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Latest DSP and SDR book color images

 

Were the new color images uploaded anywhere? I found the old book's images, but they aren't the same.
John K1JO
Re: Restructuring the T41 code

 

I must say as not yet retired EE, still have a few years before I earn that privilege.
?
I have dabbled in C several times over my career from university and onwards, back then the standard book was "The C Programming Language", by Brian Kernighan?and?Dennis Ritchie. Still a great reference book, but not really directly relevant to Arduino or Teensy. I think the best thing about programming now is the numerous libraries and functions available at your fingertips nowadays, that wasn't the case back when I was at university, the internet was still maturing - GitHub is a new millennium invention.
?
I've found it's the old "use it or lose it" paradigm, it's quite hard to maintain the C skills without using them regularly on top of all the other regularly used skills as an EE. I've also tried Python and JavaScript but lost most of that knowledge quickly. I hope to spend more time in the "developers world" myself, let's see how that goes.
?
All the best John on your journey.
?
Regards
Phil VK2KKZ
Re: t41 main board j22 connections

 

I am happy to send you a premade cable.?
I have a few from RC flying days.
My gift no charge?
PM me?
Tim
Re: t41 main board j22 connections

 

¿ªÔÆÌåÓý

John,

It is a three wire connector to the piggyback audio hat. I believe the hat is labeled L G R or R G L on the audio hat bottom.? That is the audio out of the top hat for transmit audio.? Discussed on page 1 of the assembly manual, item 3.? Hope that helps.

Rick, KN4AIE

?

From: [email protected] <[email protected]> On Behalf Of john rader via groups.io
Sent: Tuesday, April 29, 2025 7:00 PM
To: [email protected]
Subject: [SoftwareControlledHamRadio] t41 main board j22 connections

?

I have looked at all schematics and construction files, where is the j22 connector on main board connect to?

Re: t41 main board j22 connections

 

sorry I finally found it with search.

t41 main board j22 connections

 

I have looked at all schematics and construction files, where is the j22 connector on main board connect to?

Re: FW 66.9 bug

 

I would put All my default values in for the defaults,

Jack, W8TEE

On Tuesday, April 29, 2025 at 03:20:30 PM EDT, jerry-KF6VB <jerry@...> wrote:


On 2025-04-23 13:44, Oliver KI3P via groups.io wrote:

> reset the flash. This will delete all your calibration parameters,
> unfortunately, so only do it as a last resort.

I got tired of doing calibrations over & over - especially the transmit
IQ cal.
So I have gotten into the habit of modifying EEPROM.c to put my
calibration numbers
into the defaults.

? ? ? ? ? ? ? - Jerry, KF6VB






--
Jack, W8TEE
Re: FW 66.9 bug

 

On 2025-04-23 13:44, Oliver KI3P via groups.io wrote:

reset the flash. This will delete all your calibration parameters,
unfortunately, so only do it as a last resort.
I got tired of doing calibrations over & over - especially the transmit IQ cal.
So I have gotten into the habit of modifying EEPROM.c to put my calibration numbers
into the defaults.

- Jerry, KF6VB
Re: Restructuring the T41 code

 

Thanks, Phil!

Jack, W8TEE

On Tuesday, April 29, 2025 at 02:32:35 PM EDT, Phil Taylor via groups.io <philbyt1@...> wrote:


[Edited Message Follows]

John
?
Also Amazon 1484209419 is a very detailed beginner guide to C. I have found it to be excellent. Yet another great book by Jack.
?
Regards
Phil VK2KKZ

--
Jack, W8TEE
Re: FT8

 

Thanks Bill

On Tue, Apr 29, 2025 at 1:10?PM K9HZ via <bill=[email protected]> wrote:

Terrance and John Melton have both implemented CAT control¡­ they can tell you how it works.? There was also some talk of getting audio over USB in For CODEC but I¡¯m not sure where that is¡­

?

?

Dr. William J. Schmidt - K9HZ J62K(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 D Solt via
Sent: Tuesday, April 29, 2025 12:08 PM
To: [email protected]
Subject: [SoftwareControlledHamRadio] FT8

?

My T41 is working great.? Thank you to all that have helped me.? I need some more? help to use the T41 V12 on FT8.? Do I need an external sound card?? Is there CAT implemented?

dave, n3ds
Re: Restructuring the T41 code

 
Edited

John
?
Also Amazon 1484209419 is a very detailed beginner guide to C. I have found it to be excellent. Yet another great book by Jack.
?
Regards
Phil VK2KKZ
Re: FT8

 

¿ªÔÆÌåÓý

Terrance and John Melton have both implemented CAT control¡­ they can tell you how it works.? There was also some talk of getting audio over USB in For CODEC but I¡¯m not sure where that is¡­

?

?

Dr. William J. Schmidt - K9HZ J62K(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 D Solt via groups.io
Sent: Tuesday, April 29, 2025 12:08 PM
To: [email protected]
Subject: [SoftwareControlledHamRadio] FT8

?

My T41 is working great.? Thank you to all that have helped me.? I need some more? help to use the T41 V12 on FT8.? Do I need an external sound card?? Is there CAT implemented?

dave, n3ds
FT8

 

My T41 is working great.? Thank you to all that have helped me.? I need some more? help to use the T41 V12 on FT8.? Do I need an external sound card?? Is there CAT implemented?
dave, n3ds
Re: Restructuring the T41 code

 

Hi John:

If you want some help learning C, take a look at Amazon B08GCVV6TG. Obviously, I'm biased, but read several of the reviews and see if you think it might help. I suggested this book over some others because if does talk about the Teensy, which is used in? the T41.

Jack, W8TEE

On Tuesday, April 29, 2025 at 04:59:16 AM EDT, John G0SDF via groups.io <jatkins295@...> wrote:


This is fantastic Oliver! I am a retired EE. I have limited knowledge or experience with software and programming code, but I know all about state machines and I am wanting to learn C programming with the aid of T41-EP. I am particularly interested in the visual diagram because this will help tremendously when I come to design and implement my own functions and button mapping into the code.
Keep up the good work!
?
John, G0SDF

--
Jack, W8TEE
Re: Restructuring the T41 code

 

This is fantastic Oliver! I am a retired EE. I have limited knowledge or experience with software and programming code, but I know all about state machines and I am wanting to learn C programming with the aid of T41-EP. I am particularly interested in the visual diagram because this will help tremendously when I come to design and implement my own functions and button mapping into the code.
Keep up the good work!
?
John, G0SDF
Re: V11 40MHz?

 

My V11 doesn't work beyond about 32 MHz...


Dr. William J. Schmidt - K9HZ J62K(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: www.VillaGrandPiton.com

Moderator: North American QRO Group at Groups.IO.
Moderator: Amateur Radio Builders Group at Groups.IO.

email:? bill@...

-----Original Message-----
From: [email protected]
<[email protected]> On Behalf Of jerry-KF6VB
Sent: Monday, April 28, 2025 1:05 PM
To: [email protected]
Subject: [SoftwareControlledHamRadio] V11 40MHz?

Hello All,

When I moved from V11 to V12, I did not take apart my V11 boards, or
cannibalize them in any way. Now, I might have a use for them.

I've been a ham since 1970, and I have a weakness for the rigs I drooled
over back then and could not dream of affording. My current acquisition in
that vein is a Signal/One CX7A. In 1970, this was the fanciest ham rig you
could buy. It was ahead of its time, and really too expensive.
The
radio is big, sized for adults, lots of knobs.... Of course, time has caught
up with it, and any old IC7300 will blow it out of the water, feature-wise.

One big thing that any radio of that vintage lacks, is a spectrum scope
and waterfall. Simply not doable with 1968 technology.

The radio does an initial upconversion to 39-40MHz. There's an RCA jack
on the back that outputs that signal.

Just for yuks, I hooked up my T41 V12 to that output - it showed a
beautiful spectrum. Waterfall & everything. Only the frequencies were
backward - lowest frequency at the left, highest at the right. And no pip
showing to where the radio is tuned.

I'm thinking that my V11 boards could be repurposed into a spectrum scope
for the Signal/One. I'd just need the Main board and the RF board and a
display. I don't remember if the V11 will go that high...

- Jerry, KF6VB
Re: T41-2 and K9HZ Power Amplifier Measurements

 

Thanks Greg for your clear description of the measurement systems you are using to evaluate available RF power amplifiers suitable for use with the T41 and other equipment.

?

As your videos confirm, it is essential that any quoted measurements and specifications are as accurate and understandable as possible.? Your videos and results suggest that the actual performance of some amplifiers falls well below their claimed specifications.

?

You have explained qualifiers? such as Average Power, Peak Power, PEP and others which is very helpful.? ?

?

We may call ourselves ¡°Radio Amateurs¡± or ¡°Hams¡± but we should ?still be bound by the professional unit standards which we accept and respect.?? For power, the standard unit is the ¡°Watt¡± and a common definition is based on the heating effect of the power applied to an object such as a dummy load or an aerial.? The ¡°power applied to an object¡± may be driven by mechanical energy, electrical energy or other forms of energy.

?

On one occasion when I doubted my shack RF power meter, I placed my dummy load in a well insulated bath of water and noted the rate of rise of temperature.? After some measurements and calculations, I was re-assured that my RF power meter was? in the right ball park.

My point is that if something is referred to as a 10, 20, 50 or whatever Watt amplifier then that is the minimum it must deliver and there should be no ambiguity in the meaning of any values quoted.

Harry? GM3RVL
V11 40MHz?

 

Hello All,

When I moved from V11 to V12, I did not take apart my V11 boards, or cannibalize them in any way. Now, I might have a use for them.

I've been a ham since 1970, and I have a weakness for the rigs I drooled over back then and could not dream of affording. My current acquisition
in that vein is a Signal/One CX7A. In 1970, this was the fanciest ham rig you could buy. It was ahead of its time, and really too expensive. The
radio is big, sized for adults, lots of knobs.... Of course, time has caught up with it, and any old IC7300 will blow it out of the water, feature-wise.

One big thing that any radio of that vintage lacks, is a spectrum scope and waterfall. Simply not doable with 1968 technology.

The radio does an initial upconversion to 39-40MHz. There's an RCA jack on the back that outputs that signal.

Just for yuks, I hooked up my T41 V12 to that output - it showed a beautiful spectrum. Waterfall & everything. Only the frequencies were backward -
lowest frequency at the left, highest at the right. And no pip showing to where the radio is tuned.

I'm thinking that my V11 boards could be repurposed into a spectrum scope for the Signal/One. I'd just need the Main board and the RF board and a
display. I don't remember if the V11 will go that high...

- Jerry, KF6VB
Re: More T41 V12 Results

 

¿ªÔÆÌåÓý

OF course.

?

?

Dr. William J. Schmidt - K9HZ J62K(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 Nate Reik N8BTR via groups.io
Sent: Sunday, April 27, 2025 9:33 PM
To: [email protected]
Subject: Re: [SoftwareControlledHamRadio] More T41 V12 Results

?

Bill,?

? ? I think this makes a lot of sense to design this way when others are building and operating! I appreciate you commenting, good to know that was the mindset in your design. I've been trying to learn more about HF amplifier design, so I may ask more questions as I build mine, but understanding that I'm....at my own risk for any deviations I choose to make!

?

-Nate

N8BTR
Re: More T41 V12 Results

 

Bill,?
? ? I think this makes a lot of sense to design this way when others are building and operating! I appreciate you commenting, good to know that was the mindset in your design. I've been trying to learn more about HF amplifier design, so I may ask more questions as I build mine, but understanding that I'm....at my own risk for any deviations I choose to make!
?
-Nate
N8BTR
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