Re: Adding /modifying firmware. #firmware


Hi Mike, 
I looked up ver 1.1  memory manager and found the place to enter the call letters .  I noticed his new version does not have all the spaces on the left that the old one had.
I couldn't seem to find any instructions other than Dr. Lees on the old version (which I didnt understand)
A couple of questions
1) Baud rate?  What is it.  Then connect
2) Enter KM4TRT across from "my callsign" and chk the box  Do I have to enter anything in the text box above?
3) Then "write to bitx"  and done?

Andy  KM4TRT

uBitx FT8 problem


Hello,one question about working on digimodes FT8 with uBitx... after transmiting , the frequency drops downthrough 1kH on uBitx display.for example: then frequencie is 14.074mhz after transmit drops down to 14.073mhz. After second transmit drops down to 14.072mhz and so on... Im working with WSJT-X. How to solve the problem? Thanks.

Re: uBitx FT8 problem

Doug W

How are you controlling your frequency on the radio?

Re: uBitx FT8 problem


Controlling with CAT cable. WSJT-X program controll automaticly,then you set 20m band program set frequency 14,074mhz on the radio...

Re: uBitx FT8 problem

Doug W

I am not using CAT control so I can only guess but if that is the only time you see this behavior I would start by looking at how well shielded your usb cable is (or is not).

Re: Low Pass filter inductor question. #filters


I've built the lpf for 40 and realize there is plenty of room for putting the 20 meter filter on the same board.  I thought I'd manually switch them.  So does this switching work?  What I mean is, should both legs be switched,  will I get any weirdness from the shared ground?   Sorry for the poor diagram.

Re: uBitx FT8 problem

John P

Do you have split mode enabled in WSJT and not in the radio? In split mode, WSJT plays with the transmitter frequency and the audio tone frequency to keep it in the middle of the bandpass. It sounds like the frequency is being changed but not getting changed back after transmitting
John - WA2FZW

TSW's just released 5" Color TFT Touch/KB/Mouse screen for uBITX #ubitx

Jim Sheldon

The picture is that of W0EB's uBITX rig built with a 5" RA8875 type Color TFT display running on our BITeensio Card.  The system shown can be controlled by touching the screen, with an external USB Keyboard or an external USB mouse.  This almost completely eliminates the need for front panel controls and helps make a very clean looking uBITX build while keeping full functionality.

Regarding the use of 5" and larger displays, there are several MAJOR problems we encountered. The 5" display draws almost half an amp from the 3.3V rail and the even larger 7" displays that many people are clamoring for, draw even more current. Even using the 5" display requires the BITeensio card to be modified extensively to provide a high current, on-board 3.3 volt regulator as the Teensy 3.6's on-board regulator would be severely strained trying to power this display.

In doing this we build the new 3.3V 1.5amp  regulator by isolating and using the pads for the 5 volt I2C bus on the card.  We do lose 5 volt I2C capability by doing this but the 3.3V I2C bus is still available so 3.3V I2C peripherals can still be used.

Another disadvantage of the larger displays other than their higher cost and high current requirement, is that a fan to cool the regulator's heat sink is now almost an absolute necessity instead of an option. This makes retrofitting the bigger displays very difficult to say the least.

Due to their high cost and extreme current requirements, we have no plans to support any color displays larger than the 5" one and the 5" only for experienced experimenters because of the mods that need to be done on the BITeensio card to supply the higher current 3.3V necessary.

We're also recommending that using the 5" display be considered ONLY with a new BITeensio build rather than modifying a previously constructed one as there is much less chance of messing it up this way. The modification instruction manual, with pictures is located in the "Documentation" directory of this website's "Files" section. This one like the previous 2.8" Color version and our older 4 Line I2C LCD display versions are capable of utilizing the optional external USB keyboard for rig control and CW. Mouse control is only available with the Color TFT versions.

For rig control (only with the color displays) our just released software will now allow use of a mouse for everything but the keyboard CW keyer and the same thing applies as with the 2.8" display. Purchasing an inexpensive, wireless keyboard/mouse combination such as the one from Logitech will allow simultaneous keyboard and mouse operation. Using the keyboard or mouse for control, you won't have to even touch the screen unless you want to. This will reduce wear and tear on the touch panel.

All documentation for modifying the BITeensio card and the just released firmware for the 5" display version ( is available on the TSW website ( in the files directory.  The 5" display we use is the "ER-TFTM050-3 from Buy Display dot com.  If you decide to order one you need to get it with the 4 wire SPI interface, Resistive Touch Screen, 3.3V power option (5 V won't work) and the ER3304-1 font chip.  The SD card option is not  necessary  as all SD card  operation is contained  on the Teensy 3.6 itself.

Ordering information for the BITeensio kits is also available on the website and kits are in stock.

Jim Sheldon, W0EB
TSW Project Coordinator & Manager

Re: uBitx FT8 problem


On Mon, Oct 1, 2018 at 11:12 AM, Doug W wrote:
My USB cable is not shielded... its important?

Re: uBitx FT8 problem


On Mon, Oct 1, 2018 at 11:19 AM, John P wrote:
There I can find the split mode on WSTJ-X? Because,  I'm getting the first steps on digimodes, so so I do not know much yet..

BITX 40 Arduino dead #bitx40help #arduino #bitx40

SaMa photo SaMa photo

Good morning
for my mistake, Arduino is dead! With what can I replace all the vfo of bitx 40 ?
I found this on ebay can be fine?
Or do you have anything else to recommend? 26algo% 3DREC.SEED% 26ao% 3D1% 26asc% 3D20160908105057 26meid%%% 3Ddd4f229114424c0ebc8cfab6b9d84b99 26pid% 3D100675% 26rk% 3D4% 26rkt% 3D15% 26sd 3D262916095852%%% 26itm 3D113253558726 & _trksid = p2481888.c100675.m4236 & _trkparms = pageci% 3Ac93f3402-c5a8- 11e8-9406-74dbd18099ed 7Cparentrq%%% 3A30ea06f71660ab1d0a1fc633fffb2813 7Ciid% 3A1
Thank you

Re: uBitx FT8 problem

Doug W

On Mon, Oct 1, 2018 at 01:35 PM, <slamer555@...> wrote:
There I can find the split mode on WSTJ-X? Because,  I'm getting the first steps on digimodes, so so I do not know much yet.
file/settings/radio/split operations

Re: uBitx FT8 problem

Doug W

On Mon, Oct 1, 2018 at 01:30 PM, <slamer555@...> wrote:
My USB cable is not shielded... its important?
Try John's suggestion first about checking split mode.

Re: Adding /modifying firmware. #firmware


Turn power off to Ubitx
Choose correct com port. Com7 on my laptop probably something else on yours.
38400 Baud
Press Connect
Press Read from Ubitx
Put Call sign in Text box 
Press Write to Ubitx follow prompts
Press Save to file so you can reload a good config in the future if you have a problem.
Power Ubitx back up
That's it.



Hello Joe,

I did build the ND6T AGC circuit on veroboard; I noticed the same signal decrease; I can only figure that the impedance of the grounded emitter 2N3904 input is too low and consequently is loading too heavily on the audio line.
I did replace the 2N3904 with a FET amplifier and the high impedance of the gate is causing no load to the audio line.
I do not hear any spikes on the signal with the AGC operating; do you have the RF-gain potentiometer (1-5 kohm) mounted?; when an ungrounded antenna is being used, the drain of the AGC FET is high imp on the antenna side and high imp on the RX side;this may cause static buid-up; I recommend a galvanic connection to ground (1-100kohm) of the antenna (can be parallel to the FET).
ND6T mentions the RF-potentiometer to be used with the AGC-board.



Op ma 1 okt. 2018 om 16:14 schreef Joe Puma <kd2nfc@...>:


So I installed the ND6T and I think its working but the results are questionable. It seems to decimate my signal completely only allowing the littlest of signal in. I have to turn up the volume all the way to hear anything. With it inline it obviously ruins the experience of the IF out and waterfall as it reduces RF on the whole viewable band. My IF tap might need to be moved somewhere else, not sure if it can be put before the AGC as that’s a different stage before 45mhz crystal and mixing right? (shooting in the dark here).  We can address that later.


Another thing I noticed as the ND6T AGC introduced some spikes back into the signal path. I put the AGC after the BCI filter thinking it would be better to AGC a cleaner RF signal without all that AM IMD. I’ll post a pic of the bard layout so you can see my solder work and where I put the components.  I don’t think I messed up there but its odd that when the AGC is in place the overall signal drops at least 60-70%. Yes I can some signals but weaker signals just disappear. I figured that my signal wouldn’t be attenuated maybe even amplified if signal was lower then expected and then just attenuate the stronger signals.



This is with the AGC inline by disabled with the jumper across JP1. There are some noticeable spikes when inline compared to when its not. I don’t have a current comparison without it inline.




This is a shot with the AGC enabled. Jumper on JP2. The signal is mostly gone. I was playing with the volume control and where you do see signal further down the water fall is when I had the volume knob turned up. You can see the evenly spaced spikes too.









Sent from Mail for Windows 10


From: Joe Puma
Sent: Monday, September 24, 2018 7:00 PM
Subject: Re: [BITX20] ND6T AGC


Thanks everyone. I was able to secure a kit, thanks Mark!





Sent from Mail for Windows 10


From: Dennis Zabawa
Sent: Monday, September 24, 2018 1:46 PM
Subject: Re: [BITX20] ND6T AGC


You can get a board ONLY from:



Re: Low Pass filter inductor question. #filters


Yes, both legs must be switched.   The reflection of the if the unterminated filter will be across the 
one in use.   At a bare minimum you have to test to insure it will work but generally its going to
be trouble.

Its not a shared ground.  Its the shared hot!  What does a 40M filter look like at 20M?
What does a 20M filter look like at 40?  Hint the 20M will pass 40M signals (and possibly harmonics),
But the 40M will not pass any 20M signals.  So a filter that does not pass 40M across a 20M filter
has to have bad effects.

You  need two sets of contacts.  



Don, ND6T

The AGC is a simple wide band attenuator, When properly powered and with a short across J1 there should be only about 0.6 dB attenuation (barely measurable). No artifacts.
Check your wiring and your voltages. While it is possible that a component has failed, it is unlikely.
Yes, the SDR display looks very lame. Did you try installing it before you did the AGC mod? Best to do one modification or experiment at a time to avoid confusion, no matter how small a change.
There are too many variables to properly address from afar. Where did you derive your 5 volts?, Did you install a manual RF gain control? Did you make any voltage measurements? Did you install the filter before you did the AGC and the IF tap? By "spikes" do you mean spurious signals (frequency domain) or impulses (time domain)? When you tune the transceiver do you hear whistles? Do those spikes change when you replace the antenna with a termination?

W0EB's uBITX with 5" Color "mouse" Screen 1st QSO!!! #ubitxcw #ubitx

Jim Sheldon

Finally got time enough after all the work on the 5" color TFT touch/mouse/keyboard display on our BITeensio card in one of my uBITX rigs that I was tuning around 20 meters a few minutes ago and heard CT9/OM7LW on 14.014 working split 1 up. 

Gave my uBITX a good test of functions - put it in split, set the TX frequency to 14.015, mode to CW and called him.  Measured 4.89 watts out and I got him first call.  I don't believe the 599 signal report he gave me, but then I don't believe in S meters either.  He WAS quite strong on my little PAR EndFedZ 40-20-10 meter antenna which is only about 15 feet or so above the ground and quite close to the roof of the house.  I normally use this antenna only for testing so I'm super pleased that this particular uBITX's first QSO was a DX station on Madeira Island!  Don't get too much better than that!

Using the mouse and that screen, setup for split was super easy, took only seconds and I made the QSO. 

I had spent the previous hour and a half changing out the fan on the case for a bigger one that moves more air to keep the 3.3V heat sink cool.  I do believe I have my hamfest demonstration rig working (have to give a presentation this coming Saturday at the Wichita, KS hamfest on this and the 2.8" color display version.

Jim, W0EB

Re: PTT switching for amp


I am also building a 70w amp and this is what I am working on.  The circuit on the left I use as a RF indicator so I and see my Mic modulation in my radio,  I am making another with the relay circuit for inside the amp.

Lee - N9LO  "I Void Warranties"


Re: Low Pass filter inductor question. #filters


Ok...I see what I did wrong now.   That's embarrassing...Ha!

So to be clear... Is it sensible to just switch the 40 meter out of the circuit (for 20),  and leave them both in for 40? Would that be too much,... I think the phrase is, "insertion loss"?   Or better to keep them entirely separated?

Thanks for your patience!