Date   
Re: uBITX schema relay K1 #ubitx

Jerry Gaffke
 

Good idea to make use of K1-16 to disconnect Q90 during receive.
This would also protect Q90 from local QRO transmissions into a local antenna,
The similar Q13 on the Bitx40v3 is often blown in such situations, even when the rig is powered down.

Jerry, KE7ER


On Thu, Feb 1, 2018 at 03:08 am, pe0fko wrote:
On RX (and TX) the LP filter is also a connection to the TX power amp by C80, that will give a (very) small load on the antenna signal at RX and a mixer (Q90 diode BE) for strong received signals?

Need Some Insight On How uBITX Operates In CW Mode

Dennis Zabawa
 

Let me start this by stating that I an not a CW operator.  My interest in CW is to make a complete implementation of all uBITX capabilities in the Raduino clone that I am designing. 

As my design stands at this point, I am implementing most of the logic on an Arduino UNO with a custom made shield.  I am including a 3x4 matrix keypad to allow for direct frequency and other entry along with a rotary encoder with push button.  The keypad and encoder functions will be monitored by a RBBB (Really Bare Bones Board) UNO clone, from Modern Device and communicate with the UNO via the I2C bus.  The display is a 20x4 LCD, I2C bus, display board.  I am using a Kits and Parts, QRP SWR bridge, interfaced to the UNO via an I2C, 8 channel ADC board, to measure forward and reflected power during transmit and tuning.  I will be implementing an AF DSP on a Teensy board with control via an I2C link to the UNO.  The last module will be a keyer implemented on a Pro Micro and communicating with the UNO via an I2C link.

Regarding the CW operating characteristics of the uBITX, does it accomplish T/R switching fast enough for true QSK?  My understanding is that at 20 WPM, the switching needs to occur in 1 millisecond or less.  If the uBITX is not capable of this, I will probably just keep the receiver muted for about 10 milliseconds after a key up and forget about trying to implement QSK operation.

Re: Care and Feeding of SMD Parts

Jack Purdum
 

Good Lord! I can't even SEE 0402's!

Jack, W8TEE



From: Jerry Gaffke via Groups.Io <jgaffke@...>
To: BITX20@groups.io
Sent: Thursday, February 1, 2018 11:05 AM
Subject: Re: [BITX20] Care and Feeding of SMD Parts

Tim said:    I take a piece of printer paper and slit the corners so I can fold it into a tray.

I say:    http://www.origami-fun.com/support-files/origami-box-print.pdf
That way you don't have to dig around the workspace for 30 minutes to find the scotch tape.

When hand stuffing surface mount parts, working within a large baker's cake tin
can somewhat restrain all them flying 0402's and Sot23's.



On Thu, Feb 1, 2018 at 07:21 am, Tim Gorman wrote:
I take a piece of printer paper and slit the corners so I can fold it into a tray.


Re: Need Some Insight On How uBITX Operates In CW Mode

Jerry Gaffke
 

Not good enough for QSK.
And if it was, I would want some much better relays as they are going to be chattering like mad.

If you want fast QSK, you should check out the T/R scheme that Gary is working on:
    https://groups.io/g/BITX20/message/40953

Jerry, KE7ER


On Thu, Feb 1, 2018 at 08:26 am, Dennis Zabawa wrote:
Regarding the CW operating characteristics of the uBITX, does it accomplish T/R switching fast enough for true QSK? 

Re: [SPAM] Re: [BITX20] Replacing the PA section on Bitx 40

Lawrence Galea
 

Standing current in the G6ALU 20W amplifier with two D16HHF1 in push-pull is set to 250 mA each
Regards
Lawrence

On Thu, Feb 1, 2018 at 4:56 PM, M Garza <mgarza896@...> wrote:
From what I read, bias should be between 300 to 500ma.  Can anyone confirm this?
I like your socket idea, Raj.  Very good idea.  Makes experimenting easier.

Marco - KG5PRT 

On Feb 1, 2018 8:09 AM, "Raj vu2zap" <rajendrakumargg@...> wrote:
Transmits fine Bill!

I have not experimented with correct bias setting but I was running more than 100 mils bias..
That board got displaced by the new toy uBitx.. I'll be back to it later later.

At 01/02/2018, you wrote:
Also… have you had it on the air like that yet?
 
 
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 Raj vu2zap
Sent: Thursday, February 01, 2018 4:24 AM
To: BITX20@groups.io
Subject: [SPAM] Re: [BITX20] Replacing the PA section on Bitx 40
 
Here is how I made the socket and mounted the RDD16

Note the RDD is reversed and  then the gate is actually soldered to the IRF gate line which goes behind the FET.
Now I can use either of them..

You will need to think of a heat sink plate that fits this way!

Emacs!


Re: [SPAM] Re: [BITX20] Replacing the PA section on Bitx 40

M Garza <mgarza896@...>
 

Thanks!
I was looking at this schematic:
It showed different current levels for the bias.

Marco - KG5PRT

On Thu, Feb 1, 2018 at 10:43 AM, Lawrence Galea <9h1avlaw@...> wrote:
Standing current in the G6ALU 20W amplifier with two D16HHF1 in push-pull is set to 250 mA each
Regards
Lawrence

On Thu, Feb 1, 2018 at 4:56 PM, M Garza <mgarza896@...> wrote:
From what I read, bias should be between 300 to 500ma.  Can anyone confirm this?
I like your socket idea, Raj.  Very good idea.  Makes experimenting easier.

Marco - KG5PRT 

On Feb 1, 2018 8:09 AM, "Raj vu2zap" <rajendrakumargg@...> wrote:
Transmits fine Bill!

I have not experimented with correct bias setting but I was running more than 100 mils bias..
That board got displaced by the new toy uBitx.. I'll be back to it later later.

At 01/02/2018, you wrote:
Also… have you had it on the air like that yet?
 
 
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 Raj vu2zap
Sent: Thursday, February 01, 2018 4:24 AM
To: BITX20@groups.io
Subject: [SPAM] Re: [BITX20] Replacing the PA section on Bitx 40
 
Here is how I made the socket and mounted the RDD16

Note the RDD is reversed and  then the gate is actually soldered to the IRF gate line which goes behind the FET.
Now I can use either of them..

You will need to think of a heat sink plate that fits this way!

Emacs!



Re: Bitx40 USB mod

skreblins00@...
 

Thanks for the answer. The Allard's github page is very helpful.

Re: Crystal matching for ubitx

CoraDias@...
 

Hi...i am a new user here. As per my knowledge It is less important that the signal level than that they be frequency matched as closely as possible. It helps if they exhibit about the same activity, but it is secondary.

Re: Care and Feeding of SMD Parts

Michael Hagen
 

I am throwing away a bag of 0402s I have collected over the years.  I hate them!

I have 10s of thousands of SMDs.  I have shoe boxes full.  Some of the "Pill" boxes at the 99Cent stores work OK.

I take a 100 at a time out of the strips so I can grab them with tweezers out of pill boxes.  I label the top with a small avery label.

You can even get them for 5 or so pills a day and 7 days.  So 28 compartments in one small box.  Some pill boxes are so cheap, it is hard to open the flap lids.  So I have learned to buy just one for trial.

The deluxe way to go is the interlocking 1" boxes from the internet.  They lock together in any size pattern.  The lids are clear and have a spring.  You push the latch with your tweezers and the lip flips up.   Some vendors even send the whole selection of resistors out in them.   In about 1 ft Sq, you can get the whole range of 5% values.

73's

Mike, WA6ISP


On 2/1/2018 8:31 AM, Jack Purdum via Groups.Io wrote:
Good Lord! I can't even SEE 0402's!

Jack, W8TEE



From: Jerry Gaffke via Groups.Io <jgaffke@...>
To: BITX20@groups.io
Sent: Thursday, February 1, 2018 11:05 AM
Subject: Re: [BITX20] Care and Feeding of SMD Parts

Tim said:    I take a piece of printer paper and slit the corners so I can fold it into a tray.

I say:    http://www.origami-fun.com/support-files/origami-box-print.pdf
That way you don't have to dig around the workspace for 30 minutes to find the scotch tape.

When hand stuffing surface mount parts, working within a large baker's cake tin
can somewhat restrain all them flying 0402's and Sot23's.



On Thu, Feb 1, 2018 at 07:21 am, Tim Gorman wrote:
I take a piece of printer paper and slit the corners so I can fold it into a tray.



-- 
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID  "MotDog@..."
Mike@...

Re: Slack chat client

Joe Puma
 

Thanks just joined, I use slack for crypto currency mining support I’ve been doing. Great site. 

KD2NFC 






On Feb 1, 2018, at 7:10 AM, Richard E Neese <kb3vgw@...> wrote:

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

David S
 

Ian

 I'm a late comer to your party, amazing code functionality, takes the radio to another lever with the CAT, especially for digital.   No issues with uploading to the radio, I figured out how to use Xloader, a really simple way of getting the right code into the radio. 

I've also more or less got to grips with the uBitx manager and have a few comments, I entered my callsign and set it to display (permanently) on the previous manager software, the latest version has the alternate VFO frequency displayed in the callsign position and wipes it out.  I can't see any way of stopping either the 2nd VFO frequency or the Step from displaying, it could do with a settings flag. 

There's also an anomaly in the code step function, probably I didn't read about the it correctly.  It works as expected, a little fiddly getting the correct function press time, however  when I entered 500Hz, it's accepted by the manager, it saves and recovers from disc correctly but is implemented as 244Hz by the radio.

A quick question about the band frequencies, the maximum frequency I can enter is 99999 (Hz), sometimes a read from the radio gives a sensible frequency 554970912 (Hz) & mode 1.  Sorry I just can't figure this at all.

The other oddie is that I would expect to be ably to read a configuration file from disc both with or without the radio being connected.  I find that I have to read from the radio to allow a backup to be read from the disc.

I can see that you've got the bit well and truly between your teeth, are there any plans to add functionality for a 4 line or any other display.

Best regards & many thanks for the sharing the huge increase in functionality. 

David  G8DJM

Diy oscilloscope #parts

Christopher Miller
 

Pics of the oscilloscope kit I purchased. It seems a lot of people don't have them. 

Chris

Re: Care and Feeding of SMD Parts

Ken KM4NFQ
 

On Thu, Feb 1, 2018 at 11:31 AM, Jack Purdum via Groups.Io
<jjpurdum=yahoo.com@groups.io> wrote:
Good Lord! I can't even SEE 0402's!
You're probably referring to Metric 0402s?
There can be some confusion between Imperial and Metric dimensions.
An Imperial 0402 can be seen.
A Metric 0402 is the size of a mustard seed, or smaller.

https://en.wikipedia.org/wiki/Surface-mount_technology#Two-terminal_packages

An Imperial 0402 is the equivalent of a Metric 1005.

Regards,
Ken, KM4NFQ "Not Fully Qualified"

Re: Diy oscilloscope #parts

 

Just hope yours works. I built 2 of them both had bad parts. tossed them in the parts bin, now use a hand me down from a SK.
--
David

 N8DAH
Kit-Projects.com

Re: Diy oscilloscope #parts

Joe Puma
 

Do you have a link to this kit? I would love a scope but funds are short. 

Joe
KD2NFC 



On Feb 1, 2018, at 1:46 AM, Christopher Miller <djmalak2k6@...> wrote:

Pics of the oscilloscope kit I purchased. It seems a lot of people don't have them. 

Chris
<Screenshot_2018_01_31_21_36_32.png>
<Screenshot_2018_01_31_16_10_50.png>

Re: Diy oscilloscope #parts

 

Re: Audio gone on new ubitx

 

Here's a simplified schematic of the received audio signal path to guide you through the signal flow. Check Q70 for a signal output. M1 and M2 is a set of normally closed relay contacts on receive, on TX, contacts open.

Re: Care and Feeding of SMD Parts

Jack Purdum
 

Does matter...almost can't see either one! I'm pretty sure that Metric 0402 is a synonym for Higgs-Boson particle.

Jack, W8TEE



From: Ken KM4NFQ <km4nfq@...>
To: BITX20@groups.io
Sent: Thursday, February 1, 2018 12:51 PM
Subject: Re: [BITX20] Care and Feeding of SMD Parts

On Thu, Feb 1, 2018 at 11:31 AM, Jack Purdum via Groups.Io
<jjpurdum=yahoo.com@groups.io> wrote:
> Good Lord! I can't even SEE 0402's!
>

You're probably referring to Metric 0402s?
There can be some confusion between Imperial and Metric dimensions.
An Imperial 0402 can be seen.
A Metric 0402 is the size of a mustard seed, or smaller.

https://en.wikipedia.org/wiki/Surface-mount_technology#Two-terminal_packages

An Imperial 0402 is the equivalent of a Metric 1005.

Regards,
Ken, KM4NFQ "Not Fully Qualified"





Re: Diy oscilloscope #parts

Tom Clarke
 

Where did the case come from? Mine didn't include it.
Tom

KBRwyle | TRITON NATOPS/NATIP Product Support
22309 Exploration Drive | Lexington Park, MD 20653 | USA
Office: 301-863-4418 | Mobile: 301-904-2053
tom.clarke@... [Pri] | frederic.t.clarke.ctr@...
________________________________________
From: BITX20@groups.io [BITX20@groups.io] on behalf of Christopher Miller [djmalak2k6@...]
Sent: Thursday, February 1, 2018 1:46 AM
To: BITX20@groups.io
Subject: [BITX20] Diy oscilloscope #parts

Pics of the oscilloscope kit I purchased. It seems a lot of people don't have them.

Chris

Re: Diy oscilloscope #parts

 

If you google or ebay search you can find a few kinds with and without cases

--
David

 N8DAH
Kit-Projects.com