Date   
Spurious Emission Measurement on stock uBitX

JJ1FXF
 

Hi, all.

Attached is a PDF file which shows the results of measuing spurious emission on my uBitX which I haven't modified its hardware/software at all.

Here, in Japan, the spurious emission should be less than -50dBc and so the list indicates I can use my uBitX with a Pi-C antenna tuner, but not on 15m unfortunately.

This time, I checked only the CW transmission beccause I had a problem to measure SSB case. It would be very much appreciated if someone could advise to me.

To measure the spurious emission on SSB, at first I need to saturate the PA output by the mic input of so called "pseudo voice" that is 1.5kHz sine wave, and when the output is saturated by increasing the input leve, then 80% of the input level will be used to measuer spurious emission, the Lab guy explained to me.

However, uBitX output won't be saturated which means I couldn't observe the flat level of PA output as increasing the input (pseudo voice) level, but suddenly the output level falls down to a few mW.

The Lab guy said it would be because uBitX didn't have an ALC - Auto Level Controller of the mic input.

So please advise to me how I can saturate the output (PA) level with such a "pseudo voice" input? Maybe bring an external mic compressor? However, how can I observe the flat level of PA output?

Thank you for reading my long email. Hope someone can help me. If you are interested in screen shots of the spurious analyzer, feel free to email me.

BR,

// hiro, JJ1FXF

Re: Raduino Clone kit from W0EB-N5IB #ubitx

Jim Sheldon
 

I can't truthfully answer that.  It was designed after the uBITX Raduino and plugs into the 16 pin Raduino socket on the uBITX just like the factory's Raduino for the uBITX. You'd be on your own trying to adapt it for the BITX40.  Not sure if the BITX40 software would work on it either.

Jim

On Aug 17, 2018, at 8:55 AM, V Zecchinelli <n1vin@...> wrote:

Hey Jim,

Will this PCB also work with BitX40?

Thanks,

Vince, N1VIN



On 8/17/2018 9:50 AM, Jim Sheldon wrote:
The new Raduino Clone boards arrived Wednesday.  Kits are back in stock and available for order

$6 post paid in the US for the bare board, $8 (USD) postpaid for international orders.
$25 postpaid for a complete kit including a pre programmed Arduino NANO loaded with the factory version 4.3 code from Github.  International orders $40 (USD) shipped as international postage is $14.50 for the kit.
$35 postpaid in the US for the complete kit as above but with the Si5351 Clock Chip already soldered in place and continuity checked for good connections and no shorts between pins. $50 (USD) shipped internationally


Further details and contact/ordering information can be found on www.w0eb.com

Jim, W0EB

Re: Spurious Emission Measurement on stock uBitX

iz oos
 

Hi Hiro, nice analysis, if I understand right if you add also any 30mhz (also like CB) lowpass filter you may transmit on 15m band. Isn't? Is the Trio tuner a simple pi-tuner? I have just done a variable low pass filter with a double 450pf air variable capacitor a six position switch and a 130-7 toroid and looking at PC the results from my antenna analyzer it seems better than expected.


Il 17/ago/2018 16:39, "JJ1FXF" <jj1fxf@...> ha scritto:
Hi, all.

Attached is a PDF file which shows the results of measuing spurious emission on my uBitX which I haven't modified its hardware/software at all.

Here, in Japan, the spurious emission should be less than -50dBc and so the list indicates I can use my uBitX with a Pi-C antenna tuner, but not on 15m unfortunately.

This time, I checked only the CW transmission beccause I had a problem to measure SSB case. It would be very much appreciated if someone could advise to me.

To measure the spurious emission on SSB, at first I need to saturate the PA output by the mic input of so called "pseudo voice" that is 1.5kHz sine wave, and when the output is saturated by increasing the input leve, then 80% of the input level will be used to measuer spurious emission, the Lab guy explained to me.

However, uBitX output won't be saturated which means I couldn't observe the flat level of PA output as increasing the input (pseudo voice) level, but suddenly the output level falls down to a few mW.

The Lab guy said it would be because uBitX didn't have an ALC - Auto Level Controller of the mic input.

So please advise to me how I can saturate the output (PA) level with such a "pseudo voice" input? Maybe bring an external mic compressor? However, how can I observe the flat level of PA output?

Thank you for reading my long email. Hope someone can help me. If you are interested in screen shots of the spurious analyzer, feel free to email me.

BR,

// hiro, JJ1FXF




Re: Spurious Emission Measurement on stock uBitX

JJ1FXF
 

Iz,

Thanks for reading.

No, I didn’t insert any LPF but only the simple pi-tuner was there btw uBitX and analyzer, because I thought pi-tuner might work as a kind of BPF.

There will be a possibility to suppress the spur emission if I add a LFP but what I observed was the spur of 28MHz with AT was OK but 21 MHz was not. So maybe I need some drastic solution, I suppose.

Here is a manual of TRIO AT-200 antenna tuner, if you are interested in it.


Yes, I’m planning to do like what you did. So I already got AA-30.ZERO antenna analyzer.

Thanks for your comments.

// hiro, JJ1FXF



2018年8月18日(土) 0:30 iz oos <and2oosiz2@...>:

Hi Hiro, nice analysis, if I understand right if you add also any 30mhz (also like CB) lowpass filter you may transmit on 15m band. Isn't? Is the Trio tuner a simple pi-tuner? I have just done a variable low pass filter with a double 450pf air variable capacitor a six position switch and a 130-7 toroid and looking at PC the results from my antenna analyzer it seems better than expected.


Il 17/ago/2018 16:39, "JJ1FXF" <jj1fxf@...> ha scritto:
Hi, all.

Attached is a PDF file which shows the results of measuing spurious emission on my uBitX which I haven't modified its hardware/software at all.

Here, in Japan, the spurious emission should be less than -50dBc and so the list indicates I can use my uBitX with a Pi-C antenna tuner, but not on 15m unfortunately.

This time, I checked only the CW transmission beccause I had a problem to measure SSB case. It would be very much appreciated if someone could advise to me.

To measure the spurious emission on SSB, at first I need to saturate the PA output by the mic input of so called "pseudo voice" that is 1.5kHz sine wave, and when the output is saturated by increasing the input leve, then 80% of the input level will be used to measuer spurious emission, the Lab guy explained to me.

However, uBitX output won't be saturated which means I couldn't observe the flat level of PA output as increasing the input (pseudo voice) level, but suddenly the output level falls down to a few mW.

The Lab guy said it would be because uBitX didn't have an ALC - Auto Level Controller of the mic input.

So please advise to me how I can saturate the output (PA) level with such a "pseudo voice" input? Maybe bring an external mic compressor? However, how can I observe the flat level of PA output?

Thank you for reading my long email. Hope someone can help me. If you are interested in screen shots of the spurious analyzer, feel free to email me.

BR,

// hiro, JJ1FXF




#ubitx. Increasing power output

Bo Barry <bobarr@...>
 

 I know this is an old topic, but I want to do some SIMPLE tinkering & learning.
I put 'socket pins' in for the 6 3904s thinking I could simply find some 'hotter' replacements. 🤔

Well I tried some 5109 and 2369s found on eBay. No noticeable improvements noted.

Then I tried my hand with LTSPICE, having used in since the 60's and taught it until '06.  One of the transistors was in their library and I think I added the model for the 5109 correctly.
Not sure my setup is 100%, but I did get similar dismal results.
Anyone have some transistor types that may work. 
Not interested in other mods YET. 
I used to be addicted (and very skilled) in several versions if SPICE. Still have the MicroSim version somewhere.
Bo W4GHV 
  

#ubitx. Strange RFI problem

Bo Barry <bobarr@...>
 

I updated to 1.97 and developed two problems.
1. On 40 meters, when FT8 or WSPR finishes a cycle, the transmitter switches to LSB and stays keyed. Power off on the Randuino required.

2. My iambic paddle sends a dash initially on the dits.
I fixed it earlier with the previous firmware /manager program. The new manager has two places for the ditch and dash A/D values. I got the measured values (nice feature) but don't know what numbers to use.

I'll probably find the obvious solutions later, but ideas appreciated in the meantime.
The little ubitx covers the country on WSPR with its 10 watts on 20 at night when the band is dead!
Bo W4GHV 

Re: Please advise

Michael Mitchell
 

Thanks. Its been years since I have had to think about electronics. Sometimes its as if I never taught it.
The reason for this project is I was getting bored with 100 watts and at the same time had problems with my 100 W radio which I can't
ever afford to replace.

Thanks again
mike
WM4MM
 

Re: Spurious Emission Measurement on stock uBitX

Kees T
 

Hiro,

Very nice summary chart showing the effect of adding an external Pi tuner. 

73 Kees K5BCQ

Re: Audio feedback during transmit? #ubitx

Thomas Clark
 

On Mon, Jun 18, 2018 at 06:00 PM, Jim Reagan wrote:
I'm having audio feedback during transmit through my external speaker.!  I have the issue even with a dummy load.  I hear my voice (distorted) on the receive side when transmitting on any band. Anyone else have this issue?
Thanks,,
I have the same problem. It started after I added an Adafruit 2.5W audio amp in the speaker line. The audio volume is great now but the microphone. Would shielding on the audio lines help?

N6ALT: Nextion 3.2 inch Enhanced display not displaying right

 

Hi all,

I have updated the uBitx to KD8CDC's 1.097 firmware and the the latest Nextion 3.2 E tft file to the 3.2 inch display. The display updates and shows up okay except it doesn't fill the right hand side of the display. It's about 3/4 of inch in on that side. The top and bottom fit okay just not the right side. I have tried other size files and they wont load because a get a wrong file error. Anybody else notice this? It almost has to be the file as there is nothing more I can do. Tried other SD cards with same problem.

Joel
N6ALT

Re: N6ALT: Nextion 3.2 inch Enhanced display not displaying right

 

I forgot, the Nextion file is V3.0.

Joel
N6ALT

Re: Spurious Emission Measurement on stock uBitX

ajparent1/KB1GMX
 

Hiro san,

To do testing on SSB a audio tone signal source is needed. There are aps for android
and Iphone that do this.  The procedure is generate the 1.5khz tone and inject it into
the microphone input.  Turn audio source volume up until power does not increase
then reduce to the specified 80% of max power for each band.  Repeat this on a
per band basis for best results.  Note power out used for that band.


Allison

Re: Spurious Emission Measurement on stock uBitX

Arv Evans
 

Iz Oos

Might not want to encourage uBITX users to expect that a CB filter will make it legal
on 15 meters.  The 15M spur is in the 23 MHz range so would not be attenuated by
a 30 MHz LPF.

Arv K7HKL
_._


On Fri, Aug 17, 2018 at 9:31 AM iz oos <and2oosiz2@...> wrote:

Hi Hiro, nice analysis, if I understand right if you add also any 30mhz (also like CB) lowpass filter you may transmit on 15m band. Isn't? Is the Trio tuner a simple pi-tuner? I have just done a variable low pass filter with a double 450pf air variable capacitor a six position switch and a 130-7 toroid and looking at PC the results from my antenna analyzer it seems better than expected.


Il 17/ago/2018 16:39, "JJ1FXF" <jj1fxf@...> ha scritto:
Hi, all.

Attached is a PDF file which shows the results of measuing spurious emission on my uBitX which I haven't modified its hardware/software at all.

Here, in Japan, the spurious emission should be less than -50dBc and so the list indicates I can use my uBitX with a Pi-C antenna tuner, but not on 15m unfortunately.

This time, I checked only the CW transmission beccause I had a problem to measure SSB case. It would be very much appreciated if someone could advise to me.

To measure the spurious emission on SSB, at first I need to saturate the PA output by the mic input of so called "pseudo voice" that is 1.5kHz sine wave, and when the output is saturated by increasing the input leve, then 80% of the input level will be used to measuer spurious emission, the Lab guy explained to me.

However, uBitX output won't be saturated which means I couldn't observe the flat level of PA output as increasing the input (pseudo voice) level, but suddenly the output level falls down to a few mW.

The Lab guy said it would be because uBitX didn't have an ALC - Auto Level Controller of the mic input.

So please advise to me how I can saturate the output (PA) level with such a "pseudo voice" input? Maybe bring an external mic compressor? However, how can I observe the flat level of PA output?

Thank you for reading my long email. Hope someone can help me. If you are interested in screen shots of the spurious analyzer, feel free to email me.

BR,

// hiro, JJ1FXF




Re: #ubitx. Increasing power output

Skip Davis
 

Bo have you tried the 2N2222A or 2N2219’s yet? Although I haven’t added sockets I did replace all 2N3904s with 2N2222A starting with Q90. My output has increased on the upper bands. 

Skip Davis, NC9O

On Aug 17, 2018, at 11:59, Bo Barry <bobarr@...> wrote:

 I know this is an old topic, but I want to do some SIMPLE tinkering & learning.
I put 'socket pins' in for the 6 3904s thinking I could simply find some 'hotter' replacements. 🤔

Well I tried some 5109 and 2369s found on eBay. No noticeable improvements noted.

Then I tried my hand with LTSPICE, having used in since the 60's and taught it until '06.  One of the transistors was in their library and I think I added the model for the 5109 correctly.
Not sure my setup is 100%, but I did get similar dismal results.
Anyone have some transistor types that may work. 
Not interested in other mods YET. 
I used to be addicted (and very skilled) in several versions if SPICE. Still have the MicroSim version somewhere.
Bo W4GHV 
  

Re: N6ALT: Nextion 3.2 inch Enhanced display not displaying right

SV9CVJ Nikos
 

Official Support GUI is for  2.4", 2.8" LCD, but include 3.2, 3.5 for test (just converted from 2.8")                                                                                                                                                                                                                                                                                                   

uBITx intermittent cw transmit

Joe Milosch <zzmiloschxx@...>
 

Hi,
I recently built my ubitx, and after assembling
it received perfectly. I just got my HAM license,
so I decided to see how the cw key function worked.
There seems to be a problem.

I am using the stock software which came with my
July 2018 delivered ubitx.

The PTT function works perfectly, just the slightest ground
puts the ubitx into Tx voice mode.

With CW, the story is different.
First, the instructions are pretty shoddy, and only because
I could trace the wires from pictures in some setup instructions
was I able to figure out the wiring to the various 1/8'' female
connector sockets.

I found there was no mention of the keyer socket PIN 3 connection
to the yellow ground wire of the Arduino, and it seems that
I needed to make a wire jumper to connect the keyer socket ground
to the Arduino yellow wire at PIN 4, the Arduino ground.
I guess they assumed a metal chassis would make the connection?
I have a plastic chassis.

So OK, got that glitched fixed and I fully expected it to work.
I had 5 volts connected to the 4.7k resistor, and the blue and green
wire connections were correct.

When I tried to key, nothing happened. I thought it might be a dirty
straight key, so I tried monmentarily jumpering the blue wire to
ground. It correctly went from 5v to 0v on each contact.

Now this is the weird part. If I repeatedly touched the blue wire
to Arduino ground ( yellow wire ), the cw tx mode would suddenly
start, with TX power and proper sidetone, then suddenly stop.

There is no pattern to trigger it. If I repeatedly touched and
shorted the blue to yellow ground, I would randomly get
a burst of dits and dahs, then it would stop. I could repeat this
over and over, but without finding a definite pattern.

I thought maybe the Arduino board had a bad solder joint,
or some other intermittent problem, but I'm also wondering
if the stock software is flawed in the cw portion, and the Arduino
is having a hard time detecting the voltage drop of the key.

Before I go any further in ripping this thing apart, I would
hope one of the ubitx experts can provide an answer to this.

Thank You,
Joe Milosch, KN4OND, Mauk, GA, USA

Re: #ubitx. Increasing power output

MadRadioModder
 

2N3866’s work even better…

 

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Skip Davis via Groups.Io
Sent: Friday, August 17, 2018 1:35 PM
To: BITX20@groups.io
Subject: Re: [BITX20] #ubitx. Increasing power output

 

Bo have you tried the 2N2222A or 2N2219’s yet? Although I haven’t added sockets I did replace all 2N3904s with 2N2222A starting with Q90. My output has increased on the upper bands. 

Skip Davis, NC9O


On Aug 17, 2018, at 11:59, Bo Barry <bobarr@...> wrote:

 I know this is an old topic, but I want to do some SIMPLE tinkering & learning.
I put 'socket pins' in for the 6 3904s thinking I could simply find some 'hotter' replacements. 🤔

Well I tried some 5109 and 2369s found on eBay. No noticeable improvements noted.

Then I tried my hand with LTSPICE, having used in since the 60's and taught it until '06.  One of the transistors was in their library and I think I added the model for the 5109 correctly.
Not sure my setup is 100%, but I did get similar dismal results.
Anyone have some transistor types that may work. 
Not interested in other mods YET. 
I used to be addicted (and very skilled) in several versions if SPICE. Still have the MicroSim version somewhere.
Bo W4GHV 
  


Virus-free. www.avg.com

--

…_. _._

Re: uBITx intermittent cw transmit

Howard Fidel
 

Joe:
Take your voltmeter and monitor the voltage at the blue wire pin 2 on the Raduino. It should be ~ 0 volts when the key is pressed and +5V when not pressed. If it isn't you have a wiring issue, if it is possible Raduino issue.

Howard

On 8/17/2018 3:15 PM, Joe Milosch wrote:
Hi,
I recently built my ubitx, and after assembling
it received perfectly.  I just got my HAM license,
so I decided to see how the cw key function worked.
There seems to be a problem.

I am using the stock software which came with my
July 2018 delivered ubitx.

The PTT function works perfectly, just the slightest ground
puts the ubitx into Tx voice mode.

With CW, the story is different. 
First, the instructions are pretty shoddy, and only because
I could trace the wires from pictures in some setup instructions
was I able to figure out the wiring to the various 1/8'' female 
connector sockets.

I found there was no mention of the keyer socket PIN 3 connection
to the yellow ground wire of the Arduino, and it seems that
I needed to make a wire jumper to connect the keyer socket ground
to the Arduino yellow wire at PIN 4, the Arduino ground.
I guess they assumed a metal chassis would make the connection?
I have a plastic chassis.

So OK, got that glitched fixed and I fully expected it to work.
I had 5 volts connected to the 4.7k resistor, and the blue and green
wire connections were correct.

When I tried to key, nothing happened. I thought it might be a dirty
straight key, so I tried monmentarily jumpering the blue wire to
ground. It correctly went from 5v to 0v on each contact.

Now this is the weird part. If I repeatedly touched the blue wire
to Arduino ground ( yellow wire ), the cw tx mode would suddenly
start, with TX power and proper sidetone, then suddenly stop.

There is no pattern to trigger it. If I repeatedly touched and 
shorted the blue to yellow ground, I would randomly get
a burst of dits and dahs, then it would stop. I could repeat this
over and over, but without finding a definite pattern.

I thought maybe the Arduino board had a bad solder joint,
or some other intermittent problem, but I'm also wondering
if the stock software is flawed in the cw portion, and the Arduino
is having a hard time detecting the voltage drop of the key.

Before I go any further in ripping this thing apart, I would
hope one of the ubitx experts can provide an answer to this.

Thank You,
Joe Milosch, KN4OND, Mauk, GA, USA







































Re: N6ALT: Nextion 3.2 inch Enhanced display not displaying right

Joe
 

Hi,

You need to goto ubitx.net and download the nextion 3.2 file
These are files modified to support your full screen.
There are nextion files for 3.5 and 7 inch

Joe
VE1BWV
Joe

On Fri, Aug 17, 2018, 3:39 PM SV9CVJ Nikos <sv9cvj@...> wrote:
Official Support GUI is for  2.4", 2.8" LCD, but include 3.2, 3.5 for test (just converted from 2.8")                                                                                                                                                                                                                                                                                                   

Re: #ubitx SSM2167 mic compressor speaker feedback issue - resolved #ubitx

Kevin Rea
 

hi John,
thanks from everyone for the schematic.
I made a larger copy for everyone just in case it helps.

Kevin Rea