different radio with different goals, but there is a lot of common heritage and it borrows, with appreciation, from many projects including the T41. ? In part, since last time, * 10-meter output is measuring 12 ?Watts * I-Q vector errors and SSB suppression have been measured * As a novelty, an AM broadcast input filter was added * TwinPeaks I-Q alignment had been left out, it is there now * Updated schematics for both Digital & RF PCB * The output match/filter now has two ground paths. It is better. In general, the radio is now able to do the basic functions that were planned. ?I plan to do software improvements as there is time, but nothing is urgent. As usual, the page is at https://www.janbob.com/electron/TinyTen/TinyTen.htm and comments and discussion are welcomed. 73, Bob ?W7PUA -- Jack, W8TEE
Doug W All Messages By This Member #32917 On Sun, Jan 19, 2025 at 02:08 PM, Bob Larkin wrote: Hi Group!?? Maybe you need a few minutes break from the fun of the T41, so let me mention that I put together a SDR TRansceiver using the Teensy 4.1 and associated libraries.? ------------------------------ Thanks for sharing Bob.? Please do keep up updated.
Bob Larkin All Messages By This Member #33090 This is another update on my Tiny Ten transceiver, and particularly one trying to understand noise figure issues with the receiver side. ?I have done noise figure and distortion measurements and posted data. See http://www.janbob.com/electron/TinyTen/TinyTen.htm down near the bottom at, "Dynamic Range, Noise Figure and Distortion" and at, "Noise Figure of the Mixer Alone." This receiver circuit is closely related to that of the T41 and other QSD projects, so maybe there is other noise figure data around to compare with?? I'm still hunting for the source of about 10 dB of extra noise! ? Any thoughts on this? ? Thanks, and 73, Bob? W7PUA
K9HZ All Messages By This Member #33091 开云体育 Well… Noise.? Here are some things Oliver and I did with the T41 RF board to make the sensitivity and noise figure spectacular for the T41… ? 4 layer board with V+ bus and GND inside to shield the layers.? Use software to work Impedance.? Isolate LO lines. Bypass the CRAP out of the power bus… plenty of chokes. I found some extremely low noise instrument amps for the Salen filters and followers… at least 10 db better than what most used.? Keeps the s/n very low. Very low noise front-end RF amplifier and very low gain (it could be increased if needed).? Gain could be increased by 10-15db if wanted. ? What else could be done?? Most noise after that from above comes in through the A/D and D/A’s.? If I were going to upgrade the anything in this area… two things come to mind.? Higher performance A/D and D/A parts (but they will be a lot more expensive LTC2217 etc.)… and much lower noise power regulators to use with the A/D and D/A’s (which is where most of the noise comes from since the signal gets referenced to an internal ref voltage or the original Vcc).? I would use the Linear LT3040, LTC3045, etc. where the PSSR is better than the existing noise level.? These things are at least 30 db better than those Murata devices discussed here… and maybe 20 db better than a standard LDO linear regulator. ? I looked for a better mixer but there are very few parts as good as the 3253. ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ ? Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois ? Owner – Operator Villa Grand Piton – J68HZ Soufriere, St. Lucia W.I. Rent it: ? Moderator: North American QRO Group at Groups.IO. Moderator: Amateur Radio Builders Group at Groups.IO. ? email:? bill@... ? ? toggle quoted message Show quoted text From: [email protected] <[email protected]> On Behalf Of Bob Larkin Sent: Tuesday, March 18, 2025 4:14 PM To: [email protected] Subject: Re: [SoftwareControlledHamRadio] Tiny Ten Transceiver ? This is another update on my Tiny Ten transceiver, and particularly one trying to understand noise figure issues with the receiver side. ?I have done noise figure and distortion measurements and posted data. See down near the bottom at, "Dynamic Range, Noise Figure and Distortion" and at, "Noise Figure of the Mixer Alone." This receiver circuit is closely related to that of the T41 and other QSD projects, so maybe there is other noise figure data around to compare with?? I'm still hunting for the source of about 10 dB of extra noise! ? Any thoughts on this? ? Thanks, and 73, Bob? W7PUA
Bob Larkin All Messages By This Member #33153 Thank you much for the comments.? This is all most useful in understanding the operation and limitations of QSD/Tayloe receivers. ? I went back and spent some time with theT41 schematics.? Q: Do you have noise measurements of the T41 circuitry without the U2 RF amplifier??? This is where I am running into problems.? If I read the schematic correctly, this puts 30+ dB of gain right ahead of the QSD?? That would cover noise issues, and thus the question. ? Don't do anything special if you don't have data.? I will continue with Tiny Ten measurements and post those. ? 73, Bob? W7PUA
K9HZ All Messages By This Member #33159 开云体育 “this puts 30+ dB of gain right ahead of the QSD?”? no no no… its operating at a voltage that provides much less gain…? ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ ? Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois ? Owner – Operator Villa Grand Piton – J68HZ Soufriere, St. Lucia W.I. Rent it: ? Moderator: North American QRO Group at Groups.IO. Moderator: Amateur Radio Builders Group at Groups.IO. ? email:? bill@... ? ? toggle quoted message Show quoted text From: [email protected] <[email protected]> On Behalf Of Bob Larkin Sent: Friday, March 21, 2025 1:30 PM To: [email protected] Subject: Re: [SoftwareControlledHamRadio] Tiny Ten Transceiver ? Thank you much for the comments.? This is all most useful in understanding the operation and limitations of QSD/Tayloe receivers. ? I went back and spent some time with theT41 schematics.? Q: Do you have noise measurements of the T41 circuitry without the U2 RF amplifier??? This is where I am running into problems.? If I read the schematic correctly, this puts 30+ dB of gain right ahead of the QSD?? That would cover noise issues, and thus the question. ? Don't do anything special if you don't have data.? I will continue with Tiny Ten measurements and post those. ? 73, Bob? W7PUA
Bob Larkin All Messages By This Member #33161 The DC operating point would seem to be that of Fig 1 of the data sheet for the PSA-8A+.? But that is fine, either way.? I was hoping to get some data on noise level data of other implementations of the QSD without any RF amplifier to see if I am fighting a general problem or something I created.?? Any sort of noise level vs frequency or S/N or MDS or that sort of data without the RF amp, if available would be helpful.?? Many thanks, Bob
K9HZ All Messages By This Member #33162 开云体育 I have some but its stashed away in the office I’m moving…? and of course, I just had a colonoscopy 4 hours ago… so will find it in a few days.? What I know is that we are at the limits of the followers, filters, the LO, the RF Amp.? If there is a better part for the mixer, I’m all ears… ? Check out the schematics for the Elecraft KX3… I got a few hints from that… ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ ? Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois ? Owner – Operator Villa Grand Piton – J68HZ Soufriere, St. Lucia W.I. Rent it: ? Moderator: North American QRO Group at Groups.IO. Moderator: Amateur Radio Builders Group at Groups.IO. ? email:? bill@... ? ? toggle quoted message Show quoted text From: [email protected] <[email protected]> On Behalf Of Bob Larkin Sent: Friday, March 21, 2025 5:54 PM To: [email protected] Subject: Re: [SoftwareControlledHamRadio] Tiny Ten Transceiver ? The DC operating point would seem to be that of Fig 1 of the data sheet for the PSA-8A+.? But that is fine, either way.? I was hoping to get some data on noise level data of other implementations of the QSD without any RF amplifier to see if I am fighting a general problem or something I created.?? Any sort of noise level vs frequency or S/N or MDS or that sort of data without the RF amp, if available would be helpful.?? Many thanks, Bob

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