Date   
Re: Antuino support group opened -- early antuino question

Jerry Gaffke
 

The Antuino looks like a useful tool, well packaged.
I plan to get one.

But it won't be a replacement for your MFJ  power meter and SWR meter.

As Farhan pointed out, it would be very inconvenient to keep the Antuino tuned into
the frequency of the transmitter, the Antuino only sees one frequency at a time where
the MFJ is broadband.  And while the Antuino can measure the SWR of your antenna,
I don't think it can measure the SWR of an antenna while the transmitter is connected.

It could be used to measure the power coming out of a transmitter if you have
an appropriate resistive attenuator between the transmitter and the Antuino.
A small wire antenna on the Antuino might be used instead of the attenuator, but
the signal level seen by the Antuino will then vary with frequency and distance and
where your cat happens to be sitting.

Be very careful if using the Antuino around a transmitter, it would be easy
to feed it too much power and blow it out.

Jerry, KE7ER

 

On Tue, Aug 13, 2019 at 06:50 PM, Ashhar Farhan wrote:
Don,
The answer is yes, but ... the Antuino needs to be tuned within 10 khz of the ubitx to receive and display the modulation.
Being as sensitive as it is, you dont even need to connect it with the tap. A small piece of wire in the RF IN will pick up thr ubitx transmission.
- f
 
Hide quoted text

 

On Wed 14 Aug, 2019, 1:24 AM Don - KM4UDX, <dontAy155@...> wrote:
I have an early question (even before the support groups gets up and running...hahaha)

Is the Antuino able to be left in line with a tap & pad or something as a semi permanent basis to my uBITX? Right now I have an old MFJ power/SWR meter hooked up after the uBITX and before the antenna.  Is there a way to replace the swr/pwr meter with the  Antunio?

thanks!

Don
km4udx

Re: Issues with ordering the BITX40

MVS Sarma
 

At the 2nd link, below the photo you can see "BUY" button. Us e it to rea h ordering page.

On Tue, 13 Aug 2019, 11:25 pm Jerry Gaffke via Groups.Io, <jgaffke=yahoo.com@groups.io> wrote:

I'm still not seeing any way to buy a raduino from hfsignals.com.

I see that the home page describes the "uBitx":
    http://www.hfsignals.com/
When I click uBitx at the top it takes me to a different page for the "MBITX":
    http://www.hfsignals.com/index.php/ubitx/

Those two pages describe the same radio with most of the same section headers,
but give significantly different information.
I sort of know what's going on here, but have no idea which page is more current
without spending 15 minutes carefully comparing the two.
I suggest that the homepage just have a brief summary of all the various products:
  Bitx40, uBitx, Raduino, Antuino
plus a "Buy" button for all of them, a description of the company, and where to find the forum.

A page for each should fully describe the product, and tell us what the previous versions
of that product were.  For example, the Raduino page should make it clear that the previous
version was for the Bitx40 only, and that the connector has been changed to accommodate both
the uBitx and the Bitx40.  Also a pointer to where firmware and schematics and such are archived.

We get lots of traffic here in the forum wondering about versions of the various products,
how to plug a new Raduino into a Bitx40, what version of Bitx40 they have,
mods they should do, how and when to contact hfsignals.  That should all be on the website.

Jerry, KE7ER


On Fri, Aug 2, 2019 at 05:52 PM, Ashhar Farhan wrote:
I think that paypal has tweaked something and the old style button had stopped working. I will fix the raduino too.
- f

Re: Narrow filter for CW #ubitxcw

_Dave_ K0MBT
 

Ash
Does this option work on the V3 or V4 radios as well. Now to source more data on this option.

Evan
Yes as I mentioned I have the nextion display on most of my ubitx radios. I noticed that the IF shift when slid from one side to the other can make certain tones disappear and reappear I guess I should move it to one side or the other and see if I can use it to isolate. I assume it is a one way shift on the receive side only.

Thanks to all that wrote thoughtful replies.

On Mon, Aug 12, 2019 at 08:10 PM, Ashhar Farhan wrote:


The ubitx has an option for narrow band filter. There are pins to install it.
The way it works is a bit of a hack :
1. The CW filter is at a different frequency. Let's imagine it is at 4.915
MHz. It is installed parallel to the 11.059 MHz SSB filter.
2. When choosing CW filter, you have to switch the second conversion
oscillator from 56.059 Mhz (45 + 11.059) to 49.915 Mhz (45 +4.915). Shift the
BFO to 4.914500 (According to your taste of CW tone).
Apart from designing the crystal filter, this hack is mostly about software
changes.

Re: Issues with ordering the BITX40

MVS Sarma
 


On Wed, Aug 14, 2019 at 3:25 PM MVS Sarma via Groups.Io <mvssarma=gmail.com@groups.io> wrote:
At the 2nd link, below the photo you can see "BUY" button. Us e it to rea h ordering page.

On Tue, 13 Aug 2019, 11:25 pm Jerry Gaffke via Groups.Io, <jgaffke=yahoo.com@groups.io> wrote:
I'm still not seeing any way to buy a raduino from hfsignals.com.

I see that the home page describes the "uBitx":
    http://www.hfsignals.com/
When I click uBitx at the top it takes me to a different page for the "MBITX":
    http://www.hfsignals.com/index.php/ubitx/

Those two pages describe the same radio with most of the same section headers,
but give significantly different information.
I sort of know what's going on here, but have no idea which page is more current
without spending 15 minutes carefully comparing the two.
I suggest that the homepage just have a brief summary of all the various products:
  Bitx40, uBitx, Raduino, Antuino
plus a "Buy" button for all of them, a description of the company, and where to find the forum.

A page for each should fully describe the product, and tell us what the previous versions
of that product were.  For example, the Raduino page should make it clear that the previous
version was for the Bitx40 only, and that the connector has been changed to accommodate both
the uBitx and the Bitx40.  Also a pointer to where firmware and schematics and such are archived.

We get lots of traffic here in the forum wondering about versions of the various products,
how to plug a new Raduino into a Bitx40, what version of Bitx40 they have,
mods they should do, how and when to contact hfsignals.  That should all be on the website.

Jerry, KE7ER


On Fri, Aug 2, 2019 at 05:52 PM, Ashhar Farhan wrote:
I think that paypal has tweaked something and the old style button had stopped working. I will fix the raduino too.
- f

Re: Antuino support group opened -- early antuino question

Don - KM4UDX
 

Ashhar and Jerry -- thank you so much for the reply and info.  I better understand the general antuino application.  It is not a inline SWR/pwr meter, but it does a thousand other equally or more important jobs.  I'm always borrowing VNA from club members.  When I get a Antunio, I can stop being a pain in the neck to others. hahah.

P.S. I showed your email to my wife, and breathlessly exclaimed...look at this...Ashhar wrote to me!!!!  I did a little dance and told her I would never delete his email. [Obviously I need to get out more, but it is nice to have a few heroes out there, and you fit the bill. So a thousand thanks for all you've accomplished for all of us.  Okay, now I will stop sucking up. hahah.]

Don
km4udx

Re: Narrow filter for CW #ubitxcw

Curt
 

Dave

I sense we have thrown lots of choices at you.  Except for playing with IF shift, implementing an audio filter is easiest - with many low cost choices around.  Note in most respects the design architecture is very similar across v3, v4 and v5.  v5 was a larger change with a different IF selection for the SSB crystal filter. 

Many of us have rigs with 4915 kHz xtal filters made from cheap xtals.  Sounds like it could be installed in parallel with the 12 MHz filter without needing relays -- I should have thought of that - but we need a rig control to command the ubitx to 'Receive CW' to change the oscillator functions as Asher describes. 

Except in a major contest maybe, I find the audio filter is entirely sufficient with the way ubitx receive gain is distributed.  You might find CW transmit behavior a bit strange but it works fine once you are used to it. 

Curt

Re: Antuino support group opened -- early antuino question

Evan Hand
 

I have ordered my Antunio, and am waiting for delivery, anxious to try it out .  The above comment from Don raises one question for me:  Is it a VNA or SNA.  As I understand the difference is that the VNA measures the phase angle as well as the magnitude of the impedance, an SNA just measures the magnitude of the impedance.  in reading the description on the HF Signals Web Page it states SNA capabilities.

As far as output, you can get a Smith Chart from a VNA, not from an SNA.

So the question is if the hardware would support a VNA application, and and if so does the software provided have both the real and imaginary values of the impedance?

73
Evan
AC9TU

Re: Issues with ordering the BITX40

Ken
 

Could this be the Raduino link?

https://amateurradiokits.in/product/raduino-clone/

73

Ken VA3ABN

Re: Narrow filter for CW #ubitxcw

iz oos
 

I guess an audio active filter 200hz wide like the Hipermite by 4SQRP might suffice.


Il 14/ago/2019 19:59, "Curt via Groups.Io" <wb8yyy=yahoo.com@groups.io> ha scritto:
Dave

I sense we have thrown lots of choices at you.  Except for playing with IF shift, implementing an audio filter is easiest - with many low cost choices around.  Note in most respects the design architecture is very similar across v3, v4 and v5.  v5 was a larger change with a different IF selection for the SSB crystal filter. 

Many of us have rigs with 4915 kHz xtal filters made from cheap xtals.  Sounds like it could be installed in parallel with the 12 MHz filter without needing relays -- I should have thought of that - but we need a rig control to command the ubitx to 'Receive CW' to change the oscillator functions as Asher describes. 

Except in a major contest maybe, I find the audio filter is entirely sufficient with the way ubitx receive gain is distributed.  You might find CW transmit behavior a bit strange but it works fine once you are used to it. 

Curt


Re: Narrow filter for CW #ubitxcw

Evan Hand
 

I am traveling on business, so can not get at the documentation on the CEC software.  From memory I am sure that one of the control shifts the signal on the "roofing" 45 mhz filter to act as a gain control.  The filter skirts of the single crystal would be more gradual than the sharper skirts on the 12/11 mhz SSB filter.  The other is moving the BFO to change where the signal is received relative to the SSB passband.  I just do not remember which one is which without the documentation.  

Since you are moving the center of the signal across the pass band of the filter you should be able to move the signal up against one side or other of the skirt of the SSB filter to narrow the received signal.  My use of the CEC sliders has not been very precise.  To make the software work more efficiently for the operator, I would look at adding another encoder in place of the Nextion slider.  Issue is what I/O do you give up to connect it to.  Another option would be to use a switch to toggle the frequency encoder to do both frequency and IF shift.  Would be better than what I have used on the Nextion screen.  Response there is not always accurate.

Above are just ramblings.  Please take with a grain of salt.

73
Evan
AC9TU

Re: Narrow filter for CW #ubitxcw

 

I use a simple sofa beams filter in my audio chain. It works fantastic. Check it out at https://www.dxengineering.com/parts/sbm-lb-module-cw?seid=dxese1&gclid=EAIaIQobChMI1dqE3puD5AIVA9vACh1ZLg6MEAQYASABEgJYifD_BwE.

David Posthuma
WD8PUO

 


From: bitx20@groups.io on behalf of Evan Hand <elhandjr@...>
Sent: Wednesday, August 14, 2019 4:30 PM
To: bitx20@groups.io
Subject: Re: [BITX20] Narrow filter for CW #ubitxcw
 
I am traveling on business, so can not get at the documentation on the CEC software.  From memory I am sure that one of the control shifts the signal on the "roofing" 45 mhz filter to act as a gain control.  The filter skirts of the single crystal would be more gradual than the sharper skirts on the 12/11 mhz SSB filter.  The other is moving the BFO to change where the signal is received relative to the SSB passband.  I just do not remember which one is which without the documentation.  

Since you are moving the center of the signal across the pass band of the filter you should be able to move the signal up against one side or other of the skirt of the SSB filter to narrow the received signal.  My use of the CEC sliders has not been very precise.  To make the software work more efficiently for the operator, I would look at adding another encoder in place of the Nextion slider.  Issue is what I/O do you give up to connect it to.  Another option would be to use a switch to toggle the frequency encoder to do both frequency and IF shift.  Would be better than what I have used on the Nextion screen.  Response there is not always accurate.

Above are just ramblings.  Please take with a grain of salt.

73
Evan
AC9TU

Re: Antuino support group opened -- early antuino question

Jerry Gaffke
 

Evan,

Looking at the Antuino schematic, it has an AD8307 at the output of the 25mhz filter
to tell the processor the magnitude of the received signal.
Nothing to tell the processor anything about phase.
So it's an SNA (Scaler Network Analyzer), not a VNA (Vector Network Analyzer)

You might think it needs both phase and magnitude to determine the SWR of an antenna.
But no, it uses a bridge circuit, and senses the difference between what the antenna does
to the signal and what a 50 ohm resistor does to the signal.  It assumes a 50 ohm environment.  
From post    https://groups.io/g/BITX20/message/63034
  I suppose R21,R29,R16, and an antenna on P3 would form a balanced
  bridge when the antenna is 50 ohms, CLK1 is driving the antenna and the top of the bridge.
  The ADE-1 RF port sees any imbalance across the bridge.
  CLK2 into the LO port is 25mhz above (or below) CLK1.

The cheapest VNA that I am aware of is the Vector Impedance Analyzer kit that Kees sells,
toward the bottom of this webpage:     http://www.qsl.net/k5bcq/Kits/Kits.html
Some other VNA's mentioned here:  https://groups.io/g/BITX20/message/56219
But I haven't looked over what's available out there for several years.

Jerry, KE7ER



On Wed, Aug 14, 2019 at 01:14 PM, Evan Hand wrote:
I have ordered my Antunio, and am waiting for delivery, anxious to try it out .  The above comment from Don raises one question for me:  Is it a VNA or SNA.  As I understand the difference is that the VNA measures the phase angle as well as the magnitude of the impedance, an SNA just measures the magnitude of the impedance.  in reading the description on the HF Signals Web Page it states SNA capabilities.

As far as output, you can get a Smith Chart from a VNA, not from an SNA.

So the question is if the hardware would support a VNA application, and and if so does the software provided have both the real and imaginary values of the impedance?

Re: Antuino support group opened -- early antuino question

Evan Hand
 

Jerry,

Thank-you for the clarification. 

I was aware that you can measure SWR with just the scaler values, as I have built a resistor bridge based scanning SWR antenna analyzer, and purchased a cheap VNA with Smith chart capability.  I wanted to make sure that I had not missed something based on Don's mention of using the VNA capability of the Antuino  

73
Evan
AC9TU
AC9TU

Re: Antuino support group opened -- early antuino question

Doug W
 

If you're looking for a cheap VNA this might be of interest.
https://groups.io/g/antennas/topic/nanovna_cheap_vna_on/31731387

I don't consider this to be competition at all for the Antuino.
--
www.bitxmap.com

Re: Issues with ordering the BITX40

JT Croteau
 

Ken, that is the Raduino clone by Sunil.


On Wed, Aug 14, 2019, 15:26 Ken <chase8043@...> wrote:
Could this be the Raduino link?

https://amateurradiokits.in/product/raduino-clone/

73

Ken VA3ABN

Re: uBITX SSB Audio #ubitx #calibration #ssb

Dean Souleles
 

Thanks Jim!

Where were you three weeks ago?  :)

My experience exactly.

Your straightforward post will really assist new builders,

Dean
KK4DAS

another stuck relay in TX mode #ubitx #bitx20

Don - KM4UDX
 

hello all!

My beloved V4 uBITX has been working really hard and flawlessly 24/7 in wspr mode for (almost) months at a time.  The results are impressive...frequently in the top 10 worldwide 2 way spot ranking.  But all that success comes at a price. 

Now, my uBITX randomly sticks in TX mode.  If I tap the left side relay, it releases TX mode.  I learned that diagnostic technique from Dave_ K0MBT (hahah, and thank you!).  If I just reboot or turn off/on, it stays in TX mode.  But the back of the pen allways works.  So am I good to go to replace the relay? I really hate to mess with it, but my hand is forced, as they say.

Is there a prefered type/source of replacement relay? 

thank you all!!!!

Don
km4udx

Re: Issues with ordering the BITX40

Ken
 

I know but I couldn't find the original Raduino on HFsignals


On Wed, Aug 14, 2019 at 5:29 PM JT Croteau <jt.tobit@...> wrote:
Ken, that is the Raduino clone by Sunil.

On Wed, Aug 14, 2019, 15:26 Ken <chase8043@...> wrote:
Could this be the Raduino link?

https://amateurradiokits.in/product/raduino-clone/

73

Ken VA3ABN

Re: Issues with ordering the BITX40

Ken
 


On Wed, Aug 14, 2019 at 5:29 PM JT Croteau <jt.tobit@...> wrote:
Ken, that is the Raduino clone by Sunil.

On Wed, Aug 14, 2019, 15:26 Ken <chase8043@...> wrote:
Could this be the Raduino link?

https://amateurradiokits.in/product/raduino-clone/

73

Ken VA3ABN

Re: uBITX SSB Audio #ubitx #calibration #ssb

Jim Willis
 

You are welcome! Just learning myself.

Best regards,
73,

Jim

On Aug 14, 2019, at 5:33 PM, Dean Souleles <dsouleles@...> wrote:

Thanks Jim!

Where were you three weeks ago?  :)

My experience exactly.

Your straightforward post will really assist new builders,

Dean
KK4DAS