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Re: Transmitting noise
¿ªÔÆÌåÓýThat¡¯s not bad¡ there is some low-level noise on the signal at about 400 hz and I wonder what that is? ? ? 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: Saturday, April 5, 2025 9:44 AM To: [email protected] Subject: Re: [SoftwareControlledHamRadio] Transmitting noise ? ? The frequency calibration of my HackRF One is a little bit off, but here's what the audio sounds like from my radio (see attached WAV file). I haven't done anything to try to improve the mic. On Saturday, April 5th, 2025 at 10:32 AM, Oliver KI3P via groups.io <oliver@...> wrote:
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FW: [SoftwareControlledHamRadio] boards and kits and stuff
¿ªÔÆÌåÓýJohn¡ This is good work.? ? I just ordered the parts for the Display Driver kits after I got good reports from 4 of the 5 kits I sent out for people to try.? The parts for the remainder of the Drivers should be here by Tuesday.? I¡¯ll send you one when the parts get here. ? My goal is to generate a PCB type box to put over the display to keep the RFI down to a minimum.? If you can help me design those boxes for the % and 7 inch displays, I¡¯ll have some made and send you a couple to try out.? As you know, his makes a HUGE difference in the usable floor and weak signal reception/ sensitivity of the receiver. ? Also interested in any help from the readers of this to get this right the first time. ? ? 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 John V Lundberg via groups.io
Sent: Wednesday, March 19, 2025 1:52 PM To: [email protected] Subject: Re: [SoftwareControlledHamRadio] boards and kits and stuff ? I am interested in getting a 3.3 V board to see if it will further improve the receive noise on 6M by reducing radiation from the cable between the Main and Display boards. I have an AI6YM chassis with V12 Main, RF, and Front Panel boards. I use a 5" display in a shielded enclosure which greatly improved the RX noise floor on 80M through 10M (see the attachment). John W2TX |
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Re: SDTVer66.9 results
¿ªÔÆÌåÓýWhat is coming out of the QSE after the BPF?? The PA will amplify pretty much everything from 1-150 MHz (at different gains).? If the input is not clean, the output won¡¯t be that clean. ? ? 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 Robert Luken W3RDL via groups.io
Sent: Tuesday, March 25, 2025 4:51 PM To: [email protected] Subject: Re: [SoftwareControlledHamRadio] SDTVer66.9 results ? Bill, I don't have any oscillations, but then I don't have a LPF or PA built yet. I lost over a week trying to get back to where I could compile a running version.? I attached the spectrum of the 10m & 6m outputs from the RF board. The output on 6m is down significantly. On 3/24/2025 12:08 AM, K9HZ via groups.io wrote:
-- 73 Bob W3RDL |
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Re: RA8875 display problems with T4.x - a visual study
¿ªÔÆÌåÓýThe noise floor for the current V12 radio is better than -100 db as measured without the driver chip¡ My V11 with the buffer chip is nominally -78 db.? That is ok for a test platform (toy level) but intolerable for a modern radio¡ The new display driver board does not change that -100 db figure because it was designed specifically to buffer SPI signals (in that frequency range with softer on-off switching). ? ? 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: Tuesday, March 25, 2025 4:08 PM To: [email protected] Subject: Re: [SoftwareControlledHamRadio] RA8875 display problems with T4.x - a visual study ? On Tue, Mar 25, 2025 at 01:19 PM, K9HZ wrote:
I've been happy with my 4SQRP T41, but I don't have much experience with this.? What's considered an "intolerable" noise level for that radio? ? Currently, my partially built v12 has a receiver noise floor 48 dB above my 4SQRP unit.? I have enough experience to know something is wrong with my v12 build. |
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Re: RA8875 display problems with T4.x - a visual study
¿ªÔÆÌåÓýHave you got a block diagram of this/ signal flows.? Its something to contemplate vs. a FPGA and a Teensy.? I¡¯m formulating my next steps and want to get the next step absolutely perfect. ? ? 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 Mark J Culross
Sent: Tuesday, March 25, 2025 3:01 PM To: [email protected] Subject: Re: [SoftwareControlledHamRadio] RA8875 display problems with T4.x - a visual study ? Greg et al: ? The TMPS previously had noise induced in the audio chain by the display interface when everything was managed by a single Teensy (touching the screen & changing onscreen objects caused a high-pitched whine in the audio...the audio was also interrupted/delayed by the same actions).? That's the primary reason why I split the functionality across two Teensy processors, as well as spreading/reducing the RAM consumption & spreading/reducing the processor load.? Now that the audio & display are on separate Teensy processors, there is absolutely no detectable noise in the generated audio stream & everything executes in real time, so problem(s) solved. ? Mark J Culross KD5RXT ? ?
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Re: Ver066_9_3_22_25
¿ªÔÆÌåÓýMay be a bad cable or on the wrong cable (remember¡ there is WINE, WIRE1, and WIRE2¡. Three channels for the I2C comms so you gotta be on the right cable.? See the development document on the github about the I2C assignments). ? ? 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 epif18 via groups.io
Sent: Tuesday, March 25, 2025 10:15 AM To: [email protected] Subject: [SoftwareControlledHamRadio] Ver066_9_3_22_25 ? Hey yall', I was running Ver66.9 and it seemed to address some of the issues I was having.? Calibrated FREQ and REC I/Q.? All good through several shutdowns and startups. Shut my radio down and brought it back up and now there is no spectrum, waterfall, audio.? Keypad and encoders don't work.? BIT passes.? For a while the SWR 7991 wasn't being picked up (failed), resoldered it and it still failed.? Then, on one restart, it magically passed. ?I reformatted the SD card, no luck. ?Re-extracted the .zip, recompiled and reloaded, no luck.? Weird! Thought MAIN may have failed, but I loaded Ver66.4 and that worked.? Has anyone seen this?? SWR 7991 commented out.? RF 23017 is at 0x22, not 0x27. Argh! Thanks Mark |
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Re: Transmitting noise
Thanks Oliver.? I'll redo the tests next week. dave On Sat, Apr 5, 2025 at 10:32?AM Oliver KI3P via <oliver=[email protected]> wrote:
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Re: Transmitting noise
The frequency calibration of my HackRF One is a little bit off, but here's what the audio sounds like from my radio (see attached WAV file). I haven't done anything to try to improve the mic.
On Saturday, April 5th, 2025 at 10:32 AM, Oliver KI3P via groups.io <oliver@...> wrote:
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Re: Transmitting noise
If I connect a broadband power meter to the output of my radio I measure the following:
So I get roughly similar numbers. If I connect an oscilloscope across a 50 Ohm load connected to the antenna output I see the following waveform when I start PTT with no mic connected, SSB mode at 14.1 MHz. I don't see a signal that exponentially decays in 5 ms. If I press the PTT while whistling loudly, the waveform looks like this (note the change in vertical scale from 5 to 20V per division):
On Friday, April 4th, 2025 at 4:12 PM, D Solt via groups.io <davesolt@...> wrote:
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Reminder
¿ªÔÆÌåÓýJust a reminder that I will ALWAYS send out an invoice for boards and kits you order from me.? Wait for the invoice.? NEVER send me money without an invoice because it messes up my accounting system and you will just get that money refunded. ? ? 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: [AmateurRadioBuilders] Back in the Saddle
¿ªÔÆÌåÓýThe only think that has changed on this list is the RF board¡ and that change was just to remove the divider circuit for the low-frequency operation that can now be done in software.? The previous board can be used by just not building out the divider circuits.? They are otherwise identical and no need to rush out and get the new boards. ? ? 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 John Owens K1JO via groups.io
Sent: Saturday, April 5, 2025 8:10 AM To: [email protected] Subject: Re: [AmateurRadioBuilders] Back in the Saddle ? Thanks Bill, I appreciate any advice. 2 - BPF 2024-04-20 V012.6 4 - Encoder Boards 3428224 AP11 |
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Re: More testing on PA
¿ªÔÆÌåÓýI have four of the PA kits built here and I get a gain fluctuation of +0.2/-0.8 from 1-54 Mhz inclusive after a little tuning of the capacitor across the T3 primary.? You might check to make sure you got the right numbers of turns on T1, T2, and T3¡ More than one person has had trouble with that. ? ? 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: Thursday, April 3, 2025 7:46 PM To: [email protected] Subject: Re: [SoftwareControlledHamRadio] More testing on PA ? On Wed, Apr 2, 2025 at 07:48 AM, K9HZ wrote: Dr. Bill Playing with compensation caps around 180-220 flattens out from 3-30Mhz I can't seem to get much gain past 35-40Mhz Still playing not that interested in 6M qrp? so not a big deal. ? Just curious on how Paul got his so flat out to 50Mhz. Tim? ? ? |
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Re: Updated (and final) Version of T41 book
Thanks, Todd...it's appreciated! Jack, W8TEE
On Saturday, April 5, 2025 at 06:20:17 AM EDT, Todd W2TEF via groups.io <w2tef@...> wrote:
Thank you, Jack and Al, for this labor of love! This has been a monumental contribution to Amateur Radio! 73 de Todd W2TEF -- Jack, W8TEE |
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Re: [AmateurRadioBuilders] Updated (and final) Version of T41 book
¿ªÔÆÌåÓýOur booth at Hamvention is inside this year¡ 4111 in building 4. ?You can buy the lasted and greatest T41 boards and kits along with everything else I sell there. ?Plus we will be advertising the contest station for rent. ??My wife was tired of being out in the rain and the smell of the porto-pottys in the outfield. ? 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 Apr 4, 2025, at 12:33?PM, Albert Peter via groups.io <albertfpeter@...> wrote:
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Updated (and final) Version of T41 book
All: Al and I have just updated the 3rd edition T41 book. We moved the calibration info from Appendix C to its own chapter (20). The expanded instructions and new software make T41 calibration much easier. We have also updated the narrative in numerous places and have concentrated discussions on the V12.6 release where those changes are important. Some of you are asking yourself: Do I need to buy this update. Truthfully, if you already own the 3rd edition, we would say no. Most of the important changes are discussed on the web site and photos and schematics are available there, too. On the other hand, this is the last change we will be making to this book. Al and I have been at this for almost 7 years now and we're getting a little burned out. For that reason, we are turning this site over to Oliver King, KI3P, and Dr. Bill Schmidt, K9HZ. Al and I will continue to be active relative to the T41, but will leave the details to Oliver and Bill. If you do want the final version of the book, its new cover looks like this: The book is actually available now, but
the Amazon ad will not reflect the new cover for about 10 more days.
(If you order now, it will be the new version.) If you are attending
the FDIM conference this May (coincides with Dayton Hamvention and
the conference hotel is about 10 miles away), Al and I will be
selling autographed copies on Thursday night (May 15th) at
the conference hotel starting around 8PM. We have reduced the price
of the autographed copies from $12,500 to $40...which is a deal and
less than the Amazon price! If you have a previous copy of the book,
bring it along and we will be happy to sign it.
This has been a fun project and we want to thanks the hundreds of people have contributed to its improvement over time. We hope that continues long after Al and I are gone.
72, Jack Purdum, W8TEE Al Peter, AC8GY -- Jack, W8TEE |
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Re: Where can I purchase V12 pc boards for the T41-EP SDT?
¿ªÔÆÌåÓýThat would be me. ? Ill be home late tonight. ?Tell me what you are looking for exactly. ?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 Apr 4, 2025, at 9:55?AM, rkherod via groups.io <rkherod@...> wrote:
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K9HZ
jjpurdum
Todd W2TEF