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Re: Rob Sherwood Presentation Slides on Amateur Radio Transceiver Performance
¿ªÔÆÌåÓýOh yeah¡ now I remember¡ it¡¯s the reason I have a large building full of Standard AM/FM broadcast transmitters. ? ? 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 Dave Mueller AA3EE via groups.io
Sent: Wednesday, February 12, 2025 3:02 PM To: [email protected] Subject: Re: [SoftwareControlledHamRadio] Rob Sherwood Presentation Slides on Amateur Radio Transceiver Performance ? ATSC uses 8VSB modulation. ? |
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Re: Excessive Noise
Hey yall'
I think I found a player in the noise problem (maybe one of several!).? I had a very marginal power return connection that I corrected, not sure how this thing even worked with this problem.? Noise problem better but I have this pulsating audio problem that varies by band.? I'm running V12, Ver50.2, Debug off, TXCO, 528MHz, Faster with LTO.? 20M is the worst. I get the same problem going thru an audio amp or directly to MAIN with headphones.? I've tried different Teensy frequencies and all the LTO options to no avail.? I've looked thru the pulsating audio thread but they seemed to apply to older SW versions, maybe even V11 HW.
Thoughts?
Thanks
Mark
KU3O |
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Re: Rob Sherwood Presentation Slides on Amateur Radio Transceiver Performance
¿ªÔÆÌåÓýMust have been an FM system?? That process would not work very well for SSB¡ ? ? 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 Dave Mueller AA3EE via groups.io
Sent: Wednesday, February 12, 2025 10:03 AM To: [email protected] Subject: Re: [SoftwareControlledHamRadio] Rob Sherwood Presentation Slides on Amateur Radio Transceiver Performance ? The system I worked on (ATSC) wasn't real time/continuous. The system took a snapshot of the RF, calculated then applied the corrections, then stopped. It could be set to run every X minutes, but typically after everything reached operating temperatures, there was little improvement. It used two samples, one before and one after the final PA system. Linear correction was for gain variations and group delay caused by the extremely sharp filter edges, non-linear was for distortion. A third party modulator we used for DVB had the corrections done manually by dragging points around on a graph via a laptop then sending the data to the modulator. Not as fun as pushing a button when you're working on a rooftop! |
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Re: Testing Band Pass Filter Board
¿ªÔÆÌåÓýThat test software just tests to determine if the hardware is there and functioning¡ not for receiving and transmitting signals¡ ? ? 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 Tim via groups.io
Sent: Wednesday, February 12, 2025 9:07 AM To: [email protected] Subject: [SoftwareControlledHamRadio] Testing Band Pass Filter Board ? I see the sketch for testing board. I assume you load this into Teensy and plug BPF board into Boards Header?? Not sure how I tell Teensy which band to activate. I am thinking? alternate maybe just use regular STD and select band might accomplish same thing? Tim? |
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Re: Rob Sherwood Presentation Slides on Amateur Radio Transceiver Performance
The system I worked on (ATSC) wasn't real time/continuous. The system took a snapshot of the RF, calculated then applied the corrections, then stopped. It could be set to run every X minutes, but typically after everything reached operating temperatures, there was little improvement. It used two samples, one before and one after the final PA system. Linear correction was for gain variations and group delay caused by the extremely sharp filter edges, non-linear was for distortion.
A third party modulator we used for DVB had the corrections done manually by dragging points around on a graph via a laptop then sending the data to the modulator. Not as fun as pushing a button when you're working on a rooftop! |
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Right-Left Rule Examples:
I presented the Right-Left Rule in the C Programming Guide book (1982) and there have been lots of examples written since then. This is a list of example you might use to test your understanding of the Rule, including some illegal data definitions:
-- Jack, W8TEE |
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Re: V12 compiling error
On 2025-02-11 10:01, K9HZ wrote:
No problem¡ if you have amplified speakers or a stereo amp*** This reminds me of a project I've got on the back-burner. I got an amp that should be relatively decent. And a Boston Acoustics speaker mounted on the wall. Four HF rigs on the desk. I switch the antenna with a manual switch. I'd like to build a gadget to switch both the antenna and the speaker & amp to the desired HF rig. I've got a little card for switching antennas - with four beefy relays. Bought it from an Eastern European vendor on Ebay. - Jerry, KF6VB |
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Re: V12 compiling error
¿ªÔÆÌåÓýNo problem¡ if you have amplified speakers or a stereo amp (audiophile or music)¡ I encourage you to use 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 Tim via groups.io
Sent: Tuesday, February 11, 2025 11:53 AM To: [email protected] Subject: Re: [SoftwareControlledHamRadio] V12 compiling error ? THX Dr. Bill I was using headphones, only hear some clicking regular spaced noise, very suspicious Hi. Tim? ? |
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Re: V12 compiling error
¿ªÔÆÌåÓýJust so you are not misled here¡ the audio out from the main board needs to go to an external audio amp to hear stuff from a speaker.? The output from the audio jack J14 (from the PCM5102) is about 2V maximum¡? That may drive some high impedance headphones but not a speaker! ? ? 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 Tim via groups.io
Sent: Tuesday, February 11, 2025 10:35 AM To: [email protected] Subject: Re: [SoftwareControlledHamRadio] V12 compiling error ? I think audio is hardware I will check Daudio out on Tweensy to see if signal is there, if so then it is U5. I reloaded Jack's beta and it has working S meter and I see signal in filter window. I can try reloading yours later.? I loaded it using Tweensy Loader, could not quite figure out how do from Arduino IDE, as Dr. Bill says it may not be obvious. You guys are great , last real programming I did was in 90's !? The Arduino IDE keeps getting better I remember the days before the Library manager, much easier especially loading zip file from gethub! Tim? |
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Re: V12 compiling error
I believe water fall was working in Jerry's just no signal in Filter Window
Jack's beta both water fall and filter window is working FB.?
?
I have noticed that on startup the signal strength is initially low and builds to reasonable level in a few seconds or so.
Might be AGC related.
?
Tim? |
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Re: V12 compiling error
¿ªÔÆÌåÓýBut does the waterfall 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 Tim via groups.io
Sent: Tuesday, February 11, 2025 10:16 AM To: [email protected] Subject: Re: [SoftwareControlledHamRadio] V12 compiling error ? In Jacks Beta the S meter was working, this version the S meter is not , don't see a signal in filter window either. Tim? ? |
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Re: V12 compiling error
I think audio is hardware I will check Daudio out on Tweensy to see if signal is there, if so then it is U5.
I reloaded Jack's beta and it has working S meter and I see signal in filter window.
I can try reloading yours later.?
I loaded it using Tweensy Loader, could not quite figure out how do from Arduino IDE, as Dr. Bill says it may not be obvious.
You guys are great , last real programming I did was in 90's !?
The Arduino IDE keeps getting better I remember the days before the Library manager, much easier especially loading zip file from gethub!
Tim? |
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Re: V12 compiling error
Interesting. I've got that software running on my V12 - working S meter
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and also audio out. - Jerry, KF6VB On 2025-02-11 08:16, Tim via groups.io wrote:
In Jacks Beta the S meter was working, this version the S meter is not |
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Re: V12 compiling error
I have my T41 in pieces right now as I'm putting in a new LPF board and will be moving it to a new case. It will be tomorrow or the next day before I can check this. Jack, W8TEE
On Tuesday, February 11, 2025 at 11:16:20 AM EST, Tim via groups.io <w4yn@...> wrote:
In Jacks Beta the S meter was working, this version the S meter is not , don't see a signal in filter window either.
Tim?
?
-- Jack, W8TEE |
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