Date   
Re: Narrow filter for CW #ubitxcw

Jack, W8TEE
 

HI Tom:

Inexpensive DSP is incorporated into the JackAl board. This shot shows the "canned" SSB filters (1500, 1800, 2200, 3000), but the JackAl also provides "canned" CW filters, too (150, 300, 400 600Hz, and "Cust"):

Inline image


The "Cust" choice is for a filter where you get to set the "skirts" to whatever best suits your needs. Al (AC8GY) and I made the JackAl project Open Source, and  you can get the assembly manuals, code, and schematics from:



QRP Guys sell the JackAl board, which has all on-board SMD parts mounted.

Jack, W8TEE



On Tuesday, August 13, 2019, 3:00:12 AM EDT, Tom, wb6b <wb6b@...> wrote:


Hi,

Are there any comparisons that would indicate if a narrower bandwidth crystal filter verses an audio bandpass filter perform better? In some ways the audio filter is just another filter in the IF chain, and the current crystal filter becomes a second roofing filter.

Also, it would seem with DSP technology, filters, noise reduction and such would be possible in ways that were never possible with tried and true crystal filters and analog techniques. Have DSP audio processors delivered on these possibilities?

My old school HF transceiver has a narrow CW crystal filter and it seems to work well, but for my UBitx maybe something new school would be more practical.

In a field day situation if a high power station was near by in distance and frequency it could help. But if the radio was good enough to not overload, in that case, is it due to the crystal filter or simply the design of the receiver can handle a high dynamic range?

Are there any good articles or comparisons of one over the other? I'd been thinking of adding a audio bandpass filter to my UBitx, but sounds like it is not difficult to add a narrower crystal filter if done in "parallel" as suggested here. The difference in IF frequency seems like it would just be a software change, unlike radios of old. 

Tom, wb6b

Re: Narrow filter for CW #ubitxcw

Jack, W8TEE
 

On Tuesday, August 13, 2019, 8:32:49 AM EDT, Dennis Zabawa <kg4rul@...> wrote:


Here is another alternative for the audio side: Variable Audio Filter

Re: starting point

Skip Davis
 

Go with the original build and make sure everything functions, I mean does it RX and TX. Then if SSB sound off do a BFO calibration and if you feel that the frequency is off do that. Just work on one kink at a time. 
Then start your experimenting with other changes one at a time because you know that you had a working and functioning rig when you started. 
Don’t jump into a full blown calibration/modification at the beginning otherwise you won’t know where to start with troubleshooting. 

Skip Davis, NC9O

On Aug 13, 2019, at 04:57, dgclifford@... wrote:

hello  i have just ordered my ubitx and i am wondering where  to start ,should i go with the original stuff first or update  asap any ideas on a logical progression would be great .i have a couple of spare (gifts) raspberry pi 3b that are doing nothing what would be a good use for these . purchasing the ubitx was an spur of the moment i now would like to plan the way forward a bit more than i have.  many thanks dave c

Re: Narrow filter for CW #ubitxcw

KD8CGH
 

I'm using the tiny SOTABEAMS CW filter board. It is switched so that I can have it out for SSB and in for CW. It has two widths: 300 Hz and 1000 Hz. As a bonus it will also light an LED as a tuning indicator for those of us that are pretty tone deaf. Not bad for $30 + $5.79 shipping to USA.

https://www.sotabeams.co.uk/dual-bandwidth-filter-modules-ssb-cw/

Re: Narrow filter for CW #ubitxcw

Ashhar Farhan
 

The jackal board offers a very good choice of filters as well as many excellent features.
It provides a fantastic value at such a low price point.
- f

On Tue 13 Aug, 2019, 7:18 PM KD8CGH, <rkayakr@...> wrote:
I'm using the tiny SOTABEAMS CW filter board. It is switched so that I can have it out for SSB and in for CW. It has two widths: 300 Hz and 1000 Hz. As a bonus it will also light an LED as a tuning indicator for those of us that are pretty tone deaf. Not bad for $30 + $5.79 shipping to USA.

https://www.sotabeams.co.uk/dual-bandwidth-filter-modules-ssb-cw/

Re: Narrow filter for CW #ubitxcw

MadRadioModder
 

Yes I use my own coded version of this thing and it works very well as long as the IF is not over-loading…

 

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Dennis Zabawa
Sent: Tuesday, August 13, 2019 7:33 AM
To: BITX20@groups.io
Subject: Re: [BITX20] Narrow filter for CW #ubitxcw

 

Here is another alternative for the audio side: Variable Audio Filter


Virus-free. www.avg.com

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Re: Narrow filter for CW #ubitxcw

MadRadioModder
 

I even coded a small display to show the passband of my digital filter… it has two encoders… used identically like the Elecraft K3 filter… move either the upper and lower cut-off point, or press the button, and move the center frequency and filter width (LEDs indicate mode).  Four stored adjustable filters (CW, SSB, RTTY, AM).  Uses a Teensy 3.6 and the audio board (like the JackAl).  See attached.

 

 

 

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of MadRadioModder via Groups.Io
Sent: Tuesday, August 13, 2019 9:42 AM
To: BITX20@groups.io
Subject: Re: [BITX20] Narrow filter for CW #ubitxcw

 

Yes I use my own coded version of this thing and it works very well as long as the IF is not over-loading…

 

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Dennis Zabawa
Sent: Tuesday, August 13, 2019 7:33 AM
To: BITX20@groups.io
Subject: Re: [BITX20] Narrow filter for CW #ubitxcw

 

Here is another alternative for the audio side: Variable Audio Filter

 

Virus-free. www.avg.com


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Re: Issues with ordering the BITX40

Jerry Gaffke
 

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: CEC firmware V5

Herman Scheper
 

Many tnx.  It is working.  Now find out how Ubitx manager works and what i cando with it.  

Antuino support group opened

G1KQH
 

 
I have taken the bull by the horns and opened a support group for the Antuino..
 
 
 
Good Luck
 
73 Steve
 
G1KQH

uBITX SSB Audio #ubitx #calibration #ssb

Jim Willis
 

Symptom: SSB audio is unreadable. When tuning the VFO, SSB signals are heard "off-frequency" then the audio "goes away" as the frequency gets closer to the correct frequency.

Solution: Perform the BFO calibration procedure.

Outcome: Receiver audio sounds great!

73,

Jim KX4TD

Re: starting point

Don - KM4UDX
 

Dean and Skip speak wise truth. Do what they suggest, and your path will be fruitful.   

Every builder I know who rushed into adding the AGC board, or adding the spur reduction mod, or added a fancy external mic, or changed the relays, or or or had a MUCH harder time of it, and typically they give up in frustration, and uBITX never got happy on the air. 

So, build it as suggested in a pizza box, or plastic box, or anything that is easy. It is much more important to leave the physical rig exactly as designed, and then move on to loading the CEC software so you gain rig control for WSJTX or FLDGI, or HRD, or whatever software you use which controls the rig. 

So, in short,
1) build it as is, tweak BFO as needed,
2) load CEC software including memory manager
3) get your digital mode or logging application of choice to exercise uBITX rig control
4) use the radio (lots)
5) then, and only then, mod based on what needs YOU experienced in step 4 above.

Enjoy.

Don
km4udx.

Re: starting point

Evan Hand
 

I agree with Don, Dean and Skip.  I have built 2 version 4 and 1 version 5.  The first went smoothly because I did follow the steps in Don's message.  The second one I had issues with because I jumped into the mods before I had the rig working.  The last one I followed the formula and had no issues.

Start with the base, get it working, then start on the mod filled journey.

73
Evan
AC9TU

Re: Antuino support group opened -- early antuino question

Don - KM4UDX
 

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: starting point

dgclifford@...
 

On Tue, Aug 13, 2019 at 12:54 PM, Evan Hand wrote:
I agree with Don, Dean and Skip.  I have built 2 version 4 and 1 version 5.  The first went smoothly because I did follow the steps in Don's message.  The second one I had issues with because I jumped into the mods before I had the rig working.  The last one I followed the formula and had no issues.

Start with the base, get it working, then start on the mod filled journey.

73
Evan
AC9TU

Re: starting point

dgclifford@...
 

oops thanks for the input makes sense to me looking forward to it arriving  many thanks  dave c

Re: What is the current version board? I have been away from the forum for awhile

Rick Swearingen
 

How and where do you download the new version?

Re: What is the current version board? I have been away from the forum for awhile

Evan Hand
 

The version differences are driven by hardware changes.

Harmonics have been reduced by a different board layout for the low pass filters.

Spurs reduced through a 90mhz low pass filter addition between the if stages.  Best would be do download the information from HF Signals web site.

The other change is to the SSB fcrystal filter.  The center frequecncy was changed from 12 mhz to 11.055 mhz to reduce interference from so of the Nano clocks that are close to 12 mhz (the USB converter).

With out the hardware changes, the code would not work, and there is not significant changes in operation other than in the calibration procedure.  The new firmware goes into transmit mode to set calibration, so a dummy load or 10 mhz antenna is required.

Above are what I remember, and I may have missed some significant changes, especially to the firmware, as after I go my v5 board running, I quickly installed the kd8cec firmware and Nextion display.

All of the test that I have done so far indicate that the harmonics are solved with the changes.  I do no have a good enough spectrum analyzer to verify the spurs, though others have reported significant reductions.

73
Evan
AC9TU

Re: Antuino support group opened -- early antuino question

Ashhar Farhan
 

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

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: CEC firmware V5

Mark Hatch
 

Lots of magic in that Ubitx manager.... Enjoy!

Mark