Date   
Re: Tuning clicks on bitx40 #bitx40help

Jerry Gaffke
 

5v for 2.5ms on the vfo does sound like it might be that etherkit vco reset from last spring.
What firmware do you have installed now?

Re: UBITX Touch Control TFT Display

AA7GW
 

Nice

Sent from my iPhone
AA7GW

On Jan 26, 2018, at 3:23 PM, Brien Wankel <brien@...> wrote:

Looks great! Any interest in providing some sort of "how-to" and code for guys like me who want to do this as well?

- Brien K7XPO

On Fri, Jan 26, 2018 at 3:14 PM, Joe <joeman2116@...> wrote:
Finishing up the case for my UBITX
The display provides full touch control along with physical optional buttons.
100 memory channels
Tuneable Bfo
Vfo A B M
All bands selectable from front display
Uses cheap tft touch displays i use a 2.8
Low cost - Atmega 2560 for lots of pins and better perfomance.
Si5351 for dds

More to come.......

Coded by VU2SPF 
Tech support VE1BWV

73
Joe
VE1BWV

First phase nearly completed
<20180125_200543.jpg>


Re: uBITx.net website

AA7GW
 

Great idea and initial layout; I am very supportive of doing this, but realize the extent of the effort and wonder how some of us can help?

Sent from my iPhone
AA7GW

On Jan 26, 2018, at 4:59 PM, Arv Evans <arvid.evans@...> wrote:

David

This has been done to some limited extent through use of #hashtags within the group.
Others have set up #hashtags for specific topics within the group.
Problem with this is unless you actually log into https://groups.io/g/bitx20 you don't see
what #hashtags are already established.

You are correct about the wiki.  It needs very dedicated people to keep it up to date for
a fast moving group like this.

Arv 
_._


On Fri, Jan 26, 2018 at 4:46 PM, David Arthur <mumrah@...> wrote:
Here's my unsolicited 0.02 USD.

Rename the Groups.io group to "bitx" (this is possible through the settings i think), create subgroups for each radio in the bitx family (bitx20, bitx40, ubitx, etc), and perhaps another subgroup for the Raduino and programming issues. There will still be a "main" group which could be used for announcements or general discussion, but subgroups would allow for users to subscribe to what interests them.

The wiki could very easily become the official bitx knowledge base, but it needs some TLC to get to that point.



--
David K4DBZ
Unofficial bitx chatroom: https://discord.gg/CrHvWFc


Re: IRF510 amplifier failures

K9HZ <bill@...>
 

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! facebook icon

 

 

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: Caveat Emptor!

K9HZ <bill@...>
 

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.

Rent it: www.VillaGrandPiton.com

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: uBITx.net website

Ashhar Farhan
 

great initiative! i tried something similar a few years ago with the hfsignals.org as a wiki but it went nowhere. it is still ticking away. however a learning was that having multiple peeps to get the content and moderation in place works best.
i hardly moderate this group, it is the brainchild of hans, G0UPL and Arv is the boss. He has spent immense time and energy on nurturing this group. It is not s stretch to say we owe our existence to these two guys.
I hope ubitx.net finds and equally committed set of people to run it. 
Like the bitx20, the ubitx too will evolve into variants and more kitshops will pick it up. The structure of the website should handle this. With that easy advice, I am off to larc18. Last night 25 ubitx came alive. Today, another 24 to go!!
- f

On 27 Jan 2018 7:23 am, "AA7GW" <garywixom@q.com> wrote:
Great idea and initial layout; I am very supportive of doing this, but realize the extent of the effort and wonder how some of us can help?

Sent from my iPhone
AA7GW

On Jan 26, 2018, at 4:59 PM, Arv Evans <arvid.evans@...> wrote:

David

This has been done to some limited extent through use of #hashtags within the group.
Others have set up #hashtags for specific topics within the group.
Problem with this is unless you actually log into https://groups.io/g/bitx20 you don't see
what #hashtags are already established.

You are correct about the wiki.  It needs very dedicated people to keep it up to date for
a fast moving group like this.

Arv 
_._


On Fri, Jan 26, 2018 at 4:46 PM, David Arthur <mumrah@...> wrote:
Here's my unsolicited 0.02 USD.

Rename the Groups.io group to "bitx" (this is possible through the settings i think), create subgroups for each radio in the bitx family (bitx20, bitx40, ubitx, etc), and perhaps another subgroup for the Raduino and programming issues. There will still be a "main" group which could be used for announcements or general discussion, but subgroups would allow for users to subscribe to what interests them.

The wiki could very easily become the official bitx knowledge base, but it needs some TLC to get to that point.



--
David K4DBZ
Unofficial bitx chatroom: https://discord.gg/CrHvWFc


Re: IRF510 amplifier failures

James Lawrie
 

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 Touch Control TFT Display

Joe
 

Brein,

I use the following: HARDWARE

DISPLAY - Optimum size - 2.8inch TFT - I have tried several types and sizes from various companies - hit and miss. some work but poor clarity etc.

Having used the elegoo 2.8 inch  TFT Display with pen - from "amazon" has resulted in 100 percent working, clear, clean, crisp displays.
I have ordered 4 over time and quality is persistent. Price  around $15.00 shipped.  Best choice


Arduino Module : Atmega 2560 - Ebay is cheapest source at less then $10.00...  Any Atmega 2560 will work..
I have many different company modules and have found they all work great...

DDS module -  SI5351  module (not just the chip)- available from Ebay or Adafruit direct or amazon around $11.00


Female single jacks to solder to the rear of the Atmega....

I use this method to get access to the pins from the rear of the atmega 2560 as the front is facing the front radio panel with the display plugged directly into it.
There is no room to get access to the pins
I have done this on 3 rigs - bitx40 and 1 ubitx
This method minimizes the wires from atmega to the ubitx board.

.
You can also use an interface board which vu2spf has developed - he has the pics but no pcb for sale.

Jumpers - makes it nice a clean 
1 Jumper cable (2 pin) male to female for connection of sda and sdc from atmega to dds Si5351
1 Jumper female to female 8 pin from atmaga to ubitx board
3 cables for the clocks from Si5351 to the Ubitx.  - shielded cable is best

I feed the rig with 13.5 volts - well filtered non switching powersupply

I also use 2 buck voltage adjustable down converters (around $1.50 each ebay)

For 1- -- I  feed the 13.5 volt to it and adjust it down to 9v volts to feed the atmega 2560 - keeps it cooler than running full input voltage
I also add 2  filter caps -  one 2000 mfd caps on the input the other on the output along  with a 2- 10 ohm resistor on the ouput in series to act as a filter and hash filter isolation.


The second converter is used to feed the SI 5351 module - I adjust it to 5 volts - same filters as for the first   - keeps the unit isolated and cuts noise.


This results in a very quiet rig and everything nice and cool.

Not required but has not failed me in 3 bitx an 1 ubitx rigs... rigs always result in a quiet rig..

I will send pin diagram next go around

Code will be available in a few weeks - 




ABOVE - rear of the atmega - black plastic to hold atmega and cables and connectors added

2 buck down voltage converters - with blue leds


rear left of atmega with added single line female connectors top and side and bottom

NOTE:

You probably will want to install a pop click fix - Eliminates a loud pop / click whenever tx is turned on and off.

uses 1 1n4148 diode, a 470k resistor, a .22 cap and a 2n7000 mosfet......  Works amazing.....well.

This just mounts on the rear of the volume pot
 
above is view of mod - disregard the 104 cap.. this uses a bs170 but i use a 2n7000 - pin out is a little different
The pic above displays the raduino connection but works with the atmega t/r pin as well( red wire was raduino connection but i use the atmega 2560 t/r
pin 26 (ubitx)

my values are 470k and .22uf cap with a 2n7000 mosfet

This should get you going......

Joe
VE1BWV


On Fri, Jan 26, 2018 at 8:46 PM, AA7GW <garywixom@q.com> wrote:
Nice

Sent from my iPhone
AA7GW

On Jan 26, 2018, at 3:23 PM, Brien Wankel <brien@...> wrote:

Looks great! Any interest in providing some sort of "how-to" and code for guys like me who want to do this as well?

- Brien K7XPO

On Fri, Jan 26, 2018 at 3:14 PM, Joe <joeman2116@...> wrote:
Finishing up the case for my UBITX
The display provides full touch control along with physical optional buttons.
100 memory channels
Tuneable Bfo
Vfo A B M
All bands selectable from front display
Uses cheap tft touch displays i use a 2.8
Low cost - Atmega 2560 for lots of pins and better perfomance.
Si5351 for dds

More to come.......

Coded by VU2SPF 
Tech support VE1BWV

73
Joe
VE1BWV

First phase nearly completed
<20180125_200543.jpg>



Re: Caveat Emptor!

Jack, W8TEE
 

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: Caveat Emptor!

K9HZ <bill@...>
 

Sorry Jack… I’m down on J6 working the 160 contest and don’t have the capability to search the history at the moment.  My bad.

 

 

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! 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 11:20 PM
To: BITX20@groups.io
Subject: Re: [BITX20] Caveat Emptor!

 

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

 

CW and the TX Pop Problem

Dennis Zabawa
 

I am not a CW operator but am curious about how the uBITX handles the mode.  Does the TX Pop occurs when the transmitter is keyed for CW?  If not, what is the difference between CW and SSB operation with regard to the TX Pop?

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.