Date   
Re: Rugged Case Options? #ubitx

Mike Yancey
 

I like the box - seems a bit large - for us 'Muricans (and, of course, Liberia and Myanmar), 

80x220x195mm


Translates to 3.15" high, 8.7" (wide, I think), and 7.7" deep. It seems wider than deeper, so 8.7" wide.

I wonder if they the same style (which is great) but a tad smaller...

Mike Yancey, KM5Z

(waiting for notice; I ordered late)

Op Amp PCBs

Arvo W0VRA
 

Could be handy for experimenting...

http://www.ti.com/tool/DIYAMP-EVM

BITX QSO Afternoon/Night, Sunday, January 21, 3PM/7PM Local Time, 7277 kHz in North America, 7177 kHz elsewhere

John P
 

BITX QSO Afternoon/Evening, Sunday, January 14, 3PM & 7PM Local Time, 7277 kHz in North America, 7177 kHz elsewhere.

While not the greatest band conditions, the afternoon session last week was better than the evening session! So hopefully, we can try both times again this week.

Join us as we make contacts from BITX40 to BITX40 on 7.277 MHz in 40 meters!

This is a worldwide event for BITX40 stations starting at 7pm in each time zone. To participate, call CQ BITX on Sunday, starting at 3PM and/or 7PM your local time. The BITX QSO Night continues through the evening and conditions usually improve after sunset, so it is worthwhile to participate later in the evening.

Suggested Best Operating Practices:

Work at QRP power levels unless conditions require more power.
Call and listen for CQ BITX on the hour and every quarter hour.
It is helpful if you call CQ BITX with your callsign, name and location. 
Repeat your callsign a number of times during your CQ BITX and during QSO's.
Start a QSO by confirming the callsign, location, name and signal report of the other operator.
Say the callsign, name and location of the other operator so others can hear.
If the frequency is busy, avoid long conversations.
After your initial QSO is complete, ask if there are any other stations who would like to contact.

Report your QSO's, discuss propagation, noise, signal reports, audio reports, antenna type, etc. in this thread.

This is an undirected, scheduled event.  The BITX QSO Night relies on you to call CQ BITX to initiate contacts with other stations, so warm up that final and transmit a few calls on Sunday evening.  Talk to you then!
--
John - WA2FZW

Re: For anyone ordering in Canada, Import Taxes! #ubitx

ve3fdz@...
 

Hi no extra charge for me 
109 usd order Late December received mid January 

Re: S-Meter code help... #ubitx-help

Pavel Milanes Costa <pavelmc@...>
 

Hi to all.

I adapted an S-meter to the bitx40 code from Allard (outdated now) a few months ago, you can get the code here https://github.com/pavelmc/bitx40

Again, that is a out-dated version and for bitx40, not ubitx.

But you can get the idea.

A few hints from what I remember:

  • Yes, updating the LCD frequently can lead to RF noise.
  • So display is updated only if the mapping of the reading to the max of the smeter bar (not the reading it self) is different and only a few (3 or 4) times a second.
  • Avoid using delay() on the loop or elsewhere, search the list for a recent post from me about that subject to know more...
  • Don't update the ENTIRE s-meter bar, compute it, and then you will need only to draw or erase a few bars instead of redrawing it entirely.
  • That does a noticeable impact on the REDUCTION of the noise burst when writing to the LCD for the s-meter.
  • Now that you has a DIGITAL measurement of the S-meter the you can use it to control the AGC of the radio... I explored that idea in a early approach in a mod to that sketch... using a opto-coupler to vary the RF gain... today I have a few new ideas about it on my head....
  • You can then control the Attack time and the decay time in different ways, fast for CW, slow for SSB, etc...
  • The trick is to port that idea to hardware and test it; but I don't have a bitx or ubitx at hand to try/test anymore...  
I had implemented a S-meter in other of my projects (WARNING this project has actually a bug I'm chasing for in the rotary handling...)

https://github.com/pavelmc/arduino-arcs

73 Pavel, CO7WT.

El 18/01/18 a las 12:08, Sean W7SKD escribió:
Well...the issue is that the ubitx arduino program (and the bitx40 programs for that matter), were written with the expectation that you would only need to update the display if you changed frequency or went into the menus.  That made sense, because those programs only NEEDED to change what was displayed if there was a frequency change (or menu selection, as in the ubitx version).

Look in the 'loop' function in the ubitx code  - you might consider hacking in a function call to the display function you are using for your meter.  I haven't tried it, but it MAY increase noise as the display would then get updated constantly.  If that solves your problem, a more advanced approach would be to code in some logic that only updates the meter every fifth or tenth or twentieth (you get the idea) time through the loop, as it likely doesnt make sense to do it EVERY time through.

Hope this helps

Sean W7SKD

-- 
73 CO7WT, Pavel.

Audio Breakout Board #ubitx

Nick VK4PP
 

Hi All
I have created this for doing Audio Type mods: uBITX_Header_Breakout



AGC...
Mic Comp and Gain...

73

Re: Rugged Case Options? #ubitx

Clark Martin
 

Not yet but I do plan on posting some to Facebook.


Clark Martin
KK6ISP

On Jan 18, 2018, at 5:50 PM, Les Listwa <llistwa@...> wrote:

Clark
Do you have pictures of your ubitx in the Jameco enclousure?  How did you cut for the LCD opening?

73
Les
W2LPL

Re: Raduino v1.27.6 (few small improvements) released #bitx40

AA7GW
 

I have just gotten my BITX40 fully up to date for V 1.27.6 and have loaded that sketch.  All features work as advertised, and I even put in my Call Sign into the version I loaded, which also worked.  I implemented the Capacitive touch plates and that works as well.  But, I do have a few problems for which I would appreciate some insight.  I am an old EE/Systems Engineer with lots of analog/digital/software design experience, so I am able to implement and test pretty much everything coming down the pike.  I haven't branched out on my own yet, i.e., made major changes in either hardware or software, but I have lots of ideas, which is the point.  So here are my current issues:
1. Even with the volume turned way down (not related I guess), the CW side tone coming through my earphones (haven't installed speaker yet) is way too intense.  I implemented the 47/1k connection from the audio amp and Raduino D5, and I guess I can figure out how to attenuate that signal, but why? It is coming from the Raduino which should have a way to attenuate one way or the other, yes?
2. Receiver noise is horrible with no input from an antenna (50 ohm dummy load or just open).  I have implemented the LM386 suggested mod and another mod to better meet FCC requirements.  As I understand it, the BITX40 should be very quiet with no antenna input.  Perhaps one of the IF stages or the RF stage is not working properly?  I was listening tonight with my antenna hooked up and I certainly could hear CW (with noise) and also SSB QSOs going on, but the signal to noise ratio was terrible. Atmospheric conditions are probably not good especially at night, but my Yaesu HF rig was much quieter.  I also ran into what seems like a lot of birdies across the band (compensated drive for the one at 7.199)
Gary
AA7GW

Re: tx pop

Ryhor Harbacheuski
 

NP, Nick. You may want to play a bit with R and C values - Simon got
away with slightly lower values; you don't want have too much of
delay of TX->RX switching, just enough to kill the pop. On the other
hand, I noticed that if you stay TXing longer, then the pop may come
in a bit later, so be careful not to go too low with R and C values.
Greg/W3NW

Re: Rugged Case Options? #ubitx

Les Listwa <llistwa@...>
 

Clark
Do you have pictures of your ubitx in the Jameco enclousure?  How did you cut for the LCD opening?

73
Les
W2LPL

Re: Rugged Case Options? #ubitx

Les Listwa <llistwa@...>
 

Clark
Do you have pictures of your ubitx in the Jameco enclousure?  How did you cut for the LCD opening?

73
Les
W2LPL

Re: irf520 vs irf510

Tim Gorman
 

Yep, got it backwards. Emitter should be toward + and collector toward
the pot!

There should also be an emitter resistor and a resistor in the AGC lead
toward the controlled transistor.

I'll have to work on the actual layout when I have time.

tim ab0wr


On Thu, 18 Jan 2018 14:28:00 -0800
"Brian" <vk4bap@...> wrote:

"pot in the collector lead of the PNP transistor"

I assume you have the emitter and collector wrong in this diagram.

Brian VK4BAP

Re: Rugged Case Options? #ubitx

Roy Appleton
 

Do you happen to have the Fry's SKU number for the enclosure you used.

Thanks,
Roy
WA0YMH

On Jan 16, 2018 7:39 PM, "at91r40008" <yvon@...> wrote:
This is the same I bought from Fry's Electronics except the one I bought is black anodized.
Remember that you will have to insulate the tracks that runs on the of the PCB on one side.
The trace on one side is ground and the other side is a signal. I used kapton tape. 
I wish it would have been shorter and not so high. But it works and looks good.
--
73, Yvon NU6I

uBITX AM BCI Filter #ubitx

Nick VK4PP
 

HI All.
I have been working on something:

https://groups.io/g/BITX20/wiki/uBITX-AM-BCI-Filter

It will mount ontop of the board with tape and then tap into the RX chain. between K3 and the 30Mhz LPF...
Thoughts?

Re: Rugged Case Options? #ubitx

Dexter N Muir
 

I'd still consider my suggestion more decorative an *reliable*! No worries of tape damage or wear due to installation/removal or vibration, and no tape edge peeking around the board-edge.
73, Dex ZL2DEX

Re: Rugged Case Options? #ubitx

Clark Martin
 

I’m using the Jameco 208929 - 7.3 x 6.3 x 2.75.  Everything fits.

Clark Martin
KK6ISP

On Jan 18, 2018, at 1:21 PM, rsnow@... wrote:

Greetings, just pre-ordered my batch 2 uBITX last night when I discovered this neat device.  I'm already thinking of cases and I see that Jerry (KE7ER) is going with the Jameco CMC11949 (7.3 x 6.3 x 2.75).  I had already been looking at their cases and had come across these two as well:

SY0207
7.5 x 9.8 x 3.2
https://www.jameco.com/z/SY0207-R-Case-Metal-7-5-X9-8-X3-2-_209358.html
$19.98 from Amazon with Prime shipping (2-4week ship time, though)
$15.95 elsewhere (SH unknown)

SY0206 (Pretty tight)
6.3 x 7.75 x 2.5
https://www.jameco.com/z/SY0206-R-Metal-Case-6-3-x-7-75-x-2-5-_209350.html
$9.95 + $5 SH

Re: bitx40 firmware update killing the vfo

Allard PE1NWL
 

On Thu, Jan 18, 2018 at 01:47 pm, Richard E Neese wrote:
Is there a way to clear and reflash the units. ?
You could try to reload Farhan's original v1.01 sketch
https://github.com/afarhan/bitx40
However even the original sketch also looks at the red CAL wire, so I'm afraid it won't work either (at least not on unit 1). Perhaps unit2 will still work.

73 Allard PE1NWL

Re: For anyone ordering in Canada, Import Taxes! #ubitx

Diane Bruce
 

Some courier services (most?) use a broker service for all items coming in rather than dealing with it themselves. I knew about UPS and now DHL using a broker service. However apparently one can self-clear items according to: http://forums.redflagdeals.com/way-avoid-outrageous-ups-fedex-brokerage-fees-1175703/ (I hope links are ok here!) 

Re: bitx40 firmware update killing the vfo

Allard PE1NWL
 

The inputs can also become damaged by ESD (static discharge)

On Fri, January 19, 2018 00:34, Richard E Neese wrote:
as stated they have never been connected to any unit they where taken out
of the plastic case the kit came in and reflashed. that’s all they have
never touched a board or cables.
On Thu, Jan 18, 2018 at 18:21 Allard PE1NWL <@pe1nwl> wrote:

On Thu, Jan 18, 2018 at 02:56 pm, Richard E Neese wrote:

unit 1 in calibration loop
orange 4.34
red 0.36

unit 2 is settings look
orange 4.32
red 0.34

Both red and orange wires should have a voltage of almost 5V when they
are
left open.
It appears that your red wire has almost zero volts. This is a digital
"LOW", so the Raduino "thinks" that the CAL wire is shorted to ground
and
therefore it will go into calibration mode.

On unit 2, are you sure the colours are correct? Because I would expect
the values be exactly the other way around (when orange is LOW then the
Raduino thinks that the Function Button is pressed and will end up in
the
settings mode).

Anyway, as I mentioned, both wires should have a voltage of almost 5V,
not
almost zero.
Verify (with a magnifying glass) that there is really no short on the
Raduino board on those pins.
If you really can't find any shorts, then I'm afraid the inputs are
'fried'.
Beware that you can easily fry the inputs when loose wires are laying
around. When they accidentally touch something with a voltage higher
than
5V then they blow within a microsecond!
This already happened to many other builders (including myself) before.

73 Allard PE1NWL

Re: bitx40 firmware update killing the vfo

Richard E Neese <kb3vgw@...>
 

as stated they have never been connected to any unit they where taken out of the plastic case the kit came in and reflashed. that’s all they have never touched a board or cables.

On Thu, Jan 18, 2018 at 18:21 Allard PE1NWL <pe1nwl@...> wrote:
On Thu, Jan 18, 2018 at 02:56 pm, Richard E Neese wrote:
unit 1 in calibration loop
orange 4.34
red 0.36

unit 2 is settings look 
orange 4.32
red 0.34
Both red and orange wires should have a voltage of almost 5V when they are left open.
It appears that your red wire has almost zero volts. This is a digital "LOW", so the Raduino "thinks" that the CAL wire is shorted to ground and therefore it will go into calibration mode.

On unit 2, are you sure the colours are correct? Because I would expect the values be exactly the other way around (when orange is LOW then the Raduino thinks that the Function Button is pressed and will end up in the settings mode).

Anyway, as I mentioned, both wires should have a voltage of almost 5V, not almost zero.
Verify (with a magnifying glass) that there is really no short on the Raduino board on those pins.
If you really can't find any shorts, then I'm afraid the inputs are 'fried'.
Beware that you can easily fry the inputs when loose wires are laying around. When they accidentally touch something with a voltage higher than 5V then they blow within a microsecond!
This already happened to many other builders (including myself) before.

73 Allard PE1NWL