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As this is still relevant to this topic I refrain from opening another thread and write here again.

I can confirm Mark's problems with the speed of the 100ppr encoder:
If the encoder is span slowly it works acceptable, but if the speed is increased, problems arise (See my reference

Has anyone found a way around this for KD8CECs software?

There are of course different ways which can be tried:

The following methods I thought of, but they are also burdening up some other problems (at least for me)

1.) My first idea was to simply change to a Arduino Nano Every to keep investements low and to gain something from the change. It's a bit faster, pin compatible and has interrupts everywhere but the eeprom is smaller and it will probably not work with the uBITX Manager. And it also does not compile as the softserial_tiny.cpp is incompatible and would require a rewrite (or a write out of the libray)

2.) Just changing the pins to interrupt capable ones and use another libray for the encoder.
This might be a solution as? Pin 2 and 3? are at the moment used for the CW key and TX-C (I think) which seems to control the low pass filters. I would need cut some connections and rewire here to make the software experiments possible with an unknown result.? Therefore I would rather just try a? software approach.

3.)Try to use portmapping to be able to read out the encoder faster. I found the but I am not sure if it can be used with analog inputs.
KD8CEC uses the following code to check the encoders status:

byte enc_state (void) {
??? return (analogRead(ENC_A) > 500 ? 1 : 0) + (analogRead(ENC_B) > 500 ? 2: 0);

The libray above only supplies

• digitalWriteFast(pinNum, state) (sets or clears pin/port faster)
• pinModeFast(pinNum, mode) (sets pin/port as input or output faster)
• digitalReadFast(pinNum)(reads the state of pin/port faster)

So no support for analogRead. And I guess if it was possible to read out the analog ports digitally,
this would have been done by KD8CEC before using this workaround.

Does anybody have an idea, what could be done?

Sascha

Here in cuba not is possible buy component, i an take the aviable components .

Fun fact, when I start to touch and move around the brown wire from volume control knob, I can hear local FM radio station.

Cant see well enough to finish
Ubitc ver 4 mounted in chassis along with auto tuner and power supply. Switches and jacks installed. Includes pc oscilloscope and RF tap for use with oscilloscope.

?search uBitx on ebay

Hi! I've just finished assembling my Bitx40, and when I turn on the radio, I hear a terribly loud noise (link to listen below). The radio works fine, because I can hear some operators behind that noise, but I cannot tune the radio loud enough to hear them properly, as the noise is extremely loud even on the smallest volume. I don't really know what's happening gere. Any help?

The noise: https://www.youtube.com/watch?v=1j0ywo45N7I

Ivan

cool stuff.? remember that 4.7 k resistor you installed?? find the 'outside' of the resistor - and arrange a push button connection to ground.? the Raduino reads the voltage created at the 'inside' of this resistor (you can see it then with a DVM) to command the rig to transmit a CW signal.? the outside of course goes to where a key jack is located (whether you installed one or not -- this push button can exist simultaneous with a key jack).?

Curt

Hi Friends !

My name is Ivan and i'm a happy owner of a V4 microbitx. I'm not using CW mode in my Microbitx but i would like to add a switch in the front panel to send the cw tone in order to tune.?

If someone can give me a hand i will appreciate?

KN4TOU?

thanks

You could use one of these inexpensive ($5 ebay) Texscan LC filters for a 70 MHz IF and it might go well. These are 25 kHz wide at the 1 dB points and I have not seen a curve but the data sheet says "sharp skirts".??

thank you but if i change the frequency to 60 mhz or more i have to change the value of the capacitors and the number of turns?

Yes a low amperage fuse for now. There are many linear power supplies well under 10 amps on the planet, likely you can find one at what you in the UK refer to as a rally.

I have a little mfj switching supply, and I imagine some have homebrewed one similar.

Enjoy your build.

Curt

Mark, interesting...I really know nothing about the legacy as this v5 is my first ubitx, but not my first home built rig.
I can't imagine a corrrectly designed filter would have a 3db or greater insertion loss, perhaps using wrong values by experimenters on earlier version could cause this. I suspect Allison is correct with just a wrong part in my filter.
In-circuit measurement isn't easy, I may try to use my vna on it to check it's transfer function, or just unsolder a few and measure..
Thanks all!
Brad

On Mon, Aug 19, 2019 at 06:26 AM, Jack Purdum wrote:

but this article looks like it could help:

What an interesting site. The site that host the article you linked:

Has a lot of interesting projects and articles. It is amazing how well the experimenter/maker/hobbyist world is doing, with so many sites devoted to technology for experimenters. The projects now days were just science fiction dreams 30+ years ago.

Tom, wb6b

hello i have finished building the ubitx CM2KMK version and i have problems with the 45mhz crystal filter. the only filters i have in my inventory are the following--
22M03? ? ? ?45,1mhz? ? ?from a motorola GM300
49S10B? ? ?49,95 mhz? ?from a kenwood TK760
FL-210? ? ? ?21,8 mhz? ? ? ?from Icom M59
I have tested all of them by changing the frequency acording to each crystal in the source code.The best results so far i get with the 21.8mhz filter FL-210.
iI think the problem is matching the impedance with the two coils L5 and L7 i used 12 turns on T37-6 .
Please if someone have any documentation about the filters or knows what impedance they have i wil be very thankfull.
Thanks in advance ! 73de yo4huj

thank you very much now i understand. 73 all the best

Thanks.? This is exactly what I was looking for.? If I dive in, i'll go V5.

I think that you need to answer that question for yourself.? If you go back and read some of the threads in this group for Spurs and Harmonics, you will see that there are a number of modifications that you would need to make to bring the version 3 (v3) into FCC compliance.? So if you like to modify things, the v3 will give you a lot of opportunities beyond adding things.? You may also be equipment challenged to verify if you have tamed the spurs, any second receiver with some measurement system should be able to help with the harmonics, or just use SSB and not CW.

There are also comments about key clicks and audio issues with the v3 on this group.

If you want to learn allot and jump into kit modding, get the v3.? If you want to build a fairly compliant semi kit and add improvements of functionality (touch screen, AGC, S meter, ect..), buy the new v5.? Your choice.

FWIW
73
Evan
AC9TU