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Re: Quantum Indians

Simon Thompson
 

¿ªÔÆÌåÓý

When you come right down to it, radio is math and physics¡­and not much else.

On Oct 22, 2017, at 12:52 PM, Steve Black via Groups.Io <kb1chu@...> wrote:

Theres a couple guys over there who know a little bit about radio too (pun intended). Steve kb1chu
On 10/22/2017 03:41 PM, Simon Thompson wrote:
Thanks for sharing these anecdotes. There are many people in North America who do not know about the contribution of South Asian physicists and mathematicians to our understanding of the universe, and the Bitx group¡¯s sharing of these stories will help to spread awareness.
On Oct 22, 2017, at 4:24 AM, Raj vu2zap <rajendrakumargg@...> wrote:

Thanks for the Video Bill!

In '69 I met Sir Raman and along with Balu Balakrishnan attended many lectures on Radio Astronomy. Mrs. Raman was related
to Balu and she called us over when there was anything "radio" in lectures. We also were allowed to borrow tubes and parts
from their labs.. a great encouragement.

A year of so later he passed away. Sir Raman's son Dr. Radhakrishna became vu3fly and allowed our club to use their halls
etc for lectures and such.

Balu became vu2rvb, went to US did masters and was in National Semi.. got a lot of patents and started his own very
successful company Power Intergrations. They made chips for wall warts that went to sleep when you did not draw power.
Eventually he got the environmentalist of the year in 1999 as I remember. The US govt. I believe mandated all equipment
supplied to them should have this tech in it and the US saves a lot of power due to the chip.

Raj

At 22/10/2017, you wrote:
I met chandrashekhar once
? I had no idea who he was my elmer arun, VU2OZ introduced me to him as 'the astronomer guy'. He sat on the sofa drinking his south indian filter coffee from a steel tumbler, chattering away in tamil. What do i care? It was my time with the AR88 in his shack.
- f

On 21 Oct 2017 9:44 am, "Keith VE7GDH" <ve7gdh@...> wrote:
Bill N2CQR wrote...

> I thought you would all be interested in this
> beautiful video. The Quantum Indians



So, if half of the BITX40 is made of Bosons, does
it mean the other half is made of Fermions? It's
all over my head. I just turn it on and it works.
All the electrons know exactly how they are supposed
to jiggle and when.

Bose, Raman, Saha and their fellow scientists were
very smart cookies. We should probably include
Ramanujan in that group.

"The chief thing is to take some pleasure in your
work."

Ummm... was it Raman or Farhan that said that? hi!

--
73 Keith VE7GDH
st
Re: Quantum Indians

Steve Black
 

¿ªÔÆÌåÓý

Theres a couple guys over there who know a little bit about radio too (pun intended). Steve kb1chu
On 10/22/2017 03:41 PM, Simon Thompson wrote:

Thanks for sharing these anecdotes. There are many people in North America who do not know about the contribution of South Asian physicists and mathematicians to our understanding of the universe, and the Bitx group¡¯s sharing of these stories will help to spread awareness.
On Oct 22, 2017, at 4:24 AM, Raj vu2zap <rajendrakumargg@...> wrote:

Thanks for the Video Bill!

In '69 I met Sir Raman and along with Balu Balakrishnan attended many lectures on Radio Astronomy. Mrs. Raman was related
to Balu and she called us over when there was anything "radio" in lectures. We also were allowed to borrow tubes and parts
from their labs.. a great encouragement.

A year of so later he passed away. Sir Raman's son Dr. Radhakrishna became vu3fly and allowed our club to use their halls
etc for lectures and such.

Balu became vu2rvb, went to US did masters and was in National Semi.. got a lot of patents and started his own very
successful company Power Intergrations. They made chips for wall warts that went to sleep when you did not draw power.
Eventually he got the environmentalist of the year in 1999 as I remember. The US govt. I believe mandated all equipment
supplied to them should have this tech in it and the US saves a lot of power due to the chip.

Raj

At 22/10/2017, you wrote:
I met chandrashekhar once
? I had no idea who he was my elmer arun, VU2OZ introduced me to him as 'the astronomer guy'. He sat on the sofa drinking his south indian filter coffee from a steel tumbler, chattering away in tamil. What do i care? It was my time with the AR88 in his shack.
- f

On 21 Oct 2017 9:44 am, "Keith VE7GDH" <ve7gdh@...> wrote:
Bill N2CQR wrote...

> I thought you would all be interested in this
> beautiful video. The Quantum Indians



So, if half of the BITX40 is made of Bosons, does
it mean the other half is made of Fermions? It's
all over my head. I just turn it on and it works.
All the electrons know exactly how they are supposed
to jiggle and when.

Bose, Raman, Saha and their fellow scientists were
very smart cookies. We should probably include
Ramanujan in that group.

"The chief thing is to take some pleasure in your
work."

Ummm... was it Raman or Farhan that said that? hi!

--
73 Keith VE7GDH
st
Re: Bandpass filter

 

Hi Farhan,

Forgive me if I do not understand- you're speaking just about bandpass filters, correct? Or are you suggesting doing this for both the band pass and the low pass filters??
--
Ryan Flowers W7RLF

?

?<-- Learn how to go digital on the BITX40
Re: Quantum Indians

Simon Thompson
 

¿ªÔÆÌåÓý

Thanks for sharing these anecdotes. There are many people in North America who do not know about the contribution of South Asian physicists and mathematicians to our understanding of the universe, and the Bitx group¡¯s sharing of these stories will help to spread awareness.

On Oct 22, 2017, at 4:24 AM, Raj vu2zap <rajendrakumargg@...> wrote:

Thanks for the Video Bill!

In '69 I met Sir Raman and along with Balu Balakrishnan attended many lectures on Radio Astronomy. Mrs. Raman was related
to Balu and she called us over when there was anything "radio" in lectures. We also were allowed to borrow tubes and parts
from their labs.. a great encouragement.

A year of so later he passed away. Sir Raman's son Dr. Radhakrishna became vu3fly and allowed our club to use their halls
etc for lectures and such.

Balu became vu2rvb, went to US did masters and was in National Semi.. got a lot of patents and started his own very
successful company Power Intergrations. They made chips for wall warts that went to sleep when you did not draw power.
Eventually he got the environmentalist of the year in 1999 as I remember. The US govt. I believe mandated all equipment
supplied to them should have this tech in it and the US saves a lot of power due to the chip.

Raj

At 22/10/2017, you wrote:
I met chandrashekhar once
? I had no idea who he was my elmer arun, VU2OZ introduced me to him as 'the astronomer guy'. He sat on the sofa drinking his south indian filter coffee from a steel tumbler, chattering away in tamil. What do i care? It was my time with the AR88 in his shack.
- f

On 21 Oct 2017 9:44 am, "Keith VE7GDH" <ve7gdh@...> wrote:
Bill N2CQR wrote...

> I thought you would all be interested in this
> beautiful video. The Quantum Indians



So, if half of the BITX40 is made of Bosons, does
it mean the other half is made of Fermions? It's
all over my head. I just turn it on and it works.
All the electrons know exactly how they are supposed
to jiggle and when.

Bose, Raman, Saha and their fellow scientists were
very smart cookies. We should probably include
Ramanujan in that group.

"The chief thing is to take some pleasure in your
work."

Ummm... was it Raman or Farhan that said that? hi!

--
73 Keith VE7GDH
st
Re: Quantum Indians

 

We all stand on the shoulders of giants. So many of our greatest scientists and artists are obscure until after their passing.

A friend, Bill W6FA was a prof @ CalTech when Nobel winner Richard Feynman was hired to lecture at lunchtime on any topic he wished.? What amazing good fortune!

Thanks for sharing that link. I've passed it to others who share my fascination with India - esp Indian food<grin>.? So glad I now know whom to blame for Bosons.

Thanks for all you do for us!
Re: BITX40 PTT Noise

Robert Ogburn
 

?Has anyone tried changing C115 and C122 from 1uF to 100nF??? (C115 for receive pop, C122 for carrier issue?)
Re: I made a mistake

Master Ice
 

?
Certainly forget the Chinese Nano clones working much above 9V despite many sellers saying they're good for 12V and even 15V.
I had several release the magic smoke when running them on 12V as the regulators simply popped their tops before I realised the problem was they all had rubbish regulators.
Either run with 9V maximum or preferably go in with a good known 5V supply into the 5V in connection.
?
Dale G4IPZ
?
----- Original Message -----
Sent: Sunday, October 22, 2017 6:36 PM
Subject: Re: [BITX20] I made a mistake

You're probably right.?

But I would not count on a $2 Nano clone dealing with 12v at vin.
Depends on what regulator these clones have.
Some cheaper regulators may not be good beyond 5v.
And at 12v it will be dissipating a bunch of power,
if the regulator does not incorporate a thermal shutdown mode it will be toast.


On Sat, Oct 21, 2017 at 07:42 pm, K5ESS wrote:

Well that¡¯s not strictly correct.? There is one exception.? Although it¡¯s apparently not connected in the Raduino configuration the Vin pin on the Nano goes to a voltage regulator that can take an input of up to a typical value of 15 v.?

?


Virus-free.

W8TEE B40 real time clock connections #w8tee

 

Jack,
I have the 1.08 version of your code and everything is working great, except the connections for the real time clock module have me stumped. I see the reference to pin 53 in the code, but it seems like the RTC module requires 3 pin connections in addition to Vcc and Gnd. I have the same Keyestudio DS3234 module you have pictured in v.04 of the manual. Am I missing something simple?

73 Loren KA5U
Re: ?Raduino v1.26 (eliminate carrier burst, improved calibration method) released

 

Very cool, Allard!
We all much appreciate the time you are putting into this.
I hope some are contributing a few bucks to the charity you show on your github page.

I'm not convinced that just multiplicative correction will be a win when using v1 firmware,
it all depends on whether it is errors in the bfo crystal or errors in the 25mhz si5351 reference
that predominate. ?Will be interesting to see reports in this forum about how v1.26
has affected calibration accuracy for most users.

However, multiplicative correction will definitely be a big win when we go to Allard's v2 firmware,
which will also drive the bfo from the si5351.
Though there may be issues with crosstalk, as Jean Matthieu points out:
? ??/g/BITX20/message/33741
Using only CLK0 and CLK2, holding CLK1 at ground, should somewhat alleviate the crosstalk.
If some users feel that still isn't good enough, perhaps we could cook up a Raduino with two Si5351 chips,
preferably using the same 25mhz reference to simplify these calibration issues..

Jerry, KE7ER


On Sat, Oct 21, 2017 at 04:09 pm, Allard PE1NWL wrote:
  • For VFO calibration, use multiplicative correction (ppm) for better accuracy over a wide frequency range (tks Jerry KE7ER)
Re: I made a mistake

 

You're probably right.?

But I would not count on a $2 Nano clone dealing with 12v at vin.
Depends on what regulator these clones have.
Some cheaper regulators may not be good beyond 5v.
And at 12v it will be dissipating a bunch of power,
if the regulator does not incorporate a thermal shutdown mode it will be toast.


On Sat, Oct 21, 2017 at 07:42 pm, K5ESS wrote:

Well that¡¯s not strictly correct.? There is one exception.? Although it¡¯s apparently not connected in the Raduino configuration the Vin pin on the Nano goes to a voltage regulator that can take an input of up to a typical value of 15 v.?

?
Re: More questions

 

Allard,

The issue is not with your software. I am using a stripped down version of code that I don't think was even for the Raduino (originally from Ron PA3FAT) that uses a rotary encoder and I borrowed the ideas from your CheckTX routine.? What I discovered was that I was using an old version of NT7S's library that was not recognising the command to turn the clock off. I updated the library and it worked fine for the PTT ON cycle but not for the PTT OFF cycle, where I am still getting a burst.

I duplicated the IF routine in checkTX used for the on cycle for use in the off cycle but that did not work.? I was wondering if the PTT_SENSE voltage was dropping too slowly to get back to a false state before the burst came through so rather than using a Boolean function for PTT_SENSE I changed it to an analogread function and set the thresholds at various levels to experiment, hoping to recognise the RX state sooner. The on cycle worked with the analog version of PTT_SENSE (ie no carrier burst) but the off cycle did not. There is still a burst during the off cycle of the PTT switch.? It's late here and I will have to take this up tomorrow. I am a hack when it comes to coding, its pretty much trial by error so there could be something in my code that is making it too slow.

Thanks to Dave, and you for code only version for getting me this far. The carrier burst (and the speaker pop - solved separately) have bothered me since day one and this is the first thing that has worked.

73

Simon VK3ELH
Re: Quantum Indians

 

Thanks for the Video Bill!

In '69 I met Sir Raman and along with Balu Balakrishnan attended many lectures on Radio Astronomy. Mrs. Raman was related
to Balu and she called us over when there was anything "radio" in lectures. We also were allowed to borrow tubes and parts
from their labs.. a great encouragement.

A year of so later he passed away. Sir Raman's son Dr. Radhakrishna became vu3fly and allowed our club to use their halls
etc for lectures and such.

Balu became vu2rvb, went to US did masters and was in National Semi.. got a lot of patents and started his own very
successful company Power Intergrations. They made chips for wall warts that went to sleep when you did not draw power.
Eventually he got the environmentalist of the year in 1999 as I remember. The US govt. I believe mandated all equipment
supplied to them should have this tech in it and the US saves a lot of power due to the chip.

Raj

At 22/10/2017, you wrote:

I met chandrashekhar once
? I had no idea who he was my elmer arun, VU2OZ introduced me to him as 'the astronomer guy'. He sat on the sofa drinking his south indian filter coffee from a steel tumbler, chattering away in tamil. What do i care? It was my time with the AR88 in his shack.
- f

On 21 Oct 2017 9:44 am, "Keith VE7GDH" <ve7gdh@...> wrote:
Bill N2CQR wrote...

> I thought you would all be interested in this
> beautiful video. The Quantum Indians



So, if half of the BITX40 is made of Bosons, does
it mean the other half is made of Fermions? It's
all over my head. I just turn it on and it works.
All the electrons know exactly how they are supposed
to jiggle and when.

Bose, Raman, Saha and their fellow scientists were
very smart cookies. We should probably include
Ramanujan in that group.

"The chief thing is to take some pleasure in your
work."

Ummm... was it Raman or Farhan that said that? hi!

--
73 Keith VE7GDH
Re: More questions

 

On Sun, Oct 22, 2017 at 03:54 am, Kelly Jack wrote:
I tried the software with PTTsense to A0 with the normal PTT circuit
Simon, which software? The v1.26 released last night?
73 Allard PE1NWL
Re: More questions

 

Hi all,

I tried the software with PTTsense to A0 with the normal PTT circuit and could still see a carrier burst on both push and release of PTT on a scope. Think I will have to run it through the raduino per Dave's version.

Dave when you say :? "output the PTT to the relays" what do you mean by this??

73

Simon VK3ELH
Re: Quantum Indians

 

I met chandrashekhar once
?I had no idea who he was my elmer arun, VU2OZ introduced me to him as 'the astronomer guy'. He sat on the sofa drinking his south indian filter coffee from a steel tumbler, chattering away in tamil. What do i care? It was my time with the AR88 in his shack.
- f

On 21 Oct 2017 9:44 am, "Keith VE7GDH" <ve7gdh@...> wrote:
Bill N2CQR wrote...

> I thought you would all be interested in this
> beautiful video. The Quantum Indians



So, if half of the BITX40 is made of Bosons, does
it mean the other half is made of Fermions? It's
all over my head. I just turn it on and it works.
All the electrons know exactly how they are supposed
to jiggle and when.

Bose, Raman, Saha and their fellow scientists were
very smart cookies. We should probably include
Ramanujan in that group.

"The chief thing is to take some pleasure in your
work."

Ummm... was it Raman or Farhan that said that? hi!

--
73 Keith VE7GDH
Re: I made a mistake

 

Thanks Mike.

... *anywhere* but the power pins: VIN, 5V, GND, (REF, 3V3?) ...

Not sure of those last 2, they may be intrinsically protected/immune. :)

For my part, I'm wary of ESD anywhere near stray wiring, dangling bits ... that's what tripped me up - a brain-fade that led to a banjaxed Raduino.

73 ...
Re: ?Raduino v1.26 (eliminate carrier burst, improved calibration method) released

Gordon Gibby
 

¿ªÔÆÌåÓý

?I sure do appreciate all the efforts you/others have made.? ?I downloaded 1.24 a while back and it made night and day difference in my bitx40!!!? ?(versus original stock software).


gordon gibby kx4z

From: [email protected] <[email protected]> on behalf of Allard PE1NWL <pe1nwl@...>
Sent: Saturday, October 21, 2017 7:09 PM
To: [email protected]
Subject: [BITX20] ?Raduino v1.26 (eliminate carrier burst, improved calibration method) released
?
Hi, I've just released raduino v1.26, download it from
New in this release:

  • Rearranged the menu structure, skip menu items that aren't available when related mods are not installed
  • Suppress the spurious carrier burst when the radio swithes to TX (tks Dave M0WID)
  • For VFO calibration, use multiplicative correction (ppm) for better accuracy over a wide frequency range (tks Jerry KE7ER)
  • Improved method for saving/restoring user settings to EEPROM (tks Pavel CO7WT)
Be sure to read the updated instructions at?
Happy BitX-ing!

73 Allard PE1NWL
Re: I made a mistake

 

¿ªÔÆÌåÓý

12V *anywhere* on the Nano will destroy it!

?

Well that¡¯s not strictly correct.? There is one exception.? Although it¡¯s apparently not connected in the Raduino configuration the Vin pin on the Nano goes to a voltage regulator that can take an input of up to a typical value of 15 v.?

Mike

K5ESS

?

From: [email protected] [mailto:[email protected]] On Behalf Of Dexter N Muir
Sent: Saturday, October 21, 2017 13:54
To: [email protected]
Subject: Re: [BITX20] I made a mistake

?

12V *anywhere* on the Nano will destroy it! though the A... and D... leads are the most susceptible.

D7, with C130, is *supposed* to be a snubber for K1's back-emf on release of PTT, but is only that accidentally. Its top-layer track from the Anode goes to a 'via' down to the bottom-layer ground-plane, making it mainly a polarity-protector if you fit a fuse. I've excised the plane around the via, cleaning that off to create a pad which then takes a short jumper to K1.9. That gives it its intended purpose. On the diagram, delete the ground and place it below C130A (where is that on the board? is it really there?), disconnect the line to C130 and connect that to the *other* side of C130A (= K1.9).
Re: Raduino question.

 

The Raduino uses the si5351 clock generator, outputs from si5351 have just a series cap where they leave the raduino.
Datasheet here: ?
says outputs are 3.3v CMOS with a 50 ohm output impedance.
You can adjust the output drive level through i2c registers.

Farhan is successfully driving schottky diode ring mixers on the ubitx: ?
He shows both the ubitx and raduino schematics at the bottom of that webpage.
So raduino should be fine with any of the level 3 diode ring mixers.
An update on the ubitx is in this thread: ?/g/BITX20/message/33255


On Sat, Oct 21, 2017 at 01:53 pm, Ian Gerard wrote:
I was wondering what the output of the Raduino is?? In particular is the output enough to drive an SBL-1 or an ADE-1 between 7 and 28Mhz?
Bandpass filter

 

There is a also design of BPF with lower losses. Have a look at


Happy bitxing

Bhatnagar
VU2SPF
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