Date   
Re: Sunil cases

Mark Hatch
 

Sam

thanks for the correction!  I happen to have two Sunil cases, one with and one without the audio amp. Have not installed the audio amp yet so now I know how it is supposed to function...

73
Mark

Thanks!

vonrich@...
 

Hi All,

I've been having a ton of fun with my uBitx and just wanted to thank the group for all the great ideas and mods.

So far it's mainly been used for FT8, I'm impressed this little board reaches over 12000km on 20m. 

Mods I've done so far include:
- Alison "Best Bang for Buck mods" are in and working well
- AM broadcast band filter, I did this the lazy way.. but it appears to work! I don't hear any AM stations on the HF bands anymore. :) see pic
- rtl-sdr with HAM It Up connected
- PA has copper CPU heatsink and fan
- PA power @ 24V with larger caps
- Upgraded firmware to CEC
- Fans added to cool things down.. T11 and 2222s get warm and power drops off. (fans sucks.. lots of RF noise) 

T11 really isn't taking the 35W+ to well ;) so that'll be the next mod.  the group had some good ideas for T11 improvements.

I did run into a few issues when I was testing the limits of the SWR...  lots of 510s let the smoke out and one went across the room :)

I was going to move the uBitx to a nice case... but it's growing on me as is.  I'll probably order another one to make a portable rig.

Anyways, thanks for the great project and ideas!  here's a few pics of my hacked together uBitx.

VON









--
Brendan / VA7VON

Re: Antuino

Ashhar Farhan
 

We can handle this in two ways:
1. using this plot as a guide, we do a look up table in the firmware that corrects the slope.
2. Fix the IF amps with higher power levels. The trouble will be with the IMD of the mixer at above -10dbm point.
I think if we can correct this from -10dbm to -70dbm, we will have a good enough instrument for most needs.
- f

On Mon, Jun 3, 2019 at 6:15 AM Michael Aiello <n2htt.mike@...> wrote:
I was wondering if your results were particular to your unit, or could be seen generally, so I tried reproducing your experiment, and got very similar results. Using an MFJ antenuator, ran the test on 40 meters, see plot below

73, Mike N2HTT

Re: Availability of Mag Loop and other stuff...

iz oos
 

Just for curiosity, I have simulated (the same link suggested by LNR or PARelectronics) a no brand small loop I bought from a hamfest. It is for 2M, when I bought I was told efficient at 95%, SWR=1 at 145Mhz. Actually SWR was perfect but I was never impressed... simulated results show a negative gain around -20db!!! Not exactly the same value said by that vendor... Where does all this energy go???


Il 03/giu/2019 04:08, "ajparent1/KB1GMX" <kb1gmx@...> ha scritto:
Radiation pattern of the reference antenna EFHW varies with frequency. 

Loops however are very predictable and the pattern is well understood and
does not change with frequency until it no longer a small loop, its why they
are used.

A multi turn loop has a lower frequency to size (total lenght) where the pure loop
behavior departs from the predicted.  Its easy to see that as the deep nulls are no
longer along the though axis.  By then a smaller loop is likely desirable.

The whole 2M thing was a frequency where testing can be done without great
time and expense.  One does not have to be interested in the higher frequency
to get useful and accurate data.   It is a common practice in the industry to scale
to a frequency where its easy to do the needed testing in smaller spaces or even
a metallic or wood work surface.  

I do have a 144mhz (4 inch diameter) tuned loop for noise DF (RX only or under 1W)
and the nulls allow me to determine where on a pole a noise source is once I know
which pole.  Very sharp nulls.

In general two costly items are the cap and if padding caps are used suitable high
voltage and high current fixed value caps of decent Q.     The element is copper
tube and not a high price item considering how much is required.  Copper is
preferred over aluminum as aluminum has a higher resistance and if oxidized
(its normal state) the oxide surface s a near insulator.  Also copper can be hard
soldered (silver alloy) using MAPP gas torch.   

Allison

Re: Pin Change Interrupt library

Vic WA4THR
 

First, just to be sure, are you trying to upload new firmware to a BitX40 or to a uBitX? The CEC sketch you mention will only work on a uBitX. If you are trying to improve the firmware on a BitX40 you'll want to get the Amunter sketch, which is very good and offers similar improvements to that rig. Plus, his included and illustrated instructions are excellent.

Second, when I started messing with firmware I found the "Raduino Software for Geezers" very helpful:
https://groups.io/g/BITX20/message/26522?p=,,,20,0,0,0::Created,,software+for+geezers,20,2,0,5045944

=Vic=

Re: Antuino

Bruce Hall
 

Farhan,

I forked your code and started to look at this very issue from a lookup table perspective.  It will certainly help add useful range to the unit.   The closer you get to the "tails" of the graph, the harder it becomes to compensate, however.   I will report back when it's done.

I also worked on the rotary encoder routines, attaching the encoder inputs to interrupt routines rather than reading analog values.   As a result the encoder is a bit more responsive.  Have not posted this yet.

Bruce

On Mon, Jun 3, 2019 at 2:15 AM Ashhar Farhan <farhanbox@...> wrote:
We can handle this in two ways:
1. using this plot as a guide, we do a look up table in the firmware that corrects the slope.
2. Fix the IF amps with higher power levels. The trouble will be with the IMD of the mixer at above -10dbm point.
I think if we can correct this from -10dbm to -70dbm, we will have a good enough instrument for most needs.
- f

On Mon, Jun 3, 2019 at 6:15 AM Michael Aiello <n2htt.mike@...> wrote:
I was wondering if your results were particular to your unit, or could be seen generally, so I tried reproducing your experiment, and got very similar results. Using an MFJ antenuator, ran the test on 40 meters, see plot below

73, Mike N2HTT

Re: Antuino

 

Try a 12K from pin 4 to ground of AD8307, in another application some issues were cured by this.
The nano is very high impedance and the 0.1uF from pin 4 to ground will take time to change value.

Raj


At 03-06-19, you wrote:
Farhan,

I forked your code and started to look at this very issue from a lookup table perspective.  It will certainly help add useful range to the unit.   The closer you get to the "tails" of the graph, the harder it becomes to compensate, however.   I will report back when it's done.

I also worked on the rotary encoder routines, attaching the encoder inputs to interrupt routines rather than reading analog values.   As a result the encoder is a bit more responsive.  Have not posted this yet.

Bruce
w8bh.net

On Mon, Jun 3, 2019 at 2:15 AM Ashhar Farhan <farhanbox@...> wrote:
We can handle this in two ways:
1. using this plot as a guide, we do a look up table in the firmware that corrects the slope.
2. Fix the IF amps with higher power levels. The trouble will be with the IMD of the mixer at above -10dbm point.
I think if we can correct this from -10dbm to -70dbm, we will have a good enough instrument for most needs.
- f

On Mon, Jun 3, 2019 at 6:15 AM Michael Aiello <n2htt.mike@...> wrote:
I was wondering if your results were particular to your unit, or could be seen generally, so I tried reproducing your experiment, and got very similar results. Using an MFJ antenuator, ran the test on 40 meters, see plot below

73, Mike N2HTT

Re: The Selcet button, playing crazy set itself independently if press PTT on additional Mic Zetagi M99.

sdr freak
 

Hi @ Sascha, Evan, Martin 

The english i have is not the best i know but i hope you can read and understand my Information about that what is supposed to mean. 

THANK YOU VERY MUCH FOR YOURE ANSWER!

Very Helpful and now it is logical to see the issue in the Antenna from this day, i used Longwire and no 1:1 Balun and directly this could be the hole problem. First on this Day i used the Longwire, i had an 20min QSO with nice conditions on 80m and no problem of this fails but than i would start the next QSO on 40m and the issue was active but i think it has could start before on the QSO, so it was not the Band switch i think it was random that starts at the second QSO..

The Longwire was 20m wire on MFJ948 tuner at Wire Antenna pin and on the Groundscrew under that Wire Antenna pin a have set for the Grounding an 20m wire to an thick aluminum rod which stuck in the ground there and carries a shield for water supply. This rod i thick stuck more than a meter in the earth and should be good ground.

The picture from my ubitx, the ground cable from power in ground to chassis, an other grojnd point at the button the yellow wire was soldered to the metal ground from the button to grounding this on the chassis like seen in a wire up shematic..

The other picture is the R63 at mic audio curcuit with 47ohm and i soldered paralell a 47ohm resistor to this for havd an better mic amplifier gain with reduced resistor from original 47ohm to 22ohm. This was an idea for set more output power on ssb but it only helps to speak at normal and before i had eat the mic when would have a bit output. Unfortunately, the performance has not become more than five watts, althought i thought it worked then after set 47ohm to 22ohm to have more power output.. but this is an other issue of my ubitx and here i would talk about the things first you say i should do at next to repair the hf input or grounding failure and then repair the other things like low power output.

Ok now i want to repair this failure and look for the step i should do at the grounding wire in the ubitx, gor better understand can you please upload a few pictures of your ubitx where could see the wiring of your answer? I look for an option to put a cap to the mic, but on the originale mic capsuale i have to low power output and no idea for homebrew mic preamp that works, and the zetsgi mic i don't know where is the best point for the 1nF cap to add in the circuit or should i add the 1nF cap on between the zetagi mic capsuale positive and ground, too?

The ferrite is an great idea an i want make this, too. But at which point is the best? And for the p2 pin to the  so-239 i would make your idea, too. I have thought many times of this point but i have not do it till now, but i upgrade the rg58 or rg174 cable there today. 

Thanks for your all very helpful answers, many thanks!

If your have ideas to my other issue with the 'low power output, only 5w on 80m 40m 20m and 1w on 15m and 10m' i would very happy if so. The thread is, https://groups.io/g/BITX20/topic/what_s_a_reason_for_less/31668480?p=,,,20,0,0,0::recentpostdate%2Fsticky,,,20,2,0,31668480

Re: Pin Change Interrupt library

Jack, W8TEE
 

You could move the interrupt header file into your project directory and use:

    #include "PinChangeInt.h"

instead of

    #include <PinChangeInt.h>

This will force the compiler to look in your project's directory for the file before search the default library path. It's not a "real" solution, but it might work. (I don't use RasPi, so this is a guess in that environment.) Also, what version of the IDE are you using? The latest is 1.8.9 and I would upgrade to that.

Jack, W8TEE

On Sunday, June 2, 2019, 11:00:33 PM EDT, Dexter N Muir <dexy@...> wrote:


Thanks for that! Installation of the IDE years ago created a 'libraries' directory, so I git cloned there by Terminal (RasPi).

Now to find a mini- (not micro-) USB cable. Had one once: wonder where it waltzed off to? :)

Ah. Found. On a portable hard-drive.
OK, verify. Still no go.

Sketch/Import Library, it shows as Contributed but still no go: won't find the library. Where does that have to be put? That's what I mean by 'instructions' - or link to ...
Jeeez ... Am I *THAT* dumb?


Re: What's a Reason for less Power Output ONLY get 4W on 80m?.., 3-4W on 40/20m, 1W on 15/12/10m #ubitx #ubitx-help

sdr freak
 

How to check the Filters for failure that lowering the power output ? In the software i use CEC 1.08 is an option in the programm ubitx manager with the filter value and now i think about the value if is not right then the low power output is produced by this way or is that an other way you mean with check the filter..

When the power output (ssb and cw) is max 5w at 80m and 4w max on 40m and 20m, but only 1w or 1.5w on 15m and 10m and the messuare with the Dummy Load and on many antenna tested with 2 different Tuner and every time the power is same and not higher, what should i check in the ubitx circuit for V oder A or mA value at few points to figure out the issue at which point it is, are there any value i should messuare on the board, to help me better? 

The oscilloscope, i thought could be useful for see the modulation to set the right value on RV1 i thought, when see how many grade of modulation, to keep not over modulation but use the maximum power for RV2 and RV3, but the messuare should figure the maximum modulation point in sine wave looks good. Is this right and which way you connect the ubitx transmitter to an oscilloscope for see the modulation grade in rv1 is ok? ubitx-》dummyload-》attenuator-》oscilloscope ? The rv1 is select to a sine wave before over modulation it, and then should be the power output in the original ubitx over 10w on 80m and 40m, but not only 5w? 

The RV2 and RV3 is set like hfsignals was say, and even when i set rv1 to max ccw then the power is not much more, perhaps 1w more than before on the band messuared

The R63 resistor 47ohm, to this i soldered and 47ohm resistor parallel in hope for more output but only the mic speaking would be better then before i eat the mic to have output and now it was able to speaking in normaly volume but the same 5w output power. 

(mic gain soldered a 47ohm parallel to the R63)


Ok i hope for any answer. Thanks.

Re: What's a Reason for less Power Output ONLY get 4W on 80m?.., 3-4W on 40/20m, 1W on 15/12/10m #ubitx #ubitx-help

iz oos
 

Once my Drake was delivering just 70 watts... I thought it was the age... Nope... There was a bad solder in my SWR PWR.... and the power was back to 140w! This is to say not to always trust in power meter.


Il 03/giu/2019 15:48, "sdr freak" <sdrfreak55@...> ha scritto:
How to check the Filters for failure that lowering the power output ? In the software i use CEC 1.08 is an option in the programm ubitx manager with the filter value and now i think about the value if is not right then the low power output is produced by this way or is that an other way you mean with check the filter..

When the power output (ssb and cw) is max 5w at 80m and 4w max on 40m and 20m, but only 1w or 1.5w on 15m and 10m and the messuare with the Dummy Load and on many antenna tested with 2 different Tuner and every time the power is same and not higher, what should i check in the ubitx circuit for V oder A or mA value at few points to figure out the issue at which point it is, are there any value i should messuare on the board, to help me better? 

The oscilloscope, i thought could be useful for see the modulation to set the right value on RV1 i thought, when see how many grade of modulation, to keep not over modulation but use the maximum power for RV2 and RV3, but the messuare should figure the maximum modulation point in sine wave looks good. Is this right and which way you connect the ubitx transmitter to an oscilloscope for see the modulation grade in rv1 is ok? ubitx-》dummyload-》attenuator-》oscilloscope ? The rv1 is select to a sine wave before over modulation it, and then should be the power output in the original ubitx over 10w on 80m and 40m, but not only 5w? 

The RV2 and RV3 is set like hfsignals was say, and even when i set rv1 to max ccw then the power is not much more, perhaps 1w more than before on the band messuared

The R63 resistor 47ohm, to this i soldered and 47ohm resistor parallel in hope for more output but only the mic speaking would be better then before i eat the mic to have output and now it was able to speaking in normaly volume but the same 5w output power. 

(mic gain soldered a 47ohm parallel to the R63)


Ok i hope for any answer. Thanks.

Re: Availability of Mag Loop and other stuff...

Bo Barry <bobarr@...>
 

My conclusion so far is that the mag loop is fun, educational, amazing especially that it does work indoors, does a pretty decent job on FT8, is A solution for HOA owners ( gutter or hidden EFHW are BETTER Solutions), AND in NO way compete with full size antennas. 

P.S. I've found an old Palomar Engineering noise bridge to be the very best way of tuning!  Found on eBay. It does both X and R.
--
Bo W4GHV - since '54

Re: What's a Reason for less Power Output ONLY get 4W on 80m?.., 3-4W on 40/20m, 1W on 15/12/10m #ubitx #ubitx-help

sdr freak
 

Then ok but in 2 different SWR POWER Meter the low power of only 5w and in the Dummy Load,  too? This means the Dummy Load is bad, too? Have you any other ideas to my postet infos please? Any idea i should do?

Re: ubitx 2.0 - Mic cannot get to TX

Dave New
 

Just by pure happenstance, I plugged my KX2 mic into the 1/8" jack that comes with the cabinet kit, and it works like a charm.  The up/down buttons don't work, but the PTT and audio are fine.

-- Dave, N8SBE

-------- Original Message --------
Subject: Re: [BITX20] ubitx 2.0 - Mic cannot get to TX
From: "Ashhar Farhan" <farhanbox@...>
Date: Sun, June 02, 2019 1:13 am
To: BITX20@groups.io

Good going!

On Sun 2 Jun, 2019, 7:40 AM Sajid Rahum via Groups.Io, <zs735=yahoo.com@groups.io> wrote:
All sorted out. my goodness.

Here goes for those wanting to use Baofeng.  First there are tonnes of 'Baofeng' knockoffs.  Now, i dropped out the wiring and replaced it using a ethernet cable which a roll was laying around.  The wiring in these units is attrocious and cannot be used.

1.  Stereo 3.5 is required - not mono
2. Drop the wiring and cable out and replace with ethernet cable.
3. replace the baofeng electret with ubitx electret; drill larger whole.  two wiring is straight forward.  
4. Wiring:

                  A     B    C
                ------|---|------------\
                       |   |                \
                ------|---|------------/


    On the board it will be marked M, M- and PTT.
    M will go to C.
    M-- will go to A
    PTT will go to B

Power out is very low and one needs to shout much into it.  By removing the speaker i should be able to get the audio amp in to improve drive.


Re: Availability of Mag Loop and other stuff...

ajparent1/KB1GMX
 

A SWR of 1:1 is easy with a dummy load but as a radiator its efficiency is very poor.
Some antennas can be matched to a good SWR and still be poor radiators.

SWR is not a measure of antenna effectiveness or efficiency its a statement of
how well the load is matched to the source.

So where does the energy go, mostly heat.  the comment I hear often, I I can
measure no warming, completely missing that all that copper or aluminum
will radiate heat well. 

Allison

Re: What's a Reason for less Power Output ONLY get 4W on 80m?.., 3-4W on 40/20m, 1W on 15/12/10m #ubitx #ubitx-help

Arv Evans
 

A detector probe or oscilloscope should show where power differs from one band to another. 
Voltage measurements should show relative differences.
That could provide some clue as to where to start troubleshooting.

_._


On Mon, Jun 3, 2019 at 10:40 AM sdr freak <sdrfreak55@...> wrote:
Then ok but in 2 different SWR POWER Meter the low power of only 5w and in the Dummy Load,  too? This means the Dummy Load is bad, too? Have you any other ideas to my postet infos please? Any idea i should do?

Re: What's a Reason for less Power Output ONLY get 4W on 80m?.., 3-4W on 40/20m, 1W on 15/12/10m #ubitx #ubitx-help

iz oos
 

The fact that pwr out is around 50% is suspicious. Maybe one of the two sides of the pushpull PA has an issue.


Il 03/giu/2019 18:40, "sdr freak" <sdrfreak55@...> ha scritto:
Then ok but in 2 different SWR POWER Meter the low power of only 5w and in the Dummy Load,  too? This means the Dummy Load is bad, too? Have you any other ideas to my postet infos please? Any idea i should do?

Re: What's a Reason for less Power Output ONLY get 4W on 80m?.., 3-4W on 40/20m, 1W on 15/12/10m #ubitx #ubitx-help

ajparent1/KB1GMX
 

I would ask questions like:

What is the DC applied voltage during TX?   It sounds low for CW even.
For CW I'd expect near 10-12W however if you Power supply is below
12V what you are getting is then good.

What is the mic level or if your using a tone osc what audio (AC) votlage?

is the bias correctly set?

IS the calibration done correctly? is the sideband carrier or the second
conversion is off the band pass filters (crystal filters) will eat your RF.

NOTE CW is done differently than SSB so if SSB is more than half the CW
something is wrong. 

Look at the obvious before progressing.

Allison

Re: Availability of Mag Loop and other stuff...

Kees T
 

Bo,

Speaking of using Noise Bridges, there is an excellent one by N6DT
http://www.nd6t.com/antenna/Polite%20Tuner.htm

Re: Availability of Mag Loop and other stuff...

ajparent1/KB1GMX
 

Bo,

I have the Palomar noise bridge unit and its a very useful tool.
Worth way more than the price I paid for it (1$ at a flea).

Allison