Re: Updated 3rd Edition book NOT shipping from Amazon yet
Can those of us (with proof) of purchasing the previous version, get an electronic version of the new Chapter 20? Just asking :)
|
The T41 from 4SQRP and V11 boards.
All:
Recent there was a negative post about the V11 boards and the T41 from 4SQRP. I got this private email from Neville Marr, ZL2BNE, who has been following the T41 from its inception. He has a T41 from 4SQRP and speaks positively about it. I asked him if I could re-post his email because I know there are a lot of 4SQRP radios out there and he wants everyone to know that it is a good radio that he uses on a regular basis. I, too, have a 4SQRP T41 and it is a very good radio. He gave me his okay to post his email.
Jack, W8TEE
===============
?
Hi Jack,
We haven¡¯t communicated in quite some time but I continue to check-in on the softwarecontrolledhamradio group from time to time.
I¡¯ve recently reviewed postings and one took my attention ¡ for the wrong reasons.?
/g/SoftwareControlledHamRadio/message/33358 The post was pretty disparaging of the V11 receiver performance, among other things calling it an intolerable toy radio. I see no point in giving such posts oxygen on the forum but I felt a need to let you know my experience is totally different. You will recall I was an early adopter of the T41 project, I had V10 boards made and did my own thing. You will also recall I was quite critical of some aspects of the project. I always had issues with the transmit side of my V10 T41 but never the receive side. The receiver worked from day one. In my case I don¡¯t hear any noise on rx with a dummy load connected. I can easily hear my Marconi sig gen set as low as it will go at -127dBm. It¡¯s a very good receiver. Over time I made a number of hardware changes to my QSE, I built two filters of my own design, one follows the QSE the other follows the PA. Final transmit change is adopting the K9HZ PA. Today my radio works faultlessly using Greg¡¯s T41EEE. I got everything where I wanted and started logging contacts in August 2023. I¡¯m not much of an operator but do put my creations on the air. I¡¯ve just interrogated my log to discover I¡¯ve logged exactly 100 contacts using my T41. Quite a cool number. I¡¯ve had the T41 on the air more times than that, mainly local nets, but all the same 100 in the log. Below is a breakdown of the 100. I¡¯ve worked every continent except Africia (Africia is notoriously difficult to work from NZ, South Africia is the rarest DX from NZ). So thank you for getting the T41 up and running. I am a little sad that V10/11 got supplanted by V12 because V10/11 is a very good radio. I do hope people can get V12 to a place where V12 T41 are on the air too. My T41 is my go-to radio, my daily runner. ?Cheers, Neville ZL2BNE ?  ? ? -- Jack, W8TEE
|
Re: Updated 3rd Edition book NOT shipping from Amazon yet
If I didn't have bad luck...
On Wednesday, April 9, 2025 at 11:35:34 PM EDT, Jim Pruitt WA7DUY via groups.io <jpruitt67@...> wrote:
Hello Jack. I ordered mine on Friday April 5.? It arrived Monday and does have the black T41 and chapter 20.? I was surprised that it contained no copyright page or data that I could find.
Thank you.
Jim Pruitt? WA7DUY?
All:
I ordered two copies for Al and I to review, and they sent me the old book, too. I will be sending mine back, too. When I order again, I'm going to tell them to make sure it has the new cover and Chapter 20, since the previous edition didn't have a Chapter 20. I have no idea what we wrong as the are advertising the new version.
Jack, W8TEE
On Wednesday, April 9, 2025 at 04:53:37 PM EDT, J P Watters via <jpwatters= [email protected]> wrote:
Jack,
I ordered mine on April 4th, delivered on April 6th
And it would appear to be the updated version.
..jpw J P Watters KC9KKO Morris, IL USA
Duane:
There should be no stock as it is a "Print on Demand" book. Tell then to check for Chapter 20, because earlier versions don't have a chapter 20.
Jack, W8TEE
On Wednesday, April 9, 2025 at 09:57:26 AM EDT, Duane B via <dbrantley= [email protected]> wrote:
Hi Jack.
?
I ordered it on April 5th.? It was delivered on the 8th.? I plan to return it.? Was going to give them a couple of days to deplete what stock they have.
?
Duane - K5CA
-- Jack, W8TEE
--
Jack, W8TEE
-- Jim Pruitt WA7DUY
--
Jack, W8TEE
|
Re: Updated 3rd Edition book NOT shipping from Amazon yet
Hello Jack. I ordered mine on Friday April 5.? It arrived Monday and does have the black T41 and chapter 20.? I was surprised that it contained no copyright page or data that I could find.
Thank you.
Jim Pruitt? WA7DUY?
All:
I ordered two copies for Al and I to review, and they sent me the old book, too. I will be sending mine back, too. When I order again, I'm going to tell them to make sure it has the new cover and Chapter 20, since the previous edition didn't have a Chapter 20. I have no idea what we wrong as the are advertising the new version.
Jack, W8TEE
On Wednesday, April 9, 2025 at 04:53:37 PM EDT, J P Watters via <jpwatters= [email protected]> wrote:
Jack,
I ordered mine on April 4th, delivered on April 6th
And it would appear to be the updated version.
..jpw J P Watters KC9KKO Morris, IL USA
Duane:
There should be no stock as it is a "Print on Demand" book. Tell then to check for Chapter 20, because earlier versions don't have a chapter 20.
Jack, W8TEE
On Wednesday, April 9, 2025 at 09:57:26 AM EDT, Duane B via <dbrantley= [email protected]> wrote:
Hi Jack.
?
I ordered it on April 5th.? It was delivered on the 8th.? I plan to return it.? Was going to give them a couple of days to deplete what stock they have.
?
Duane - K5CA
-- Jack, W8TEE
--
Jack, W8TEE
--
Jim Pruitt
WA7DUY
|
Re: Updated 3rd Edition book NOT shipping from Amazon yet
I will do the same.?
I will be on the lookout for the new version.
..jpw J P Watters KC9KKO Morris, IL USA
toggle quoted message
Show quoted text
On Apr 9, 2025, at 9:13?PM, jjpurdum via groups.io <jjpurdum@...> wrote:
I just returned mine by saying they sent the wrong book. I then told them about the new version with the new Chapter 20. They issued me a refund and I have to return it to Staples.
Jack, W8TEE
On Wednesday, April 9, 2025 at 09:55:00 PM EDT, J P Watters via groups.io <jpwatters@...> wrote:
Jack,
Ahhhhgggg,
Chapter 19 Enhancements, and NO Chapter 20!!!!!! But it does have a shiny cover showing ¡°Third Edition Includes V11 & V12¡±
And without Chapter 20 would mean that who knows what they actually printed.
..jpw J P Watters KC9KKO Morris, IL USA
On Apr 9, 2025, at 8:43?PM, jjpurdum via groups.io <jjpurdum@...> wrote:
All:
I ordered two copies for Al and I to review, and they sent me the old book, too. I will be sending mine back, too. When I order again, I'm going to tell them to make sure it has the new cover and Chapter 20, since the previous edition didn't have a Chapter 20. I have no idea what we wrong as the are advertising the new version.
Jack, W8TEE
On Wednesday, April 9, 2025 at 04:53:37 PM EDT, J P Watters via ??< jpwatters@...> wrote:
Jack,
I ordered mine on April 4th, delivered on April 6th
And it would appear to be the updated version.
<PastedGraphic-1.tiff>
..jpw J P Watters KC9KKO Morris, IL USA On Apr 9, 2025, at 11:50?AM, jjpurdum via groups.io <jjpurdum@...> wrote:
Duane:
There should be no stock as it is a "Print on Demand" book. Tell then to check for Chapter 20, because earlier versions don't have a chapter 20.
Jack, W8TEE
On Wednesday, April 9, 2025 at 09:57:26 AM EDT, Duane B via groups.io <dbrantley@...> wrote:
Hi Jack. ? I ordered it on April 5th.? It was delivered on the 8th.? I plan to return it.? Was going to give them a couple of days to deplete what stock they have. ? Duane - K5CA -- ?Jack, W8TEE
-- Jack, W8TEE
|
Re: Updated 3rd Edition book NOT shipping from Amazon yet
I just returned mine by saying they sent the wrong book. I then told them about the new version with the new Chapter 20. They issued me a refund and I have to return it to Staples.
Jack, W8TEE
On Wednesday, April 9, 2025 at 09:55:00 PM EDT, J P Watters via groups.io <jpwatters@...> wrote:
Jack,
Ahhhhgggg,
Chapter 19 Enhancements, and NO Chapter 20!!!!!! But it does have a shiny cover showing ¡°Third Edition Includes V11 & V12¡±
And without Chapter 20 would mean that who knows what they actually printed.
..jpw J P Watters KC9KKO Morris, IL USA
On Apr 9, 2025, at 8:43?PM, jjpurdum via groups.io <jjpurdum@...> wrote:
All:
I ordered two copies for Al and I to review, and they sent me the old book, too. I will be sending mine back, too. When I order again, I'm going to tell them to make sure it has the new cover and Chapter 20, since the previous edition didn't have a Chapter 20. I have no idea what we wrong as the are advertising the new version.
Jack, W8TEE
On Wednesday, April 9, 2025 at 04:53:37 PM EDT, J P Watters via ??< jpwatters@...> wrote:
Jack,
I ordered mine on April 4th, delivered on April 6th
And it would appear to be the updated version.
<PastedGraphic-1.tiff>
..jpw J P Watters KC9KKO Morris, IL USA On Apr 9, 2025, at 11:50?AM, jjpurdum via groups.io <jjpurdum@...> wrote:
Duane:
There should be no stock as it is a "Print on Demand" book. Tell then to check for Chapter 20, because earlier versions don't have a chapter 20.
Jack, W8TEE
On Wednesday, April 9, 2025 at 09:57:26 AM EDT, Duane B via groups.io <dbrantley@...> wrote:
Hi Jack. ? I ordered it on April 5th.? It was delivered on the 8th.? I plan to return it.? Was going to give them a couple of days to deplete what stock they have. ? Duane - K5CA -- ?Jack, W8TEE
-- Jack, W8TEE
|
Re: Updated 3rd Edition book NOT shipping from Amazon yet
That's what was on the old cover. Look at the new cover. It's not even the same T41...it's a black 3D printed case!
On Wednesday, April 9, 2025 at 09:55:00 PM EDT, J P Watters via groups.io <jpwatters@...> wrote:
Jack,
Ahhhhgggg,
Chapter 19 Enhancements, and NO Chapter 20!!!!!! But it does have a shiny cover showing ¡°Third Edition Includes V11 & V12¡±
And without Chapter 20 would mean that who knows what they actually printed.
..jpw J P Watters KC9KKO Morris, IL USA
On Apr 9, 2025, at 8:43?PM, jjpurdum via groups.io <jjpurdum@...> wrote:
All:
I ordered two copies for Al and I to review, and they sent me the old book, too. I will be sending mine back, too. When I order again, I'm going to tell them to make sure it has the new cover and Chapter 20, since the previous edition didn't have a Chapter 20. I have no idea what we wrong as the are advertising the new version.
Jack, W8TEE
On Wednesday, April 9, 2025 at 04:53:37 PM EDT, J P Watters via ??< jpwatters@...> wrote:
Jack,
I ordered mine on April 4th, delivered on April 6th
And it would appear to be the updated version.
<PastedGraphic-1.tiff>
..jpw J P Watters KC9KKO Morris, IL USA On Apr 9, 2025, at 11:50?AM, jjpurdum via groups.io <jjpurdum@...> wrote:
Duane:
There should be no stock as it is a "Print on Demand" book. Tell then to check for Chapter 20, because earlier versions don't have a chapter 20.
Jack, W8TEE
On Wednesday, April 9, 2025 at 09:57:26 AM EDT, Duane B via groups.io <dbrantley@...> wrote:
Hi Jack. ? I ordered it on April 5th.? It was delivered on the 8th.? I plan to return it.? Was going to give them a couple of days to deplete what stock they have. ? Duane - K5CA -- ?Jack, W8TEE
-- Jack, W8TEE
|
Re: Updated 3rd Edition book NOT shipping from Amazon yet
Jack,
Ahhhhgggg,
Chapter 19 Enhancements, and NO Chapter 20!!!!!! But it does have a shiny cover showing ¡°Third Edition Includes V11 & V12¡±
And without Chapter 20 would mean that who knows what they actually printed.
..jpw J P Watters KC9KKO Morris, IL USA
toggle quoted message
Show quoted text
On Apr 9, 2025, at 8:43?PM, jjpurdum via groups.io <jjpurdum@...> wrote:
All:
I ordered two copies for Al and I to review, and they sent me the old book, too. I will be sending mine back, too. When I order again, I'm going to tell them to make sure it has the new cover and Chapter 20, since the previous edition didn't have a Chapter 20. I have no idea what we wrong as the are advertising the new version.
Jack, W8TEE
On Wednesday, April 9, 2025 at 04:53:37 PM EDT, J P Watters via ??< jpwatters@...> wrote:
Jack,
I ordered mine on April 4th, delivered on April 6th
And it would appear to be the updated version.
<PastedGraphic-1.tiff>
..jpw J P Watters KC9KKO Morris, IL USA On Apr 9, 2025, at 11:50?AM, jjpurdum via groups.io <jjpurdum@...> wrote:
Duane:
There should be no stock as it is a "Print on Demand" book. Tell then to check for Chapter 20, because earlier versions don't have a chapter 20.
Jack, W8TEE
On Wednesday, April 9, 2025 at 09:57:26 AM EDT, Duane B via groups.io <dbrantley@...> wrote:
Hi Jack. ? I ordered it on April 5th.? It was delivered on the 8th.? I plan to return it.? Was going to give them a couple of days to deplete what stock they have. ? Duane - K5CA -- ?Jack, W8TEE
|
Re: Updated 3rd Edition book NOT shipping from Amazon yet
Get your money back or have them send the correct one. Make sure to tell them they sent you the previous version, not the new one that went Live on the 4th.
Jack, W8TEE
On Wednesday, April 9, 2025 at 04:53:37 PM EDT, J P Watters via groups.io <jpwatters@...> wrote:
Jack,
I ordered mine on April 4th, delivered on April 6th
And it would appear to be the updated version.
..jpw J P Watters KC9KKO Morris, IL USA
On Apr 9, 2025, at 11:50?AM, jjpurdum via groups.io <jjpurdum@...> wrote:
Duane:
There should be no stock as it is a "Print on Demand" book. Tell then to check for Chapter 20, because earlier versions don't have a chapter 20.
Jack, W8TEE
On Wednesday, April 9, 2025 at 09:57:26 AM EDT, Duane B via groups.io <dbrantley@...> wrote:
Hi Jack.
?
I ordered it on April 5th.? It was delivered on the 8th.? I plan to return it.? Was going to give them a couple of days to deplete what stock they have.
?
Duane - K5CA
-- Jack, W8TEE
--
Jack, W8TEE
|
Re: Updated 3rd Edition book NOT shipping from Amazon yet
All:
I ordered two copies for Al and I to review, and they sent me the old book, too. I will be sending mine back, too. When I order again, I'm going to tell them to make sure it has the new cover and Chapter 20, since the previous edition didn't have a Chapter 20. I have no idea what we wrong as the are advertising the new version.
Jack, W8TEE
On Wednesday, April 9, 2025 at 04:53:37 PM EDT, J P Watters via groups.io <jpwatters@...> wrote:
Jack,
I ordered mine on April 4th, delivered on April 6th
And it would appear to be the updated version.
..jpw J P Watters KC9KKO Morris, IL USA
On Apr 9, 2025, at 11:50?AM, jjpurdum via groups.io <jjpurdum@...> wrote:
Duane:
There should be no stock as it is a "Print on Demand" book. Tell then to check for Chapter 20, because earlier versions don't have a chapter 20.
Jack, W8TEE
On Wednesday, April 9, 2025 at 09:57:26 AM EDT, Duane B via groups.io <dbrantley@...> wrote:
Hi Jack.
?
I ordered it on April 5th.? It was delivered on the 8th.? I plan to return it.? Was going to give them a couple of days to deplete what stock they have.
?
Duane - K5CA
-- Jack, W8TEE
--
Jack, W8TEE
|
The code I wrote to measure SWR from the forward and reflected powers is here:
https://github.com/DRWJSCHMIDT/T41/tree/main/T41_V012_Files/T41_V012_Software/T41_V12_Software_For_Board_Testing/K9HZ_LPF_tester
I think Al used it as the starting point for the code that's in ver 66-9, though he took it a lot further and added the calibration methods.
Adding support for the diodes is a long way down the priority list for me, so don't hold your breath. Maybe someone out there with a V12 radio would like to take this on and share their work with the rest of us?
toggle quoted message
Show quoted text
-------- Original Message -------- On 4/9/25 6:05 PM, K9HZ wrote: Dave¡ the code for the analog SWR metering is not there.? The code for the I2C stuff is¡ BUT with this said, its not a hard thing to do.? A12 is Forward power and A13 is Reflected at the teensy¡ so then you just need to calibrate the voltages in after scanning with the teensy.? Remember they are LOG Voltages for power... so Forward Power = A*log (forward voltage) and Reflected Power = B*Log(reflected voltage). ?Then SWR is gamma = Reflected Power/ Forward power¡. And SWR = (1+sqrt(gamma))/(1-sqrt(gamma)). ? 
? I think Oliver did program this up once upon a time¡ would probably take him 10 seconds to do 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@... ? ? ? I am running the latest SW ver66.9, downloaded today.? I am use the analog SWR circuits.? I have good FWD-V (~1.5V) and REV-V (0.005) into the dummy load and REV-V varies as load resistance varies.? In the Cal screen, Power and SWR measure "inf" and "nan".? Nothing changes them.? And, where should the pots, RV19 and RV27, be set?? Thanks for the help.
|
Dave¡ the code for the analog SWR metering is not there.? The code for the I2C stuff is¡ BUT with this said, its not a hard thing to do.? A12 is Forward power and A13 is Reflected at the teensy¡ so then you just need to calibrate the voltages in after scanning with the teensy.? Remember they are LOG Voltages for power... so Forward Power = A*log (forward voltage) and Reflected Power = B*Log(reflected voltage). ?Then SWR is gamma = Reflected Power/ Forward power¡. And SWR = (1+sqrt(gamma))/(1-sqrt(gamma)). ? 
? I think Oliver did program this up once upon a time¡ would probably take him 10 seconds to do 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@... ? ?
toggle quoted message
Show quoted text
From: [email protected] <[email protected]> On Behalf Of D Solt via groups.io
Sent: Wednesday, April 9, 2025 3:03 PM
To: [email protected]
Subject: [SoftwareControlledHamRadio] SWR Calibration? I am running the latest SW ver66.9, downloaded today.? I am use the analog SWR circuits.? I have good FWD-V (~1.5V) and REV-V (0.005) into the dummy load and REV-V varies as load resistance varies.? In the Cal screen, Power and SWR measure "inf" and "nan".? Nothing changes them.? And, where should the pots, RV19 and RV27, be set?? Thanks for the help.
|
Cool Dave!? Congrats! ? ? 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@... ? ?
toggle quoted message
Show quoted text
From: [email protected] <[email protected]> On Behalf Of D Solt via groups.io
Sent: Wednesday, April 9, 2025 2:03 PM
To: [email protected]
Subject: Re: [SoftwareControlledHamRadio] Transmitting noise? Made my first contact!!!!!!!!!!!!!? Got good audio report, so the noise in the background was not noticed.
|
Re: Updated 3rd Edition book NOT shipping from Amazon yet
Jack,
I ordered mine on April 4th, delivered on April 6th
And it would appear to be the updated version.
..jpw J P Watters KC9KKO Morris, IL USA
toggle quoted message
Show quoted text
On Apr 9, 2025, at 11:50?AM, jjpurdum via groups.io <jjpurdum@...> wrote:
Duane:
There should be no stock as it is a "Print on Demand" book. Tell then to check for Chapter 20, because earlier versions don't have a chapter 20.
Jack, W8TEE
On Wednesday, April 9, 2025 at 09:57:26 AM EDT, Duane B via groups.io <dbrantley@...> wrote:
Hi Jack.
?
I ordered it on April 5th.? It was delivered on the 8th.? I plan to return it.? Was going to give them a couple of days to deplete what stock they have.
?
Duane - K5CA
-- Jack, W8TEE
|
I am running the latest SW ver66.9, downloaded today.? I am use the analog SWR circuits.? I have good FWD-V (~1.5V) and REV-V (0.005) into the dummy load and REV-V varies as load resistance varies.? In the Cal screen, Power and SWR measure "inf" and "nan".? Nothing changes them.? And, where should the pots, RV19 and RV27, be set?? Thanks for the help.
dave, n3ds
|
Made my first contact!!!!!!!!!!!!!? Got good audio report, so the noise in the background was not noticed.
On to calibrate the SWR
dave, n3ds
|
Thank you, Oliver, your fixes all worked very well.? Those that you fixed have been ¡°Bugging¡± ha, ha, me for a while. Rick Price KN4AIE ?
toggle quoted message
Show quoted text
From: [email protected] <[email protected]> On Behalf Of Oliver KI3P via groups.io
Sent: Wednesday, April 9, 2025 6:30 AM
To: [email protected]
Subject: Re: [SoftwareControlledHamRadio] Freq Calibration? Missed your original message Rick, sorry about that. This was a fun one* to track down. It turned out to be due to the logic flag that tracks whether the main menu is still active. It was being left TRUE when exiting the menu windows instead of being reset to FALSE. See this line for the place where this bug intersects with the encoder reading code: I fixed it by just before returning from SetSecondaryMenuIndex() in Menu.cpp: mainMenuWindowActive = false; On Tuesday, April 8th, 2025 at 8:42 PM, Rick Price via groups.io <rickprice48@...> wrote:
Oliver, as long as your fixing some minor bugs¡. When the radio is turned on and have not selected any matrix buttons the audio filter tune works correctly. After selecting any matrix button the filter tune adjustment reverses direction and the amount of increment movement for any rotational movement is divided by at least 10. Turn the radio off and right back on filter tune works correctly until a matrix button is selected and the above happens again. Don¡¯t know if you saw my add on earlier about selecting CW and having the fine tune increment cycle with each CW selection and cancellation. Maybe you have already addressed that with the changes you just made. I will download the new bug fixes and let you know if it is still doing it. Rick, KN4AIE ? ? I've fixed this one too. Added a call to ResetTuning() at line 33 of MenuProc.cpp -- i.e., reset the tuning right before calling CalibrateFrequency(). See the changed line on GitHub here: On Tuesday, April 8th, 2025 at 6:47 PM, Oliver KI3P via groups.io <oliver@...> wrote: No reason for it, it's just another bug that needs to be squashed. On Tuesday, April 8th, 2025 at 11:51 AM, K9HZ <bill@...> wrote: ¡°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@... ? ? ? 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: I'm running a V12, 66.9, TCXO.? I've run freq cal and I'm off by 190 hz.? I've hard coded the cal value into si5351.init as well as 0.0.? The 190 hz error shows against my freq standard (10MHz) as well as my Siglent sig gen.? Zero beat is at 10,000,190. And when I'm listening to some SSB net on 20M, the best audio comes in at +190 hz (assuming they run the net on a whole freq).? Freq cal shows an error of 0.15Hz throughout the 20 min.? I adjust the cal factor to a freq error of 0.15Hz before I start cal.? I've run cal multiple time with the same results.? Everything is temp stabilized. 190 Hz isn't that bad but I'd like it to be close to zero.
?
?
?
?
|
Re: Updated 3rd Edition book NOT shipping from Amazon yet
Duane:
There should be no stock as it is a "Print on Demand" book. Tell then to check for Chapter 20, because earlier versions don't have a chapter 20.
Jack, W8TEE
On Wednesday, April 9, 2025 at 09:57:26 AM EDT, Duane B via groups.io <dbrantley@...> wrote:
Hi Jack.
?
I ordered it on April 5th.? It was delivered on the 8th.? I plan to return it.? Was going to give them a couple of days to deplete what stock they have.
?
Duane - K5CA
-- Jack, W8TEE
|
Re: T41 V9 troubleshooting guide
Thanks for all the replies.? I have downloaded and printed the Assembly manual that Greg linked (thanks!). ?? I'll let you know how progress is going with the resurrection of this T41.? I will be building my own with K9HZ's board set.
?
Duane - K5CA
|
Re: Updated 3rd Edition book NOT shipping from Amazon yet
Hi Jack.
?
I ordered it on April 5th.? It was delivered on the 8th.? I plan to return it.? Was going to give them a couple of days to deplete what stock they have.
?
Duane - K5CA
|
John Owens K1JO
jjpurdum
K9HZ