Date   

Re: HEX files with Mac OS

Bill Watkins
 

I've got raspberry pi and Mac, and I can't find anything that works for me.  There's Hex Loader, but it won't work for me.  There's avrdude, I think.  That's way, way, way above my head or the number of parameters I can possibly use to manipulate terminal.


Re: HEX files with Mac OS

Tom, wb6b
 

Here is an article explaining how to use avrdude to upload from a hex file on the Mac.

https://confluence.panio.info/display/PUBL/How+to+upload+a+precompiled+sketch+to+Arduino+UNO+via+command+line

Hope it helps.

Tom, wb6b


Re: NEXTION DISPLAY UPDATES For KD8CEC ver 1.094 up

Mark M
 

So the same .tft file works for both 3.2 and 3.2E?

Mark    AA7TA

On 7/6/18 2:29 PM, Joe wrote:
3.2 and 3.2E have the same size 3.2 display


Re: HEX files with Mac OS

Mark M
 

The only way I've been able to do it on a Mac is to compile the source in the Arduino IDE and load it from there. Unfortunately, I don't think he's released the source code for the 1.09x versions. I don't know of any Xloader type program for MacOS. If you find one, please let me know.

Mark AA7TA

On 7/6/18 9:14 PM, Bill Watkins wrote:
Can't find out how to load Hex files for Dr. Lee's 1.095 with my Mac. Anyone?


Re: Running on a Jump Box

Christopher Miller
 

Keep turning down the gain until the output is low enough your tuner will function.  Like I said in my original reply to you there are mods that will allow your output to be adjustable if you dont need your output to always be low.

Chris


HEX files with Mac OS

Bill Watkins
 

Can't find out how to load Hex files for Dr. Lee's 1.095 with my Mac.  Anyone?


Re: Crystal CW filter with Version 4 uBITX boards? #ubitx

ajparent1/KB1GMX <kb1gmx@...>
 

Jerry, I finally found that.

Doesn't say its tried.  The headers can make hookup easier if it doesn't.

I've answered why his losses are so bad.  I'm surprised its not worse.
I'll bet he hasn't checked for additional birdies as the intact 12mhz
filter can still pass stuff to the product detector.

Adding diplexers is awkward as the board does not allow. and they can
be lossy.  I'd not be surprised if the blow by was also degrading the filter.

Me I'd go with striping that part of the board and reusing them on a mezzanine
board with the needed switching for two filters. 

I keep thinking is wishes were ponies...

Allison


History of ubitx versions #ubitx

FC
 

I see that the ubitx is currently at version 4 and I'm trying to gauge how fast it's being revised and the reasons for it. Is there a list showing the date and changes or reason for each version?


Re: Crystal CW filter with Version 4 uBITX boards? #ubitx

ajparent1/KB1GMX <kb1gmx@...>
 

>>The idea of switching the IF frequency to switch filters appears to be sound<< 

Yes, it can IF you have a way to isolate the other filter that will
look like a RF short or reactive load at the off frequency.  That device
is called a diplexer.  In short 4 filters to isolate two crystal filters
based on frequency.

Its a bunch or caps and coils one path is high pass and the other is low pass.
Minimum isolation needs to be greater than 20db and 30db might be enough.
The problem is the loss will be about 1 to 3 db each diplexer and you need
one at each end (matched pair).  Each diplexer will need to be tuned and
the diplexers reactance is not correctly tuned may upset the filters shape
and loss.

I've done this for splitting one coax path for monoband antennas antennas
and multiple radios using one multiband antenna.  I've done this for HF
through microwave.  For an example I  have a few 2m/438 ones I've made
up for satellite work.

Have you ever tested a filter at the off frequency to see what its presenting?
EMRFD does discuss this and its why most high performance designs put
some form of isolation amp between the mixer and filter.  Reason the mixer
wants a 50 ohm broad band load and most filters are anything but that.

The assumption that the filter if not passing the signal is a open circuit is false.
Filters work by reflecting the signal or absorbing it.  After all the off frequency
signals have to go somewhere.  IF its reflecting it then presents a composite
impedance that is unfriendly.  If its absorbing then you've lost that signal anyway.
This is why simply paralleling filters is a busted idea.

Google High pass, low pass diplexer. 

You asked for knowledge and experience. I have that, if you don't like
the answer I can't help you.  Likely no one has had a V4 board long
enough to try it and based on a few decades of experience you are
doing what fails and hopefully understand why.  You can save them
pain.

Allison


Re: Completed my QCX #ubitx

Ralph Mowery
 

Pat here is some of what I measured when using a service monitor.

Voltage DC across C4.

4 volts was the maximum with -40 dbm input to the antenna connector.
3.9 V -50 dbm
1.8 V -60 dbm
.55 at -70
.1 V at -80 dbm
.03 at - 90 dbm

.4 V at -73 dbm which is 50 uV , the socalled s-9 signal .


Using the 2 line by 16 charicter display I adjusted the display so tht 50 uV shows up as 3 bars.
6 bars is -63 dbm. One + is -57 dbm and two ++ is -51 dbm.
That seems to make the meter show up for me using an off center fed dipole on 80 and 40 meters.

73 de ku4pt



On Fri, Jul 6, 2018 at 8:10 PM, pat griffin <patgriffin@...> wrote:

Ralph,

Can you tell what voltage levels you are seeing there? On a strong signal I see about .4VDC across C4 of the AGC circuit.

Thanks,

Pat AA4PG



From: BITX20@groups.io <BITX20@groups.io> on behalf of Ralph Mowery <rmowery42@...>
Sent: Thursday, July 5, 2018 9:20:55 PM
To: BITX20@groups.io
Subject: Re: [BITX20] Completed my QCX #ubitx
 
If you install the AGC kit you can just use it for the S-meter.  Just tap off the first pin where the several jumper pins are for the delay. Works fine.


On Thu, Jul 5, 2018 at 9:48 PM, WD8WV <juddie.d.burgess@...> wrote:
Pat,

I haven't built the S-Meter circuit yet.  I had it turned on but it really isn't doing anything, don't know why sometimes I see what appears to be signal since there is no circuit in it yet.  I have to order the LM358 chip, everything else I have.  I was going to do the circuit with the LM386, which I have 3 of those from where I was building Pixie kits.  I bought several and have 3 new ones left.  Dr Lee, KD8CEC texted me on his blog that it would be better to use the LM358 chip.  I just received in the mail the TX/RX pop fix kit and the AGC kit that I read about.  Of course I have never done SM soldering, so don't know if I will be able to do this.
--
Judd, WD8WV



Re: Crystal CW filter with Version 4 uBITX boards? #ubitx

Jerry Gaffke
 


At one time, Farhan was thinking two filters in parallel, a CW filter at 1.8432mhz.
https://groups.io/g/BITX20/message/36041

And if that doesn't work, headers would allow us to remove the current filter,
use pluggable filters.


On Fri, Jul 6, 2018 at 08:03 pm, Jim Sheldon wrote:
Then why did Ashhar Farhan even bother to add those headers and say it would work?  How about letting him explain his reasoning.  I'd rather not chop up the board to add relays or diode switches.  
 


Re: Crystal CW filter with Version 4 uBITX boards? #ubitx

ajparent1/KB1GMX <kb1gmx@...>
 

So you take off the parts and use the header as the connection points.
What is the big deal?  

There is not enough room on the board for a second filters or relays.

I can't find his saying it would work anywhere groups.io.  

Allison


Re: Crystal CW filter with Version 4 uBITX boards? #ubitx

ajparent1/KB1GMX <kb1gmx@...>
 

The third way is to put a higher selectivity filter in series with the wide one.
The added filter must be inside the pass band of the first. and you need
switching to get back to wide (SSB).  The problem with this scheme is
you incur the loss of two filters cascaded plus interface loss between them.
Most folks that do that insert a gain stage to isolate the filters from each other
and offset the losses of two filters.

The fourth way is two identical wide filters and a pair of mixers and two LOs.
The two filters are then used as a variable bandpass (analog) filter lots of
hardware and gain matching needed due to the mixers.  You get wide filter
and the offset overlap is a narrow filter depending on offset.  This also allows 
varying the IF center (Passband tuning) frequency without changing the BFO.
The bad part is the hardware to do that is nearly as complex as the radio.

Allison


Re: Crystal CW filter with Version 4 uBITX boards? #ubitx

Jim Sheldon
 

Then why did Ashhar Farhan even bother to add those headers and say it would work?  How about letting him explain his reasoning.  I'd rather not chop up the board to add relays or diode switches.  

Jim

On Jul 6, 2018, at 9:55 PM, ajparent1/KB1GMX <kb1gmx@...> wrote:

The filter is not lossy its shunted by a lossy termination, the other filter.

The other filter is NOT an open circuit at some other frequency its a highly reactive load.
as such it may be possible to build two diplexers to route Rf through based on frequency but
at HF a suitable diplexer with at least 30db isolation is going to have a few DB loss and
you need two the losses will be high and you will need to tune them.

Simple solution, relays.  Sophisticated solution, diode switches.  You remove the
existing filter and build it next to a second more selective one with switching to
use A or B. Dead bugging them on a strip of copper clad for a good ground
path and putting a SPDT relay at each end (or diode equivilent) will work
very well.  You will need to coordinate the switching with software to assure
the right BFO/LO2 combo.

Allison


Re: Crystal CW filter with Version 4 uBITX boards? #ubitx

ajparent1/KB1GMX <kb1gmx@...>
 

The filter is not lossy its shunted by a lossy termination, the other filter.

The other filter is NOT an open circuit at some other frequency its a highly reactive load.
as such it may be possible to build two diplexers to route Rf through based on frequency but
at HF a suitable diplexer with at least 30db isolation is going to have a few DB loss and
you need two the losses will be high and you will need to tune them.

Simple solution, relays.  Sophisticated solution, diode switches.  You remove the
existing filter and build it next to a second more selective one with switching to
use A or B. Dead bugging them on a strip of copper clad for a good ground
path and putting a SPDT relay at each end (or diode equivilent) will work
very well.  You will need to coordinate the switching with software to assure
the right BFO/LO2 combo.

Allison


Re: NEXTION DISPLAY UPDATES For KD8CEC ver 1.094 up

Richard Spohn
 

Thanks Mike and Joe and Ian and Allen! I continue to trawl Youtube
for more and more uBitx-Nextion videos, learning a lot! I do believe
an enanced Nextion is in my immediate future...!!! -- Rich WB2GXM

On 7/6/18, Joe <@ve1bwv> wrote:
Richard,

Ian, kd8cec is the big coder guru! Allen kn4ud and myself ve1bwv are
working the other things like screen support, testing and graphics
enhancements etc.

Kd8cec's 1.095 is not released yet.. I thought it was but it is incorrect
and version 1.094 is the current.

1. To load the radio code , use Xloader and load the hex file into the
radio via the usb. Ian has not released the Arduino .ino code yet
2. Load the .tft into the nextion as you described.
3. The ubitx manager is not required unless you wish to change some radio
parameter. The radio code v 1.094 supports nextion directly with no code
or ubitx manager changes required.
4. The Ubitx Manager program is very handy for changing many useful
parameters but not required. Programming function buttons, s-meter,
default startup freq etc etc

Joe
VE1BWV

On Fri, Jul 6, 2018 at 8:15 PM Richard Spohn <wb2gxm@...> wrote:

I am a bit late to the Nextion party....was kind of "ignoring" it
until yesterday when I went to the Nextion website. I've spent the
past 2 days watching youtube vids about the Nextion and about it and
the uBitx. Very excited...THANK YOU IAN AND JOE, hope I didn't miss
anyone! Now the question: I have a version-1 uBitx. Not modified in
any way. I get that you only need to plug 4 wires between the Nextion
and the Raduino, TX RX 5v and Gnd. I get that you need to load the
.tft file for the nx and the required size onto a SD card, make it the
only thing, put into the Nextion, power up and let it percolate, power
down, remove the card, pwr up and done. I kind of get that you have
to load the right .hex file into the raduino. Now...do I also have to
load "uBitx Manager" onto my PC and then make changes to the Raduino
through that? If there is a "step by step" guide going from the stock
uBitx to the Nextion 1.095, I have yet to find it, understandable
given all the work you guys are doing. Thanks again -- Rich WB2GXM






Re: Crystal CW filter with Version 4 uBITX boards? #ubitx

Bill Cromwell
 

Hi Jim,

My first question is in line with Alison's reply. Why not use 12 MHz xtals and keep it consistent? I have dome something similarin a couple of radios. But I got xtals to put the narrower filter on the same nominal frequency as the wider existing filter. Works a charm.

I am using narrow filters on the audio with my uBitx. The NEScaf works best for me. I really don't to make a $2500 radio out of it.

73,

Bill KU8H

On 07/06/2018 01:47 PM, Jim Sheldon wrote:
Has anyone successfully added a narrow crystal filter to the uBITX
version 4 boards using Ashhar's included header connections?

So far I've not been able to get a signal through filters at 4.6, 6.2
or 8 MHz. The filters use closely matched crystals, They are Chebychev
filters and have been designed with "ELSIE" for a 200 ohme input/output
impedance with 4:1 transformers to match them to Ashhar's specified 50
ohms. Software has also been modified to allow moving the BFO and IF
frequencies to match the filter's frequencies. Can't seem to get enough
signal through them to be useful though the software DOES put the IF
where it should be. I can hear a signal generator on whatever frequency
the uBITX is tuned to, but it takes better than 10 microvolts input at
the antenna for what I'd consider to be a usable CW signal in the
headphones.

I built the filter using a 4 crystal - 200 ohm 8 MHz circuit with
crystals and other components purchased from INRAD (Vibroplex now owns
them) but either I haven't figured out the proper 4:1 transformers or
there's just too much loss through the filter. I have tried it with 4
and 6 MHz filters I made from scratch with only slightly better results
(6 microvolts at the antenna for a usable signal)

Sure would be nice if someone was able to get something working to the
point it was usable and repeatable, even on perf-board.

The idea of switching the IF frequency to switch filters appears to be
sound - just need to find the magic crystal/capacitor/transformer
combination and for that I need someone with better knowledge of crystal
filters and better test equipment that I have.

Thanks

Jim Sheldon, W0EB
--
bark less - wag more


Re: Perfect pop and click fix for CW only operators

Alex KA3BQE
 

Which version of the ubitx? 


Re: Completed my QCX #ubitx

Russ KG0BK
 

That is one beautiful rig.
After all the work put in to it though . . . Just a (stupid?) question.
Why did you elect to go with the BNC antenna connector vs the SO-239?
You're using adapters to convert it to accept a PL-259.
Just curious.
Great job. . . . I want your case!
73 KG0BK


Re: ?- How high SWR before smoke? - 6146

Bill Cromwell
 

Hi Alison,
...Everybody,

I like to have a robust power supply. A homebrewed RF power amp with a 6146 suffered a fractured resistor that removed the grid bias. I heard the plate current meter hit the stop immediately followed by a crinkle sound from the tube and then the fuse blew. There was a melted place in the plate and the screen was *gone*. There was not even a little sigh from the power supply. Yes, tubes can be destroyed from those same things (even it takes more).

73,

Bill KU8H

On 07/06/2018 12:40 PM, ajparent1/KB1GMX wrote:
--snip---

High "SWR" rarely kills finals its often instability with reactive
loads. Overheating, over
voltage and over current can. Believe it or not those are the same
things that can kill
the venerable 6146!

Allison
--
bark less - wag more