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Re: boards and kits and stuff
¿ªÔÆÌåÓýThat can work! ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ ? Owner - Operator Big Signal Ranch ¨C K9ZC Staunton, Illinois ? Owner ¨C Operator Villa Grand Piton ¨C 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@... ? ? From: [email protected] <[email protected]> On Behalf Of jjpurdum via groups.io
Sent: Tuesday, March 18, 2025 8:17 PM To: [email protected] Subject: Re: [SoftwareControlledHamRadio] boards and kits and stuff ? I will have my 7" system ready in about 4 days, if that's quick enough. ? Jack, W8TEE ? On Tuesday, March 18, 2025 at 07:46:01 PM EDT, K9HZ <bill@...> wrote: ? ? Hey for those that want boards, I¡¯ll be in town for about 5 days so now it the time to order¡ ? ALSO I¡¯d like to get a couple of these display driver boards into peoples hands (yes, build and free) to see if they work.? Everyone of my 4 radios is in a different state and I don¡¯t really have the freeze-up issue¡ but I do want to fix it permanently. ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ ? Owner - Operator Big Signal Ranch ¨C K9ZC Staunton, Illinois ? Owner ¨C Operator Villa Grand Piton ¨C 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@... ? ?
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Re: boards and kits and stuff
Wait a minute, Bill: my system at the present time does not freeze up, so that might not do you any good. Jack, W8TEE
On Tuesday, March 18, 2025 at 07:46:01 PM EDT, K9HZ <bill@...> wrote:
Hey for those that want boards, I¡¯ll be in town for about 5 days so now it the time to order¡ ? ALSO I¡¯d like to get a couple of these display driver boards into peoples hands (yes, build and free) to see if they work.? Everyone of my 4 radios is in a different state and I don¡¯t really have the freeze-up issue¡ but I do want to fix it permanently. ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ ? Owner - Operator Big Signal Ranch ¨C K9ZC Staunton, Illinois ? Owner ¨C Operator Villa Grand Piton ¨C 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@... ? ? -- Jack, W8TEE |
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Re: boards and kits and stuff
I will have my 7" system ready in about 4 days, if that's quick enough. Jack, W8TEE
On Tuesday, March 18, 2025 at 07:46:01 PM EDT, K9HZ <bill@...> wrote:
Hey for those that want boards, I¡¯ll be in town for about 5 days so now it the time to order¡ ? ALSO I¡¯d like to get a couple of these display driver boards into peoples hands (yes, build and free) to see if they work.? Everyone of my 4 radios is in a different state and I don¡¯t really have the freeze-up issue¡ but I do want to fix it permanently. ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ ? Owner - Operator Big Signal Ranch ¨C K9ZC Staunton, Illinois ? Owner ¨C Operator Villa Grand Piton ¨C 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@... ? ? -- Jack, W8TEE |
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boards and kits and stuff
¿ªÔÆÌåÓýHey for those that want boards, I¡¯ll be in town for about 5 days so now it the time to order¡ ? ALSO I¡¯d like to get a couple of these display driver boards into peoples hands (yes, build and free) to see if they work.? Everyone of my 4 radios is in a different state and I don¡¯t really have the freeze-up issue¡ but I do want to fix it permanently. ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ ? Owner - Operator Big Signal Ranch ¨C K9ZC Staunton, Illinois ? Owner ¨C Operator Villa Grand Piton ¨C 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@... ? ? |
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Re: Tiny Ten Transceiver
¿ªÔÆÌåÓýWell¡ 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¡ ?
? 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 ¨C K9ZC Staunton, Illinois ? Owner ¨C Operator Villa Grand Piton ¨C 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@... ? ? 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 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 |
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Re: T41 V66.4 with Code Revisions
¿ªÔÆÌåÓýSomething is wrong. ?The hardware is set up to select 17M and 10M differently. ? The truth table in in the design note directory, the I2C addresses document, the LPF tab. ?Dr.?William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ ? Owner - Operator Big Signal Ranch ¨C K9ZC Staunton, Illinois ? Owner ¨C Operator Villa Grand Piton - J68HZ Soufriere, St. Lucia W.I. Rent it: www.VillaGrandPiton.com email:??bill@... ? On Mar 17, 2025, at 3:01?PM, Tim via groups.io <w4yn@...> wrote:
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Re: T41 partially thawed
¿ªÔÆÌåÓýJerry, do you have the part numbers for the regulators that you
used? On 3/17/2025 1:38 PM, jerry-KF6VB via
groups.io wrote:
On 2025-03-17 09:25, Kees Mos via groups.io wrote: --
73
Bob W3RDL |
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Re: T41 Announcement from PJRC
¿ªÔÆÌåÓýYeah i wonder how that will go¡ particularly the price curve. ?Although the customs forms for CA were always a problem for shipping and that wont be a problem any longer. ?Dr.?William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ ? Owner - Operator Big Signal Ranch ¨C K9ZC Staunton, Illinois ? Owner ¨C Operator Villa Grand Piton - J68HZ Soufriere, St. Lucia W.I. Rent it: www.VillaGrandPiton.com email:??bill@... ? On Mar 17, 2025, at 3:30?PM, Greg KF5N via groups.io <greg.electricity@...> wrote:
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Re: T41 V66.4 with Code Revisions
You can check the software to ensure that it didn't get messed up somehow. In BPF_Control.h, make sure that the definitions of the control words for those bands are OK: #define BPF_BAND_10M ? ?0x0002 #define BPF_BAND_17M ? ?0x4000 Then, in BPF_Control.cpp, make sure that setBPFBand applies those control words: ? ? case BAND_17M: ? ? ? BPF_GPAB_state = BPF_BAND_17M; ? ? ? break; ? ? ... ? ? case BAND_10M: ? ? ? BPF_GPAB_state = BPF_BAND_10M;????? break; Finally, check that your definition of the bands structure in the ino file hasn't got messed up. Look for the bit that starts with this line: struct band bands[NUMBER_OF_BANDS] = If all those are correct, then the problem is in hardware. I'd look for a solder short somewhere in this part of the board: The anode of D1 should go high when the 17m band is selected -- all other diode anodes should be low. The anode of D4 should go high when the 10m band is selected.
On Monday, March 17th, 2025 at 4:01 PM, Tim via groups.io <w4yn@...> wrote:
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Re: T41 partially thawed
¿ªÔÆÌåÓýJerry, I plan on building a new Main board with the regulators
and heatsinks on the rear of the board so any heat from them
doesn't go directly to the Teensy. I may try the switchers. My
temp - ~42C in an air-conditioned room, would like more margin if
used outdoors. On 3/17/2025 1:38 PM, jerry-KF6VB via
groups.io wrote:
On 2025-03-17 09:25, Kees Mos via groups.io wrote: --
73
Bob W3RDL |
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Re: T41 partially thawed
¿ªÔÆÌåÓýKees, thanks for the input. I have a 40mm Noctua fan for the Teensy and a 30mm fan mounted on the heatsinks. Temp runs 41.9C to 42.5C. I noticed that you're running at 46.4C. I'm not sure that temperature is a major factor since I could previously run all versions up to 66.7. Now most versions only run at 600MHz. I think I still have a library problem so I'll probably do a clean (delete) rebuild of the IDE and libraries.On 3/17/2025 12:25 PM, Kees Mos via
groups.io wrote:
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73
Bob W3RDL |
K9HZ
jjpurdum
