Date   
Re: sketch dds-vfo by eZall for bitx40 #arduino #bitx40help #radiuno #smeter

Don, ND6T
 

Perhaps you are referring to the EZall.ino V1.0.6 by ND6T? In that case those circuits are all described at: http://www.nd6t.com/bitx
The S-meter works best if you install the AGC circuit.
73,
Don

Re: Save power supply voltage for uBitx V6

MVS Sarma
 

For those who use battery, even a full charged battery showing 13 V odd, will go down to 12 very soon in less than a minute.
As such 12V is preferred.
 The only advantage could be little more gain on the Linear output.
 but another components like LM386 and few rf transistors like bfw93 etc might work at the edge of limit.
Sarma vu3zmv


On Tue, Feb 18, 2020 at 10:43 PM Arv Evans <arvid.evans@...> wrote:
Yes.



On Tue, Feb 18, 2020, 3:57 AM Eugen Sibler <efsibler@...> wrote:
Dear all
What is the save power supply voltage for the uBitx V6: 12 Volt or 13.6 Volt?
Thanks for your help
Eugen / HB9MDU

Re: Portable antenna(s) #antennas #v6

Don Gamble
 

Some portable operators have used vertical or near vertical off center fed dipoles for 20m.  It does change the radiation angles but it brings the feed point closer to you shortening the coax needed.  

Good luck with your antenna system.

73 de Don KG5CMS.

On Tue, Feb 18, 2020, 11:06 AM Doug W <dougwilner@...> wrote:
lots of good information over at https://groups.io/g/antennas/topics
--
www.bitxmap.com

sketch dds-vfo by eZall for bitx40 #arduino #bitx40help #radiuno #smeter

SaMa photo SaMa photo
 

I uploaded the sketch by eZall version 1.6.0, it has the possibility of the S-meter, the swr etc ...
Does anyone have the blueprints for the construction of the S-meter circuit, swr etc .. ???
Thank you

Re: Save power supply voltage for uBitx V6

Arv Evans
 

Yes.



On Tue, Feb 18, 2020, 3:57 AM Eugen Sibler <efsibler@...> wrote:
Dear all
What is the save power supply voltage for the uBitx V6: 12 Volt or 13.6 Volt?
Thanks for your help
Eugen / HB9MDU

Re: Portable antenna(s) #antennas #v6

Doug W
 

lots of good information over at https://groups.io/g/antennas/topics
--
www.bitxmap.com

Re: The SAGA is COMPLETE!

Curt
 

Dan/Dean

my best effort to sort this out --

1. stock firmware has just ONE bfo calibration to make, because CW and SSB are the same 'mode selection.'  and its the same for LSB/USB because of the unique spectral flip in the RF chain

2. CEC firmware (I am not there yet ...) perhaps has more BFO calibration - because it has separate CW and SSB mode setting(?).  I need to ask Dan about how split works in CEC - he didn't need that in the contest, but I sure 'had fun' using split to work some of the same stations after the contest. 

73 Curt
just a few miles south of Dan BTW

Re: Made Mods to V3 uBitx - no longer transmitting #ubitx-help #v3

Steve - KE0VCD
 

Using a 9V battery and an Ohm meter, I've confirmed that the KT1-3 and K3 relays all function correctly.   

Re: Made Mods to V3 uBitx - no longer transmitting #ubitx-help #v3

Steve - KE0VCD
 

K3 values in XMIT
1   =   0V               16   =  0v
3   =   0                 14   =  0
5   =   0                 12   =  0
8   =   0                 9    =  12v

KT1 values in XMIT
1   =   0V               16   =  0v
3   =   0                 14   =  0
5   =   0                 12   =  0
8   =   0                 9    =  12v

KT2 values in XMIT
1   =   0V               16   =  0v
3   =   0                 14   =  0
5   =   0                 12   =  0
8   =   0                 9    =  12v

KT3 values in XMIT
1   =   0V               16   =  0v
3   =   0                 14   =  0
5   =   0                 12   =  0
8   =   0                 9    =  12v

Re: Made Mods to V3 uBitx - no longer transmitting #ubitx-help #v3

 

In the V3 schematic it is 8/9 !


At 18-02-20, you wrote:
According to the diagram in #76128, it appears that 1/16 control the  coil.
--
73
Dave
k0mbt
Raduino bracket and Ham_Made_Keys

Re: Made Mods to V3 uBitx - no longer transmitting #ubitx-help #v3

_Dave_ AD0B
 

According to the diagram in #76128, it appears that 1/16 control the  coil.
--
73
Dave
k0mbt
Raduino bracket and Ham_Made_Keys

Re: Made Mods to V3 uBitx - no longer transmitting #ubitx-help #v3

 

Correct!

At 18-02-20, you wrote:
Let me see if I understand, as I stated above, the pin numbers on the relays as viewed from BELOW are as follows:
8 9
5 12
3 14

1 16

Instead, the pins numbers are:
1 16
3 14
5 12
(<<<<<note the gap between the pins on the physical relays)
8 9

Correct? Do pins 8 and 9 control the switching mechanism?

Re: Portable antenna(s) #antennas #v6

N1EDC
 

With regards tonsoace considerations, if you are going with a 20m monoband the support system could be pretty simple.

My first portable antenna mast was a 20ft Shakespeare Wonderpole that can be had for not much over $20 and is very light.  You could support a sloper EFHW for 20m with that.  I often leave the top section collapsed (for greater rigidity) and set up a 40m EFHW in an inverted V with that very setup.

I also have a Jackite 33ft pole that could do a 20m EFHW as a straight vertical, but that is significantly more in cost, weight, and guying requirements.

Re: Made Mods to V3 uBitx - no longer transmitting #ubitx-help #v3

Steve - KE0VCD
 

Let me see if I understand, as I stated above, the pin numbers on the relays as viewed from BELOW are as follows:
8    9
5   12
3   14

1   16

Instead, the pins numbers are:
1    16
3   14
5   12
            (<<<<<note the gap between the pins on the physical relays)
8    9

Correct?   Do pins 8 and 9 control the switching mechanism? 

TSW Teensy 4.0 software with RTC coming soon #ubitx #v6

Jim Sheldon
 

To all users of TSW's Teensy4 to NANO adapter and those thinking about getting one, we have successfully gotten the T4's internal real time clock to display the time on the upper left of the screen. We still have a few refinements that we're working on so it isn't ready for prime time just yet.  Right now, you simply touch on the clock display and that brings up a manual setting window.  We hope to have an alternate, more accurate means of setting the clock in the future, such as an attached GPS module or grabbing your computer's time via the USB port.  Maybe even both, with the GPS being an option.  Possibilities here appear to be close to endless.

One of the drawbacks, we are still trying to find a 3V coin cell holder that can be mounted either on the Adapter or the Teensy 4 itself, connected to the Vbat (back up battery) terminal on the Teensy to keep the clock accurate while main power is off. Right now we're having to make up one that's connected by a set of wires and just hung off of it. Mounting it on the adapter or Teensy interferes with the regulator's heat sink on the factory Raduino AND the speaker on the top cover of the factory case.  Not an elegant solution but it is usable for the time being.

We've also added an A>B button that will transfer the frequency in VFO A to VFO B as the basis for easier setup of the SPLIT function. Screen shot shows how the screen looks in our "Beta" test (may change slightly in the coming release version)

We hope to be able to release a usable version within the next few days so watch for it on the website.

Jim Sheldon, W0EB,
TSW Project Coordinator

Re: Save power supply voltage for uBitx V6

Curt
 

Eugen

a commercial 13.8 volt supply should be fine - I was waiting for someone else to answer since I have a v4 -- but v6 should be same in this regard. 

the caution is to folk who try to make a power supply with a wall-wart - and get 18 volts instead of 12 or 14 volts into their receiver (and nearly 0 volts into their transmitter if the receiver survives!). 

enjoy your new rig - and I agree with your caution.  some folk insist on having a fuse in the path if they connect their uBITX to a 20-40 amp power source. 

73 curt
aka Curtis Eugene Milton wb8yyy

Re: Replace Si5351 and Raduino with Teensy4?

Jim Sheldon
 

Not only would frequency precision be an issue, but stability also.  They use micro miniature crystals on the Teensy 4.0 and also you would have to be able to generate 3 simultaneous and different clock frequencies.  The Si5351 does this well enough even with all it's warts. 

Jim - W0EB

------ Original Message ------
Sent: 2/18/2020 3:33:48 AM
Subject: [BITX20] Replace Si5351 and Raduino with Teensy4?

First, let me apologise if this is a stupid question - IANAEE and IANARFE (I am not an electrical engineer and I am not an RF engineer).

The new Teensy4 is a monster, running at 600 MHz. If I understand correctly, the Si5351 in the uBitx needs to produce a maximum of 75 MHz, which is done as a square wave.

Could you replace the Raduino and Si5351, with just a Teensy4, using the Teensy to generate the clock signal?
If so, would there be any value in doing it?

I'm guessing frequency precision might be an issue.

Thanks for a great forum.
Ben

Re: Save power supply voltage for uBitx V6

Dean Souleles
 

Hi Eugen,

It should work fine with either. I run mine off a 13.8V benchtop supply - along with the rest of my gear.  I have also used a 12V L-ion battery in the field.

73,

Dean
KK4DAS

Re: Made Mods to V3 uBitx - no longer transmitting #ubitx-help #v3

 

Dave,

Yes, I tried with smaller inductors and did not work at all. It has to be TDK shielded ones.
Changing KT1/2/3 to RF relays like Axicom does the same thing, prevents L5/7 from picking
up the TX signal and recycling it.

If everything worked the first time I would have lost interest in EE 50 years ago!

Raj


I once replaced the L5 and L7 inductors and my radio went to sleep. No matter how well you modify the circuit Raj, there is always someone (me) who doesn;t get it right. I think the values that I used were too small and attenuated the signal. I went ahead and replaced them with stock components and got it working again.

I have no doubt that you or I would have it purring along, Steve isn't there yet but may be gaining.
--
73
Dave
k0mbt
Raduino bracket and Ham_Made_Keys

Re: Portable antenna(s) #antennas #v6

Gordon Gibby
 

Aha!   As Allison i think has shown, RANDOM length end feds, with 9:1's perform terribly from a loss standpoint.
To each, their own.

Gordon



On Tue, Feb 18, 2020 at 6:14 AM Patrick Pelletier <ve9pax@...> wrote:
Hi,

I believe that antenna is an end fed random length wire antenna.  If it were an end fed half wave, the transformer would be a 49:1...

73

Patrick
VE9PAX

On Mon, Feb 17, 2020 at 10:36 PM Ken Hansen <ken@...> wrote:
+1 for EFHW if thTs an option.

I'm not a fan of that particular MFJ portable antenna - it's a series of compromises intended for a specific application, mounted on the back of a QRP Radio.

I'd suggest the 17 ft MFJ telescoping antenna, as well as The full-sized MFJ hamsticks, either one as vertical with a collection of ground radials cut to be resonant on the given band, or as a pair in a 'hamstick dipole' configuration.

Each of the above have 3/8" x 24 stud mounts.

If end-fed is an option, consider building the Hawaii EFHW described here:


They offer a kit, but construction is simple.

Ken, N2VIP

On Feb 17, 2020, at 12:27, KB9WOO <kb9woo@...> wrote:

New to the uBITX, kits, HF, and the group.

Looking for something small, easy, and quick just to get on the air so I'm looking at grabbing a MFJ-1820T single band antenna for 20m, which was designed for the FT-817.  This antenna needs a counterpoise and the 817 apparently has a ground screw on the chassis that the counterpoise is connected to.  I thought I'd just use a clip to attach it to the BNC elbow, or I might even use a small tripod instead.

Mostly just wondering if anyone has used one of these MFJ-18xx antennas with the BITX.  There is also the multi-band 1899t.

--
Mark, kb9woo
Milwaukee, WI uBITX v6