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Re: Radiated EMI from displays
If you make one for the 7" display, put me down for one. Jack, W8TEE
On Tuesday, April 8, 2025 at 01:58:13 PM EDT, K9HZ <bill@...> wrote:
I finally got my 4-axis CNC machine fired up last night and the first thing it made was a box for the back of my radio with a 5¡± display based on John Lundberg¡¯s work.? I¡¯m pretty excited about this even though it turned out to be a disaster (idiot G-coder me)¡ but it was a step forward.? I have buckets full of scrap PCB to work from to work with to get this right¡ ?but my rather crude test measurements confirm Terrance¡¯s assertion that it is, indeed, worth about 20 db noise floor reduction on the upper bands to placing the entire display into a shielded box. ? I have a young hot-shot engineer that started working for my engineering consulting company this week¡ and I think I will put him on this project¡ to get him up to speed with our lab.? I¡¯d rather work on the 100W amp getting those kitted and finalize the Auto Tuner.? [BTW, anyone want to work along with us to see how that project comes together? I¡¯ll start a #Tuner thread for it]. ? ? 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 Terrance Robertson, KN6ZDE via groups.io
Sent: Thursday, March 27, 2025 5:11 PM To: [email protected] Subject: Re: [SoftwareControlledHamRadio] Radiated EMI from displays ? Another way to test this is to disconnect the display altogether.? This can't be done with the existing software as the code will hang trying to start the RA8875 object.? However, in developing the T41 Beacon Monitor, I created a version of the T41 software that doesn't update the display, though the RA8875 object was still there to display the Beacon Monitor.? With a bit of work, I separated that portion of the display code as well.? I can now completely disconnect the display.? It's not too hard to print the S-meter value to the serial monitor, but controlling the radio without a display is a bit of a guess.? That's where my comes in handy.? With that I see a 10 to 20 dB reduction in the noise floor on the upper bands of the 4SQRP without its 5" display.? This seems consistent with the results that John posted. ? I need to repeat this with my v12. ?? -- Jack, W8TEE |
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Re: T41 V9 troubleshooting guide
Check with Al, but I think that was the number we used on the first batch of boards we produced for the Beta T41
On Tuesday, April 8, 2025 at 02:05:48 PM EDT, K9HZ <bill@...> wrote:
Huh well then what is a V9? ? ? 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, April 8, 2025 12:39 PM To: [email protected] Subject: Re: [SoftwareControlledHamRadio] T41 V9 troubleshooting guide ? I don't think so. That was V10. ? Jack, W8TEE ? On Tuesday, April 8, 2025 at 01:31:10 PM EDT, K9HZ <bill@...> wrote: ? ? Version 9?? Not familiar with that¡? Maybe that was a 4SQRP radio? ? ? 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 Duane B via groups.io ? A co-worker purchased a V9 T41, but its not completely operational.? I know this is a few revs back, but is there a (per board) check out/troubleshooting guide somewhere for that rev??? Something with test point voltages? ? Thanks. ? Duane - K5CA
-- Jack, W8TEE |
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Re: T41 V9 troubleshooting guide
¿ªÔÆÌåÓýHuh well then what is a V9? ? ? 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, April 8, 2025 12:39 PM To: [email protected] Subject: Re: [SoftwareControlledHamRadio] T41 V9 troubleshooting guide ? I don't think so. That was V10. ? Jack, W8TEE ? On Tuesday, April 8, 2025 at 01:31:10 PM EDT, K9HZ <bill@...> wrote: ? ? Version 9?? Not familiar with that¡? Maybe that was a 4SQRP radio? ? ? 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 Duane B via groups.io ? A co-worker purchased a V9 T41, but its not completely operational.? I know this is a few revs back, but is there a (per board) check out/troubleshooting guide somewhere for that rev??? Something with test point voltages? ? Thanks. ? Duane - K5CA
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Re: Radiated EMI from displays
¿ªÔÆÌåÓýI finally got my 4-axis CNC machine fired up last night and the first thing it made was a box for the back of my radio with a 5¡± display based on John Lundberg¡¯s work.? I¡¯m pretty excited about this even though it turned out to be a disaster (idiot G-coder me)¡ but it was a step forward.? I have buckets full of scrap PCB to work from to work with to get this right¡ ?but my rather crude test measurements confirm Terrance¡¯s assertion that it is, indeed, worth about 20 db noise floor reduction on the upper bands to placing the entire display into a shielded box. ? I have a young hot-shot engineer that started working for my engineering consulting company this week¡ and I think I will put him on this project¡ to get him up to speed with our lab.? I¡¯d rather work on the 100W amp getting those kitted and finalize the Auto Tuner.? [BTW, anyone want to work along with us to see how that project comes together? I¡¯ll start a #Tuner thread for it]. ? ? 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 Terrance Robertson, KN6ZDE via groups.io
Sent: Thursday, March 27, 2025 5:11 PM To: [email protected] Subject: Re: [SoftwareControlledHamRadio] Radiated EMI from displays ? Another way to test this is to disconnect the display altogether.? This can't be done with the existing software as the code will hang trying to start the RA8875 object.? However, in developing the T41 Beacon Monitor, I created a version of the T41 software that doesn't update the display, though the RA8875 object was still there to display the Beacon Monitor.? With a bit of work, I separated that portion of the display code as well.? I can now completely disconnect the display.? It's not too hard to print the S-meter value to the serial monitor, but controlling the radio without a display is a bit of a guess.? That's where my comes in handy.? With that I see a 10 to 20 dB reduction in the noise floor on the upper bands of the 4SQRP without its 5" display.? This seems consistent with the results that John posted. ? I need to repeat this with my v12. ?? |
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Re: T41 V9 troubleshooting guide
I don't think so. That was V10. Jack, W8TEE
On Tuesday, April 8, 2025 at 01:31:10 PM EDT, K9HZ <bill@...> wrote:
Version 9?? Not familiar with that¡? Maybe that was a 4SQRP radio? ? ? 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 Duane B via groups.io
Sent: Tuesday, April 8, 2025 12:22 PM To: [email protected] Subject: [SoftwareControlledHamRadio] T41 V9 troubleshooting guide ? A co-worker purchased a V9 T41, but its not completely operational.? I know this is a few revs back, but is there a (per board) check out/troubleshooting guide somewhere for that rev??? Something with test point voltages? ? Thanks. ? Duane - K5CA -- Jack, W8TEE |
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Re: T41 V9 troubleshooting guide
¿ªÔÆÌåÓýVersion 9?? Not familiar with that¡? Maybe that was a 4SQRP radio? ? ? 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 Duane B via groups.io
Sent: Tuesday, April 8, 2025 12:22 PM To: [email protected] Subject: [SoftwareControlledHamRadio] T41 V9 troubleshooting guide ? A co-worker purchased a V9 T41, but its not completely operational.? I know this is a few revs back, but is there a (per board) check out/troubleshooting guide somewhere for that rev??? Something with test point voltages? ? Thanks. ? Duane - K5CA |
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Re: Menu oddities
How are you exiting the menu? Jack, W8TEE
On Tuesday, April 8, 2025 at 12:00:55 PM EDT, bty84827531 via groups.io <roger.trett@...> wrote:
Each time I press the enter/select button to select a menu setting the tuning fine increment changes. This only happens when exiting the menu. Just pressing select when not in a menu has no effect.
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I'm using the MCP23017 front panel.
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Has anyone else experienced this or have any ideas what might be causing it?
?
Roger G8JWT
-- Jack, W8TEE |
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Re: Freq Calibration
¿ªÔÆÌåÓý¡°The math under the hood in the frequency calibration routine doesn't account for the fine tune frequency offset.¡± ? I didn¡¯t catch that either¡ any reason for that.? Seems a bit quirky¡ ? ? 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 Oliver KI3P via groups.io
Sent: Tuesday, April 8, 2025 5:17 AM To: [email protected] Subject: Re: [SoftwareControlledHamRadio] Freq Calibration ? Are you saying that if you tune to 10 MHz and select SAM demodulation, you measure a frequency offset of 190 Hz? ? A gotcha with the frequency calibration is that it matters how you tune to 10 MHz -- don't touch the fine tune knob! The math under the hood in the frequency calibration routine doesn't account for the fine tune frequency offset. Instead, tune by pressing the Dir Freq (Direct Frequency) button and entering 10 on the button pad. Does that help? ? ? ? On Monday, April 7th, 2025 at 8:35 PM, epif18 via groups.io <epif18@...> wrote:
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Re: More testing on PA
Greg
You are correct very easy to over drive 160-80M. I tried lowering input but 6m really suffered.
I changed a lot of caps across input to t3 with lower drive but just could not get 6M close.
I started taking turns off L2 which started at 6uH. Tried the cap switching on each turn I removed, kept getting better.
Ended up with 3uH and 68pF cap across primary. -2dB input. I had the high gain on low bands building a 2kw LDMOS amp.?
A friend came up with a attenuator tuned for .5-1.4 Mhz I installed on input. I believe we can compensate with carful drive input tuning on T41. Tim W4YN
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Re: RA8875 display problems with T4.x - a visual study
Yep... Jack, W8TEE
On Monday, April 7, 2025 at 01:38:51 PM EDT, K9HZ <bill@...> wrote:
Yes the T41 radio was designed as a prototype(e-ing) platform.? If you make the base radio better for your desires with your changes, that¡¯s excellent.? That¡¯s what it¡¯s about. ? ? 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 Greg KF5N via groups.io
Sent: Monday, April 7, 2025 12:26 PM To: [email protected] Subject: Re: [SoftwareControlledHamRadio] RA8875 display problems with T4.x - a visual study ? What happened here is a series of rapid prototypes with incremental improvements.? I've got working hardware and software.? Forwards not backwards! ? -- 73 Greg KF5N -- Jack, W8TEE |
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Re: RA8875 display problems with T4.x - a visual study
¿ªÔÆÌåÓýYes the T41 radio was designed as a prototype(e-ing) platform.? If you make the base radio better for your desires with your changes, that¡¯s excellent.? That¡¯s what it¡¯s about. ? ? 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 Greg KF5N via groups.io
Sent: Monday, April 7, 2025 12:26 PM To: [email protected] Subject: Re: [SoftwareControlledHamRadio] RA8875 display problems with T4.x - a visual study ? What happened here is a series of rapid prototypes with incremental improvements.? I've got working hardware and software.? Forwards not backwards! ? -- 73 Greg KF5N |
jjpurdum
K9HZ