Date   
Re: Bitx and uBitx video playlists #bitx40 #ubitx

Terry Morris
 

Thanks Peter. I have watched them. I subscribe to your channel and often visit your website to view updates or have another look at something I read orwatched.

Best 72 / 73 Terry KB8AMZ

Re: Spurs for Dummies? #ubitx-help

Tom, wb6b
 

Hi,

I've been enjoying all the conversations on improving the power chain. I'm learning a lot from all the technical issues, design parameters and practical issues that affect the performance of the transmitter.

As I'm mostly interested in digital modes on 80 through 17 meters, the power mods are not of burning importance to me. Yet, it still would be nice to transmit WSPR beacons on 15*,12 and 10 metes. I don't because I read about the transmitter spur issue related to the 45Mhz IF minus the transmit frequency.

Some of the issues seem to related to the possibility of people using the uBITX to drive high power amplifiers and the spur level exceeding an absolute limit rather than just the 40 some odd DB down spec.

For us folks who wan't stay with the QRP sprit of the uBITX would it be possible to change the 30Mhz output lowpass filter (K1 pins 14 and 3) to a bandpass filter? The uBITX is already fairly close to meeting the attenuation spec for the spur, so the additional attenuation needs are not great.

Or changing the wiring to leave the 30Mhz lowpass filter always in circuit and use relay K1 pins 14 and 3 to switch in a highness filter?

* The band that is most problematic seems to be 15 meters, so, sadly, that band may best be a receive only band unless another set of relays and filter were added for that one band.  Or, is it possible to extend the 18Mhz lowpass to cover 21Mhz? The tolerances, in this scenario, might be tight so an adjustable capacitor(s) in the filter might be needed to dial these in. 

For the most part I am very happy with the uBITx and when the dust settles I'll likely make some/all of the power chain improvements. 

Or, I may just wait for the uBITX Gen2 to come out and buy another one. These are great inexpensive transceivers, the old one will be a handy second radio to have that is still very good for most needs. 

Tom, wb6b
 

Re: UBITX Touch Control TFT Display

harleyleenuke
 

On Fri, Jan 26, 2018 at 02:14 pm, Joe wrote:
VE1BWV

Hello,
 I have installed the display and firmware and it mostly works great.  Except, I can not get the microphone to key the radio. I also cannot get my cw paddle to key the radio.
 I believe I have everything wired correctly, per the drawing.   
 Thanks for the great firmware and touch display. 
Thanks,
 Vern

Re: VU2SPF - TFT_TouchScreen_for_uBitx -- CAT, Split, UP/Down Scan, V2.9BU Released with New User Manual

harleyleenuke
 

Hello,,  i have installed this firmware on my uBitx and is is mostly working great.
 The only issue , is I can not get the CW key nor the microphone ,to Key the rig.
With the microphone plugged in, the PTT on the microphone does not key the rig. However, when I press the TX on the TFT display , the rig does key and the microphone works when I speak into it.     The cw paddle does nothing.

 I have wired the display up per the drawing,   Thanks for the help.

Vern
 

Re: Raduino_v1.27 will not compile

Tom, wb6b
 

Hi Gary,

No problem. I tend to take longer than average to compose my replies, so the same thing happens to me frequently; where someone has replied between when I started writing and hit the send button.

Your reply is good, as a second person elaborating on the subject makes those additional subjects clearer. I chose to limit to a couple of items as to not bring too many things into my reply all at once. 

Tom, wb6b

Re: VU2SPF - TFT_TouchScreen_for_uBitx -- CAT, Split, UP/Down Scan, V2.9BU Released with New User Manual

Joe
 

CW is not supported at this time.

The Ptt  is made of the Orange Wire and ground.  Your Ptt switch must provide a path to ground for the orange wire
 

Joe
ve1bwv


On Sun, Jun 10, 2018 at 11:50 PM harleyleenuke <vfrank59@...> wrote:
Hello,,  i have installed this firmware on my uBitx and is is mostly working great.
 The only issue , is I can not get the CW key nor the microphone ,to Key the rig.
With the microphone plugged in, the PTT on the microphone does not key the rig. However, when I press the TX on the TFT display , the rig does key and the microphone works when I speak into it.     The cw paddle does nothing.

 I have wired the display up per the drawing,   Thanks for the help.

Vern
 

Re: BITX QSO Afternoon/Evening, Sunday, June 10, 3PM & 7PM Local Time, 7277 kHz in North America, 7177 kHz elsewhere.

John P
 

Sorry I didn't make either session. I was having too much fun on the VHF contest now that I finally got the 6 meter beam up on the roof.  See y'all next week! 
--
John - WA2FZW

Re: Messed up removal of TDA2822

MVS Sarma
 

basically, one should cut the leads of old chip close to the chip body and not the board.
I generally do that way and use tweezer to hols each lead , and pull while soldering tool is heating the pad. Later I use solder sucker ( a piston type hand tool to clear the holes.

I do agree  too much heat would damage pads and insufficient heat never allows you suck the molten solder. We need to develop skill on other boards before handling the main patient.

all the best

Regards
MVS Sarma
 

On Mon, Jun 11, 2018 at 6:12 AM, Sajid Rahum via Groups.Io <zs735@...> wrote:
You can see the first one on the top left where the concern is on the first photo.


Net Neutrality Ending

Richard Spohn
 

Just a friendly reminder that the not-so-Friendly Candy Company is
repealing "net neutrality" today. Just another example in a long
string of events about making things worse, not better. Keep an eye
on your net-provider bills! -- Rich WB2GXM

Re: Messed up removal of TDA2822

 

Sajid,

Use a wick and remove the solder from the holes and mount a sock directly on the board. You can try with braid
from a shielded wire or a thing coax as a solder wick.

Raj

At 11-06-18, you wrote:
All:
Need help. I cut the TDA2822 (WX model) and tried my best to get the pins out - used copper wick etc. no luck.

Landed up wiring the 8 pin dil with replacement NJM chip. When i turned around, looks like one anchor dropped out - you can see the flux showing.

My worry where did that bit that dropped out was to go to? I will place a wire if needed.

This was been a nightmare replacing the 2822.

Any suggestion is welcome

Re: VU2SPF - TFT_TouchScreen_for_uBitx -- CAT, Split, UP/Down Scan, V2.9BU Released with New User Manual

harleyleenuke
 

Joe, Thanks for the help.  At least I am not crazy. 

Thanks ,
 Vern

Re: pcb for modifications ver3 to ver4

Terry Morris
 

For anyone clicking on Ashok's URL link above the gray horizontal line don't. Copy the link, enter it into the URL box of your browser, then be sure to remove the period between the letter "u" and the letter "b" before pressing <ENTER> key or clicking with your mouse. Else your browser will present you with an error message.​

Terry KB8AMZ

Re: Transmitter Mods

Tom Christian
 

Hahaha!  I'm amazed that anyone can work with 0201! Some day maybe in my dreams.....:). Thanks again!
Tom
AB7WT

Re: KD8CEC Firmware S-Meter usage

Mark M
 

I got some LM386 chips and built the circuit shown in Ians's article. It's a pretty simple circuit but I can't get it to work. No matter the input level, the output is a constant 4.16v, even with the input shorted or open. I don't understand what's going on. I've tried several different LM386s but no change. I'm completely baffled. So what is this diode-capacitor sensor that I keep reading about? I have the ND6T AGC board but haven't assembled it yet. If I can't get something as simple and idiot-proof as the LM386 circuit to work I'm not sure I should tackle anything more complicated. :)

Re: BITX QSO Afternoon/Evening, Sunday, June 10, 3PM & 7PM Local Time, 7277 kHz in North America, 7177 kHz elsewhere.

William Cullison
 

No BITX heard tonight. However, DX was fairly active on the band to include a couple of russians.

Re: Transmitter Mods

Jerry Gaffke
 

An 0201 is 20 thousands of an inch long, that's the space from pin to pin on the si5351.
The Si5351 is the small 10 pin surface mount part near the center of the front of the Raduino,
so generally hidden by the display.

0201's are great if you forget to include a 100 ohm terminator near a chip like that.
LVDS differential pairs generally come in on adjacent pins, so just solder the 0201 across the two pins.
You need a good binocular microscope and lots of light to see what you are doing.


On Sun, Jun 10, 2018 at 07:11 pm, Howard Fidel wrote:
Great news! I am 67 myself, but the 0805 parts are BIG, you should try your hand at 0201, that will drive you to drink really quick.

Re: Net Neutrality Ending

Ken Hansen
 

This is an international Maillist in support of an Amateur Radio device, please do not post political comments here. Such topics are typically not of interest to subscribers outside the US.

Thanks,

Ken, N2VIP

On Jun 10, 2018, at 10:37 PM, Richard Spohn <wb2gxm@...> wrote:

Just a friendly reminder that the not-so-Friendly Candy Company is
repealing "net neutrality" today. Just another example in a long
string of events about making things worse, not better. Keep an eye
on your net-provider bills! -- Rich WB2GXM


Re: 2.5 MHz low pass fiilter uses no toroids, SMDs #ubitx

John Sharpe
 

Dammit Peter!

Why couldn’t you have posted that a week ago!
I‘ve just finished building a Minikits 1.8Mhz high pass filter. http://www.minikits.com.au/HPF11-1M8 

It's a great filter but has six toroids and cost more than yours would!

The Minikits filter has made a dramatic difference to receive on my Bitx40.

Cheers, John

VK2VOL

On 11 Jun 2018, at 11:12 am, Peter Parker <vk3ye@...> wrote:

I've been experimenting with various types of low pass filters to cure BCI. 

My starting point was the VK3IL design. Then I changed the values to use prewound 2.2 uH RF chokes I had.  Increasing the capacitors by a similar factor (approx 1.5 times) dropped the cut-off frequency to around 2.5 MHz.  This may offer somewhat less attenuation of the broadcast band but does mean that the uBitx will tune WWV on 2.5 MHz without too much loss.  Also 160m reception should be possible on stronger signals.  The big benefit (for some) is there's no need to wind your own toroids.  And you can use conventional components on a small circuit board that can be sawn to make the pads.  

I'm pleased with its performance. More in this video. 

https://www.youtube.com/watch?v=fgQenFJOjr4

73, Peter VK3YE

 

Re: ardurino tutorials and books

Terry Morris
 

Vince,
I thank you for responding. Your comments about what I wrote are taken out of context (surprise, surprise). But the last one. What thread was that contained? Oh, the one about my comprehension of the magic of electrons in electrical circuits. Well that certainly pertains to this this, doesn't it.

Terry has left this room...

Re: 2.5 MHz low pass fiilter uses no toroids, SMDs #ubitx

Glenn
 

Thanks Peter,
I made one up using SMD parts on a bit of proto board.  Picture of the board and response attached. Yet to fit it, but looks great.

glenn
vk3pe



On Sun, Jun 10, 2018 at 06:12 pm, Peter Parker wrote:

I've been experimenting with various types of low pass filters to cure BCI. 

My starting point was the VK3IL design. Then I changed the values to use prewound 2.2 uH RF chokes I had.  Increasing the capacitors by a similar factor (approx 1.5 times) dropped the cut-off frequency to around 2.5 MHz.  This may offer somewhat less attenuation of the broadcast band but does mean that the uBitx will tune WWV on 2.5 MHz without too much loss.  Also 160m reception should be possible on stronger signals.  The big benefit (for some) is there's no need to wind your own toroids.  And you can use conventional components on a small circuit board that can be sawn to make the pads.  

I'm pleased with its performance. More in this video. 

https://www.youtube.com/watch?v=fgQenFJOjr4

73, Peter VK3YE