?

The main entry point for any Arduino project is the file that contains setup() and loop(). The file that holds those two functions must have the secondary file name *.ino. For Reed's code, the file is ubitxv6.ino. The purpose of the setup() function is to establish the environment in which the code is to run. The purpose of loop() is to provide a continuously-running body of code and is the work horse for the program. I would start with setup() and then proceed to loop(), looking at the function calls in each. If you need help understanding the C code, I can give you a (very biased) book recommendation.

--
Jack, W8TEE

?

The main entry point for any Arduino project is the file that contains setup() and loop(). The file that holds those two functions must have the secondary file name *.ino. For Reed's code, the file is ubitxv6.ino. The purpose of the setup() function is to establish the environment in which the code is to run. The purpose of loop() is to provide a continuously-running body of code and is the work horse for the program. I would start with setup() and then proceed to loop(), looking at the function calls in each. If you need help understanding the C code, I can give you a (very biased) book recommendation.

--
Jack, W8TEE

From: [email protected] [mailto:[email protected]] On Behalf Of Arvo W0VRA via groups.io
Sent: Friday, May 29, 2020 2:41 PM
To: [email protected]
Subject: [BITX20] Transverter for 6 meters on eBay

?

After I posted this I was looking back and figure out that I probably
would not have enough to run the mic.

On May 29, 2020, at 2:13 AM, Evan Hand <elhandjr@...> wrote:

?Dan and others,
When comparing the options, first think about what you want from the radio/modification process.?

If you are a tinkerer/programmer and want to dabble in the software, the TSW solution can make sense as it is open source and you have a lot of memory and speed available to add things.

If you are more into operating, then I believe that there are more options available with the KD8CEC/Nextion including IF shift, Attenuation, Spectrum Scope, and others when a 2nd Nano is added.? You should look through all of the choices on the HamsKey.com blog.? One of the big ones for me is the Memory Manager software that does not have an equivalent on the other choices.? There is also support for an SDR link to have a panadapter on a linked computer with many SDR dongles.

The last thing most will consider is future upgrades.? I would not put too much into this category, as the v6 changed a lot of the future direction recently, and that can happen again.? With that understanding, we have not heard much from Dr. Ian Lee recently.? All of his code is open source, so anyone could pick it up and add a new feature.? The TSW activity is recent, focused on the new v6, and also open source.? All of that makes it a wash for me.

Hardware modes like AGC, Speach compression, CW audio filters can be done on any of the above mods.

If I were just starting with the uBiTx, the order would be:
1 - First get it working as supplied by HF Signals.?
2 - Fix any hardware issues like the mic problems.? Clean up the sound (small mod to the LM386 to remove hiss).? Install diode protection if it will be near higher power transmitters without a grounded antenna input.
3 - Try out the FREE software from Reed to improve operability.? You can always go back, it is software.
4 - Add an AGC mod.? I have not done this yet, and have two different versions to try.? I would suggest one that reduces gain prior to the audio sections, either at the first RF sections or the IF sections.
5 - Then go for more complex upgrades based on what you want to do with the radio.? I have 3 and have focused one on digital, working on one for CW and a general use radio with ease of use items.
6 - Add a linear amp.

Above are my opinions.? Others may be different, and that is as it should be.? You need to make your own choices and live with the results.
73
Evan
AC9TU

Hi all

I have unpacked my uBitx v4 board with v4.3 firmware (I have some time now to do radio!!).

Having wired it up it seems that I cannot set the BFO correctly. I followed Vic's thread here (/g/BITX20/topic/ubitx_v4_3_calibration/29061748?p=,,,20,0,0,0::recentpostdate%2Fsticky,,,20,2,0,29061748 ) and the you tube videos by VK3YE, but it seems each time I set the BFO Frequency, save the setting, the settings are not actually saved.

Any advice ?

Thanks

Adrian M1LCR

From: [email protected] [mailto:[email protected]] On Behalf Of Evan Hand
Sent: Friday, May 29, 2020 4:08 AM
To: [email protected]
Subject: Re: [BITX20] Will this mic work?

?

As far as I can tell without the schematic of the mic, it will not work.? The input of the uBitx has approximately 5 K ohms for the bias of the electret element.? If the current draw of the mic is 5 ma, then the drop across that resistor would be 25 volts.? At most the supplied voltage is 12 volts (13.8 with a "normal" ham supply).? Not enough to run the mic.? You would need to drop the resistor in the uBiTx mic circuit (R60) to 680 ohms? That would give a drop of (680+220)*.005=4.5 volts? That leaves 7.5 volts for the mic.? NOTE: there is a 220 ohm resistor ahead of R60.

The PTT line on the uBiTx is a direct input on the Nano, so the 2 ma max draw should not be an issue.? If there is an issue, a pull-up resistor (2.2 K) should fix it.

Please double-check the above before you implement it.? My recommendation is to go with another solution like a 9 volt battery in the mic or wire a separate supply at the mic connector in the uBiTx.? This will depend on if you want to use an electret without a built-in amp in addition to the amplified one.? If you are going to dedicate the mic and rig together, then swap the resistor after you do more verification.

Just suggestions.? The short answer is that it will not work.
73
Evan
AC9TU