Date   
Re: Volume pot question

Nikos SV1IYF
 

You should go way-way back, Clark, to find true log rotary potensiometers.
Vacuum tube era, when power amplification was voltage related.
They were also higher value units, typically 47 to 100 KOhms, as far as I remember.
Then came the transistor, a current amplification device.
Using a tube log pot in a transistor circuit was something equivalent to a rollercoaster ride in sound (I know first hand).
Succeded by low impedance linear pots, or dual slope linear ones for closer correlation of angular position to output sound level.
Linear (long) throw faders* was another story until VCAs where established.
(*) Penny & Giles faders were the most expencive part in a pro console.
73 Nikos

Re: The new uBITX boards are here

Doug W
 

How about a picture showing the new test points?

Still waiting for the deluxe CQ hall of famer collector's edition...
--
www.bitxmap.com

Re: Raduino CAD Files

W3JDR
 

Great!

I'll  be checking emails and such, so will stay in touch. 

Re: The new uBITX boards are here

Allen Merrell
 

This sounds very good, I should have waited a couple of weeks before I ordered mine now I will have to order  another one (was going to anyway). Hope to see new schematic  and pictures  soon.
--
Allen  Merrell

KD8CEC uBITX firmware 1.071 #ubitx

kj6etl
 

I am having trouble with the 1.8 firmware calibrating the unit. LSB and USB are reversed no matter what I do.

I have been told that the older 1.071 version did not have this problem and I very much would like to give that a try. However the download link on Github only had the 1.08 version available. There is a Google drive with the HEX file but that is not what I am looking for.

Does anyone have the software package for me ?-)

Thanks!

Rogier

Re: Apache Case on Sale

Tom, wb6b
 

I have one of those cases, bought is specifically with the uBITX in mind. The case is great value. A tight fit-- they have a larger version, also a good value.

I may use the non-waterproof "Aluminum" case 69316 because it might be possible to put the uBITX in the bottom half, and squeeze a Raspberry Pi and display in the top half. 

Tom, wb6b

Re: KD8CEC uBITX firmware 1.071 #ubitx

Tom, wb6b
 

Re: KD8CEC uBITX firmware 1.071 #ubitx

D. Daniel McGlothin KB3MUN
 

... the download link on Github only had the 1.08 version available.

If, at https://github.com/phdlee/ubitx , you click the "releases" link just above the red line above the green "clone or download" button, you get the prior releases.

This is a direct link: https://github.com/phdlee/ubitx/releases

Daniel KB3MUN

Re: The new uBITX boards are here

Skip Davis
 

Ron, C81 was changed to 470pf this is located on the base of Q90 the first driver stage.

Skip Davis, NC9O 

On May 26, 2018, at 18:43, w7hd.rh <w7hd.rh@...> wrote:

What capacitor was changed to what value?

Ron W7HD

On 05/26/2018 12:19 PM, Ashhar Farhan wrote:
Peeps, 

HF Signals has rolled out the new (r4) version of the PCBs. Here are the changes:

1. A new, low distortion audio amplifier made from discrete transistors. This is one is optimized for head-phones and connecting to PCs for digital modes. It does work with the small speakers as well. Builders with the earlier versions can try this audio amplifier as an outboard amplifier.
2. The audio thump issue during T/R switching has been fixed.
3. At 28 Mhz, the output is about 4 watts. (this involves a single capacitor change from the earlier PCB).
4. I have included some 'jump' points to add interesting stuff like CW filters to the board. There are a large number of test points to help you debug and understand the board. 

All in all, the changes are 'backward compatible' . That is, you can hack these changes to the previous boards to get in the new functionality. I have updated the circuit diargrams on www.hfsignals.com. The earlier board's circuit diagram has moved to http://www.hfsignals.com/index.php/ubitx-r3-archived/

The bad news is that we had to bump up the price of the board by 20 dollars. We fought long and hard to keep the price down. My personal ambition was to keep the price inside (or at) $100. This is price rise has to do with three things : The recent changes in the Indian import duty and sales tax; Our own increasing costs to preorder the parts. Lastly, we also increased our payout to those who wind the coils, assemble and test the boards. They were working at the same rate for the last two years. It was about time. 

The new boards cost $129 USD with shipping. $139 USB with DHL option. 

The good news is that from now on, these boards will be available on order. The waiting queue is gone.

On a personal note, I am happy with the new audio. It is so much sweeter and cleaner on the headphones.  Far less fatigue after hours of CW work. I am also using the FT8 extensively, I have bagged almost twenty countries, testing the new firmware.

- f

-- 
Ron W7HD - NAQCC#7587 OMISS#9898 KX3#6966 LinuxUser#415320
Editor OVARC newsletter

Re: BITX40 CW Carrier Mod - CW Waveform shaping ? #bitx40

Jerry Gaffke
 

During receive and during SSB transmit, the high side vfo (clk2) is at 45mhz plus the operating frequency.
On CW transmit, the VFO is moved to the operating frequency, and we can shut down clk0 and clk1 entirely if we wish.
If clk0 and clk1 remain active during CW transmit, we could be transmitting stuff from the mike at at 45mhz minus the operating frequency.
On the low bands that won't matter much, as the transmit LPF will take it out.
But if transmitting CW at 28mhz, we could have stuff from the mike going out on the air at 45-28 = 17 mhz if clk0 and ckl1 remain active.

Regarding key shaping, the keying envelope will be determined by the voltage at T2 pins 3 and 5.
The shape and max amplitude is determined by R104, C1, R105, C10, C22 plus the quiescent voltages at Q10-base
and Q22-emitter.  Not a trivial network.  I would start by messing with R104 and C1 for proper rise and fall times, 
add a resistor from R104-C1 node to ground if rise and fall times are not symmetrical enough.
Generally on QRP rigs key shaping is not to critical so long as it isn't just too abrupt, but something better
might be needed for those feeding this to a 100W amp.

Figure 6.114-E on page 6.63 of EMRFD shows a single transistor integrator that creates a nice trapezoidal
keying envelope.  A similar scheme using a PFET is used in the KD1JV MTR rigs, and many other such CW rigs.

Jerry, KE7ER


On Sat, May 26, 2018 at 06:43 am, Michael Babineau wrote:
I am curious if anyone has looked at the shape of the CW waveform generated by the BITX40 using the CW Carrier Mod associated with PE1NWLs Bitx40 sketch ?
CW-CARRIER wiring.png 

It seems to me that there might be room for some improvement by modifying this to provide some simple waveform shaping via an R/C network. 
According to what I have read the rise and fall times for the CW envelope should be something in the order of 5mS or greater for good sounding CW, free of clicks. 
The output from the Raduino via D6 through the 4K7 resistor is essentially a square wave. 

I had a friend record my BITX40 CW signal and send the wav file back to me and I don't actually hear anything that sounds like key clicks, but the keying does sound a 
bit hard. 

Using an online R/C time constant calculator, I calculated that adding approximately 1 uF of capacitance to ground in this circuit (assuming a 4k7 series resistor) would
give the desired 5mS rise time on the leading edge of the waveform, but I am not sure how to handle the trailing edge ? (I am software guy not an engineer).
Also would adding this additional capacitance to ground have any negative impact on the balanced modulator circuit ? 

 Any suggestions ? 

While pondering this I had another related thought.  While keying the BITX40 with the carrier mod the mic amplifier is still active. Does this imply that we should 
be unplugging our microphones while operating CW on the BITX40 to avoid picking up any stray noise ??? 

Cheers

Michael VE3WMB 

Re: Volume pot question

brad martin
 

Thanks guys. I’ll probably install it them after I get done painting and shielding the case. I was sure it was a log and went out and tested it and yep it sure was I think it came out to 500 ohm mid range or something. Definitely wasn’t 2.35k.

Brad

On Sat, May 26, 2018 at 6:49 PM Nikos SV1IYF <info.mauve@...> wrote:
You should go way-way back, Clark, to find true log rotary potensiometers.
Vacuum tube era, when power amplification was voltage related.
They were also higher value units, typically 47 to 100 KOhms, as far as I remember.
Then came the transistor, a current amplification device.
Using a tube log pot in a transistor circuit was something equivalent to a rollercoaster ride in sound (I know first hand).
Succeded by low impedance linear pots, or dual slope linear ones for closer correlation of angular position to output sound level.
Linear (long) throw faders* was another story until VCAs where established.
(*) Penny & Giles faders were the most expencive part in a pro console.
73 Nikos

Re: The new uBITX boards are here

 

It would be nice to see a comprehensive list of the changes for items 1 through 3, for those who might be interested in doing the mods to 
earlier revisions of the board.  

I have yet to wire my uBITX (from the initial shipment) up so it will tempting to make these mods once I have wired up the board as is to
make sure that it working ok.

Cheers

Michael VE3WMB 

Re: KD8CEC uBITX firmware 1.071 #ubitx

Zbigniew L
 

Apache case sale

Jack Purdum
 

The large case is also on sale...see printed catalog.

Jack, W8TEE

----- Forwarded Message -----

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Sent: Saturday, May 26, 2018, 10:22:07 PM EDT
Subject: Fw: DONT FORGET • Memorial Day - 4 Day Sale Going On Now



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Re: The new uBITX boards are here

w7hd.rh <w7hd.rh@...>
 

Perfect - thank you.  I will be using this rig mostly for Propnet PSK31 on 10M, so wanted about 4-5W output. 

On 05/26/2018 05:47 PM, Skip Davis via Groups.Io wrote:
Ron, C81 was changed to 470pf this is located on the base of Q90 the first driver stage.

Skip Davis, NC9O 


-- 
Ron W7HD - NAQCC#7587 OMISS#9898 KX3#6966 LinuxUser#415320
Editor OVARC newsletter

حمد المزين <hamad.kalid@...>
 

Hello everyone i want to amplify the output and i want to use the amplifier that will give me between 30-40w as output i found tge Mx-50pm which has good price and good reviews but people use this amplifier to yaesu 817 and for the KX3 so can i use and in addition my output is 5 watt approximately in 20m and 40m and 80m and the 10m it was 2 watt 

Re: BITX40 CW Carrier Mod - CW Waveform shaping ? #bitx40

Jerry Gaffke
 

I verified that the stock uBitx code does correctly shut down clk0 and clk1 during CW transmit.
Turning them back on takes awhile, as all the computations get redone and all pertinent si5351 registers loaded.
We could speed this up by several milliseconds by talking only to the si5351 clock enable register
Might be significant for some high speed CW operators.

// At start of CW transmission:
i2cWrite(3, 0xfb);   // clk2 on, clk1 and clk0 off   

// At end of CW transmission:
i2cWrite(3, 0xf8);   // clk2 and clk1 and clk0 on


You also must change clk2 to the operating freq and back.


Jerry


On Sat, May 26, 2018 at 06:02 pm, Jerry Gaffke wrote:
On CW transmit, the VFO is moved to the operating frequency, and we can shut down clk0 and clk1 entirely if we wish.
If clk0 and clk1 remain active during CW transmit, we could be transmitting stuff from the mike at at 45mhz minus the operating frequency.

New file uploaded to BITX20@groups.io

BITX20@groups.io Notification <BITX20+notification@...>
 

Hello,

This email message is a notification to let you know that a file has been uploaded to the Files area of the BITX20@groups.io group.

File: Raduino 4 line SS.zip

Uploaded By: Rahul Srivastava

Description:

You can access this file at the URL:
https://groups.io/g/BITX20/files/Raduino%204%20line%20display%20By%20VU3WJM%20Rahul/Raduino%204%20line%20SS.zip

Cheers,
The Groups.io Team

Raduino 4 Line Single Sided PCB boards

Rahul Srivastava
 

Hi! Friends,

I have designed a homebrew friendly Single sided PCB for Raduino in a form factor of 20X4 line LCD. This board  supports 2 line display as well. I have added some minor edits to orignal Raduino schematics that is self explanatory namely few more electrolytics, separate Analog Digital ground plain, Nano module on component side to make it plugable. Largely thru hole components but SMD pads also included for coupling and decoupling caps.

All fabrication files are being made Open Source for personal and club use only. Please verify the Gerbers before making the board. Your feedback is highly appreciated for any further improvements.

Enjoy & 73

Rahul VU3WJM

Re: Mx-50pm #ubitx-help #bitx20 #ubitx

Mike aka KC2WVB <rb5363@...>
 

I can't see why not. However perhaps a better choice is, from memory, the HF Packer. I had one but sold it when I moved. I am wishing I had not. Please Google the amp. I am sure you will be pleased by its attributes.


On Sat, May 26, 2018, 11:07 PM حمد المزين <hamad.kalid@...> wrote:
Hello everyone i want to amplify the output and i want to use the amplifier that will give me between 30-40w as output i found tge Mx-50pm which has good price and good reviews but people use this amplifier to yaesu 817 and for the KX3 so can i use and in addition my output is 5 watt approximately in 20m and 40m and 80m and the 10m it was 2 watt