Date   
Re: Adjusting pa bias (RV3) blows one of the final #ubitx

Lawrence Galea
 

Apart from the suggestions by our friends, best is to use a current limited supply so that if it goes above the setting it will protect the set or use a car lamp in series with the supply which will also provide some protection.
As suggested a multi-turn pot is better to adjust the bias.
Happy weekend
Lawrence

On Fri, Nov 29, 2019 at 5:00 AM srivatsa KS <srivatsak.s@...> wrote:
Hi,

I'm trying to adjust pa bias on my ubitx v4 since 2days. Initial current consumption with both preset (RV3 and RV2) in clockwise position is 150mA. I turn bot preset fully clockwise.
I start with RV3 turning slowly anti-clockwise. Current with PTT on is 350ma to start with. As i start to turn the preset RV3. Some point of time current shoots up very fast and i stop.  By now the final is very hot.  At this point I don't have to press PTT,   current consumption in Recieve is 350ma. One of the Irf510(Q94) gets very hot in recieve itself. Most likely it's gone for toss. This the second time in frying it in past 2 days. Plese help!  Am i doing it the right way? I know the preset needs to be turned very slowly and I'm doubly sure I'm doing it extremely slow. Not sure what is wrong :( 

This doesn't happen with the other irf510 (Q95).  RV2 has is lesser gradient and can be easily turned easily to get a 100m amp more. 

Shouldn't RV3 have similar current gradient on Q94 as RV2 has on Q95 ?

Re: Adjusting pa bias (RV3) blows one of the final #ubitx

Jerry Gaffke
 

Raj is probably right about replacing the pot.

However, this is puzzling:
>  At this point I don't have to press PTT, current consumption in Recieve is 350ma.

I'd guess that you just blew Q94, and current will remain at 350 ma even after turning RV3 fully clockwise and/or turning power off and then back on.
If current during receive is 150ma initially, it should always be close to that when PTT is not pressed.

The TX power rail into pin 3 of U2 is 12v only when PTT is pressed for transmit, TX should be 0v when not pressed for receive.
So the gate (middle terminal) at Q94 should also be 0v during receive, and Q94 turned fully off (even though there is still 12v at Q94 drain).
If Q94 is conducting (and getting hot) when Q94 gate is 0v, then Q94 is blown and must be replaced.

There should be no current into the Q94 drain when RV3 is fully clockwise with PTT pressed.
That current increases at some point (around 3 or 4 volts at the gate of Q94) as you turn RV3.
If this is the case, then Q94 is probably ok.
.

Jerry, KE7ER

 

On Thu, Nov 28, 2019 at 11:03 PM, Raj vu2zap wrote:
If one of the bias adjust pot is slightly skewed then one of the leads below is cut
that is why you are not able to adjust bias. I recommend Bourn's multiturn preset
that is vertical for best results.

Raj

 

At 29/11/2019, you wrote:
Hi,

I'm trying to adjust pa bias on my ubitx v4 since 2days. Initial current consumption with both preset (RV3 and RV2) in clockwise position is 150mA. I turn bot preset fully clockwise.
I start with RV3 turning slowly anti-clockwise. Current with PTT on is 350ma to start with. As i start to turn the preset RV3. Some point of time current shoots up very fast and i stop. By now the final is very hot. At this point I don't have to press PTT, current consumption in Recieve is 350ma. One of the Irf510(Q94) gets very hot in recieve itself. Most likely it's gone for toss. This the second time in frying it in past 2 days. Plese help! Am i doing it the right way? I know the preset needs to be turned very slowly and I'm doubly sure I'm doing it extremely slow. Not sure what is wrong :(

This doesn't happen with the other irf510 (Q95). RV2 has is lesser gradient and can be easily turned easily to get a 100m amp more.

Shouldn't RV3 have similar current gradient on Q94 as RV2 has on Q95 ?

Re: Taa-Daa

Jack, W8TEE
 

Mornin' Jim:

Al and I have talked about this at length and, given what we read over the past 24 hours, I'm almost certain we will do SMD boards. I doubt we will do two versions of the boards and I also doubt that we will release the Gerber files. Al and I have invested 17 months and many 12 hour days working on the book and we know that our expected hourly wage will be somewhere around $0.50/hour. QRP Guys will be selling the boards at reasonable cost and it's one way that we might get some revenue from people who don't pay for the book. (My last two publishers agree that for every book I sell, 3 are ripped off through torrent sites.)

For those who may not have seen it, if you haven't tried working with SMD devices, I encourage you to spend $2 and buy a practice kit. This one is eBay 172645304752

Inline image

Our boards will use the 1206 sized SMD, which you can see their size in the above photo. I also think this video: How to Solder SMD Components!

 
is very good in showing what SMD are and how to solder them. As to the cost, a 2000 SMD resistor assortment with 50 values is less than $10. Caps are a little more expensive, but $10 still buys 320 pieces with about 16 different values. Electronic Parts Online Store - Tayda Electronics sells quantity 1 1206 resistors for $0.01 each and they are fairly fast


in shipping products as they have a warehouse in CO.

So, it's going to be SMD's. We'll know more about the costs when we start to get estimates on the boards, as their size will vary. We will also investigate boards with the SMD parts in place, which will leave only "large" pieces (e.g., IDC connectors, voltage regulators, etc.) left to do on the boards. That's a little riskier, since we have no idea which products will be the "most built". More on that much later.

Jack, W8TEE




On Friday, November 29, 2019, 1:50:11 AM EST, Jim Pruitt <jpruitt67@...> wrote:


Hello Jack.

Are you taking a poll?  You might actually make a Groups.io poll asking your question.  Yes,  I know, there will be lots of people that think they are participating in the poll by posting their comment and why they chose that particular thing but a poll would make it easier for you.

My vote is for smt pc boards but you might also consider making 2 versions, one through hole and the other as smt.  I know that would be more work but would appease both.  I am almost 71 years old and have no fear of smt (well, some fear anyway as I currently have a project -RadioBerry that uses a LFPGA144 Intel chip and a AD9866 QFN64 and no option to drag solder--and do not like drag soldering).  I well know that many parts are no longer available in through hole.  Many that are available are not stocked by DigiMouse or have a 10,000 minimum order (OK, usually 1000 but that is still more than most of us can afford--even if we had an outlet for the extra 999).  If we as a group start finding that projects are only available in smt versions then it might force us as a whole to embrace or at least try smt.  The other option would be to make the gerbers available (for the smt version) and tell us we can submit out orders to JLCSteeedPCBWay and request assembly (of the smt parts) and how to place that order since the smt parts would not normally be included in a board order but these outfits do assembly and preassembly...at a price.

I think if the various projects use SOCI8 chips that it would be easier for us old farts to figure out that it aint that bad!  I would not layout a board for the RadioBerry and its LFCSP144 (or whatever that 144 pin fpga is called) on a 5/8" square then we would all run in terror!

In summary, I vote for smt if both are not an option.  Even if it is an option I would still buy the smt version over the through hole because I know how hard it is getting to find many through hole parts.

Thank you.

Jim Pruitt
WA7DUY


On 11/28/2019 1:41 PM, jjpurdum via Groups.Io wrote:
While they are editing the book, Al and I will be making PCB's for all but the most trivial of the projects. One thing we go back and forth about is whether to do the boards for through-hole or SMD parts. We both want to do SMD, but we also know a lot of people are afraid of SMD's. My feeling: If, at my age, I can work with SMD's, anyone can. Also, the cost is significantly lower, too. On the other hand, a lot of hams won't even try to use an SMD board. It's not going to be a major revenue source for us anyway, so we're wondering what people actually want. Manufacturing an SMD board is a little less expensive and, ceteris paribus, can be a little smaller. I would be interested in hearing what the group thinks on the matter.

Jack, W8TEE

On Thursday, November 28, 2019, 2:03:37 PM EST, Gwen Patton <ardrhi@...> wrote:


It all looks wonderful, Jack! I'm looking forward to a couple of those, but mostly the luggable double-double. I want to build one, and mount it so I can hoist it on a mast held by a drive-on mast mount in my van. That way, I can operate from the van out in the field, from parks and such, and not have to get out in the weather. I have lots of radios I can take (and usually do), but I need to get or build a reasonable amp that can run off power from the van easily and safely. Maybe a 50W. With the remote control, that loop looks like exactly what I need, along with some of the wires I can hang from the same mast (when I'm not using the loop, of course).

I repurposed an Acer Chromebook CB3-111 for field use. I replaced the ChromeOS with GalliumOS, a distro of Linux based on Xubuntu. It works great, and I just got JS8Call working on it this morning. I've got FLDigi and FLRig installed, Qtel, a very well done Echolink client, and some various and sundry other programs, like a flavor of NEC for antenna modeling (which I still need to learn how to use), and a decent logger. I can tether it to my phone via WiFi and get on the Internet, and access QRZ for lookups -- my battery selection was such that I can also power the phone, and once I get a cable built for it, the Chromebook as well. It'll streamline my field ops a lot, reducing what I need to carry to do some serious operating!

I can't wait for that book to come out! It looks great, and you and Al deserve some serious applause for it.

73,
Gwen, NG3P

On Thu, Nov 28, 2019 at 1:44 PM jjpurdum via Groups.Io <jjpurdum=yahoo.com@groups.io> wrote:
All:

Most of you are aware that Al (AC8GY) and I are working on a sequel to the Projects book titled Microcontroller Projects for Amateur Radio. We changed the title because we have not limited ourselves to the Arduino family of processors, but include the STM32F1, ESP32, and the Teensy 4.0 controllers. All can be (and, for the book, are) programmed in the Arduino IDE using C. Today, Al and I finished writing the narrative for the last chapter of the book.

We have signed with the ARRL to publish the book, and one reason for signing with them is that they had enough faith to sign a contract with us, but allow us to finish all of the projects before submitting the chapters. That way, Al and I could work in the absence of a publisher breathing down our necks. That's the good news. The bad news is that, despite us beating our Jan 1, 2020, deadline, they are putting the new License manual ahead of us in the production queue. (Boo !) I asked if it would be ready by FDIM and they said no. That was a huge disappointment, but it is what it is. I'm still hopeful it will be out before the end of the second quarter of next year. Still, we feel like a 15 month stone has been lifted off our backs.

Anyway, what follows are some photos of most of the projects. I'll keep everyone posted on publishing details when I know them.

Jack, W8TEE
Al, AC8GY

two channel DSP (there's a preprocessor project, too)
Inline                                                           image
Signal generator, up to 30MHz.
Inline                                                           image

All kinds of test functions (i.e., different wave forms at various voltages)
Inline                                                           image

30W mini DL with watt meter (almost fits in a shirt pocket)
Inline                                                           image
Old computer PS redesigned for powering the projects.
Inline                                                           image
Morse Code Tutor (the subject of my FDIM presentation this year)
Inline                                                           image
Antenna tuner with SWR display and scan function (very useful for trimming antennas)
Inline                                                           image
Our Mag loop with remote controller (tested to 100' and used in Field Day).

Inline                                                           image




--

-+-+-+-+-
Jenny Everywhere's Infinite: Quark Time
http://quarktime.net


--
Jack, W8TEE

Re: Receive noise in just built version 5

Ian Reeve
 

The pay will almost certainly be a switch mode,server pay are normally quiet and I suggest making sure the bfo etc is correctly aligned.


From: BITX20@groups.io <BITX20@groups.io> on behalf of Morris Ford <morrishford@...>
Sent: Friday, November 29, 2019 12:51:03 PM
To: BITX20@groups.io <BITX20@groups.io>
Subject: Re: [BITX20] Receive noise in just built version 5
 
Thanks for your response. I really don't know about the power supply being a switcher. It is a supply salvaged from a HP server. I'll check on what type it is. I think I will connect the radio to a battery to see if any background noise goes away.

Morris
K7LSV


On Thu, Nov 28, 2019 at 11:47 AM Alberto via Groups.Io <albertopetruccelli=yahoo.com.ar@groups.io> wrote:
Do you have switching power supply ???

Rgds


El jue., 28 de nov. de 2019 a la(s) 12:16, howard winwood G4GPF
<winwoodh@...> escribió:
Do the BFO tune, you will find the difference amazing.

Re: Receive noise in just built version 5

Morris Ford <morrishford@...>
 

Thanks for your response. I really don't know about the power supply being a switcher. It is a supply salvaged from a HP server. I'll check on what type it is. I think I will connect the radio to a battery to see if any background noise goes away.

Morris
K7LSV


On Thu, Nov 28, 2019 at 11:47 AM Alberto via Groups.Io <albertopetruccelli=yahoo.com.ar@groups.io> wrote:
Do you have switching power supply ???

Rgds


El jue., 28 de nov. de 2019 a la(s) 12:16, howard winwood G4GPF
<winwoodh@...> escribió:
Do the BFO tune, you will find the difference amazing.

Re: Adjusting pa bias (RV3) blows one of the final #ubitx

srivatsa KS
 

Thanks Raj, yes it's skewed! I'll replace the pot with the Bourne multi turn and check. Thanks.

Re: Adjusting pa bias (RV3) blows one of the final #ubitx

 

If one of the bias adjust pot is slightly skewed then one of the leads below is cut
that is why you are not able to adjust bias. I recommend Bourn's multiturn preset
that is vertical for best results.

Raj

At 29/11/2019, you wrote:
Hi,

I'm trying to adjust pa bias on my ubitx v4 since 2days. Initial current consumption with both preset (RV3 and RV2) in clockwise position is 150mA. I turn bot preset fully clockwise.
I start with RV3 turning slowly anti-clockwise. Current with PTT on is 350ma to start with. As i start to turn the preset RV3. Some point of time current shoots up very fast and i stop. By now the final is very hot. At this point I don't have to press PTT, current consumption in Recieve is 350ma. One of the Irf510(Q94) gets very hot in recieve itself. Most likely it's gone for toss. This the second time in frying it in past 2 days. Plese help! Am i doing it the right way? I know the preset needs to be turned very slowly and I'm doubly sure I'm doing it extremely slow. Not sure what is wrong :(

This doesn't happen with the other irf510 (Q95). RV2 has is lesser gradient and can be easily turned easily to get a 100m amp more.

Shouldn't RV3 have similar current gradient on Q94 as RV2 has on Q95 ?

Re: Taa-Daa

Jack, W8TEE
 

Man, I wish they would up their dates, too, but they say that the license manuals are a huge revenue source for them, so I guess I understand. Still, I plan to "pleasantly" badger them if I can!

Jack, W8TEE

On Thursday, November 28, 2019, 5:26:57 PM EST, Tom, wb6b <wb6b@...> wrote:


What a great bunch of new projects. Congratulations!

Authors always amaze me. Some can write more books in their lifetime than a person could read in theirs. In this case you have more projects in one book than I'd probably have time to build in years.

The projects look like they have found a good balance between being pure software projects and actual hands-on electronics construction. Providing both software and circuit theory education through building them.

Maybe the ARRL will up their data rate and publish you book a bit sooner. (We could hope.)

Tom, wb6b
 

--
Jack, W8TEE

Adjusting pa bias (RV3) blows one of the final #ubitx

srivatsa KS
 

Hi,

I'm trying to adjust pa bias on my ubitx v4 since 2days. Initial current consumption with both preset (RV3 and RV2) in clockwise position is 150mA. I turn bot preset fully clockwise.
I start with RV3 turning slowly anti-clockwise. Current with PTT on is 350ma to start with. As i start to turn the preset RV3. Some point of time current shoots up very fast and i stop.  By now the final is very hot.  At this point I don't have to press PTT,   current consumption in Recieve is 350ma. One of the Irf510(Q94) gets very hot in recieve itself. Most likely it's gone for toss. This the second time in frying it in past 2 days. Plese help!  Am i doing it the right way? I know the preset needs to be turned very slowly and I'm doubly sure I'm doing it extremely slow. Not sure what is wrong :( 

This doesn't happen with the other irf510 (Q95).  RV2 has is lesser gradient and can be easily turned easily to get a 100m amp more. 

Shouldn't RV3 have similar current gradient on Q94 as RV2 has on Q95 ?

Re: Taa-Daa

Ashhar Farhan
 

Jack and Al,
What an fabulous body of work! I can see so many spin offs from these projects! Are there any parts of these projects that you could release online?
Congratulations and looking forward to reading it soon!
- f

On Fri 29 Nov, 2019, 12:09 AM Jack, W8TEE via Groups.Io, <jjpurdum=yahoo.com@groups.io> wrote:
All:

Most of you are aware that Al (AC8GY) and I are working on a sequel to the Projects book titled Microcontroller Projects for Amateur Radio. We changed the title because we have not limited ourselves to the Arduino family of processors, but include the STM32F1, ESP32, and the Teensy 4.0 controllers. All can be (and, for the book, are) programmed in the Arduino IDE using C. Today, Al and I finished writing the narrative for the last chapter of the book.

We have signed with the ARRL to publish the book, and one reason for signing with them is that they had enough faith to sign a contract with us, but allow us to finish all of the projects before submitting the chapters. That way, Al and I could work in the absence of a publisher breathing down our necks. That's the good news. The bad news is that, despite us beating our Jan 1, 2020, deadline, they are putting the new License manual ahead of us in the production queue. (Boo !) I asked if it would be ready by FDIM and they said no. That was a huge disappointment, but it is what it is. I'm still hopeful it will be out before the end of the second quarter of next year. Still, we feel like a 15 month stone has been lifted off our backs.

Anyway, what follows are some photos of most of the projects. I'll keep everyone posted on publishing details when I know them.

Jack, W8TEE
Al, AC8GY

two channel DSP (there's a preprocessor project, too)
Signal generator, up to 30MHz.

All kinds of test functions (i.e., different wave forms at various voltages)

30W mini DL with watt meter (almost fits in a shirt pocket)

Old computer PS redesigned for powering the projects.

Morse Code Tutor (the subject of my FDIM presentation this year)

Antenna tuner with SWR display and scan function (very useful for trimming antennas)

Our Mag loop with remote controller (tested to 100' and used in Field Day).





--
Jack, W8TEE

Re: For Sale: BITX40 and µBITX

MadRadioModder
 

Yeah.  Who is writing the CAT control?  


MRM

 


On Nov 28, 2019, at 5:18 PM, Jack, W8TEE via Groups.Io <jjpurdum@...> wrote:


JackAl does not have CAT control, but since you have the source and lots of memory resources, there's no reason it can't be added.

Jack, W8TEE

On Thursday, November 28, 2019, 3:12:30 PM EST, Goran Skular <goran.skular@...> wrote:


I am waiting for a new ubitx.. ordered yesterday.

And soon I will order jackAl for it (orders are closed now).

I have some questions though..

Is it better to wait for an upgraded jackal with a new teensy?

Also, does JackAl provide both audio and serial cat control through USB connection (teensy can emulate more usb devices when connected to pc.. bit I don't know if it is supported with jackal fw)?

--
Jack, W8TEE

--

…_. _._

Re: Taa-Daa

Tom, wb6b
 

What a great bunch of new projects. Congratulations!

Authors always amaze me. Some can write more books in their lifetime than a person could read in theirs. In this case you have more projects in one book than I'd probably have time to build in years.

The projects look like they have found a good balance between being pure software projects and actual hands-on electronics construction. Providing both software and circuit theory education through building them.

Maybe the ARRL will up their data rate and publish you book a bit sooner. (We could hope.)

Tom, wb6b
 

Re: Book TOC

Jack, W8TEE
 

Thanks, Robert. Without the usual publishing pressures, this was a fun book to write.

Some of you have written privately about the Table of Contents. It is as follows:

0. Foreword
1. Introduction – Which µC and Installation and Intro to the IDE
2. An Overview of Arduino C
3. Libraries and a Gentle Introduction to Object Oriented Programming
4. Displays – 2x16 LCD, TFT, OLED, Menuing system
5. High-current Utility Power Supply
6. Mini Dummy Load with Power
7. Morse Code Tutor
8. Unique Programmable Bench Power Supply

9. Antenna Tuner
10. CW Messenger

11. DSP Post Processor
12. DSP Mic Processor
13. Signal Generator
14. Constructing the “Luggable Double Double” Magnetic Loop Antenna
15. Remote Control for the Luggable Double-Double Mag Loop
16. How to Make you Project Look Professional


Jack, W8TEE



On Thursday, November 28, 2019, 4:32:57 PM EST, Robert Freeman <michmasher@...> wrote:


Very nice work.  I’m appreciative of your contributions that help us all to learn. 

Warm regards,

Robert, NQ0T 

--
Jack, W8TEE

Re: Taa-Daa

Robert Freeman
 

Very nice work.  I’m appreciative of your contributions that help us all to learn. 

Warm regards,

Robert, NQ0T 

Re: Taa-Daa

Jack, W8TEE
 

The problem with the new Teensy (T4) is that its small size forced some of the I/O pins to be moved to the bottom side of the board. That would entail a total redesign of the JackAl board because we use a lot of pins on it. Some of the JackAl functionality is separated out into projects in the new book. JackAl is probably more cost effective, since it combines that functionality into one board, plus add features we don't cover in the book.

Jack, W8TEE

On Thursday, November 28, 2019, 2:57:44 PM EST, Goran Skular <goran.skular@...> wrote:


Perfect. Congratulations!

Why not include JackAl also?

BTW, I can't wait to order one.. or maybe wait for new teensy version :)

On Thu, 28 Nov 2019, 19:39 Jack, W8TEE via Groups.Io, <jjpurdum=yahoo.com@groups.io> wrote:
All:

Most of you are aware that Al (AC8GY) and I are working on a sequel to the Projects book titled Microcontroller Projects for Amateur Radio. We changed the title because we have not limited ourselves to the Arduino family of processors, but include the STM32F1, ESP32, and the Teensy 4.0 controllers. All can be (and, for the book, are) programmed in the Arduino IDE using C. Today, Al and I finished writing the narrative for the last chapter of the book.

We have signed with the ARRL to publish the book, and one reason for signing with them is that they had enough faith to sign a contract with us, but allow us to finish all of the projects before submitting the chapters. That way, Al and I could work in the absence of a publisher breathing down our necks. That's the good news. The bad news is that, despite us beating our Jan 1, 2020, deadline, they are putting the new License manual ahead of us in the production queue. (Boo !) I asked if it would be ready by FDIM and they said no. That was a huge disappointment, but it is what it is. I'm still hopeful it will be out before the end of the second quarter of next year. Still, we feel like a 15 month stone has been lifted off our backs.

Anyway, what follows are some photos of most of the projects. I'll keep everyone posted on publishing details when I know them.

Jack, W8TEE
Al, AC8GY

two channel DSP (there's a preprocessor project, too)
Inline image
Signal generator, up to 30MHz.
Inline image

All kinds of test functions (i.e., different wave forms at various voltages)
Inline image

30W mini DL with watt meter (almost fits in a shirt pocket)
Inline image
Old computer PS redesigned for powering the projects.
Inline image
Morse Code Tutor (the subject of my FDIM presentation this year)
Inline image
Antenna tuner with SWR display and scan function (very useful for trimming antennas)
Inline image
Our Mag loop with remote controller (tested to 100' and used in Field Day).

Inline image



--
Jack, W8TEE

--
Jack, W8TEE

Re: For Sale: BITX40 and µBITX

Jack, W8TEE
 

JackAl does not have CAT control, but since you have the source and lots of memory resources, there's no reason it can't be added.

Jack, W8TEE

On Thursday, November 28, 2019, 3:12:30 PM EST, Goran Skular <goran.skular@...> wrote:


I am waiting for a new ubitx.. ordered yesterday.

And soon I will order jackAl for it (orders are closed now).

I have some questions though..

Is it better to wait for an upgraded jackal with a new teensy?

Also, does JackAl provide both audio and serial cat control through USB connection (teensy can emulate more usb devices when connected to pc.. bit I don't know if it is supported with jackal fw)?

--
Jack, W8TEE

Re: Taa-Daa

Mark Hatch
 

Oh wow! Better get the JackAl done so I have room. What a great set of projects. Thank you!

73
Mark
AJ6CU

Re: For Sale: BITX40 and µBITX

Goran Skular
 

I am waiting for a new ubitx.. ordered yesterday.

And soon I will order jackAl for it (orders are closed now).

I have some questions though..

Is it better to wait for an upgraded jackal with a new teensy?

Also, does JackAl provide both audio and serial cat control through USB connection (teensy can emulate more usb devices when connected to pc.. bit I don't know if it is supported with jackal fw)?

Re: Taa-Daa

Goran Skular
 

Perfect. Congratulations!

Why not include JackAl also?

BTW, I can't wait to order one.. or maybe wait for new teensy version :)


On Thu, 28 Nov 2019, 19:39 Jack, W8TEE via Groups.Io, <jjpurdum=yahoo.com@groups.io> wrote:
All:

Most of you are aware that Al (AC8GY) and I are working on a sequel to the Projects book titled Microcontroller Projects for Amateur Radio. We changed the title because we have not limited ourselves to the Arduino family of processors, but include the STM32F1, ESP32, and the Teensy 4.0 controllers. All can be (and, for the book, are) programmed in the Arduino IDE using C. Today, Al and I finished writing the narrative for the last chapter of the book.

We have signed with the ARRL to publish the book, and one reason for signing with them is that they had enough faith to sign a contract with us, but allow us to finish all of the projects before submitting the chapters. That way, Al and I could work in the absence of a publisher breathing down our necks. That's the good news. The bad news is that, despite us beating our Jan 1, 2020, deadline, they are putting the new License manual ahead of us in the production queue. (Boo !) I asked if it would be ready by FDIM and they said no. That was a huge disappointment, but it is what it is. I'm still hopeful it will be out before the end of the second quarter of next year. Still, we feel like a 15 month stone has been lifted off our backs.

Anyway, what follows are some photos of most of the projects. I'll keep everyone posted on publishing details when I know them.

Jack, W8TEE
Al, AC8GY

two channel DSP (there's a preprocessor project, too)
Signal generator, up to 30MHz.

All kinds of test functions (i.e., different wave forms at various voltages)

30W mini DL with watt meter (almost fits in a shirt pocket)

Old computer PS redesigned for powering the projects.

Morse Code Tutor (the subject of my FDIM presentation this year)

Antenna tuner with SWR display and scan function (very useful for trimming antennas)

Our Mag loop with remote controller (tested to 100' and used in Field Day).





--
Jack, W8TEE

Re: Receive noise in just built version 5

MadRadioModder
 

Usually works.  They are not calibrated from the mfgr and rarely work right out of the box. 


MRM

 


On Nov 28, 2019, at 2:39 PM, Morris Ford <morrishford@...> wrote:


Thanks. I did  a quick BFO calibrate and I now hear SSB and dig signals. Not perfect now but I know it will work.

Morris
 K7LSV



On Thu, Nov 28, 2019 at 8:11 AM MadRadioModder <madradiomodder@...> wrote:
Calibrate!


MRM

 


On Nov 28, 2019, at 9:05 AM, Morris Ford <morrishford@...> wrote:

I have a high intensity noise on receive. It almost completely covers any signals, I can hear what I think is sideband under the noise. It is a buzzing kind of sound at medium to high frequency.
Volume control works, tuning works, menu access works, have not tried transmit yet.
Noise is present with antenna connected, goes away with no antenna. Same antenna, different radio, no problem.
Ubitx and different antenna still have same noise.
Different power supply, same noise.
Have not done any calibration.

Where do I start?
Any assistance gratefully accepted.

Thanks.
Morris
K7LSV


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