Date   
Re: CW Transmit Frequency VS Sidetone setting #radiuno #ubitx #ubitxcw #firmware

Daniel Conklin
 

In the CEC firmware manager there is a field to change the CWL, CWU displayed frequency, and there is also a field to change the side tone frequency.  You can also adjust the CW BFO separately from the SSB BFO.  I suspect all of those settings are interactive.  I haven't played with them much yet, but as I was reading your posts I wondered if you could set the side tone to -800 HZ.  I might try playing with all of the CW settings later this evening.
Dan, W2DLC

Re: Power of rf #ubitx #ubitx-help

Daniel Conklin
 

You might try checking out the thread related to this:  https://groups.io/g/BITX20/message/48158

Re: Firmware Questions

Doug W
 

I very, very, very strongly suggest you first build the radio and use it with the stock firmware.  The stock firmware is perfectly functional and should you run into any problems or issues with your radio you'll have one less variable to troubleshoot.
--
www.bitxmap.com

Re: Firmware Questions

Ralph Mowery
 

You should build the radio and see if it works first.  Then save the original configuration to a file.  This is so that if you start to do a calibration and something goes wrong you can start from the beginning again.  To use the new firmware with an s-meter you will have to install a hardware modification to make that work.  

You may or may not have to do a calibration on the radio as it is suppose to be calibrated at the 'factory'.  

Go here and read a lot about the ubitx.

Look at the kd8cec firmware.  It will have a couple of modifications that make the radio more convenient to use and info about an s-meter circuit and automatic volume control.



On Thu, May 24, 2018 at 12:14 PM, Curt M. <Kc3hjp@...> wrote:
Hi guys, getting ready to assemble my new uBitx. There’s a ton of information on the site but I’m afraid I may miss something if I don’t as a question or two. I take it that once I power the radio on I’m going to have to do some sort of calibration. I say this because I think I read where if you upgrade firmware some of the other firmwares my not have the ability to do this initial calibration. I was reading some stuff online while I was just about to goto sleep so maybe I misinterpreted what I read. 

So I guess my question is and I expect that it will be debatable but what seems to be the best firmware to use and what do I have to do with calibration? It would be nice to have something with a S meter and I’m not sure that I’ll use the radio on digital modes as far as I know. I have other radios for that.  I think the stock firmware does not have an S meter on the display. 

With my Bix40 I installed the front end protection diodes and a capacitor which I believe was to take care of some harmonics. After that I just used the radio. I stopped upgrading firmware after the release of firmware that was supposed to take care of the pop when keying up. I think the firmware after that was going to require some hardware mods and I didn’t see the benefit of doing that since I had a radio that operated very well. I see me using the uBitx and probably not modifying any further. 
_._,_


Re: RF power chain mods and improvements..

Jerry Gaffke
 

This post says the uBitx is using either the 45m15a (2 pole) or 45m15b (4 pole) for the 45mhz filter.
   https://groups.io/g/BITX20/message/33203
This post says it's the 2 pole 45m15a from WTL
  https://groups.io/g/BITX20/message/33260

I can't find a WTL data sheet, but here's one from Fox, their 45m15a is toward the bottom of page 2:
    https://www.mouser.com/ds/2/160/filters-15543.pdf
It's +/- 7khz on the 3dB bandwidth, +/- 28 khz for an 18 dB stopband
So we're going from roughly 3dB to 18 db while transitioning across 28-7.5=20.5 khz.
If that were linear (it's not), a 2khz chunk of that skirt would have a variance of (18dB-3dB)*2khz/20.5khz = 1.46dB
Might be less, if the attenuation we need is on a part of the skirt where it's changing a bit more slowly. 

My hearing is shot from chainsaws and tractors and such.  
But audio sounded about the same to me most anywhere on the skirt

I'll try to take some measurements later today.

Jerry



On Thu, May 24, 2018 at 07:55 am, Jerry Gaffke wrote:
I haven't measure the filter bandpass.
But just listening to it, it sounded ok to my ears, even when going way down the skirt.
And as I recall, I had to crank it over more than 2k khz before it seemed to be attenuating noticeably.
Busy now, but will take another look at that today.
Do you have a datasheet for the filter being used that you can point me to?

Jerry

Re: JackAl Board Debut

Richard E Neese
 

https://www.ebay.com/itm/STM32-Board-STM32F407ZGT6-4-3-Touchscreen-2-4GHz-RF-IR/172949104559?hash=item284491e7af:g:CP0AAOSw4nhZ8gzx

will this board work with your firmware ? I was thinking with all the pinouts I can do alot

Re: JackAl Board Debut

W2CTX
 

On May 24, 2018 at 1:02 PM Richard E Neese <kb3vgw@...> wrote:

https://www.ebay.com/itm/STM32-Board-STM32F407ZGT6-4-3-Touchscreen-2-4GHz-RF-IR/172949104559?hash=item284491e7af:g:CP0AAOSw4nhZ8gzx

will this board work with your firmware ? I was thinking with all the pinouts I can do alot

Re: 2 meter bitx possible?

n5ib_2
 

It would be tough.
One important factor is that in moving from HF to VHF, at least here in USA, the spectral purity requirements are ratcheted up by an order of magnitude - from 43 dB down from the fundamental when below 30 MHz, to 54 dB for VHF.

N5IB

uBITX - Digital mode power variation with input frequency #ubitx #ft8

Robbie Robertson
 

I'm new to uBITX, but used to operating digital modes (including FT8), but I'm not sure if what I'm seeing is a fault, or normal for the uBITX...
I'm using WSJT-X, and when I TX on the lower end of the 'spectrum' I get a much higher power output that the higher end (sorry I haven't got a power meter, but I can see the current being drawn from the power supply changing, and also the signal meter on my FT767 with no antenna attached).
This is strangely, the complete opposite I get when operating using the FT767 (i.e. high power at the higher end of the audio range).

Has anyone else experienced this,, or has a view on how to address it?

btw - I'm using a Easi Digi interface to feed PC headphone socket output into the mic socker connection (no mic attached).

Re: uBITX - Digital mode power variation with input frequency #ubitx #ft8

Ghericoan
 

This seems normal to me now that I hear someone else is also dealing with it. It doesn't matter which digital mode I use, the power drops off a bit once I move either side of 1200hz in the waterfall. That 1200hz mark is peak current draw at 1.3A dc input, once I move down to 500hz or up to 1500hz there is roughly 200-300ma current draw difference.

Move from 1200hz up to 1800hz and the difference is 350-425ma less draw. I would stab a guess that it has to do with the response of the SSB filter.


Also, side note, I found the WSJT-X drives the ubitx much harder than FLDigi for some odd reason.

On Thu, May 24, 2018, 1:57 PM Robbie Robertson <robbie.robertson@...> wrote:
I'm new to uBITX, but used to operating digital modes (including FT8), but I'm not sure if what I'm seeing is a fault, or normal for the uBITX...
I'm using WSJT-X, and when I TX on the lower end of the 'spectrum' I get a much higher power output that the higher end (sorry I haven't got a power meter, but I can see the current being drawn from the power supply changing, and also the signal meter on my FT767 with no antenna attached).
This is strangely, the complete opposite I get when operating using the FT767 (i.e. high power at the higher end of the audio range).

Has anyone else experienced this,, or has a view on how to address it?

btw - I'm using a Easi Digi interface to feed PC headphone socket output into the mic socker connection (no mic attached).


--
----------
N5WLF, Greggory (or my nickname, Ghericoan)
General Class, Digital Radio Hobbyist

Re: uBITX - Digital mode power variation with input frequency #ubitx #ft8

Bo Barry <bobarr@...>
 

Yep thats normal if the passband does not have a flat response. My Icom has a 3kHz passband and you can see the uneven signal pulses near the edges. Hang in the middle in a clear spot and you are OK. Check the fixed TX freq option. Use shift click to pick one out.
having a blast with mine on FT8. Bands are spotty, but I was at least heard in Germany with my 3 watts on 20 just now.
Bo W4GHV

Re: RF power chain mods and improvements..

Jerry Gaffke
 

There are other 45mhz filters out there that might be more suitable for this 45mhz attenuation trick.
This post suggests we are primarily concerned with the stopband 2mhz out:
    https://groups.io/g/BITX20/message/33203


On Thu, May 24, 2018 at 09:58 am, Jerry Gaffke wrote:
It's +/- 7khz on the 3dB bandwidth, +/- 28 khz for an 18 dB stopband
So we're going from roughly 3dB to 18 db while transitioning across 28-7.5=20.5 khz.
If that were linear (it's not), a 2khz chunk of that skirt would have a variance of (18dB-3dB)*2khz/20.5khz = 1.46dB

Re: RF power chain mods and improvements..

ajparent1/KB1GMX <kb1gmx@...>
 

How did this conversation end up here when there is another that is on topic
for attenuation via filter?

My self I'd not do it.  A DBM makes a fine attenuator just very the injection current.
Also the ND6T attenuator could  work in place of RV1.

Many ways to accomplish it but first we need to have enough gain to produce
the power.


Allison

Re: 2 meter bitx possible?

ajparent1/KB1GMX <kb1gmx@...>
 

the spectral purity issue is a red herring as you will need band pas filters anyway.

The real issue the entire transmit chain is unsuitable for 2M. Most of the parts
are marginal at 30mhz.  Also you will want a preamp ahead of the receiver
as is noise figure is fine for HF but poor for VHF weak signal work.

It would make a good low power radio as a transverter TRX.  Since most
commercial transverters only need a milliwattt or three the entire pre-driver,
driver and finals could be deleted. 

Allison

Re: Power of rf #ubitx #ubitx-help

ajparent1/KB1GMX <kb1gmx@...>
 

small increase adjust RV1.  That increases all so go for about 10-11W on 80m and
see what you get on 10M.  It should improve but 4-5W is maximum.

Allison

Re: JackAl Board Debut

Jack, W8TEE
 

I doubt it, or it would at least require some major work as our screens are 800x480 and use the RA8875 graphics controller. I slightly modified the Sumatoy touch screen library, so it you have one that works with that library, the odds improve somewhat.

Jack, W8TEE

On Thursday, May 24, 2018, 1:02:36 PM EDT, Richard E Neese <kb3vgw@...> wrote:


https://www.ebay.com/itm/STM32-Board-STM32F407ZGT6-4-3-Touchscreen-2-4GHz-RF-IR/172949104559?hash=item284491e7af:g:CP0AAOSw4nhZ8gzx

will this board work with your firmware ? I was thinking with all the pinouts I can do alot

Re: JackAl Board Debut

Jack, W8TEE
 

Gees! I just looked at the price!! That's almost twice the entire JackAl system!

Jack, W8TEE

On Thursday, May 24, 2018, 1:02:36 PM EDT, Richard E Neese <kb3vgw@...> wrote:


https://www.ebay.com/itm/STM32-Board-STM32F407ZGT6-4-3-Touchscreen-2-4GHz-RF-IR/172949104559?hash=item284491e7af:g:CP0AAOSw4nhZ8gzx

will this board work with your firmware ? I was thinking with all the pinouts I can do alot

Power problem !!! #ubitx #ubitx-help

حمد المزين <hamad.kalid@...>
 

Hello everyone i faced problem with power when I measure the power with swr meter i get less than 10 watt in low side band in ultra side band i get 6 watt on 20 meter but 10 meter i get 0.6 watt so it's normally if it's can I use the amplifier to amplify to 20 watt ? 

Was: RF power chain mods and improvements.. IS: 45MHz IF Attenuation

John (vk2eta)
 

Farhan,

The 45MHz filter slopes are much gentle than that at around 1dB, similar to Jerry's number. 

Here is the.plot of the response:

https://groups.io/g/BITX20/message/45675

73, John

JackAl board update

Jack, W8TEE
 

All:

We have finished the new set of Gerber files and will be sending those off today. Those new boards will be sent to our Beta testers for evaluation. We also know that there will be 13 pins brought out, of which 2 are analog pins. One pin is for Vbat, to supply power for the RTC if you use that feature. If you use the CW messaging feature, that requires 3 NO push button switches, which reduces the available pins to 9 with all features implemented. While we still have some software to add to the project, I still think you should have around 800K of flash and 200K of SRAM to use. While some people say they have over-clocked the controller, at 180MHz, we don't see the need. I don't see those parameters changing much. The 5" and 7" TFT displays are resistive touch and use the RA-8875 controller and the 4 wire SPI interface sold by BuyDisplay.com (ER-TFTM050-3 and ER-TFTM070-5). Most of the raw display management is on the graphics board. The connectors on JackAl are the 10 pin IDC type (e.g., eBay 282084089830). The board is based on the PJRC Teensy 3.8 and use the audio board from the same company. The final board size is 100x90mm. The common board parts are 1206 SMD's. All SMD parts (e.g., transistor, the Si5351, and other chips) are in place on the board. The connectors are not part of the board because we felt you may want to hang some "special stuff" on the rig.

Al and I still feel we are probably 2 months away from distribution.

Jack, W8TEE