Date   
Re: Bitx-40 net? #bitx40

Wayne Leake
 

 I would answer if I were on and heard you clear enough.
 Except for contests.
 I am not into contests, though I was into WAS for a while.
 I did work some 6 SSB for a while after I moved here.
Antenna for 6 is a Hamstick on a heavy magnet mount, sitting on a corrugated metal roof.
 and is at aprox 50 degrees off vertical.or better yet,
 hoping to get a 40 meter dipole or inverted V set up to use with one BITX40.a bit of ragchew.
 Always enjoy a chat,
 Wayne WA2YNE

Re: Bitx-40 net? #bitx40

_Dave_ K0MBT
 

I managed 6 field day contacts working a couple of hours over two days. Running ubitxv3. All on 40 meters. I don't make time for contests more than short time working and I get bored.

Just a few minutes ago I heard ws4jm on 7.277 and returned but apparently he didn't hear me.

73
Dave
k0mbt

Re: Bitx-40 net? #bitx40

_Dave_ K0MBT
 

Just looked a my wife's log book N0BEX. She managed 12 digital contacts with her v3 ubitx.. We worked alternately over a 4 hour period.

Re: #v5 finally got my V5 together and working, PA bias question #v5 #ubitx #pabias

 

Hi Dennis,

The manufacturer has a page for setting the PA bias; I would go by that recommendation for sure:

ubitx tuneup

The instructions call for 100mA above background current requirement for each PA transistor.  This is set by triggering the PTT with no mic input, then adjusting each PA transistor's bias pot.  In the end, with no voice input, your rig should consume about 0.7A

Once that is set, giving a loud "helloooooo" will increase consumption significantly, depending on the chosen band also.

73,


Mark.

Re: Bitx-40 net? #bitx40

Christopher Miller
 

I worked a commercial 100 watt rig last night for several hours. I made maybe 20 contacts. Granted it was 20 and night time, but with several grand worth of equipment I didn’t do any better.

KF4FTR

Re: V4 Raduino

Dennis Yancey
 

uBitx v4. It will work on any ubitx but is the redesigned with the replaceable Nano. 
--
72 and God bless
KD4EPG

Re: V4 Raduino

Dennis Yancey
 

I am sure one could modify it to match up to the Bit40

--
72 and God bless
KD4EPG

Re: Bitx-40 net? #bitx40

Martin Potter
 

I know what you mean. I tried for the 40 m net this evening (7277 kHz at 0000 UTC) and heard a couple of fellows, but very weakly. Less than 30% copy at my QTH. I think one was a W4 and I think I heard phonetics for "IH" but am not sure. I called several times but no one heard me. I think they might have moved to 7275 after a few minutes, due to QRM.

I have had one remarkable DX QSO, sideband, with a special event station in Madrid on 40 m. My antenna is an inverted-V for 40 m with apex at about 40 feet.

For QRP work, CW is the way to go. It gets through where voice can not. Don't give up.
73,
... Martin VE3OAT

Re: My first measurements with relay daughterboard

Mark Hatch
 

If there is anybody thinking of ordering some boards I am in. Haven't done this before or would have ordered a set (how do I figure out number of layer and physical size, number of layers and board thickness from the Gerber files?)

73
Mark
AJ6CU

Re: Bitx-40 net? #bitx40

Robert D. Bowers
 

Thanks!  I can't do CW, due to strange neurological issues (I can copy 20 wpm one minute, then can't copy 5 for the next hour... unpredictable and definitely medical).  I could set up a computer interface and do (for example) PSK31, but want to keep the radio simple as possible.  As it is, I have the radio, an external DSP noise filter, battery, and cabling in a tool box, with room for a lightweight 40m antenna.  Easy to grab and run in a situation.

Thanks for the tip about the 7.277 net.  I knew 7.277 was one of the frequencies, but have never heard anything except bleed from 7.275.  0000utc... I'll set a reminder popup.

On 6/23/19 9:14 PM, Martin Potter wrote:
I know what you mean. I tried for the 40 m net this evening (7277 kHz at 0000 UTC) and heard a couple of fellows, but very weakly. Less than 30% copy at my QTH. I think one was a W4 and I think I heard phonetics for "IH" but am not sure. I called several times but no one heard me. I think they might have moved to 7275 after a few minutes, due to QRM.

I have had one remarkable DX QSO, sideband, with a special event station in Madrid on 40 m. My antenna is an inverted-V for 40 m with apex at about 40 feet.

For QRP work, CW is the way to go. It gets through where voice can not. Don't give up.
73,
... Martin VE3OAT


trick to soldering in L5 and L7 or why did spurs on 80/40 get worse and 20/10 get better...

Mark Hatch
 

Hi all, could use some pointers here on replacing L5/L7 on a V4 board. Not having a real spectrum scope, i am using the sdrplay with their spectrum scope software... Was using a RF sampler + 110db attn (HP 355d)

I got the following results...

                     Spur                Spur                                      Fundamental
Band .          Before             After replacement l5/l7 .        Before              After
80 .               -34db             -28db                                      -57db             -65db
40                 -19db             -13.5db                                   -65db             -70db
20                 -28db             -33db                                      -60db            -61db
10                 -32db             -40db                                      -65db             -63db

Looks like the main culprit is a decrease in output of the fundamental on 80 and 40 of 8db and 6db respectively.

So I am wondering...
1. Measurement error? (does the transceiver need to warm up for 30 minutes or more?)
2. Wrong part for L5/L7? Mine are orange, with markings of "A" and "T" and R68K 1145
3. One of the solder joints is poor
4. Inductor damaged during solderin g

?

Does the fact that 80/40 output reduced point the finger at either L5 or L7? 

How did you bridge that gap, especially for L7. That seems to be a likely target for a cold solder joint.

Appreciate any thoughts and experiences here!

73
Mark
AJ6CU 

Re: trick to soldering in L5 and L7 or why did spurs on 80/40 get worse and 20/10 get better...

 

For 40/80 spurs you need to change the 3 filter relays to AXICOM.

L7/5 improves the higher bands in my experiments.

L5/7 should have equal effect on all bands as it is an IF stage and all bands will be same unless you are over driving
the PA.

Power loss noted by me is minimal with yellow inductors, with other SMD inductors there was severe opwer loss.

Raj


At 24-06-19, you wrote:
Hi all, could use some pointers here on replacing L5/L7 on a V4 board. Not having a real spectrum scope, i am using the sdrplay with their spectrum scope software... Was using a RF sampler + 110db attn (HP 355d)

I got the following results...

                     Spur                Spur                                      Fundamental
Band .          Before             After replacement l5/l7 .        Before              After
80 .               -34db             -28db                                      -57db             -65db
40                 -19db             -13.5db                                   -65db             -70db
20                 -28db             -33db                                      -60db            -61db
10                 -32db             -40db                                      -65db             -63db

Looks like the main culprit is a decrease in output of the fundamental on 80 and 40 of 8db and 6db respectively.

So I am wondering...
1. Measurement error? (does the transceiver need to warm up for 30 minutes or more?)
2. Wrong part for L5/L7? Mine are orange, with markings of "A" and "T" and R68K 1145
3. One of the solder joints is poor
4. Inductor damaged during solderin g

?

Does the fact that 80/40 output reduced point the finger at either L5 or L7? 

How did you bridge that gap, especially for L7. That seems to be a likely target for a cold solder joint.

Appreciate any thoughts and experiences here!

73
Mark
AJ6CU 

Re: Bitx-40 net? #bitx40

Vic WA4THR
 

Try one of the CARS nets on 40m during the mornings. SouthCARS is on 7251, EastCARS is on 7255, and MidCARS is on 7258, all running at least from 8-12 every day. The NCS stations listen for mobiles and QRP stations and are located in various areas, changing every hour, so the chance of connecting with one or being heard by a relay station is pretty good. I've even checked in to these running my BitX40 mobile with good results. Remember that many of the NCSs run power as a help to mobiles, so if they don't hear you well, don't be discouraged, but they do try.

=Vic=

Re: My first measurements with relay daughterboard

Gordon Gibby
 

It’s a two layer board (top and bottom), I’ll send the dimensions later on,  screen printed, and just take the default settings for pretty much everything else.   You’re only putting about $25 at risk. ( Unless the tariffs have changed it ) and you get 5-10 boards!  




On Jun 23, 2019, at 22:36, Mark Hatch <mark2382@...> wrote:

If there is anybody thinking of ordering some boards I am in. Haven't done this before or would have ordered a set (how do I figure out number of layer and physical size, number of layers and board thickness from the Gerber files?)

73
Mark
AJ6CU

Re: Bitx-40 net? #bitx40

Gordon Gibby
 

You guys have got to try FT8!!!!!!!
You will definitely get answers there. Then learn how to do JS8 which is conversational

This rig is perfect for it


On Jun 24, 2019, at 05:06, Vic WA4THR via Groups.Io <vhklein@...> wrote:

Try one of the CARS nets on 40m during the mornings. SouthCARS is on 7251, EastCARS is on 7255, and MidCARS is on 7258, all running at least from 8-12 every day. The NCS stations listen for mobiles and QRP stations and are located in various areas, changing every hour, so the chance of connecting with one or being heard by a relay station is pretty good. I've even checked in to these running my BitX40 mobile with good results. Remember that many of the NCSs run power as a help to mobiles, so if they don't hear you well, don't be discouraged, but they do try.

=Vic=

Re: Bitx-40 net? #bitx40

Jay - WS4JM
 

I try to be there every Sunday evening from around 0:00 to 01:00 UTC on 7.277. I heard some very weak stations but not strong enough to copy. Hopefully propagation will improve, I'll try again next Sunday evening, hope to catch you then.

73 de WS4JM
Jay

Re: Beta 1: Nextion files for 5", 7" and 9" screens for CEC software

Andrew
 

This looks great! 
Thanks,
Andrew
K1YMI

On Sun, Jun 23, 2019, 14:27 Mark Hatch <mark2382@...> wrote:

Hi all,

Happy to announce that I have completed what i consider "beta 1" for the 5" version of the CEC user interface. Note this user interface is substantially different than the original one released by KD8CEC (see screenshots below). It has been optimized for 800x480 screens and is probably not easily migrated to smaller ones (sorry), But if you are a lucky ham with either a 7" or 9" Nextion, should be a simple matter of opening the ".hmi" file up in the Nextion editor, change the Device settings to match your screen, and compile it to create a tft file. I would also like to acknowledge the original work done by Joe Puma (KD2NFC), without his headstart, i would probably have not been able to complete this.

The files (both .tft and .hmi are in the files section for this group.: Files/AJ6CU Nextion 5-inch files/Nextion5inch June 23, 2019-Beta1/

The following screenshots show some of the new GUI.

MAIN MENU
The main change here was to Group the various functions in to "Applications", "Settings" and "Expert". I did some renaming so that it was clear on the function. Also, Factory Recovery now has its own screen that clarifies what is happening (for dummies like me...). And there is an "About" screen...



ABOUT SCREEN
Every applications should have its own About screen. :-) . Note that in addition to credits and version, there is a list of the 3 known problems.



Save/Recall from Memory
Ok, probably didn't have to redo this one, nothing really wrong about the way it was done. But I added a popup virtual keyboard for adding a label/tag to a memory location. And I also made sure that the Current VFO setting was kept update. That allows you to turn around on your VFO while the Store to Memory is onscreen and you can save it whenever you find something interesting.




BANDSCAN
The Bandscan as originally designed had a number of problems including only able to look at signals 2k at a time and a maximum bandwidth of ~250kHz. This meant that if you scanned 80m, you only got the bottom half of the band. I personally didn't like the way bands were pre-selected, i preferred that the user could select any three in any order. I also added several missing bands.  (For folks outside of USA FCC, it is easy to change these bands from within the .HMI file. Let me know if you would like to do this and I will provide details.) . There are still some room for improvements here. I might experiment with a smaller frequency step and smaller scan bandwidth. But that would be a future effort... 

The first photo below shows the popup selection of offsets from the beginning of the band (I used a mechanism similar to how the mode CWL/USB, etc is selected on the front page). The second photo 
shows a completed band scan that gets to the top of the 3 selected bands. 



CW Decoder
Made some minor GUI changes and renamed this to reflect its functionality. Added a slider switch on left to select between Signal analysis and CW decode.


 

Factory Recovery
Previously, pushing Factory Recovery required you to press it 3 times to run Factory Recovery. But there was no explanation of what it did and why you probably did not want to do it. I added a separate screen with explanation and double confirmation.



Main Menu

Just added direct access to Store/Record to Memory (see upper right). Also liked this spectrum I captured on Field Day. :-) 



My Setup
Not sure anybody cares, but I ran both a 5" and a 3.2" display simultaneously (thanks Ian!) during development. This allowed me to quick answer the question: "What did Ian originally attend for this screen to do?"  It was very helpful and I recommend this to anybody else that is doing development for Nextion.



That's all for now!
73
Mark
AJ6CU

Re: Bitx-40 net? #bitx40

Don - KM4UDX
 

Our local club (Vienna Wireless Society, in Vienna Va) has various nets almost every night in phone, digital, and CW). My humble v4 works well with all of them. But, getting a "SSB qso in the wild" is a rare bird. While listening to a contest, some island was calling CQ, and on a whim I answered, and I was floored when they came back to me.  It was the first non-net qso.  I was freaked and actually jumped for joy. (Getting out of the seat is good anyway, hahah).  

The CARS idea is a good one.  That also worked for me.  I also stumbled once upon a Michigan net of retired automotive assembly folks. They heard me just fine.  Participating in nets is a great way to go.  Google the nearest radio club, find their nets, and give it a go.

lastly, while you want to keep the rig simple, just try hooking it up to any old laptop with fldigi.  Just hook the laptop speaker out to the uBitx mic Jack, and uBitx audio out to into laptop mic.  The world will open up.  Totally.  Digital modes (stupid name, they should just say "typing" or "text" modes) are wicked effective for our little uBITX rigs. If you just try PSK31 on 7070, and assuming you like to text chat, you will have a blast.  

Let us us know how it goes. 

Don
km4udx

Re: Bitx-40 net? #bitx40

Ted
 

Why, sure!! My computer logging contacts with other computers while I goof off or work.  The PC does seem bored and in need of a hobby. 

 




-Ted

Britx 40 Raduino Help

mtngentleman@...
 

i am attempting to assemble a Britx 40.

Instructions call for "connect a 5 pin connector to the bottom side of the Raduino"

There is none on the board.

Do I have the wrong board or is there a work around? (picture)

Any help appreciated

AA7MH