Date   
Re: FT8

Nigel G4ZAL
 

@Praba - I've built a couple of devices like this and never had any issues requiring isolation transformers (I have some but never fitted them as it worked fine as is).

@David - I used a USB cable "Mini USB 5pin male to female with screw panel mount extention cable" from ebay (mine was wired incorrectly as the colours were wrong according to the USB standard and had to wire according to how they had it set).  I cut this cable to suit and hard wired it to the USB hub (removed the original connection).
My USB hub was a Startech one, but basically any similar one that you can fit inside your enclosure should work.  I removed 2 of the USB sockets on the hub and hard wired my stripped down USB sound card of which I also removed the USB connector and 3.5mm audio/mic sockets and soldered it direct to the hub, plus added connector pins for the audio/mic (CD-ROM) cable.  I only went to these extremes so it would all fit inside my enclosure.  If your enclosure is big enough, you may be able to get away with simply plugging it all together.
The USB sound card can be found on the famous auction web site. Mine was an "External Virtual USB 3D Sound Audio Card Adaptor Converter Mic/Speaker PC Laptop"
I hard wired the Raduino USB side of the connector to the hub as well, but didn't connect the 5v power line (the Raduino is powered as normal).
To program the Raduino you have to have it powered up as normal.

I started out by proving it all worked by assembling all the component parts externally, using USB and audio/mic cables to suit.
The inspiration for the basics are here http://www.g4ilo.com/usblink.html - I just fancied it 'all-in-one' with CAT control.

I use KD8CEC's firmware http://www.hamskey.com/ and use the pre-built hex files and xloader so no need to compile yourself.
Ian's firmware allows CAT control emulation without necessarily needing any hardware mods.

I've worked all continents on my ubitx on FT8, so it does work ;-)

Not tried a pan adapter and probably won't 'hack' my ubitx any more (maybe!).

Nigel

KD8CEC 1.095 vs 1.097 Features and S-Meter #smeter #ubitx #ubitx-help

 

I have been using KD8CEC's 1.095 version of the Firmware and have been very happy with it. I am using a 3.7-inch Nextion display. My question is two-fold:
1) What extra benefits would I get for upgrading to 1.097? 
2) I need to add an S-Meter, what sensor and setups are best for either version?

Re: Apparent component swap in design and assembly of pc board v3 #ubitx-help

Axel - CE3AFC
 

Fine Ashhar, that was the idea.  Thanks to everybody else who gave some good and some not so good advice. J

 

 

De: BITX20@groups.io [mailto:BITX20@groups.io] En nombre de Ashhar Farhan
Enviado el: jueves, 08 de noviembre de 2018 15:00
Para: BITX20@groups.io
Asunto: Re: [BITX20] Apparent component swap in design and assembly of pc board v3 #ubitx-help

 

thanks for the spot. i will fix this along with other changes soon.

 

- f

 

On Wed, Nov 7, 2018 at 9:06 PM iz oos <and2oosiz2@...> wrote:

Mine is like yours, injecting a signal of around S3 was clearly audible anyway, that swap does not jeopardise anything.

 

Il 07/nov/2018 03:05, "Howard Fidel" <sonic1@...> ha scritto:

Really? R37 and C32 are in series, so the order makes no difference, although the schematic is drawn incorrectly. Fix your schematic.

On 11/6/2018 8:38 PM, ce3afc@... wrote:

According to the schematic v3, capacitor C32 should be connected on one side to pin 2 (emitter) of Q32 and resistor R36 and the other side to R37.  In my board both components are swapped and so are the silk screened references.  Is this a general PC board design and assembly mistake or just my board.  Correction can be made unsoldering both components and swapping them again.  Just the wrong silk screened references will remain.  Any advice will be appreciated.  Thank you!

 

 

Libre de virus. www.avg.com

 

Re: WSJT-X Split Operations #ft8 #ubitx

W2CTX
 

I believe CEC "split" has been incorrectly coded since day one.

rOn

On November 7, 2018 at 1:35 PM roger wincer <zedl2rx@...> wrote:


Bruce...I have had the same problem. So have disabled "split" on the WSJTX software and all is okay now. I have used the "split" facility before on another rig with no problem.
There appears to be a problem with the CEC software regarding all uses of "split" or "RIT". I have noticed when using "Split" VFOs in that, the receive VFO after the first transmission becomes the same value as the transmit VFO. This is also the case with RIT.
Has anyone else seen this? I have seen it with ver 1.08  and 1.1
Roger ZL2RX


Re: Tool advice: contemporary oscilloscopes and Spectrum Analyzers

KD8CGH
 

Thanks for the response Allison
I also had access to a spectrum analyzer, function generator and VNA at work along with an anechoic chamber and a calibrated very wide band log periodic antenna. I mentioned the Siglent because it was referenced in a previous post and I own one. I freely admit that I have much to learn about it's capabilities, but your comment on single frequency puzzled me. Shouldn't the FFT display signals with periods from the sampling time period down to ~10 x the sampling interval? Wouldn't that be functionally equivalent to a spectrum analyzer sweep between those corresponding frequencies?

     Bob

Re: uBITX AGC - Adafruit TPA2016, A Success! #ubitx

John Scherer
 

Wow, just found this thread.  I currently use the nd6t AGC and as playing around with controlling the hang-time digitally, but it takes 6 pins.  I just placed an order for the TPA2016 so I'll be playing with this for sure.  It would be really awesome if KD8CEC (or anyone) could add a config page for this to the Nextion display and support for it CEC firmware!  I'd take a stab at it but after looking at the graphics editor for the Nextion display, I'll pass.  It'd take me weeks to figure that hot mess out ;-)

John - N0CTL 

Re: uBITX AGC - Adafruit TPA2016, A Success! #ubitx

Joe Puma
 

I like the ND6T but I think Id rather have an audio agc. How would you wire this up? In a V3 board??

 

Joe

 

 

Sent from Mail for Windows 10

 

From: John Scherer
Sent: Thursday, November 8, 2018 2:23 PM
To: BITX20@groups.io
Subject: Re: [BITX20] uBITX AGC - Adafruit TPA2016, A Success! #ubitx

 

Wow, just found this thread.  I currently use the nd6t AGC and as playing around with controlling the hang-time digitally, but it takes 6 pins.  I just placed an order for the TPA2016 so I'll be playing with this for sure.  It would be really awesome if KD8CEC (or anyone) could add a config page for this to the Nextion display and support for it CEC firmware!  I'd take a stab at it but after looking at the graphics editor for the Nextion display, I'll pass.  It'd take me weeks to figure that hot mess out ;-)

John - N0CTL 

 

Re: Overpowering tone on Rx #ubitx-help

Timothy Fidler
 

Was it  in fact  use of a  switch mode power supply that caused this or is the problem on going ??

Re: Tool advice: contemporary oscilloscopes and Spectrum Analyzers

iz oos
 

Thank you all, your advices will be very useful to select the appropriate model. As for the possibility of a kit, if we are talking about assembling ready made boards I would be more than interested if it could be a reasonably priced yet valid alternative to the good models you mentioned.


Il 08/nov/2018 17:53, "ajparent1/KB1GMX" <kb1gmx@...> ha scritto:
One comment...

My work-a-day scope for lots of things is a B&K 20mhz dual trace analog.  For most tasks that
is a useful tool and for the 399$ paid back in the 90s its served well and continues to.  I also have
an old NLS 15 miniscope (15mhz, 1.5" screen, and battery portable!) that is very portable and 
useful for lots of tasks where a tiny scope will do.

I also have a 25mhz Tek 7402, Tek 485, and HP 4 channel 150mhz analog storage scope.
I use maybe one of them once a year more the tougher tasks (usually high speed digital stuff)
or when I really want the legendary Tek trigger for a stable display.  

For decades a cheap 20mhz analog scope was the standard for a large number of applications
and for many still will be.   Most 20Mhz analog scope can still see to greater than 30mhz
but signal timing is hard to measure there.  Used scopes like this can be often be had for
cheap.  hint Arduino clock is 16mhz, low if on uBitx is 12mhz and a 20mhz scope sees
them well and can see, if only poorly the 45mhz stuff too.

For the new digital scopes nothing less than 1gs/s will do for more than audio.. Why?
You need at least 10-20 samples or the wave shape is distorted to non recognition.
So your talking maybe 50mhz max.  So sample rate impacts time resolution and
signal (waveshape) accuracy.

Allison

Allison

Re: Transmit Problem

William R Maxwell
 

0.1 = 100uF, 100 probably = 100V

Bill VK7MX

Re: DIGITAL FREQUENCY READOUT

Vince Vielhaber
 

Did you check the 25MHz calibration of the si5351? If that's off, everything will be.

Also, what is the box above your uBitx (the one with the display that has PWR:0 SWR: 0.00 and RF: 0.0)?

Vince.

On 11/08/2018 11:22 AM, MONEYSMITH wrote:
THIS IS WHAT I SEE WHEN LISTENING TO 7.128

WILLIAM W4NFR



-------- Forwarded Message --------
Subject: Re: [BITX20] DIGITAL FREQUENCY READOUT
Date: Thu, 8 Nov 2018 08:19:45 -0800
From: MONEYSMITH <w4nfr@...>
To: BITX20@groups.io



THANK YOU FOR THE COMMENTS. I HAVE LEARNED TO LIVE WITH IT. I HAVE TEST
THE OFFSET WITH KNOWN STATIONS

THAT ARE ON FREQUENCY AND MY DISPLAY IS ALWAYS 1 KHZ LOW FROM THE
ACTUAL. I SUPPOSE THE 1 KHZ OFFSET WORKS

FOR CW AND SSB AND MAY BE THE REASON FOR THE STRANGE THING.


On 11/8/2018 6:46 AM, Mark Pilant wrote:
Hi William.

MAYBE I AM MISSING SOMETHING, BUT ARE ALL uBITX V4.3 RADIOS HAVE A ONE
KHZ LOW READOUT. FOR EXAMPLE, IF I HAVE A STATION ON 7.150 SELECTED,
IT READS OUT 7.149 FOR CLEAR RECEPTION. IS THIS NORMAL?
The short answer, maybe. (I apologize if you already know the following;
but for those who do not...)

Digital frequency readout is only as accurate as the calibration of
the sending
and receiving stations. (I had a recent thread going about the Si5351
calibration.) I'm assuming you have done the recommended calibration
of your
uBitx.

Even with a calibrated uBitx, there is likely to be some drift due to
thermal
heating from any number of sources: the components themselves, ambient air
temperature, etc. This being said, it is probably unlikely you would see
a 1 KHz drift.

The other possibility is the sending station is "off", they may say
they are
transmitting on 7.150 MHz, but in reality they are on 7.149 MHz. Without
knowing the calibration of the sending station, it is really impossible to
know for certain.

In the "good ol' days" of analog dials, you simply tuned for the best
reception
and went with that. (This is one of the reasons, back then, operating
near
the band edges was not recommended :-) I do it all the time with my
Collins
rigs: get close with the dial and then interpolate the frequency.

My suggestion, if you are confident of your uBitx's calibration, is not to
worry about it and enjoy the contact :-)

73

- Mark N1VQW




<http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient>
Virus-free. www.avg.com
<http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient>


<#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>

Re: Tool advice: contemporary oscilloscopes and Spectrum Analyzers

Evan Hand
 

Has anyone with more experience looked at the Seeed Studio RF Explorer series of Spectrum Analyzers?  I have one and on the surface looks like it does the job, especially when connected to a PC.  I did use it to verify that there are marginal issues with harmonics on the uBitx, not quite the -43 db required (more like -41 to -42 on my board).

It is low cost ($178) for the WSUB1G+ on Amazon. And it can be portable.


Tool advice: contemporary oscilloscopes and Spectrum Analyzers

MadRadioModder
 

In my RF labs, every bench has… at the minimum (entry level) a Rigol DS1054 4ch 50MHz scope, a Rigol DSA815 1.5 GHz SpecAn with tracking generator, and a Rigol DG1022U 2ch Arbitrary Waveform Generator.  This equipment is dirt cheap for what it is capable of compared to the HP/ Tek/ Wavecrest/Agilent like instruments of the past.  There are other brands out there who compete at the same price point as Rigol that are just as good. There is a little secret that you must know… around Dayton they all have competitive sales (and “Show Specials”).  Two years in a row I have returned from Dayton with a car full of new test gear because the prices were so low (The first DS1054 I bought was $289 new).


--

…_. _._

Re: DIGITAL FREQUENCY READOUT

N5KBP
 

You need to calibrate the VFO.

--
N5KBP

Re: Tool advice: contemporary oscilloscopes and Spectrum Analyzers

Benton Holzwarth
 

Hi, Benton here, speaking from a 35+ Tek career completed earlier this year...   I spent my entire time there writing SW for mid-range o'scopes, starting with the 2465 and ending with the '5 Series' MSOs.

> Siglent, Rigol, Hantek, are good places to start for low-cost new gear.
>But you don't necessarily want to buy from the lowest bidder,

There was a story, repeated by a couple folks in one of the other AR mail lists, that Tek OEM'd some of our low-end scopes from Rigol.  They were apparently told this by a rep at one of the trade shows.  (I don't know if it was a manufacturer's rep or one of the distributors.)  I thought this was untrue and confirmed it with one of our guys that would know for certain.  If anyone repeats this story to you, they've either bought in on the lie or are trying to deceive you.

> I'm not aware of any other scope for which a firmware upgrade removes a marketing gimmick like that,
some people seem to assume it's true of all the new DSO's.

This, on the other hand, is true -- many of Tek's mid-range o'scopes can increase BW at least through some steps via the application of a license key.  It might be either a fob or application of an encrypted string or signed file.  (Some models do require a board-swap to attain the top BW level.)

Back in the day, for one of our scope lines that did actually implement BW differences with HW changes (I think it was the 2220/2230 pair) the lower BW model was actually *more* expensive to build.  It included a couple extra caps on each channel to roll off the BW early.  8*)

Benton 8nov18
--
NX7O
benton@...

Re: Tool advice: contemporary oscilloscopes and Spectrum Analyzers

Jerry Gaffke
 

I spent a decade sitting in front of a 2465.
A very nice scope, you did some good work!

Jerry, KE7ER



On Thu, Nov 8, 2018 at 02:38 PM, Benton Holzwarth wrote:
Hi, Benton here, speaking from a 35+ Tek career completed earlier this year...   I spent my entire time there writing SW for mid-range o'scopes, starting with the 2465 and ending with the '5 Series' MSOs.

Re: Transmit Problem

Evan Hand
 

I am pretty sure the .1 is .1uf =100nf. I agree with the 100 volt

Re: Harmonics and Relay Replacement

Kees T
 

Ben, NO5K, also ran some LPF Transmission Charts on a "pristine" V3.0 board followed by ONLY changing the the relays to AXICOM relays .....same fixture setup, same cables, same test gear. The plots show somewhat better harmonics reduction with the AXICOM relays but the rolloff (a filter characteristic) is basically the same between the two as you would expect them to be. 

As I mentioned earlier the AXICOM relays DO show improvement but it's not the whole story.

The attached charts are small, but can be expanded. The goal is to get the general idea.  

73 Kees K5BCQ


STANDARD uBITX RELAYS


AXICOM RELAYS

Re: DIGITAL FREQUENCY READOUT

MONEYSMITH
 

THE BOX ABOVE THE uBITX IS MY HB DIGITAL WATT METER AND SWR BRIDGE. THANKS FOR THE REPLY.

W4NFR

On 11/8/2018 1:41 PM, Vince Vielhaber wrote:
Did you check the 25MHz calibration of the si5351?  If that's off, everything will be.

Also, what is the box above your uBitx (the one with the display that has PWR:0 SWR: 0.00 and RF: 0.0)?

Vince.


On 11/08/2018 11:22 AM, MONEYSMITH wrote:
THIS IS WHAT  I SEE WHEN LISTENING TO 7.128

WILLIAM W4NFR



-------- Forwarded Message --------
Subject:     Re: [BITX20] DIGITAL FREQUENCY READOUT
Date:     Thu, 8 Nov 2018 08:19:45 -0800
From:     MONEYSMITH <w4nfr@...>
To:     BITX20@groups.io



THANK YOU FOR THE COMMENTS. I HAVE LEARNED TO LIVE WITH IT. I HAVE TEST
THE OFFSET WITH KNOWN STATIONS

THAT ARE ON FREQUENCY AND MY DISPLAY IS ALWAYS 1 KHZ LOW FROM THE
ACTUAL.  I SUPPOSE THE 1 KHZ OFFSET WORKS

FOR CW AND SSB AND MAY BE THE REASON FOR THE STRANGE THING.


On 11/8/2018 6:46 AM, Mark Pilant wrote:
Hi William.

MAYBE I AM MISSING SOMETHING, BUT ARE ALL uBITX V4.3 RADIOS HAVE A
ONE
KHZ LOW READOUT. FOR EXAMPLE, IF I HAVE A STATION ON 7.150 SELECTED,
IT READS OUT 7.149 FOR CLEAR RECEPTION. IS THIS NORMAL?
The short answer, maybe.  (I apologize if you already know the following;
but for those who do not...)

Digital frequency readout is only as accurate as the calibration of
the sending
and receiving stations.  (I had a recent thread going about the Si5351
calibration.)  I'm assuming you have done the recommended calibration
of your
uBitx.

Even with a calibrated uBitx, there is likely to be some drift due to
thermal
heating from any number of sources: the components themselves, ambient air
temperature, etc.  This being said, it is probably unlikely you would see
a 1 KHz drift.

The other possibility is the sending station is "off", they may say
they are
transmitting on 7.150 MHz, but in reality they are on 7.149 MHz. Without
knowing the calibration of the sending station, it is really impossible to
know for certain.

In the "good ol' days" of analog dials, you simply tuned for the best
reception
and went with that.  (This is one of the reasons, back then, operating
near
the band edges was not recommended :-)  I do it all the time with my
Collins
rigs: get close with the dial and then interpolate the frequency.

My suggestion, if you are confident of your uBitx's calibration, is not to
worry about it and enjoy the contact :-)

73

- Mark  N1VQW




<http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient>
    Virus-free. www.avg.com
<http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient>


<#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>
---
This email has been checked for viruses by AVG.
https://www.avg.com

Re: DIGITAL FREQUENCY READOUT

RCC WB5YYM
 

Being 1khz off is not "normal". It needs master calibration adjusted,  NOT BFO CALIBRATION. Mine is hardly ever 10 cycles off.