Date   
Re: CW and the TX Pop Problem

Richie Chambless
 

My uBitx pops just as loud on both SSB and CW. I’m still trying to fix it. It’s really loud in my headphones.

Re: CW and the TX Pop Problem

KD8CGH
 

See this topic for some solutions https://groups.io/g/BITX20/message/38673

Re: #ubitx-help Strong Audio Tones in and outside audio receive passband #ubitx-help

John <passionfruit88@...>
 

Thank you again for the inputs you provided and thank you James for the de-soldering technique (I will need it).

Results of further investigations based on your inputs. Stock firmware loaded in Raduino. 

I checked also the 3.3V supply of the Arduino and found 3.62V. Stable even when changing menu items and tuning in frequency.

I placed an FT-817 in USB mode with it's rubber antenna near the Raduino (in place in the uBitx). Signals were around S8-S9.

1. Arduino 16Mhz crystal: Measured as oscillating on 15,995.27KHz. Tone would shift slightly and of a similar amount to the Rx audio when tuning the encoder and selecting menu items (see attached recording).

2. BFO was found on 11,996.70KHz which is consistent with the calibration value of 11,996.8KHz. No shift or noise present in the signal received.

3. First oscillator found at 52,090.72KHz for an Rx frequency of 7,100.00KHz. Again no shift or noise present in the signal received when changing the menu items. Change of Rx frequency by turning the encoder would result in a stepped but clean change in tone as received in the FT-817.

4. Second oscillator found at 32,993.95KHz as uBitx was in LSB mode. Clean, stable signal.

So the only clock that resembles the tuning noise but not the multiple tones of the Rx signal is the 16MHz Arduino clock.

I tried to wrap a ground connected shield around the Arduino (from the "top"), but did not find any difference in tones apart from a slight shift as when I place my finger near the Arduino's crystal.

So as proposed above I have ordered a new Arduino and will attempt its replacement on the Raduino.

Attached is the Rx of the 16Mhz Arduino clock.

Re: Caveat Emptor!

Arv Evans
 

Jack W8TEE

I did try the I2C scanner software but it did not find any responding addresses. 
Not sure what is going on with these 0.92 inch displays.  Maybe just a totally
defective batch of 5 units. 

Arv K7HKL
_._


On Fri, Jan 26, 2018 at 8:19 PM, Jack Purdum via Groups.Io <jjpurdum@...> wrote:
My post also pointed to an I2C scanner program by RobTillaart, as presented on the Arduino Forum. All I was trying to do was suggest a way for Arv or John to check their I2C address on the OLED's.

Jack, W8TEE



From: K9HZ <bill@...>
To: BITX20@groups.io
Sent: Friday, January 26, 2018 9:24 PM
Subject: Re: [BITX20] Caveat Emptor!

This was originally published by Jim Sheldon for figuring out the address of devices on the I2C.  A great help to me:
 
There is a little program out there called I2C Scanner that will run on the Nano and goes out looking for I2C addressee's on the bus
 
 
Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ
 
Owner - Operator
Big Signal Ranch – K9ZC
Staunton, Illinois
 
Owner – Operator
Villa Grand Piton – J68HZ
Soufriere, St. Lucia W.I.
Like us on Facebook! facebook icon
 
 
email:  bill@...
 
From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Jack Purdum via Groups.Io
Sent: Friday, January 26, 2018 6:24 PM
To: BITX20@groups.io
Subject: Re: [BITX20] Caveat Emptor!
 
I wasn't responding to John. The one I responded to, #40373, was on the same thread, and contained the quote that I posted. When I saw his post, I responded (#40375) . John jumped on me seven posts later (40382) because I mentioned the I2C issue, which are a problem for some OLED displays. Had he read back through the thread, he would have seen what I was responding to.
 
So, no, I'm not going to my room.
 
Jack, W8TEE
 

From: Vince Vielhaber <vev@...>
To: BITX20@groups.io
Sent: Friday, January 26, 2018 4:52 PM
Subject: Re: [BITX20] Caveat Emptor!
 
Now settle down or I'm sending you to your rooom without dinner!

John wasn't the one with the 0.92 displays.  Check your own post!

Vince.



On 01/26/2018 04:30 PM, Jack Purdum via Groups.Io wrote:
> "I have 5 of the small 0.92 inchdisplays but have not been able to get
> any of them to work. These are TWI or I2C interface
> and my Arduino does not recognize any."
>
> Before you get mouthy, check the initial post.
>
> Jack, W8TEE
>
>
> ------------------------------------------------------------------------
> *From:* John P <j.m.price@...>
> *To:* BITX20@groups.io
> *Sent:* Friday, January 26, 2018 4:00 PM
> *Subject:* Re: [BITX20] Caveat Emptor!
>
> On Fri, Jan 26, 2018 at 12:21 pm, Jack Purdum wrote:
>
>    Do you have the correct I2C address for the displays?
>
> They're not I2C displays; they're the 3.5: TFTs for the analyzed.
>
> --
> John - WA2FZW
>
>
>

--
  Michigan VHF Corp.  http://www.nobucks.net/   http://www.CDupe.com/
                          http://www.metalworkingfun.com


 
 
Virus-free. www.avast.com



Re: IRF510 amplifier failures

Lawrence Galea
 

Good morning.
I was thinking about the RD15HVF1 so that it would be easier for people who want to try 50MHz and perhaps 70MHs where available with suitable mods to the μbitx.

The RD16HHF1 appears to be  used in the Ukraine transverters as a PA in the 50MHz, 70MHz and 144 MHz transverters while the RD15HBF1 appears to be used in the 222MHz and 432MHz transverters. http://transverters-store.com/50mhz.htm

I have the 50MHz and 70MHz transverters and they do work.
Two years ago I worked more than 40 stations on 70MHz (see my log on QRZ dot com) with a simple dipole at about 4M high on the roof fed with some 50 feet of RG58 coax.
Last year I built a 5 element LFA Yagi for 70MHz but didn't have time to get on the air. 
Regards
Lawrence

On Sat, Jan 27, 2018 at 3:41 AM, James Lawrie <lawriejk@...> wrote:
Hello,

That’s why I bought 10 ea... for the uBitxs I’ll probably get the others rated at over 30 MHz. Always nice to stock up on useful parts. Out of all listed on there website what would you recommend for HF/VHF use?

James Lawrie

On Jan 26, 2018, at 19:56, K9HZ <bill@...> wrote:

The RD15HVF1 has a bit of a flatter input capacitance curve with frequency so its easier to keep constant gain over 1-54 MHz… but the RD16HHF1 is certainly a worthy part too.  Oh, did I mention, they are both real RF transistors?

 

 

Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ

 

Owner - Operator

Big Signal Ranch – K9ZC

Staunton, Illinois

 

Owner – Operator

Villa Grand Piton – J68HZ

Soufriere, St. Lucia W.I.

Rent it: www.VillaGrandPiton.com

Like us on Facebook! <image001.gif>

 

 

email:  bill@...

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of James Lawrie
Sent: Friday, January 26, 2018 2:01 PM
To: BITX20@groups.io
Subject: Re: [BITX20] IRF510 amplifier failures

 

On same site I found these, made for 30 MHz RD16HHF1. Sooo I bought 10 of them, plan to try in Bix40 first. Data sheet even shows a reference amp design, and they are 12 volt like the other one. If it works I’ll let everyone know.

 

James Lawrie


On Jan 26, 2018, at 11:32, Jerry Gaffke via Groups.Io <jgaffke@...> wrote:

The RD15HVF1's should be operated at not much more than 12v.
At 12v, the IRF510's would survive just fine with no antenna connected.
That's an infinite VSWR.

So not obvious that this is a solution to blown FET's.
Though I do think the the Ids curves go up more slowly as Vgs increases on the RD15HF1's,
which makes RV2,RV3 not so touchy.
And the RD15HF1's might be easier to drive at 30mhz.
If you do swap them in, let us know how much power you get at 30mhz.

Jerry, KE7ER

On Fri, Jan 26, 2018 at 03:54 am, KD8CGH wrote:

Wouldn't it be better to change to a RD15HVF1 for high VSWR


Re: uBITX woes, feeling disheartened. #ubitx

David Beal
 

Hi Jim, 
Thanks for the vacuum cleaner idea.

Instead of a piece of plastic hose, I borrowed one of my wife's wire/cardboard coat hangars like this:  http://static1.1.sqspcdn.com/static/f/549887/6555253/1271357721680/Coat+Hangers+02-Web.jpg  

using the thick cardboard tube as my sucker.  It worked very well and didn't burn. 
--
Dave Beal
AE6RQ

Re: uBITx.net website

Lawrence Galea
 

Thanks.
An excellent idea
Had a look.
Regards
Lawrence

On Fri, Jan 26, 2018 at 10:38 PM, Mike Woods <mhwoods@...> wrote:
I note that there were almost 3,000 messages on this email list in December and we are currently at 2364 messages in January (and we are not quite to the end of the month!).  If you are not following the traffic, or come to the party late, trying to extract helpful information from the list is not straight forward! That's not to say that the list and the files section aren't helpful.  They are fantastic in fact for emergent discussion!  But a mail group is not the best way for anybody to source tried and true information about anything.  A website is much better at summarising known facts, to prevent endless redesign of the wheel, and answering the same newbie question over and over again.

I figured I should do something about this, so check out http://ubitx.net

The website is at an early stage of development.  It will contain two types of information to begin with - a summary of some of the more interesting items that arise from list discussion, presented as "news" items and a comprehensive guide to constructing and modding.  

You can subscribe to the RSS feed to get news updates.

News items from the last 3 days include:
  • a "top board" for the uBitx (from Martin AE7EU)
  • removing the audio pop on T/R - a new approach (from Gary N3GO)
  • a new CW keying fix (from John AD0RW)
  • a discussion on IRF510 stabilisation fixes (from several list members).

I figured that these news items should reference the actual iogroups list items.  I will update some of the news stories that don't yet reference the original item. The news items have been summarised and/or edited lightly.

The other type of information on the website is intended to be a comprehensive guide to purchasing, assembling, fixing and modding the uBitx.   Static pages will summarise everything that a builder needs to know about a particular issue or extension.   Options for mods will be presented with recommendations for which ones are popular/proven.  Currently, I have begun pages covering the following (many of these have yet to be finished ...):

There's a lot more to be covered, just in the getting started section.  For example:
  • Reverse voltage and over-current protection
  • Microphone options
  • Wiring up an internal speaker, with an external phone jack
  • Wiring up a paddle and straight key
  • Getting support when things go wrong

I look forward to:

  • comments about the website's purpose, layout and example content
  • ways to improve and extend the website further
  • offers of assistance (directly to me at mhwoods@... please)

This will be a moderated website. I want to avoid the situation where  bum advice is shared with others that makes life a misery.

This is about short-cutting research time and eliminating blind alleys that detract from operating or modding time!

I'm off to a Ham Radio BBQ hosted by NZART Kapiti Branch (about 1/2 hour from me).   I look forward to reading the mail later today!  Brickbats, bouquets and all!

73

Mike  ZL1AXG



--
Mike Woods
mhwoods@...


Re: IRF510 amplifier failures

Henning Weddig
 

Yoiu can get this kit also on ebay, a short researcht fgave a big variety in price from about 5 euros including shipping up to 30 Euros!

So be carefull!!!

Henning Weddig

DK5LV


Am 26.01.2018 um 19:21 schrieb Thomas Sharka via Groups.Io:

 


On Friday, January 26, 2018 1:01 PM, James Lawrie <lawriejk@...> wrote:


On same site I found these, made for 30 MHz RD16HHF1. Sooo I bought 10 of them, plan to try in Bix40 first. Data sheet even shows a reference amp design, and they are 12 volt like the other one. If it works I’ll let everyone know.

James Lawrie

On Jan 26, 2018, at 11:32, Jerry Gaffke via Groups.Io <jgaffke@...> wrote:

The RD15HVF1's should be operated at not much more than 12v.
At 12v, the IRF510's would survive just fine with no antenna connected.
That's an infinite VSWR.

So not obvious that this is a solution to blown FET's.
Though I do think the the Ids curves go up more slowly as Vgs increases on the RD15HF1's,
which makes RV2,RV3 not so touchy.
And the RD15HF1's might be easier to drive at 30mhz.
If you do swap them in, let us know how much power you get at 30mhz.

Jerry, KE7ER

On Fri, Jan 26, 2018 at 03:54 am, KD8CGH wrote:
Wouldn't it be better to change to a RD15HVF1 for high VSWR



Re: End whistling into the mic

gw4akz@...
 

On Thu, Jan 25, 2018 at 01:20 pm, David wrote:
Instead of whistling into the mic when using an antenna tuner on SSB, we could easily add a tone generator and switch to do that for us. Thoughts?
I have fitted a switchable -6db pad between the output of the pcb and the anttena socket. With the circuit switched in the worst case swr is about 1.65 to 1 with an open or short circuit, this prevents the finals from ever seeing a poor swr. tune is easily achived with the key down and reduced radiated power when tunning up. I use 2 watt carbon resistors 33 ohms in a t attenuator circuit. 2 in parrarlel to give 16.5 ohms which is close enough to the callculated value. I use a relay to switch this attenuator in and out.

Re: uBITX woes, feeling disheartened. #ubitx

David Beal
 

Good evening, 

After I removed K3, I found that it had an open on the coil, but still with the new K3 still no joy. 

I'll follow Chris Herd's suggestion below as well as review the other threads here on a quest for hints. 

Thank you for your help. 

--
Dave Beal
AE6RQ

Re: uBITX woes, feeling disheartened. #ubitx

David Beal
 

also, for what it's worth - the original relay data sheet is here: http://www.megasan.com/service/pdfhandler.ashx?fileid=6579 
--
Dave Beal
AE6RQ

Re: No TX #ubitx

David Beal
 

Hi Joe, 
I'm experiencing similar symptoms as captured here: https://groups.io/g/BITX20/topic/7878333?p=Created,,,20,1,40,0 

Current draw indicates that it's making power, but nothing is making it to the antenna. FWIW, my initial bias current was 380 mA. 
 
I validated with a separate receiver that the radio is transmitting. I had concluded that K3 was bad; replaced it tonight (it did measure with open coils), but still no output.  

Tomorrow, I'll follow Ashhar's suggestions in this thread to check around the toroids and I'll run some DC checks on the relay paths. 

--
Dave Beal
AE6RQ

uBITX Firmware (CEC) 0.30 released (Test version). #ubitx

Ian Lee
 

I have not posted it on my blog separately since it is a test version. When the test is complete,  write a usage and post it.
I am writing for someone who is interested and test.  If I get an error report or a fix, I'll fix it and make it into github's 0.31 branch.

Here is a brief description of the change from 0.30.
improved CW Keying, Frequency Tune and CW performance according to users' requirements.
In particular, CW Keying applied ron's logic for use with original hardware. also made it possible to set the CW Key ADC range to reduce errors in CW.
ADC monitoring function is added to know the exact resistance and key contact status.
I thought that if you set your own ADC range using the measured values here, you would get an error. I need to test these things, so I leave this post.

removed all existing sources related to frequency tune. And i applied threshold, weight about speed, and steps. The problem of changing the frequency at the moment of catching the knob has probably disappeared. when the threshold has been exceeded, start frequency changing, i added some logic to prevent the thresholds from becoming unnatural.
If you want to fine-tune, slowly turn it and the threshold will be applied continuously and change very slowly.
The tune steps you can select now are 10, 20, 50, 100, 200, but you can change them in uBITX Manager 0.31 (now working)
You can change the step by pressing the function key for a long time. If you keep pressing it, Diallock will work.

The ham band movement applied at 0.28 was set to 0.30, so that region1 was set as the default.
Of course, you can change to the previous operation state by pressing the function key in the band select menu for a long time.
And like the 0.28 version, you can set up to 10 frequency bands in uBITX Manager to suit your country or your liking.

Please refer to below for the improvements and how to upload firmware and more detail.
The source and compiled firmware can be found in the release below link.
https://github.com/phdlee/ubitx

How to upload firmware and use version up to version 0.27
http://www.hamskey.com

--
Best 73
KD8CEC / Ph.D ian lee
kd8cec@...
www.hamskey.com (my blog)

Re: End whistling into the mic

chris gress <Chrisg0wfh@...>
 

You could always use this so you could have built in swr/rf out on your bitx the 51ohm resistors I use 2x 100 ohm 3watt I picked this up from the internet 

On 27 Jan 2018 09:32, "gw4akz via Groups.Io" <gw4akz=aol.com@groups.io> wrote:
On Thu, Jan 25, 2018 at 01:20 pm, David wrote:
Instead of whistling into the mic when using an antenna tuner on SSB, we could easily add a tone generator and switch to do that for us. Thoughts?
I have fitted a switchable -6db pad between the output of the pcb and the anttena socket. With the circuit switched in the worst case swr is about 1.65 to 1 with an open or short circuit, this prevents the finals from ever seeing a poor swr. tune is easily achived with the key down and reduced radiated power when tunning up. I use 2 watt carbon resistors 33 ohms in a t attenuator circuit. 2 in parrarlel to give 16.5 ohms which is close enough to the callculated value. I use a relay to switch this attenuator in and out.

Re: End whistling into the mic

chris gress <Chrisg0wfh@...>
 

Built on back of a switch low power atu to the right chris

On 27 Jan 2018 11:45, "chris gress" <Chrisg0wfh@...> wrote:
You could always use this so you could have built in swr/rf out on your bitx the 51ohm resistors I use 2x 100 ohm 3watt I picked this up from the internet 

On 27 Jan 2018 09:32, "gw4akz via Groups.Io" <gw4akz=aol.com@groups.io> wrote:
On Thu, Jan 25, 2018 at 01:20 pm, David wrote:
Instead of whistling into the mic when using an antenna tuner on SSB, we could easily add a tone generator and switch to do that for us. Thoughts?
I have fitted a switchable -6db pad between the output of the pcb and the anttena socket. With the circuit switched in the worst case swr is about 1.65 to 1 with an open or short circuit, this prevents the finals from ever seeing a poor swr. tune is easily achived with the key down and reduced radiated power when tunning up. I use 2 watt carbon resistors 33 ohms in a t attenuator circuit. 2 in parrarlel to give 16.5 ohms which is close enough to the callculated value. I use a relay to switch this attenuator in and out.

Re: Caveat Emptor!

John P
 

On Fri, Jan 26, 2018 at 11:47 am, John P wrote:
I just received 3 of the MCUFriend 3.5" TFT displays purchased from "accecity2006" on eBay. One of the 3 worked correctly; one was cracked and another one was not displaying text correctly.
I did get a refund quickly from the seller. That won't get my project up and running any faster though! Anyone have any recommendations on a reliable provider of the MCUFriend 3.5:" TFTs?
 
--
John - WA2FZW

Re: Second batch of uBITX shipping? #ubitx

Arvo W0VRA
 

Got a shipping confirmation last night for my December 15 order. Better start working on the case!

ubitx - pads under toroids

MAc B
 

There are nice 6 hole plastic pads under toroidal transformers.

Are they from the shop or custom made?

 

MAc

Re: Second batch of uBITX shipping? #ubitx

Laurence Oberman
 

If you paid with PayPal, PayPal will notify you when it ships.
Always better to pay the DHL extra as it's fully tracked.



On Jan 27, 2018 7:53 AM, "Arvo KD9HLC via Groups.Io" <arvopl=yahoo.com@groups.io> wrote:
Got a shipping confirmation last night for my December 15 order. Better start working on the case!

Re: Second batch of uBITX shipping? #ubitx

chris gress <Chrisg0wfh@...>
 

Mine is via India post I don't use dhl the take the pee with the extra charges had to pay £24 last time chris

On 27 Jan 2018 13:22, "Laurence Oberman" <oberman.l@...> wrote:
If you paid with PayPal, PayPal will notify you when it ships.
Always better to pay the DHL extra as it's fully tracked.



On Jan 27, 2018 7:53 AM, "Arvo KD9HLC via Groups.Io" <arvopl=yahoo.com@groups.io> wrote:
Got a shipping confirmation last night for my December 15 order. Better start working on the case!