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Re: 6uH in BITX40 band pass filter? #bitx40

 

The inductor winding (40T) could be tweaked slightly taking turns little closer o to increase 5.76 to become 6uH.
?

please try with little patience you would succeed.

Regards
MVS Sarma
?

On Fri, May 25, 2018 at 4:02 AM, Aldrich Sarmiento <aldrich.sarmiento@...> wrote:
My doubt is because the same pass filter of BITX40 should not have 6uH because the scheme says 40 turns on toroid T30-6. Apparently this does not affect you. On the other hand I thought it was a filter with a series tuned circuit but if you put 6uH in series with 100pF you get 6.497Mhz ...
Additionally Allison, this filter does not have variable capacitance.
Re: Raduino replacement #bitx20

Mike aka KC2WVB
 

I am an old dart like you! Its the price we pay for having done a few things in our lives.
This is interesting: My Raduino is fine. It was the rotary encoder that was preventing tuning and entering the menu. I had initially suspected so and ordered 5, because they are fragile and handy to have, from Digi Key. They were slow coming but arrived Thursday. Once I made the swap all was fine and the radio came to life.
I did order a Mike Hagen/RaduinoUmax today for something to play with and it should arrive early next week.
All in all these rigs are pretty decent for the money involved and very simple to assemble. They are very hackable but I am a math guy not an electronics guy so my hacking is liable to be unexpected by the electronics guys.

On Thu, May 24, 2018, 10:25 PM Bo Barry <bobarr@...> wrote:
You must be an old fart like me.
Nowadays the 'pretty girls' are our grandkids. ?
I built an analog VFO in the 70's, doing all kinds of things to get freq stability with temp changes, etc.

My 2nd ubitx will have the touch display and mega2560 board that I like.

Doing good on FT8 and first CW contact today. The OM had the gall to give me 529!? Never heard if lower than 449. ??.? Had 3 watts on 20.
73, Bo W4GHV since '54

Re: RF power chain mods and improvements..

 

another typo, I used 2N5109's.

glenn
vk3pe
Re: UBITX_CEC firmware upload and uBITX_Manager from a Mac #ubitx #radiuno #firmware

 

I decided to install wine for macOS and give running uBITX_Manager a try, with wine. My test showed it works with possibly a few minor issues.

So, here is how to install wine:

First I needed to install XQuarts (XQuartz-2.7.11.dmg) from?. I rebooted my machine after the install.

Next, I installed wine from here:?.
I selected 'Installer for "Wine Stable" version 3.0.1' downloaded and installed it. I installed the optional 64 bit support and selected the install on a specific drive options.

You run wine by clicking on "Wine Stable" in the launcher or app directory. That launches a command line terminal with the environment set up for wine to run. To run the manager, cd to the directory you saved the manager in and run the following command:?

wine uBITX_Manager.exe

The layout is correct, no disappearing buttons and the scrolling works.

Well just one more thing-- most likely you will have no COM ports show up, to fix that (in the terminal that wine opened up) run the command:

wine regedit

You will get a lookalike of the Windows registry editor. Find the entry for "HKEY_LOCAL_MACHINE\Software\Wine\Ports" and select from "edit", "new", "string value".

(NOTE: Change these values to match your serial device and the com port you want it to be. But, in my case, this is what I used.)
Enter COM1 for the name and?/dev/cu.wchusbserialfa130 for the data.

Now when you start the uBITX Manager you should be able to connect the the?Raduino USB serial port on COM1.

There was a little bit of work around to connect without crashing. To connect to the port, check the Linux compatibility box then connect. After you connect uncheck the Linux compatibility box and select 36,000 baud. The uBITX Manager crashed occasionally when saving a file. But the check/uncheck the Linux compatibility box workaround seemed to fix the file save crashes, too.

As running under wine does have some hiccups, do some testing of your own before you completely trust it. If you find issues and solve them, please let us all know how you fixed it.

(And you welcome Ian, hope these Mac tests are helpful to folks)

Tom, wb6b






?
Re: RF power chain mods and improvements..

 

typo, the last '2M' should be 6M.



On Thu, May 24, 2018 at 10:46 pm, Glenn wrote:

Allison, Nick, all,

This might be of interest

I managed to find a couple of 2N5019¡¯s and put them into my proto driver board (ie Q90 to the push-pull FET driver stage)

The other stages have MPSH10¡¯s with the emitters bypassed with 220pF. The final PP 2N5109 stage using the standard parts.? Ie 22R emitter resistors etc. BUT, I placed a 10R in parallel with the 22R emitter res.

Input level ~ 35mV rms, RV1 at maximum.? 10R added across the 22R emitter Res. Giving about 6.9R

¡¤???????? 160M???? 916mW out

¡¤???????? 80M?????? 994mW

¡¤???????? 40M ????? 943mW

¡¤???????? 20M?????? 837mW

¡¤???????? 10M?????? 663mV

¡¤???????? 6M???????? 364mV

I then decided to boost the high end by bypassing the emitter resistor with about the the same Xc value.? A bit under 900pF so I used 1nF which was to hand.

Results

¡¤???????? 160M???? 908mW

¡¤???????? 80M?????? 950mW

¡¤???????? 40M?????? 960mW

¡¤???????? 20M?????? 1.05W

¡¤???????? 10M?????? 1.02W

¡¤???????? 2M???????? 980mW

This obviously boosted the top end quite well.

The gotcha of course is that this was tested with a 50R output load, which will not be the case with the FET¡¯s connected.? Since I have no FET¡¯s to try this, I can¡¯t go any further.

Glenn

Vk3pe
Re: RF power chain mods and improvements..

 

Allison, Nick, all,

This might be of interest

I managed to find a couple of 2N5019¡¯s and put them into my proto driver board (ie Q90 to the push-pull FET driver stage)

The other stages have MPSH10¡¯s with the emitters bypassed with 220pF. The final PP 2N5109 stage using the standard parts.? Ie 22R emitter resistors etc. BUT, I placed a 10R in parallel with the 22R emitter res.

Input level ~ 35mV rms, RV1 at maximum.? 10R added across the 22R emitter Res. Giving about 6.9R

¡¤???????? 160M???? 916mW out

¡¤???????? 80M?????? 994mW

¡¤???????? 40M ????? 943mW

¡¤???????? 20M?????? 837mW

¡¤???????? 10M?????? 663mV

¡¤???????? 6M???????? 364mV

I then decided to boost the high end by bypassing the emitter resistor with about the the same Xc value.? A bit under 900pF so I used 1nF which was to hand.

Results

¡¤???????? 160M???? 908mW

¡¤???????? 80M?????? 950mW

¡¤???????? 40M?????? 960mW

¡¤???????? 20M?????? 1.05W

¡¤???????? 10M?????? 1.02W

¡¤???????? 2M???????? 980mW

This obviously boosted the top end quite well.

The gotcha of course is that this was tested with a 50R output load, which will not be the case with the FET¡¯s connected.? Since I have no FET¡¯s to try this, I can¡¯t go any further.

Glenn

Vk3pe
Re: Power of rf #ubitx #ubitx-help

??? ??????
 

I changed but i get great value on the 80m and 40m but 20m and 10m is very low 20m is 2 watt and 10m is less than 1 watt


On Thu, 24 May 2018, 9:48 pm ajparent1/KB1GMX, <kb1gmx@...> wrote:
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: Power of rf #ubitx #ubitx-help

??? ??????
 

Thank you very much for your cooperation and helping?


On Thu, 24 May 2018, 7:29 pm Daniel Conklin, <danconklin2@...> wrote:
You might try checking out the thread related to this:??/g/BITX20/message/48158

Re: Power of rf #ubitx #ubitx-help

??? ??????
 

Thank you very much and sorry about what happened but it's mistake?


On Thu, 24 May 2018, 9:48 pm ajparent1/KB1GMX, <kb1gmx@...> wrote:
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: Raduino CAD Files

 

You using maple boot loader?
--
Allen ?Merrell
Re: 2 meter bitx possible?

 

Dual gate mosfets are still a way to go as preamp.? But we are talking a Bitx on two and
there are no others spots for them.

There are various amp modules most have drive requirements of 50mW or more so
you have to have that first.? that means two stages to get to that.? Also not all the
modules are linear they are class C like MHW710s I have a few of them, great for FM.

Allison
Re: Raduino replacement #bitx20

Bo Barry
 

You must be an old fart like me.
Nowadays the 'pretty girls' are our grandkids. ?
I built an analog VFO in the 70's, doing all kinds of things to get freq stability with temp changes, etc.

My 2nd ubitx will have the touch display and mega2560 board that I like.

Doing good on FT8 and first CW contact today. The OM had the gall to give me 529! ?Never heard if lower than 449. ??. ?Had 3 watts on 20.
73, Bo W4GHV since '54
Re: Was: RF power chain mods and improvements.. IS: 45MHz IF Attenuation

 

Farhan,

Sorry, I just realised it was the wrong post.

Here is the correct 45Mhz filter response (the scale was wrong on the first post):

/g/BITX20/message/45700

73, John (VK2ETA)
Re: RF power chain mods and improvements..

 

Hi Dr William,
How is your radio performing with the mpsh10 and rd16hff1 ?
73.
Re: uBitX CEC LSB / USB reversal #firmware #ubitx

 

Let's assume you calibrated to a 1000 khz AM broadcast station.
And that you were 100 hz off in doing so.
Those errors are proportional to frequency, so the 12mhz BFO would be 1200 hz off, enough to flip sidebands.
If you can hear WWV at 10 or 15mhz, that's a much better bet for calibrating.
Or one of the shortwave broadcast stations.

The math is in?post? ??/g/BITX20/message/44515
For LSB mode,? ?OperatingFrequency =? vfo - (clk1+bfo)
If each of those three clocks are off by 100ppm, then by the distributive property of algebra,
the displayed operating frequency is also off by 100ppm.

?


On Thu, May 24, 2018 at 06:10 pm, kj6etl wrote:
I did but I might have done it wrong...Is there a better way then just listening to the audio of an AM broadcast station?
Re: RF power chain mods and improvements..

 

My 3904s were gone long ago in favor of MPSH10s save the predriver which i not settled on yet. ?That stage has to be about 12 db to drive the PA (RD16HHF1s not those silly motor switches). About 28 dBm needed (and id like it to be more like 30 dBm so it can be freq compensated/ flattened if needed).

?

Dr.?William J. Schmidt - K9HZ

On May 24, 2018, at 4:42 PM, ajparent1/KB1GMX <kb1gmx@...> wrote:

WIlliam,

ITs missing a stage if you want to use 2n3904s at 10DB.? However if you use a higher frequency
(and likely a more costly) part that is not required.

Its about gain three stages at roughly 16DB is 48DB plus the finals.
Or you can do 5 stages at 10db each for 50DB and plus the finals.

What you cannot do is stages that start at 16db at 80M and fade to about
10-11db at 10M.? Its hard to get stable gain out of a device that is maxed out.
Doing that often icites instability and oscillation.

Allison
Re: uBitX CEC LSB / USB reversal #firmware #ubitx

 

I did but I might have done it wrong...Is there a better way then just listening to the audio of an AM broadcast station?
Re: uBitX CEC LSB / USB reversal #firmware #ubitx

 

Is the rig calibrated?
If frequency calibration is off by 100ppm, that can put the BFO on the other side of the 12mhz crystal filter.


On Thu, May 24, 2018 at 05:31 pm, kj6etl wrote:
I fired up the uBitx and connected it to an antenna and noticed that the stations are on the wrong sideband.

On 20 mts stations are only audible when I listen in LSB while this should be USB. I confirmed this with an other tranceiver that the stations I was listening to were indeed transmitting on the "correct sideband"

What to do?
uBitX CEC LSB / USB reversal #firmware #ubitx

 

I fired up the uBitx and connected it to an antenna and noticed that the stations are on the wrong sideband.

On 20 mts stations are only audible when I listen in LSB while this should be USB. I confirmed this with an other tranceiver that the stations I was listening to were indeed transmitting on the "correct sideband"

What to do?
Re: Raduino CAD Files

 

I don't have to configure any jumpers to program my Pills. It works just like programming the Nano. No need to access anything on the board. Just press the Arduino compile/upload button and you're off to the races

Joe
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