Re: Mike element

iz oos

Thanks Jerry, I had always thought the opposite, the lower the more sensitive just like sensitivity in a receiver. So, I was wrong. What about sensitivity in headphones and speakers?

Il 17/lug/2018 04:29, "Gordon Gibby" <ggibby@...> ha scritto:
With that level of sensitivity, perhaps no preamp at all is needed with the bitx  series.

Available for three dollars at digikey.

Thanks for pointing it out and giving that educational lecture!

On Jul 16, 2018, at 21:51, Jerry Gaffke via Groups.Io <jgaffke@...> wrote:

Yes, you have it right.

For a given sound pressure into the mike,
the -24 dB mike creates a voltage that is 10 times bigger than the -44 dB mike.
A 10 times bigger voltage into a fixed resistance means 100 times more power,
since power in watts = volts * amps =   volts * volts/ohms.
With 100 times more power, that's 10 * log(100) = 20 dB more power.

If the mike were zero dB, we'd get 1 volt from the mike.
Since the voltages we are dealing with are less than one volt,
we get negative numbers when representing the values in dB.

Jerry, KE7ER

On Mon, Jul 16, 2018 at 04:58 PM, iz oos wrote:

So, would - 24db be 20db more sensitive than - 44db?

Il 16/lug/2018 22:26, "k1yw via Groups.Io" <k1yw=mail.ru@groups.io> ha scritto:
. . .

0 dB = 1 volt per Pascal
-24dB = .0.063 V/Pa
-44 db = 0.0063 V/Pa

Re: 3.2in Nextion display now looks great.

Malcolm

Thank you Allen, I was able to remove a number of switches from my original case after changing over to the Nextion screen. I also changed some colors using the Nextion editor, just for my preference! Apologies for the incorrect spelling of your surname in my original post. I have attached a picture of my original ubitx to show the improvement.

Re: Question about Nextion display and firmware

Mike Woods

Then it will definitely need some changes to the sketch!   The i2c pins are different for a start.  I'm not sure what else would need modifying.

Mike

On 17/07/18 4:58 AM, Bo Barry wrote:
Mike, I think he wanted a hex file compiled on a mega2560 not nano.
I was going to do that and give him the link to the uploader program. Bo W4GHV

--
Mike Woods
mhwoods@...

Re: Question about Nextion display and firmware

f1apy - Jacques

Hello Mike and Bo,

Thank’s for your responds, I agree with Mike, I need the sketch sources, for some modifications.

eg: pins assignations, specifics functions for myself and other choices.

I can redevelop a new firmware, but the CEC firmware is very pleasant and I appreciate this very well.

Jan have make a fantastic job and why to reinvent the wheel ?

73’s de Jacques – F1APY

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Mike Woods
Sent: Tuesday, July 17, 2018 10:05 AM
To: BITX20@groups.io
Subject: Re: [BITX20] Question about Nextion display and firmware

Then it will definitely need some changes to the sketch!   The i2c pins are different for a start.  I'm not sure what else would need modifying.

Mike

On 17/07/18 4:58 AM, Bo Barry wrote:

Mike, I think he wanted a hex file compiled on a mega2560 not nano.
I was going to do that and give him the link to the uploader program. Bo W4GHV

--
Mike Woods
mhwoods@...

Re: uBitx Version 3 and my homebrewed enclosure complete - Well Almost!!

Jose Silva

Hello all

Fine job Juddie, congratulations!

73
Saulo
PY7EG

2018-07-15 14:40 GMT-03:00 WD8WV :

Well, when I first posted about my uBitx being done, I made a mistake and in the title I typed QCX!  DUH!!!  Well, here I am again with my completed uBitx (not QCX).  I only have a few mods left to do, but right now I am having all kinds of issues trying to get the KD8CEC S-Meter modification done using the LM358 chip.  But I have that mod left to do, the TX/RX pop mod and the AGC mod by ND6T (I think that is right) to do.  I have already did the mod and added an RF gain control with a 1K potentiometer.  I created my own bezel for the front of my homebrewed enclosure. I also added a USB male to female adapter so I don't have to remove the cover to update the firmware.  Still need to get the SD card ribbon cable extender to plug into the Nextion display so I won't have to remove the display to update the tft files on the display.

73
Juddie WD8WV

Here are some pictures.
--
Judd, WD8WV

Razvan (M0HZH)

Theoretically the mixer (transformers, diodes) should be balanced and whether you ground pin 2 or pin 5 makes no difference, especially within the specified working range (0.5-500MHz). However, realistically you might get different LO leakage on the RF and IF ports, but that is over -50dBc on both ports at HF so not really something to worry about. Look at the Isolation L-R and Isolation L-I in the ADE1 datasheet, the values are slightly different:

Cheers,
Razvan.

pa0jen <pa0jen@...>

Hi Razvan,

The pins of interest are pin 2 and 5.
Since they belong to the other transformer, you might expect different LO leakage at higher frequencies.

Other than that, you will get a lot of bang for the buck.

73,
Han

 Virusvrij. www.avg.com

Re: Windows Serial Port Problem

Dennis Zabawa

Agreed - How can you "counterfeit" Open Source products??

Re: New file uploaded to BITX20@groups.io

Allen Merrell

Michel, thanks for sharing this.  I will check this out and make changes.
Have you seen any other problems that should be addressed.
Thanks again for sharing this issue.

kn4ud
--
Allen  Merrell

ubitx issue

Richard E Neese

I was using my ubitx v4 with a 12v 3a power brick all was going well. then it powered off and back on on its own and now when I transmit I get a high powe rcarrier and squeel but no audio .

Re: Nextion display cutout and mounting.

Stephanus K6NG

Awesome bezels from this site,
http://compfranon.uk/product/bezel-for-nextion-3-5-lcd-touch-display/

Very professional looking.
Stephanus

Re: Mike element

Jerry Gaffke

The receiver spec's how big of a signal goes in to give a desired result.
The microphone spec's how big of a signal goes out given a specific input sound level.
So the first gets a smaller number if more sensitive, the second increases if it's more sensitive.
Totally different industries, totally different notions of how to go about it.

A receiver's sensitivity figure in dBm tells us how much power must be coming in the antenna port
to achieve a specific result, in this case the "minimum discernible signal".
A power level zero dBm is arbitrarily defined as 1 milliwatt, and since typical signals at the receiver
are much lower in power, the receiver sensitivity is a fairly large negative number.

The microphone's sensitivity is defined as how big of a voltage signal we get coming out
when the microphone is presented with a sound pressure of one Pascal, and zero dBV is
arbitrarily defined as one Volt.

Most of the speakers I buy state something like: "Response from 20 Hz to 20 kHz".
Not very precise.
They don't actually say what the response is, could be argued that catching fire is a response of some sort.

Here's a webpage on speaker sensitivity:
http://www.psbspeakers.com/articles/Guide-to-Speaker-Specifications

"Sensitivity
Sensitivity is most easily defined as the speakers’ ability to effectively convert power into sound. The traditional way of measuring a speakers’ sensitivity is using the standard of 1 watt/1 meter. Meaning a microphone is placed 1 meter away from the speaker to measure the sound output (in decibels) with 1 watt of sound played through it. "

So like the microphone, they spec how big of a signal goes out (sound in dB) when given a specific input (1 watt of electrical power).
Makes sense, as would have been the same engineers working with microphones and speakers back when these things were defined.

Next question:
What is 0 dB of sound, and shouldn't that dB have a letter following it to tell us what the baseline is when finding that ratio?

Zero dB of sound is defined as the minimum discernible signal for the typical human ear.
No final letter because, well, it's a different group of engineers who defined it and they didn't care about the resulting confusion.

Jerry

On Mon, Jul 16, 2018 at 11:50 PM, iz oos wrote:

Thanks Jerry, I had always thought the opposite, the lower the more sensitive just like sensitivity in a receiver. So, I was wrong. What about sensitivity in headphones and speakers?

Re: Question about Nextion display and firmware

hirosmb <hirosmb@...>

Guys,

Sorry if I ask a silly question.

Do I have to switch Arduino nano to mega2560 if I use the Nextion display?

If it’s not the case, what is your incentive to switch them?, I’m just curious.

Thanx,

// hiro, JJ1FXF

2018/07/16 9:58、Bo Barry <wn4ghv@...>のメール:

Mike, I think he wanted a hex file compiled on a mega2560 not nano.
I was going to do that and give him the link to the uploader program. Bo W4GHV

Re: Ubitx version 4.3

p.gould1@sky.com <p.gould1@...>

Many thanks for that Jerry! Live and learn, yes solely cw, so filters will be the way to go. SSB for me would be a bonus that I probably wouldn't use ! The main source of irritation for me is the very low rx volume and of course keying. I wasn't aware that the firmware was available for the version 4 ubitx so will try and work out how to use that, very hard for an old dog to learn new tricks (hi) many thanks for the heads up, it's really appreciated. 73 to you.... Paul M6FEU

Re: Q70 replacement

Joshua Bagwell

Do you have a photo on it installed so I can get the orientation?

Thnx

Re: 3.2in Nextion display now looks great.

IZ4SJP Carlo

Great job Malcolm.
Where did you buy the tuning knob?
thanks
Carlo IZ4SJP

Re: Mike element

iz oos

Tnx Jerry for this valuable explanation in plain English. I learnt a lot from it. Hope this topic could become a question in the FCC exam if not included yet (I don't remember I have ever seen it).

Il 17/lug/2018 15:19, "Jerry Gaffke via Groups.Io" <jgaffke=yahoo.com@groups.io> ha scritto:
The receiver spec's how big of a signal goes in to give a desired result.
The microphone spec's how big of a signal goes out given a specific input sound level.
So the first gets a smaller number if more sensitive, the second increases if it's more sensitive.
Totally different industries, totally different notions of how to go about it.

A receiver's sensitivity figure in dBm tells us how much power must be coming in the antenna port
to achieve a specific result, in this case the "minimum discernible signal".
A power level zero dBm is arbitrarily defined as 1 milliwatt, and since typical signals at the receiver
are much lower in power, the receiver sensitivity is a fairly large negative number.

The microphone's sensitivity is defined as how big of a voltage signal we get coming out
when the microphone is presented with a sound pressure of one Pascal, and zero dBV is
arbitrarily defined as one Volt.

Most of the speakers I buy state something like: "Response from 20 Hz to 20 kHz".
Not very precise.
They don't actually say what the response is, could be argued that catching fire is a response of some sort.

Here's a webpage on speaker sensitivity:
http://www.psbspeakers.com/articles/Guide-to-Speaker-Specifications

"Sensitivity
Sensitivity is most easily defined as the speakers’ ability to effectively convert power into sound. The traditional way of measuring a speakers’ sensitivity is using the standard of 1 watt/1 meter. Meaning a microphone is placed 1 meter away from the speaker to measure the sound output (in decibels) with 1 watt of sound played through it. "

So like the microphone, they spec how big of a signal goes out (sound in dB) when given a specific input (1 watt of electrical power).
Makes sense, as would have been the same engineers working with microphones and speakers back when these things were defined.

Next question:
What is 0 dB of sound, and shouldn't that dB have a letter following it to tell us what the baseline is when finding that ratio?

Zero dB of sound is defined as the minimum discernible signal for the typical human ear.
No final letter because, well, it's a different group of engineers who defined it and they didn't care about the resulting confusion.

Jerry

On Mon, Jul 16, 2018 at 11:50 PM, iz oos wrote:

Thanks Jerry, I had always thought the opposite, the lower the more sensitive just like sensitivity in a receiver. So, I was wrong. What about sensitivity in headphones and speakers?

Re: Windows Serial Port Problem

Jim Lommel <wd8rwi@...>

I would guess that the install went badly.  I think that there is a program called Windows Update manager that you should look at and see ifit will allow you to uninstall the update.  I also think that there is a setting in th Update Manager that you can set to not automatically install updates.

73,

Jim
WD8RWI

On Sat, Jul 14, 2018 at 5:09 PM, Albert Woodhull <n1aw@...> wrote:
A few days ago my Windows 10 installation got updated, without asking me, of course.  I stepped away from the computer for a while and when
I came back updates were being installed.

I think my USB port drivers were changed.  When I try to run the KD8CEC Memory Manager or to upload a newly compiled  ubitx_20 version
I do not see the COM4 port any more. The Windows Device Manger shows an "Unusable Parallel Port (LPT3) where I previously saw a COM4
Serial Port.

Does anyone know what happened or how to undo it?

- Al N1AW

MVS Sarma

Thanks, I understand that the OP has a lot of  ADE-1-24.  Thus I decided to remove my earlier comment.
regards
sarma
vu3zmv

Re: 3.2in Nextion display now looks great.

Looks very nice Malcolm, I bought one of the 3.2E inch Nextion displays also, but I don't want to modify my already existing uBitx because it's all laid out for the 16X02 display and it looks good. I guess I'm going to have to buy another uBitx and another case. Oh well, I have to do what I have to do:-) Meanwhile this display is making me anxious to use it. I loaded the firmware into it and it works great.

Joel
N6ALT