Date   
Re: Harmonic performance - SSB vs CW

ajparent1/KB1GMX <kb1gmx@...>
 

Warren,

Not so much disagree as wow! that's terrible... can't be!  Yes, its horrific.

5 images.
NF1 is RX mode with no filters (default is 30mhz) selected and RF applied at TX amp output
and measured at antenna connector.  It is really bad!  What is acceptable is not less
than 70db.  it was also why when I got the amp flat in gain it would oscillate as the output
was more than adequately coupled to the input to support oscillation.  Which is why
I cut the board in half (rear section amp and filters) then that in half with filters separated.
Layout issues abound!

F3.5 is TX mode, 3.5mhz filter selected.  The blow by limits us to barely 25DB at 30mhz.
F70 is tx mode, 7mhz filter selected.  Blow by limits us to maybe 25db.
F21 is tx with 21mhz filter selected. blow by limits us to about 30db at 30mhz, not impressive.
F300 is TX with last filter 30mhz, span extened to 50mhz so we can see it.  at 45mhz we 
are barely 30db down.

Results, we can argue magnitude but over all the filters are unacceptable in situ.
The first one (NF1) was the one that caught my eye as its pure blow by as there is no
direct path its all random coupling.  That has to be much better before we even 
consider filters.

At this point I'd rip out the filters and the relays and even the TR relay (KT1-3 and K3)
and route everything to an external low pass board.  At that point I think we have a chance
with the external board performance being unknown but for certain cannot be worse.

Re: One question only...

iz oos
 

To answer the original question, if it might be illegal, make it legal. My solution is using plug and play external low pass filters. And to avoid the issue of spurs pointed out by Allison I don't use SSB on 15 and 12m. For 10 meters I also added a high pass filter.


Il 06/ago/2018 16:42, "Scott McDonald via Groups.Io" <ka9p=aol.com@groups.io> ha scritto:
Hi Allison,
 
Do you have an opinion on whether the 5351 with bandpass filters like the QRP Labs set up is good enough for SWR and filter BW?
 
Thanks, Scott
 
 
-----Original Message-----
From: ajparent1/KB1GMX <kb1gmx@...>
To: BITX20 <BITX20@groups.io>
Sent: Mon, Aug 6, 2018 8:51 am
Subject: Re: [BITX20] One question only...

I used to use a signal generator (analog), frequency counter, and a diode load
so adding even a digital oscillator DDS or NCO was a giant step forward in
making basic measurements.

If a SA at ~1500$US is out of reach the lowly 9850 DDS and arduino plus a
RF power sensor (8307 or one of the many others) will allow many of the
same measurements at a fraction of the cost in exchange for time to plot
the points.

It is also possible to use the above to plot to a graphic display 
by taking the power sensor output to the analog input of the arduino
allowing graphic display of the results. 

The 5351 is good but the square wave output will mess you up for many
measurements due to the rich harmonic output.  Two common measurements
are SWR and filter bandwidth/cutoff are hard to do with harmonics present.

Allison


Re: VU2SPF - TFT_TouchScreen_for_uBitx -- CAT, Split, UP/Down Scan, V2.9BU Released with New User Manual

Rob Bleumer <Bleumer@...>
 

7:45am   

Hello SP VU2SPF and Joe VE1BWV,
Im installing your very affordable touch screen. After som trail and error my disply works great.
Untill now I'm impresed with your documentation. I'm almost 68 years old and learning a lot from it.
I got a few questions:
1. Are you still working on improving the software and in which direction?
2. Can I use the KD8CEC LM386 S meter plan as input for pin 66?
3. Could the huge amount of data pins from the Mega 2560 be used to drive a LPB for each of the HAM bands separately? 

Re: VU2SPF - TFT_TouchScreen_for_uBitx -- CAT, Split, UP/Down Scan, V2.9BU Released with New User Manual

Rob Bleumer <Bleumer@...>
 

Sorry, No edit posibility...
So you can make an optimal extra LPF board with relay for every Ham Band?
Idea?
Greatings
Rob P J R Bleumer
PA0RBL

Re: VU2SPF - TFT_TouchScreen_for_uBitx -- CAT, Split, UP/Down Scan, V2.9BU Released with New User Manual

Rob Bleumer <Bleumer@...>
 

Hello SP VU2SPF and Joe VE1BWV,
Im installing your very affordable touch screen. After som trail and error my disply works great.
Untill now I'm impresed with your documentation. I'm almost 68 years old and learning a lot from it.
I got a few questions:
1. Are you still working on improving the software and in which direction?
2. Can I use the KD8CEC LM386 S meter plan as input for pin 66?
3. Could the huge amount of data pins from the Mega 2560 be used to drive a LPB for each of the HAM bands separately? 






Re: One question only...

Scott McDonald
 

Hi Allison,
 
Do you have an opinion on whether the 5351 with bandpass filters like the QRP Labs set up is good enough for SWR and filter BW?
 
Thanks, Scott
 
 

-----Original Message-----
From: ajparent1/KB1GMX <kb1gmx@...>
To: BITX20 <BITX20@groups.io>
Sent: Mon, Aug 6, 2018 8:51 am
Subject: Re: [BITX20] One question only...

I used to use a signal generator (analog), frequency counter, and a diode load
so adding even a digital oscillator DDS or NCO was a giant step forward in
making basic measurements.

If a SA at ~1500$US is out of reach the lowly 9850 DDS and arduino plus a
RF power sensor (8307 or one of the many others) will allow many of the
same measurements at a fraction of the cost in exchange for time to plot
the points.

It is also possible to use the above to plot to a graphic display 
by taking the power sensor output to the analog input of the arduino
allowing graphic display of the results. 

The 5351 is good but the square wave output will mess you up for many
measurements due to the rich harmonic output.  Two common measurements
are SWR and filter bandwidth/cutoff are hard to do with harmonics present.

Allison

Re: One question only...

Bill Cromwell
 

Hi Walt,

From what I have seen in these threads about spurs, harmonics, and (lack of) filtering the troublesome unintended 'signals' are just about at the legal limit and slightly over. Over is over. Unacceptable. The way I use my radio I think the trash can be sufficiently cleaned up for 'safe', responsible use. It would be much better if that cleanup took place inside the radio and by design. It is too late for that. Later I might do some of my own investigation and attempt to correct the deficiencies. Maybe just follow what somebody else comes up with. But please don't hold your breath. I have other irons in the fire:)

I haven't modded mine at all yet and none of the mods for 'more power' is on my agenda. I like some of the features available in the CEC software. And something *must* be done about that million decibel side tone. OMG. I cracked a shop window with that thing!

I have other gear and will be buying more. Hans Summers's QCX and some other toys from his shop are on my hit list. If uBitx hadn't shown up in my world I would already be using some of those. When I decided to buy the uBitx first it was not a rejection of the QCX:) Those are next.

73,

Bill KU8H

Michigan QRP Club

On 08/06/2018 09:45 AM, WaltR wrote:
Thanks Bill,

I, as many others enjoyed assembling the bitx40 and the ubitx, for my
purposes, dragging around a bag full of outboard filters and other
accessories will not work. Perhaps to some degree I am spoiled by having
access to high end gear, but I am aware that it’s not prudent to compare
a Harris to a ubitx. I wish not to besmirch Harris by putting the ubitx
in the same sentence.

my understanding is the bitx was designed and built as a kit for those
that wish to assemble, experiment, dabble in Arduino sketches etc, and
by the number that have been sold obviously has a large following.
There is a need for a simple solid rig that doesn’t require a lot of
fiddling about, and is reasonably priced and meets regulatory criteria.

There should be some warning or reminder that if you plan on doing any
modifying or hacking that you should ensure that you don’t produce any
transmitted products that may interfere with other services, especially
any that might fall in the spectrum allocated to government agencies and
services, as well as commercial, and international interests. You might
get away with it in the ham bands but you certainly won’t if you cause
superfluous transmissions in other spectrum allocations.

Buy filters, there are some great little devices available at QRP LABS.

Cheers and 73

WRS

IF THE PROCESS IS FLAWED, THE OUTCOME MOST SURELY WILL BE FLAWED
--
bark less - wag more

Re: microphone

Ian Reeve
 

I do await a 8 pin chassis mount mic socket and will wire it for  the Icom pinout. I have a couple of Icom desk mics to try but in the world of experimentation, I like to have a standby electret module in case the mics are not a good match.

Ian M0IDR

 

Sent from Mail for Windows 10

 


From: BITX20@groups.io <BITX20@groups.io> on behalf of Denis <wb8skp@...>
Sent: Monday, August 6, 2018 3:14:43 PM
To: BITX20@groups.io
Subject: Re: [BITX20] microphone
 

Here is what I did with my BITX40. Installed an 8 pin microphone jack and use the mic from IC7300. It works good.

Denis, WB8SKP


On 8/6/2018 6:10 AM, Ian Reeve wrote:
There are available on eBay very neat ready built electret mic amplifiers,either with automatic gain or a manually adjust version.I intend to try one of these to boost the audio on Ssb.Will update once I try it out. 73. M0IDR


From: BITX20@groups.io <BITX20@groups.io> on behalf of pat griffin <patgriffin@...>
Sent: Sunday, August 5, 2018 8:42:41 PM
To: BITX20@groups.io
Subject: Re: [BITX20] microphone
 

Terry,

I went down that same road and the dynamics I tried had not enough gain.  I ended up using the stock electret mic but I shorted R63 and replaced R64 with a 250 ohm resistor in series with a 1 k pot for a mic gain control.   I got lucky at a hamfest and picked up a nice Heil headset with no ends for something like $10, took out the good HC5 element, and mounted the stock ubitx electret inside.  It works fine, looks good on the scope, and I have gotten no bad audio reports.  By the way, the Heil HC5 didn't have enough gain either as I recall.

Just my mileage.

73,

Pat AA4PG



From: BITX20@groups.io <BITX20@groups.io> on behalf of Arv Evans <arvid.evans@...>
Sent: Sunday, August 5, 2018 11:20:37 AM
To: BITX20@groups.io
Subject: Re: [BITX20] microphone
 
Terry

You probably can use that 400 ohm dynamic mike with the BITX, providing you make
the necessary mods to make it compatible with the microphone amplifier input circuit. 
If your dynamic microphone puts out significantly less than 45 millivolts you may need
to mod the BITX mike amplifier to have more gain, or less gain...as necessary.  The
microphone that is provided with the uBITX is proper for the transceiver, so why not
use it?

Arv
_._


On Sun, Aug 5, 2018 at 7:58 AM terryhugheskirkcudbright via Groups.Io <terryhugheskirkcudbright=yahoo.co.uk@groups.io> wrote:
Can i use a dynamic mike with 400 ohms measures resistance with the ubitx or the bitx40

i have not ordered yet - i am trying to make up my mind which one to buy

terry

Re: microphone

Dennis Yancey
 

Try this link. 
https://ubitx.net/mod-tx-compression/


--
72 and God bless
KD4EPG

Re: microphone

Denis
 

Here is what I did with my BITX40. Installed an 8 pin microphone jack and use the mic from IC7300. It works good.

Denis, WB8SKP


On 8/6/2018 6:10 AM, Ian Reeve wrote:
There are available on eBay very neat ready built electret mic amplifiers,either with automatic gain or a manually adjust version.I intend to try one of these to boost the audio on Ssb.Will update once I try it out. 73. M0IDR


From: BITX20@groups.io <BITX20@groups.io> on behalf of pat griffin <patgriffin@...>
Sent: Sunday, August 5, 2018 8:42:41 PM
To: BITX20@groups.io
Subject: Re: [BITX20] microphone
 

Terry,

I went down that same road and the dynamics I tried had not enough gain.  I ended up using the stock electret mic but I shorted R63 and replaced R64 with a 250 ohm resistor in series with a 1 k pot for a mic gain control.   I got lucky at a hamfest and picked up a nice Heil headset with no ends for something like $10, took out the good HC5 element, and mounted the stock ubitx electret inside.  It works fine, looks good on the scope, and I have gotten no bad audio reports.  By the way, the Heil HC5 didn't have enough gain either as I recall.

Just my mileage.

73,

Pat AA4PG



From: BITX20@groups.io <BITX20@groups.io> on behalf of Arv Evans <arvid.evans@...>
Sent: Sunday, August 5, 2018 11:20:37 AM
To: BITX20@groups.io
Subject: Re: [BITX20] microphone
 
Terry

You probably can use that 400 ohm dynamic mike with the BITX, providing you make
the necessary mods to make it compatible with the microphone amplifier input circuit. 
If your dynamic microphone puts out significantly less than 45 millivolts you may need
to mod the BITX mike amplifier to have more gain, or less gain...as necessary.  The
microphone that is provided with the uBITX is proper for the transceiver, so why not
use it?

Arv
_._


On Sun, Aug 5, 2018 at 7:58 AM terryhugheskirkcudbright via Groups.Io <terryhugheskirkcudbright=yahoo.co.uk@groups.io> wrote:
Can i use a dynamic mike with 400 ohms measures resistance with the ubitx or the bitx40

i have not ordered yet - i am trying to make up my mind which one to buy

terry

Re: microphone

Dennis Yancey
 

On the uBitx website, there is a great explanation of how to use the amplifier board for uBitx by John, WK2ETA. 
--
72 and God bless
KD4EPG

Re: One question only...

ajparent1/KB1GMX <kb1gmx@...>
 

I used to use a signal generator (analog), frequency counter, and a diode load
so adding even a digital oscillator DDS or NCO was a giant step forward in
making basic measurements.

If a SA at ~1500$US is out of reach the lowly 9850 DDS and arduino plus a
RF power sensor (8307 or one of the many others) will allow many of the
same measurements at a fraction of the cost in exchange for time to plot
the points.

It is also possible to use the above to plot to a graphic display 
by taking the power sensor output to the analog input of the arduino
allowing graphic display of the results. 

The 5351 is good but the square wave output will mess you up for many
measurements due to the rich harmonic output.  Two common measurements
are SWR and filter bandwidth/cutoff are hard to do with harmonics present.

Allison

Re: One question only...

WaltR <waltrseiler@...>
 

Thanks Bill,

I, as many others enjoyed assembling the bitx40 and the ubitx, for my purposes, dragging around a bag full of outboard filters and other accessories will not work. Perhaps to some degree I am spoiled by having access to high end gear, but I am aware that it’s not prudent to compare a Harris to a ubitx. I wish not to besmirch Harris by putting the ubitx in the same sentence.

my understanding is the bitx was designed and built as a kit for those that wish to assemble, experiment, dabble in Arduino sketches etc, and by the number that have been sold obviously has a large following.
There is a need for a simple solid rig that doesn’t require a lot of fiddling about, and is reasonably priced and meets regulatory criteria.

There should be some warning or reminder that if you plan on doing any modifying or hacking that you should ensure that you don’t produce any transmitted products that may interfere with other services, especially any that might fall in the spectrum allocated to government agencies and services, as well as commercial, and international interests. You might get away with it in the ham bands but you certainly won’t if you cause superfluous transmissions in other spectrum allocations.

Buy filters, there are some great little devices available at QRP LABS.

Cheers and 73

WRS

IF THE PROCESS IS FLAWED, THE OUTCOME MOST SURELY WILL BE FLAWED

Re: Harmonic performance - SSB vs CW

Warren Allgyer <allgyer@...>
 

Allison

The 20 dB figure was for the filter assembly as a whole and not just for a discrete filter. Since that post I have cleaned up the measurement and reposted filter sweeps in situ as well as a measurement of the relay itself. Those updated measurements are posted. 

I am very sure the filter itself is more than adequate even with the high harmonic content CW. It is the relays and surrounding circuitry that allow the crosstalk. 

WA8TOD

Re: One question only...

ajparent1/KB1GMX <kb1gmx@...>
 

Gordon,

The Rigol DSA815T I bought one to back up my HP8568B because the HP does not
have a tracking generator and finding a working one was approaching the price of a Rigol.
While I still prefer the HP the Rigol does work well has modern interefaces for remote
control and screen capture/storage.  Being an easy 60 pounds lighter is portable. 
I've even run it on a small 200W inverter and 33ah battery in the field (it uses maybe
50W).

The tracking generator that was the desired feature and it makes the instrument
a good second place for things I'd want a PNA like the Agilent 8357A for.  That
is things like  SWR analysis, 1 and 2 port network analysis. 

The tracking generator is worth the cost difference.
That's a lot of capability in a small box.

When you consider that many hams spend 1000-2000 for a mid range radio
and more the 1560$ (via amazon) was a reasonable ham purchase and a
dirt cheap professional one.

Allison

Re: One question only...

G8HAV
 

I know it is off topic but I used a DG8SAQ VNWA  for the duplexers.


Depends on whether they are pass. reject or a mixture of these, on how you proceed


SA &  tracking gen is easier but five or more times expensive.


From: BITX20@groups.io <BITX20@groups.io> on behalf of Gordon Gibby <ggibby@...>
Sent: 06 August 2018 14:14:38
To: BITX20@groups.io
Subject: Re: [BITX20] One question only...
 

yup --- agreed.   Need to have a pair of hemostats or something to protect the center insulation.   But somehow I did it as a teenager causue heathkit used those a lot.   


we seem to have a lot of hams today who aren't even up to the level of heathkit assemblers, and it is good to improve onthat!!!!


this forum has taught me a ton...


I saw the price of a Rigol 700....I might be able to swing it....   the 800 's seem to have the tracking generator but then the price is $500 higher..... is it worth it?    Or can I somehow use a si5351 below 100 MHz?


I am getting a little unit that is supposed to let me tune duplexers ($100 cheapie system from china)



gordon



From: BITX20@groups.io <BITX20@groups.io> on behalf of ajparent1/KB1GMX <kb1gmx@...>
Sent: Monday, August 6, 2018 8:45 AM
To: BITX20@groups.io
Subject: Re: [BITX20] One question only...
 
Gordon,

I have a 1k spool of it...  Doesn't mean I expect others less experienced to find it easy.
For some it might be the first time.  

Allison

Re: 3,2: Nextion Display

OldEngineer
 

I am certainly not an expert but stand taller when I am on the shoulders of others!  Recently trying to find out how to "expand" the display to make use of my 4.2" I believe I may have your answer.  With your current file loaded into the Nextion Editor select the Device ID tab on the top.  That will pull up the list of devices supported, most likely with your highlighted as well as the Basic and Enhanced buttons.  On the left side you will see DISPLAY.  Click on that and you can select one of the four possible orientations.  Close that menu and back at the top find the Compile button, click that.  Then in the very top menu select File, Open Build Folder and you will find the edited .tft file to install in your display.  Hope you find this correct, let me know.

Re: Raduino Clone kit from W0EB-N5IB #ubitx

Jim Sheldon
 

REALLY wish this reflector allowed editing of posts!!!!

I meant to add that the 2.7K resistors are pulled up to the 3.3 Volt rail out of the NANO, not to the 5 Volt rail which keeps the SDA and SCL signals to 3 volts or less and they provide a stiff enough pull up that any overshoots don't exceed the 3.6Volt MAX spec for the Si5351a.  If this weren't the case MANY of the factory Raduinos (over 5000 of them out there since the beginning) would be toast so this is not a worry.

Jim, W0EB

Re: One question only...

Gordon Gibby <ggibby@...>
 

yup --- agreed.   Need to have a pair of hemostats or something to protect the center insulation.   But somehow I did it as a teenager causue heathkit used those a lot.   


we seem to have a lot of hams today who aren't even up to the level of heathkit assemblers, and it is good to improve onthat!!!!


this forum has taught me a ton...


I saw the price of a Rigol 700....I might be able to swing it....   the 800 's seem to have the tracking generator but then the price is $500 higher..... is it worth it?    Or can I somehow use a si5351 below 100 MHz?


I am getting a little unit that is supposed to let me tune duplexers ($100 cheapie system from china)



gordon



From: BITX20@groups.io <BITX20@groups.io> on behalf of ajparent1/KB1GMX <kb1gmx@...>
Sent: Monday, August 6, 2018 8:45 AM
To: BITX20@groups.io
Subject: Re: [BITX20] One question only...
 
Gordon,

I have a 1k spool of it...  Doesn't mean I expect others less experienced to find it easy.
For some it might be the first time.  

Allison

Re: Raduino Clone kit from W0EB-N5IB #ubitx

Gary Anderson
 

Glen, concerned about your logic level translator implementation w.r.t. I2C bus.  This is an open drain bus.  Nothing should be actively driven High.  The high state is handled by pull-up resistors.  Pull-up to 3.3V from Si5351 supply.   If one part is actively driving HIGH and another part on the bus drives LOW, there is bus contention with high currents on the I/Os which could lead to part destruction.  

Rgds,
Gary