Date   
Re: CEC 1.2 memory manager error Receive length 1/1027

Mike G4GOU
 

Got it working.

It did not like the USB cabel I was using, even though it worked to download the sketch it would not work with Memory Manager, most odd. I tried a different cable and all is now good.

CEC 1.2 memory manager error Receive length 1/1027

Mike G4GOU
 

Hi,

I have just loaded the KD8CEC 1.2 firmware and Nextion display into my uBitX v6.

The uBitX all appears to be working correctly. but when I try to run the Memory Manager it does not load the data and just displays 'Error Receive Length 1/1027' I have the port set to COM3 38400 None 8 One

I am using the same PC as when I loaded the sketch with X-Loader so the port appears to be working.

Has anyone any suggestions as to what I might be doing wrong?

Re: Made Mods to V3 uBitx - no longer transmitting #ubitx-help #v3

Steve - KE0VCD
 

Dave,

Thank you very much for your help.  You did an excellent job of documenting what was done.  I've learned a lot but clearly have far to go.  

Thanks again. 

Re: Lna #ubitx

Richard
 

Boy in this time of low signal problem, I would like to have to deal with the overload.

Re: Lna #ubitx

ajparent1/kb1gmx <kb1gmx@...>
 

For lower bands it would degrade the radio due to overload.

For higher bands 15/12/10M it can be of some value but requires a
bandpass filter to keep out broad cast signals that will degrade the receiver.
Even then you may need an attenuator for strong signals.

Allison
---------------------------------
No direct email, it goes to bit bucket due address harvesting in groups.IO

Re: RX sensitivity #v6

Joe Puma
 

Its always refreshing to see Allison popup out of the blue  =)

 

Hi Allison!

 

Joe

KD2NFC

 

Sent from Mail for Windows 10

 

From: ajparent1/kb1gmx
Sent: Wednesday, March 4, 2020 2:49 PM
To: BITX20@groups.io
Subject: Re: [BITX20] RX sensitivity #v6

 

On Sun, Mar 1, 2020 at 03:30 PM, Rick Tilton wrote:

He put it on his equipment to check SNR and it came out to 1 microvolt? 

Likely with a 10db S+N/Noise  and for HF 1uv is not that bad. 
That a signal and noise that is greater by 10DB than just the
noise output alone.   That means at about 10db less signal you
may still hear it (maybe weakly) which is still good.

FYI: a lot of well known radios .5uv for 10dbS+n/n is a very common
number.  Why not better?  At HF galactic and man made noise is 
sufficiently high enough that that will (very) easily be heard on a
receiver of that sensitivity.

The figure given in the published spec is really MDS of .2uV. as in
minimum discernible signal (enough to raise the average signal plus
noise level by 3DB).  That's actually pretty good.  For the test set
that may work out to a noticeably higher number (typically does).

>>> I did not get anywhere close to .01 microvolt?
RX sensitivity of .01uV, seriously?  getting .1 is very good,
but .01uV would be very hard to achieve.

Experience and reading specs for many radios would give
and idea of what normal and expected is.  Being inexperienced 
by your own words you do not have an idea of normal or expected.
Also measurements and measurement methods are well standardized
so those that understand them know what it means and how it was
arrived at.

 Allison
---------------------------------
No direct email, it goes to bit bucket due address harvesting in groups.IO

 

Re: RX sensitivity #v6

ajparent1/kb1gmx <kb1gmx@...>
 

For many years when young and limited test gear if a receiver
had greater noise on an antenna than a dummy resistor it was
deemed more than sensitive enough for HF use.

Many years later, with access to the needed gear,  measuring such
a receiver was very educational.  Often I'd had striven for sensitivity
that was far more than needed and one such radio easily hit better
than commercial numbers for sensitivity.   Which by the way is 
easier to achieve than selectivity and overload performance.

Allison
---------------------------------
No direct email, it goes to bit bucket due address harvesting in groups.IO

Re: RX sensitivity #v6

ajparent1/kb1gmx <kb1gmx@...>
 

On Sun, Mar 1, 2020 at 03:30 PM, Rick Tilton wrote:
He put it on his equipment to check SNR and it came out to 1 microvolt? 
Likely with a 10db S+N/Noise  and for HF 1uv is not that bad. 
That a signal and noise that is greater by 10DB than just the
noise output alone.   That means at about 10db less signal you
may still hear it (maybe weakly) which is still good.

FYI: a lot of well known radios .5uv for 10dbS+n/n is a very common
number.  Why not better?  At HF galactic and man made noise is 
sufficiently high enough that that will (very) easily be heard on a
receiver of that sensitivity.

The figure given in the published spec is really MDS of .2uV. as in
minimum discernible signal (enough to raise the average signal plus
noise level by 3DB).  That's actually pretty good.  For the test set
that may work out to a noticeably higher number (typically does).

>>> I did not get anywhere close to .01 microvolt?
RX sensitivity of .01uV, seriously?  getting .1 is very good,
but .01uV would be very hard to achieve.

Experience and reading specs for many radios would give
and idea of what normal and expected is.  Being inexperienced 
by your own words you do not have an idea of normal or expected.
Also measurements and measurement methods are well standardized
so those that understand them know what it means and how it was
arrived at.

 Allison
---------------------------------
No direct email, it goes to bit bucket due address harvesting in groups.IO

Re: RX sensitivity #v6

Bill Leaming
 

On 3/1/2020 1:26 PM, publique@... wrote:

Hello ! This is a very dummy question, but I can't really find the information... I would like to know what is the RX sensitivity of the ubitx ?
I had my uBITX on my service monitor yesterday and found clear signal all the way down to .1 uV...
As a comparison, my new Icom 7300's sensitivity for the same clarity of signal is .17 uV.

Re: uBitX v6 arrived today - information I found while waiting.

Joe Puma
 

When I was building my V3 I used uBitx.net a lot. The site really has all relevant info posted from this group and other sources. If you can’t find it there you don’t need to know about it lol. 

But seriously there is a tremendous amount of support channels for uBitx now. Even Facebook groups are thriving with builders and posters sharing their uBitx journeys. 

Spring is almost here for us northern continental folks, enjoy!

Joe
KD2NFC 



On Mar 4, 2020, at 12:58 PM, Curt via Groups.Io <wb8yyy@...> wrote:

Mike

i can't imagine you want us to expand your reading list, that's a lot to review and comprehend before assembly! 

Good news, much of that background info has been overcome in the updated design. 

Enjoy the experience for what it is - some assembly and thought required.  A bit different than powering up a rig shipped from one of those major brands - well except one must learn how to use thing.  Many folk harp on not being happy they can't use the rig without some instruction.  (actually I chose to find my path through the menus first ...)

enjoy the rig, and don't read all that stuff yet

Curt

Re: Made Mods to V3 uBitx - no longer transmitting #ubitx-help #v3

_Dave_ AD0B
 


--
73
This is a picture I took of the radio when I got it. I have put pointers at areas that were of concern On the left the color code of the connector was reversed. I  think the problem started with the previous owner installed a block with one wire into the tx power and another into the RX power i think that caused R87 and R88 to crack. If you look close you might see those components with hairline cracks in them I didn't notice until after I got out my oscope and wondered why that stage was not amplifying . Funny the associated transistors q911 and q912 didn't die.  I wish I had taken a better picture before I started.

Dave
AD0B
Raduino bracket and Ham_Made_Keys

Re: uBitX v6 arrived today - information I found while waiting.

Curt
 

Mike

i can't imagine you want us to expand your reading list, that's a lot to review and comprehend before assembly! 

Good news, much of that background info has been overcome in the updated design. 

Enjoy the experience for what it is - some assembly and thought required.  A bit different than powering up a rig shipped from one of those major brands - well except one must learn how to use thing.  Many folk harp on not being happy they can't use the rig without some instruction.  (actually I chose to find my path through the menus first ...)

enjoy the rig, and don't read all that stuff yet

Curt

automatic magnetic loop adjustment

Miguel Angelo Bartie
 

Hi guys !

The video is here :
https://www.youtube.com/watch?v=kZiuSQSslhg

Sketch / schematics :(portuguese)
https://www.qsl.net/py2ohh/loopauto/loopauto.html

73 from py2ohh miguel

Re: uBitX v6 arrived today - information I found while waiting.

Mick
 

Well done Mike, Nice “how to” page for future reference and to send to new users.
Thanks
73
Mick VA3EPM

uBitX v6 arrived today - information I found while waiting.

Mike G4GOU
 

Hi,

one of the members of my local radio club posted in our clubs chat group about the uBitX at the beginning of February this year and it grabbed my interest, I placed an order for the full kit on 14th February which was dispatched on the 21st, this morning (4th March) it arrived at my QTH in Spain.

Whilst waiting for it to arrive I scoured the internet looking for useful information and was surprised at how much there was to be found.

I have put together a list of links to the places where most of the stuff I needed was found as it could be of interest to anyone looking to purchase and build one.

General Info:

https://www.hfsignals.com/

http://ubitx.net/

http://www.hamskey.com/

https://bitxhacks.blogspot.com/

 

Delivery Tracking:

https://www.indiapost.gov.in/_layouts/15/dop.portal.tracking/trackconsignment.aspx

 

Forums:

https://groups.io/g/BITX20/topics

https://www.facebook.com/groups/1850616678547526/

 

Assembly:

https://www.hfsignals.com/index.php/ubitx-v6-assembling-the-full-kit/

 

Arduino Software:

https://www.arduino.cc/en/Main/Software

 

Nextion Display fitting:

http://ubitx.net/mod-add-colour-touch-screen/

https://antrak.org.tr/blog/projeler/nextion-display-mod-for-ubitx-v6/

 

Nextion Firmware:

http://www.hamskey.com/2019/04/release-cec-firmware-v1200-for-ubitx.html

Firmware update procedure:

http://www.hamskey.com/2018/01/how-to-upgrade-ubitx-firmware.html

 

Nextion Editor:

https://nextion.tech/nextion-editor/

 

160m LPF

https://shop.qrp-labs.com/LPF

  

QRP ATU:

https://m1kta-qrp.blogspot.com/2014/05/comments-on-chinese-atu.html
 

BFO Tuning aid:

https://www.hfsignals.com/index.php/bfo-tuning-aid/

  

AGC Board:

 

https://shop.kit-projects.com/index.php?route=product/product&product_id=101

Digi Interface:

 

https://radioarena.co.uk/universal-compact-data-mode-interface-version-3.html

S-Meter:

http://www.hamskey.com/2018/07/standalone-signal-analyzer-i2c-type_29.html#more

http://www.hamskey.com/2018/08/standalone-signal-analyzer-i2c-type.html#more

 

  

SWR/Power meter

http://www.hamskey.com/2019/04/installing-swr-and-rf-power-sensor-in.html#more

https://bitxhacks.blogspot.com/2017/03/nd6ts-forward-and-reverse-power-meter.html

https://kitsandparts.com/bridge1.4.php

Calibration: (Should be already calibrated on delivery)

https://www.youtube.com/watch?v=t6LGXhS4_O8&feature=youtu.be

1. Pick a station with known frequency which you can hear clearly. Like the WWV in the USA.

2. Dial the exact frequency on which it should be received. The actual signal will appear to be off the dialled frequency as the calibration is not proper.

3. Now hold down the tuning button until the setup menu pops up, choose calibration.

4. Using the tuning knob, tune up until the signal is zero-beat.

 

5. Click with the tuning knob again to save the setting. You are done.

I have ordered 2.8" Nextion display from Amazon and a pack of 3 Arduino Nano's so I will build the basic kit and assuming all looks to be working will upgrade it to the KD8CEC v1.2 software with the Nextion display and I2C meter.

I will also try controlling it from my Android tablet as it is supported by the Pocket RX/TX App which I already use with my Yaesu FT-950  and try it out with FT8.

I see a few reports of the included mic not being too good, so will hopefully put an old Icom SM-10 desk mic to good use.

I would be interested to hear if I have missed anything of importance before I get too far into the build and modifications.

73 Mike G4GOU/EA7KIP

Re: Lna #ubitx

iz oos
 

This is what I meant. A pre selector and a low noise very high IP such as the PG103+ by Mini Circuits makes absolutely sense. I think a MAV11, which is lower in gain although not as good as the PG103+ might be quite adequate. To mount these mmic one should have a proper board. As for the MAV11 I found it works fine (testing with Antuino) using Manhattan style using a copper board rising a bit the input and the output pins.


Il 04/mar/2020 14:01, "MadRadioModder" <madradiomodder@...> ha scritto:

I’ve used a 103+ MMIC preamp on all of my uBITx knock-offs with a digital attenuator and preselector.  Ultra-low noise and need on 10/12 meters for sure.

 

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Mick
Sent: Wednesday, March 4, 2020 6:10 AM
To: BITX20@groups.io
Subject: Re: [BITX20] Lna #ubitx

 

Mostly I was curious if it made any difference. In reality there are other upgrades I want to try first. AGC and S-meter for example.(specifically the kit-projects board). New speaker with audio amp is another.
all this to have more fun!
73
Mick VA3EPM


Virus-free. www.avg.com

--

…_. _._

Re: Lna #ubitx

MadRadioModder
 

I’ve used a 103+ MMIC preamp on all of my uBITx knock-offs with a digital attenuator and preselector.  Ultra-low noise and need on 10/12 meters for sure.

 

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Mick
Sent: Wednesday, March 4, 2020 6:10 AM
To: BITX20@groups.io
Subject: Re: [BITX20] Lna #ubitx

 

Mostly I was curious if it made any difference. In reality there are other upgrades I want to try first. AGC and S-meter for example.(specifically the kit-projects board). New speaker with audio amp is another.
all this to have more fun!
73
Mick VA3EPM


Virus-free. www.avg.com

--

…_. _._

Re: Lna #ubitx

Mick
 

Mostly I was curious if it made any difference. In reality there are other upgrades I want to try first. AGC and S-meter for example.(specifically the kit-projects board). New speaker with audio amp is another.
all this to have more fun!
73
Mick VA3EPM

Re: Lna #ubitx

iz oos
 

To me it sounds ridiculous to add a wideband rx amplifier to the Ubitx as it is already sensitive. Depending on conditions, you may obtain a better Signal to Noise ratio using a pre selector with a preamplifier. Mfj makes some that can be used in TX as well. Keep in mind that too much gain make the receiver less capable to listen weak signals when the font end becomes saturated and you jeopardise the dynamic range of the receiver.


Il 03/mar/2020 08:11, "MVS Sarma" <mvssarma@...> ha scritto:
LNA at front end with out having BPF  for band selection would be catastrophic. Power from radio broadcasts will overload such LNA and make mess.

Better to use multi-band 3 section filters and then use LNA with attenuator , if needed.  Farhan says  we dont need  band filters as ubitx uses dual conversion.


sarma  vu3zmv

On Tue, Mar 3, 2020 at 11:31 AM Evan Hand <elhandjr@...> wrote:
There have been multiple messages on this site covering the addition of an RF LNA to the input of the uBitx.  All conclude that it does not make a significant difference.  That is not the case with adding amplification in the audio sections,, with an add on audio power amp being the most common.

If you find that you do not have enough speaker volume, I would add the power amp, most common are based on the TDA2030.  Example :
https://groups.io/g/BITX20/message/76640

FWIW
73
Evan
AC9TU

Re: uBITX6 assembly instructions

Richard Spohn
 

Thank you, this is what I was looking for! - Rich WB2GXM

On 3/3/20, Evan Hand <elhandjr@...> wrote:
It's still there, just really hard to find:
https://www.hfsignals.com/index.php/ubitx-wire-up/

The site really needs a site map.
73
Evan
AC9TU