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Re: Relay for antenna tuner output?

Arv Evans
 

Bob  N1KPR

Using a switch to connect to either dummy load or antenna is a good idea.  It should help eliminate errors where the rig is not connected to anything.  

Arv  K7HKL
_._


On Sun, Aug 23, 2020 at 6:42 AM Bob, N1KPR <rwbetts@...> wrote:
I'm using a chassis mounted dummy load which is selected via a toggle switch. This is handy for adjusting the SWR and Power meters. Then when I switch to the antenna I can see the real SWR and power output to the antenna line.
You can see it on my video at around the 3:30 minute mark.
Bob, N1KPR





Re: Content flagged as objectionable

Robert D. Bowers
 

Considering the almost ubiquitous presence of microprocessors in amateur radio, and the presence of the Raduino in the more recent versions of BitX, I cannot understand why something as foundational as the programming language (or languages) involved in the operation of the radio would be considered objectionable.

I learned (self-taught) C decades ago, and although I am VERY rusty at it (I probably would even have to look up some coding tips for anything even slightly more complex than "Hello World!"), learning C still has greatly helped me to go through code - I can understand what I'm reading (as long as it's not TOO complex).  In fact, if you wrote any beginning C books in the early 90s, I may have used your book!  ("Learn C in X days" - the title was something like that, and I think I still have it along with the software disk - hidden away somewhere!)

Too bad the Arduinos weren't available back in the mid 70s when I first learned programming... they'd have made some dreams possible!

As far as objectionable - some flexibility and 'leeway' is always a good thing.  One person's "off topic" might be right on topic to others!

Bob
N4FBZ


On 8/23/20 9:51 AM, Jack, W8TEE via groups.io wrote:
Hi Evan:

Thanks for taking the time to write and the kind words...they are appreciated.

I can say that our editors at the ARRL have told me that they expect the Projects book to be printed on Sept. 18. I really don't know what that means in terms of selling the book. I'd suggest people just go to the web site (arrl.org) after that date and check their store for info.

Thanks again!

Jack, W8TEE

On Sunday, August 23, 2020, 9:40:27 AM EDT, Evan Hand <elhandjr@...> wrote:


Jack,
My vote would be to continue to post your messages, as one of the most posted problems (outside of the audio input and receiver sensitivity issues) is on how to upgrade the microcontroller in the Raduino.   This is not based on any detailed data tracking, rather on my reading the majority of posts on this board.  If anything is out of the scope of the board, it would be the discussion of MOPA, as these are not related to the bidirectional heterodyne design of the uBITX or andy of the BITX that I am aware of.  Even those posts are OK for me, as I learn from all of them.

BTW, I did purchase your book and have started reading it.  This even though I have multiple years of other systems programming (mostly industrial PLCs and other languages), and have dabbled in the Arduino and Raspberry Pi devices.  I learned somethings in the first two chapters, so already worth the $10 on the Kindle site.

Again, please continue to post, and to write teaching-focused programming books.  I look forward to the ARRL publication when it becomes available.
73
Evan
AC9TU

--
Jack, W8TEE


Re: Content flagged as objectionable

Arv Evans
 


1920's era transmitter design.




_._

On Sun, Aug 23, 2020 at 12:02 AM <s53c.lado@...> wrote:

I apologize to reply to your message with an off topic question. Since English (American) is not my native language, I sometimes don't understand some references. I can relate to your mention of both one tube radios and 807 finals (I built both at age of 13), but I'd be glad if you explain what you mean by "MOPA design". I googled about that a little bit, but failed to find a meaningful explanation.

If I return to the topic, I absolutely agree with you that ham radio nowadays requires al least basic understanding of micro controllers and programming. Although C and C++ are not the only programming languages, they seem to be most used ones in micro controller area. Thus any kind of reference to Jack Purdum books covering C, C++ and ham radio are and should be most welcome in Bitx forums!


Re: uBitx V6 . 2 board connectors #ubitxv6 #ubitx-help

Bill
 


Re: Content flagged as objectionable

Jack, W8TEE
 

Hi Evan:

Thanks for taking the time to write and the kind words...they are appreciated.

I can say that our editors at the ARRL have told me that they expect the Projects book to be printed on Sept. 18. I really don't know what that means in terms of selling the book. I'd suggest people just go to the web site (arrl.org) after that date and check their store for info.

Thanks again!

Jack, W8TEE

On Sunday, August 23, 2020, 9:40:27 AM EDT, Evan Hand <elhandjr@...> wrote:


Jack,
My vote would be to continue to post your messages, as one of the most posted problems (outside of the audio input and receiver sensitivity issues) is on how to upgrade the microcontroller in the Raduino.   This is not based on any detailed data tracking, rather on my reading the majority of posts on this board.  If anything is out of the scope of the board, it would be the discussion of MOPA, as these are not related to the bidirectional heterodyne design of the uBITX or andy of the BITX that I am aware of.  Even those posts are OK for me, as I learn from all of them.

BTW, I did purchase your book and have started reading it.  This even though I have multiple years of other systems programming (mostly industrial PLCs and other languages), and have dabbled in the Arduino and Raspberry Pi devices.  I learned somethings in the first two chapters, so already worth the $10 on the Kindle site.

Again, please continue to post, and to write teaching-focused programming books.  I look forward to the ARRL publication when it becomes available.
73
Evan
AC9TU

--
Jack, W8TEE


Re: Content flagged as objectionable

Evan Hand
 

Jack,
My vote would be to continue to post your messages, as one of the most posted problems (outside of the audio input and receiver sensitivity issues) is on how to upgrade the microcontroller in the Raduino.   This is not based on any detailed data tracking, rather on my reading the majority of posts on this board.  If anything is out of the scope of the board, it would be the discussion of MOPA, as these are not related to the bidirectional heterodyne design of the uBITX or andy of the BITX that I am aware of.  Even those posts are OK for me, as I learn from all of them.

BTW, I did purchase your book and have started reading it.  This even though I have multiple years of other systems programming (mostly industrial PLCs and other languages), and have dabbled in the Arduino and Raspberry Pi devices.  I learned somethings in the first two chapters, so already worth the $10 on the Kindle site.

Again, please continue to post, and to write teaching-focused programming books.  I look forward to the ARRL publication when it becomes available.
73
Evan
AC9TU


Re: Relay for antenna tuner output?

Bob, N1KPR
 

I'm using a chassis mounted dummy load which is selected via a toggle switch. This is handy for adjusting the SWR and Power meters. Then when I switch to the antenna I can see the real SWR and power output to the antenna line.
You can see it on my video at around the 3:30 minute mark.
Bob, N1KPR





Re: Content flagged as objectionable

Jack, W8TEE
 

All:

I knew that there would be some objections to my post about my new book, which is why I put the warning in the tag line. Truthfully, there were a number of people who knew I was working on it and wrote privately and asked me to inform them when it was done. I started an email list and I know it's on my system "somewhere", but I cannot find it. Alas, I'm getting to the age where I can have my own Easter Egg Hunt.

The post was the easiest way to reach those who were interested, but unfortunately, I also reached a lot of members who were not interested. To those of you who fall in the latter group, I sincerely apologize.

Jack, W8TEE

On Sunday, August 23, 2020, 2:02:49 AM EDT, s53c.lado@... <s53c.lado@...> wrote:


I apologize to reply to your message with an off topic question. Since English (American) is not my native language, I sometimes don't understand some references. I can relate to your mention of both one tube radios and 807 finals (I built both at age of 13), but I'd be glad if you explain what you mean by "MOPA design". I googled about that a little bit, but failed to find a meaningful explanation.

If I return to the topic, I absolutely agree with you that ham radio nowadays requires al least basic understanding of micro controllers and programming. Although C and C++ are not the only programming languages, they seem to be most used ones in micro controller area. Thus any kind of reference to Jack Purdum books covering C, C++ and ham radio are and should be most welcome in Bitx forums!


--
Jack, W8TEE


Re: Content flagged as objectionable

Bill Cromwell
 

Hi Barry,

That single tube transmitter is known as a power oscillator and is not a MOPA design. It is useful in defining anything to point out what it is not. The example with the buffer/muliplier IS a MOPA design even if there are more than two or three tubes (keyers, etc). A heterodyne transmitter that mixes output from two (or more) oscillators to arrive at the output frequency is also not a MOPA. The simplest MOPA has two tubes. MOPA transmitters may also be solid state.

73,

Bill KU8H

bark less - wag more

On 8/23/20 7:27 AM, barry halterman wrote:
A one tube transmitter with a single 6146 was a popular design in the early 1960s.
Barry


Re: Content flagged as objectionable

barry halterman
 

A one tube transmitter with a single 6146 was a popular design in the early 1960s.
Barry


On Sun, Aug 23, 2020, 6:25 AM Bob Lunsford via groups.io <nocrud222=yahoo.com@groups.io> wrote:
On Sunday, August 23, 2020, 2:02:49 AM EDT, s53c.lado@... <s53c.lado@...> wrote:


I apologize to reply to your message with an off topic question. Since English (American) is not my native language, I sometimes don't understand some references. I can relate to your mention of both one tube radios and 807 finals (I built both at age of 13), but I'd be glad if you explain what you mean by "MOPA design". I googled about that a little bit, but failed to find a meaningful explanation.

If I return to the topic, I absolutely agree with you that ham radio nowadays requires al least basic understanding of micro controllers and programming. Although C and C++ are not the only programming languages, they seem to be most used ones in micro controller area. Thus any kind of reference to Jack Purdum books covering C, C++ and ham radio are and should be most welcome in Bitx forums!


Integration of uBitx V6 board with Nextion kit from https://amateurradiokits.in/ #ubitxv6 #nextion

vu3gwn
 

Has anyone integrated uBitx V6 board with the kit from https://amateurradiokits.in/. Since the power /volume control, ptt, audio out and cw key along with Antenna connectors are soldered on the board unlike the V5 board, wanted to check how it has been handled. The kit is currently not compatible with V6 board. 

If anyone can share their experiences and or some photos how the integration has been done, it will help.

Thanks


Re: Content flagged as objectionable

Bob Lunsford
 

On Sunday, August 23, 2020, 2:02:49 AM EDT, s53c.lado@... <s53c.lado@...> wrote:


I apologize to reply to your message with an off topic question. Since English (American) is not my native language, I sometimes don't understand some references. I can relate to your mention of both one tube radios and 807 finals (I built both at age of 13), but I'd be glad if you explain what you mean by "MOPA design". I googled about that a little bit, but failed to find a meaningful explanation.

If I return to the topic, I absolutely agree with you that ham radio nowadays requires al least basic understanding of micro controllers and programming. Although C and C++ are not the only programming languages, they seem to be most used ones in micro controller area. Thus any kind of reference to Jack Purdum books covering C, C++ and ham radio are and should be most welcome in Bitx forums!


Re: kit-projects AGC with uBITX v5 - need help #v5

Vic WA4THR
 

I have a V4 and use and entirely different AGC system, so I can't help directly. There was at least one instance of that AGC board not working, which may have been due to a failed component, and an update to pull the AGC voltage from a different part of the circuit, not the Vol-H pin, that may be of use. See the following message:

https://groups.io/g/BITX20/message/69343?p=,,,20,0,0,0::Created,,kit+projects+v4+agc,20,2,0,31881810

=Vic=


Re: Content flagged as objectionable

 

We used 0A3/VR75 or 0B3 type of tubes not OA79 (typo)..


At 23/08/2020, you wrote:
Lado,
MOPA refers to a simple transmitter design that had a MASTER OSCILLATOR (MO) followed by a POWER AMPLIFIER (PA). Very often these were tubes like the 12BY7 as the oscillator followed by a beer bottle 807 as the power amplifier.Â
In india, a common design was to run the oscillator at 7 Mhz from an EF91, that was stabilized with an OA79. This was followed by a doubler/driver to 14 and a power amplifier on one or two 807s. This pushed out about 100 watts of CW.
- f

On Sun, Aug 23, 2020 at 11:32 AM <s53c.lado@...> wrote:


Re: Content flagged as objectionable

Terry VK5TM
 

Lado,

If you search using the term 'MOPA ham radio' you will get much better results to explain MOPA.

And I agree with everyone else in that there is a lot of crossover between micro processors, software and ham radio that mention of Jack's books makes sense in this forum to me.
--
https://www.vk5tm.com


Re: Content flagged as objectionable

Ashhar Farhan
 

Lado,
MOPA refers to a simple transmitter design that had a MASTER OSCILLATOR (MO) followed by a POWER AMPLIFIER (PA). Very often these were tubes like the 12BY7 as the oscillator followed by a beer bottle 807 as the power amplifier. 
In india, a common design was to run the oscillator at 7 Mhz from an EF91, that was stabilized with an OA79. This was followed by a doubler/driver to 14 and a power amplifier on one or two 807s. This pushed out about 100 watts of CW.
- f

On Sun, Aug 23, 2020 at 11:32 AM <s53c.lado@...> wrote:

I apologize to reply to your message with an off topic question. Since English (American) is not my native language, I sometimes don't understand some references. I can relate to your mention of both one tube radios and 807 finals (I built both at age of 13), but I'd be glad if you explain what you mean by "MOPA design". I googled about that a little bit, but failed to find a meaningful explanation.

If I return to the topic, I absolutely agree with you that ham radio nowadays requires al least basic understanding of micro controllers and programming. Although C and C++ are not the only programming languages, they seem to be most used ones in micro controller area. Thus any kind of reference to Jack Purdum books covering C, C++ and ham radio are and should be most welcome in Bitx forums!


Re: Content flagged as objectionable

otalado
 

I apologize to reply to your message with an off topic question. Since English (American) is not my native language, I sometimes don't understand some references. I can relate to your mention of both one tube radios and 807 finals (I built both at age of 13), but I'd be glad if you explain what you mean by "MOPA design". I googled about that a little bit, but failed to find a meaningful explanation.

If I return to the topic, I absolutely agree with you that ham radio nowadays requires al least basic understanding of micro controllers and programming. Although C and C++ are not the only programming languages, they seem to be most used ones in micro controller area. Thus any kind of reference to Jack Purdum books covering C, C++ and ham radio are and should be most welcome in Bitx forums!


Re: Relay for antenna tuner output?

Clark Martin
 

Use the some model of relay as in the antenna tuner. If it isn’t adequate, the tuner is in trouble.



Clark Martin
KK6ISP

On Aug 22, 2020, at 9:06 PM, Rob French (KC4UPR) <kc4upr@arrl.net> wrote:

I use one of those N1DDC-style automatic antenna tuners from Russia (eBay) with my uBITX. I've been thinking about building a dummy load into the antenna tuner case (or even external for that matter, with a BNC), and making it so that:

(a) I can select between the dummy load or the antenna via a pushbutton, and

(b) Anytime the tuner is turned off, it will automatically switch to the dummy load, as a modest safety measure.

Does anyone have a recommendation as to the type of SPDT relay that I should use for this? What parameters do I need to consider? Obviously voltage level (accounting for both max power output, and high SWR conditions), but is there anything else? Anything for maintaining impedance? (I'm guessing not really, at HF. But I don't know.)


Relay for antenna tuner output?

Rob French (KC4UPR)
 

I use one of those N1DDC-style automatic antenna tuners from Russia (eBay) with my uBITX.  I've been thinking about building a dummy load into the antenna tuner case (or even external for that matter, with a BNC), and making it so that:

(a) I can select between the dummy load or the antenna via a pushbutton, and

(b) Anytime the tuner is turned off, it will automatically switch to the dummy load, as a modest safety measure.

Does anyone have a recommendation as to the type of SPDT relay that I should use for this?  What parameters do I need to consider? Obviously voltage level (accounting for both max power output, and high SWR conditions), but is there anything else?  Anything for maintaining impedance?  (I'm guessing not really, at HF.  But I don't know.)

Thanks!
-Rob KC4UPR


Re: kit-projects AGC with uBITX v5 - need help #v5

Rob French (KC4UPR)
 

One more solicitation for help, hoping someone has some thoughts.  Big picture, I don't *seem* to get any AGC response either due to the audio input to the AGC (which does register an S-meter reading, though not with DC voltage levels that I would expect), or even with +3V applied directly to the Common pad.  Doesn't seem to be any attenuation.  Again, for the first part (control voltage from the audio), I have a buffer and audio preamp that I use for line-out, and even when that thing is clipping the audio, it doesn't seem to have any effect on the AGC (and the control voltage doesn't seem to get above 0.5 VDC).

I did check the +12V input and the regulator +5V output on the AGC board, those are both fine. 

Thanks,
-Rob KC4UPR

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