Date   
Re: show your mic

Tim Gorman
 

I used an old Motorola hand mic. I just packed the electret element
with a piece of acoustic foam in front and enough behind it to hold it
place with the back on. Works fine.

tim ab0wer

On Fri, 20 Apr 2018 10:54:32 -0700
"Nelson" <ngtdlt@...> wrote:

Sorry, I meant to show a picture of the front of the completed mic
also...

On Fri, Apr 20, 2018 at 10:46 AM, Nelson <ngtdlt@...> wrote:

I used an old Regency CB mic case, removed the old mic element, cut
down a small plastic funnel to fit where the original mic element
went and cut the other end of the funnel at appoint where a Radio
Shack electret mic element would just fit and hot glued the whole
mess together.

On Fri, Apr 20, 2018 at 8:50 AM, Roy Appleton
<twelveoclockhigh@...> wrote:

😱😱🤣🤣🤣

On Fri, Apr 20, 2018, 10:39 AM bobh_us <@bobolink> wrote:

My mic has its own processor


--
I always thought the Universe was a wonderfully strange place until
I studied Particle Physics - I now know the Universe is, in fact,
profoundly odd in nature


Delivered

Doug
 

uBITX ordered Feb 26, received via DHL today.  Can't wait to begin!

Re: show your mic

Rob Snow
 

Here is my mic housing, I printed it up to work with the supplied parts.  The element drops in to the hole, the button snaps into the side, the three posts have holes in them to wrap the wires for stress relief.  I've also got a back printed up, but I haven't put it on the live version yet.  This was the testbed print, I ended up moving the PTT up higher and to the other side because it didn't fall under any fingers in this spot.


uBitX with CAT control and Split operation?

Rag LB-Three-RE Stein-Roar
 

Hello

I am planning to buy/build a uBitX for dxped use.

But not sure about CAT control and VFO split ??!



Best Regards,
Stein-Roar Brobakken
@LB3RE
LB3RE K3RAG
Skype: lb3re.rag

Re: anybody tried softrock and hdsdr with Ubitx?

Paul Schumacher
 


Thanks Ashhar,

Paul


On Friday, April 20, 2018, 11:16:38 AM CDT, Ashhar Farhan <farhanbox@...> wrote:


There is am article in the swedish magazine, the QTC about using the rtl-sdr with ubitx.
- f

On Thu, 19 Apr 2018, 22:20 Paul Schumacher via Groups.Io, <wnpauls=yahoo.com@groups.io> wrote:
Has anyone tried a softrock and hdsdr with Ubitx to get the spectrum and
waterfall display?  (or something similar?)

If so, can you please describe how to go about doing it?

thanks,

Paul K0ZYV

Re: Transmitter Mods

Howard Fidel
 

That is to be determined based on the performance I get. Right now, I will adjust VR1 to get 5 watts on 40 meters and go from there.

Howard

On 4/19/2018 11:41 PM, Satish Chandorkar wrote:
How you propose to control the drive to be of 5 watts on all bands for your 70 W amplifier
As the uBITX is giving much more power out put on lower bands  than on the higher bands

Satish

Virus-free. www.avast.com

On Fri, Apr 20, 2018 at 5:07 AM, Howard Fidel <sonic1@...> wrote:
Actually, I would prefer to rewind the transformer with a center tap, and eliminate the chokes, feeding the DC to the center tap.
Z for L8, L9 should be >> then the output impedance which looks like the antenna impedance for the 1:1 transformer.
I am adding a 70 watt amplifier to my uBitx, so I just need 5 watts out on all bands to drive it. I doubt I will do much more, on the transmitter, but I will have to see how the amp behaves. I may to to better equalize the output level between the bands.

Howard




On 4/19/2018 2:37 PM, Jerry Gaffke via Groups.Io wrote:
The parallel resonance helps us to a point, though an ideal inductor would generally be better.
For example, if the inductor is self resonant at 14mhz, we'd see much more power out on 20m
than we see on 10m.  I'd prefer to keep gain vs freq somewhat controlled and predicatable.

The caps are easier to add, easier to obtain, have a higher self resonance:
    https://electronics.stackexchange.com/questions/193608/self-resonance-frequency-for-mlcc-capacitor
Maybe add 220pF caps across all six of the 22 ohm emitter resistors, and forget the inductor?
Then add a variable cap somewhere around Q90 that can be tweaked to give the flattest response,
that setting may vary given your particular 2n3904 transistor characteristics. 
 
But the inductor in series with the negative feedback is a good idea.
If this can all be done with just 3 extra components and get good enough results across
the different uBitx's out there, I'm fine with that.

One other issue:
As Henning notes in post 45035, the chokes L8 and L9 are best wound on a single core:
See the discussion below figure 4 on this webpage, where he discusses how the bifiliar
approach works, though he does not discuss the individual choke solution:
    http://ludens.cl/Electron/mosfetamps/amps.html
I was seeing significantly worse results in how the uBitx final worked compared
to the WA2EBY final in my LTSpice simulation, could be due to these chokes.
    https://groups.io/g/BITX20/topic/9615903
I may have to play with that further, not obvious to me how or if the individual chokes
at L8, L9 would impact the results..

Jerry, KE7ER


On Thu, Apr 19, 2018 at 11:00 am, Jerry Gaffke wrote:
Good question.
It's a parallel resonance:  
    https://www.everythingrf.com/community/what-is-self-resonant-frequency




Re: show your mic

Nelson
 

Sorry, I meant to show a picture of the front of the completed mic also...

On Fri, Apr 20, 2018 at 10:46 AM, Nelson <ngtdlt@...> wrote:
I used an old Regency CB mic case, removed the old mic element, cut down a small plastic funnel to fit where the original mic element went and cut the other end of the funnel at  appoint where a Radio Shack electret mic element would just fit and hot glued the whole mess together.

On Fri, Apr 20, 2018 at 8:50 AM, Roy Appleton <twelveoclockhigh@...> wrote:
😱😱🤣🤣🤣

On Fri, Apr 20, 2018, 10:39 AM bobh_us <rwhinric@...> wrote:
My mic has its own processor 




--
I always thought the Universe was a wonderfully strange place until I studied Particle Physics - I now know the Universe is, in fact, profoundly odd in nature




--
I always thought the Universe was a wonderfully strange place until I studied Particle Physics - I now know the Universe is, in fact, profoundly odd in nature

Re: show your mic

Nelson
 

I used an old Regency CB mic case, removed the old mic element, cut down a small plastic funnel to fit where the original mic element went and cut the other end of the funnel at  appoint where a Radio Shack electret mic element would just fit and hot glued the whole mess together.

On Fri, Apr 20, 2018 at 8:50 AM, Roy Appleton <twelveoclockhigh@...> wrote:
😱😱🤣🤣🤣

On Fri, Apr 20, 2018, 10:39 AM bobh_us <rwhinric@...> wrote:
My mic has its own processor 




--
I always thought the Universe was a wonderfully strange place until I studied Particle Physics - I now know the Universe is, in fact, profoundly odd in nature

Re: uBITX #933/2 Finally quite satisfied with operaton #ubitx

Jim Sheldon
 

Accidentally included the same picture twice - here's the one I intended to post showing the real time clock & voltage monitor on the screen -- that V308b is a beta version of software and even though it was compiled on 04/01, it isn't an April Fool's Day joke.

Jim - W0EB

Re: UBITX QUERY

Arv Evans
 

Norm. Vk5gi

Probably no mike gain control because the audio input is designed for
approximately 45 millivolts level and the included electret microphone
puts out approximately 45 millivolts. 
Secondary reason is that it avoids possibility of cranking the gain up
too high, overdriving the balanced modulator and causing unwanted
emission products.

Arv  K7HKL
_._


On Fri, Apr 20, 2018 at 2:17 AM, marjannorm <marjannorm@...> wrote:
Daft question gang, but how come the ubitx hasn't got a mic gain control?
Norm. Vk5gi
McLaren Vale
South Australia


Re: anybody tried softrock and hdsdr with Ubitx?

Ashhar Farhan
 

There is am article in the swedish magazine, the QTC about using the rtl-sdr with ubitx.
- f

On Thu, 19 Apr 2018, 22:20 Paul Schumacher via Groups.Io, <wnpauls=yahoo.com@groups.io> wrote:
Has anyone tried a softrock and hdsdr with Ubitx to get the spectrum and
waterfall display?  (or something similar?)

If so, can you please describe how to go about doing it?

thanks,

Paul K0ZYV

Re: show your mic

Roy Appleton
 

😱😱🤣🤣🤣


On Fri, Apr 20, 2018, 10:39 AM bobh_us <rwhinric@...> wrote:
My mic has its own processor 

Re: show your mic

bobolink
 

My mic has its own processor 

uBITX #933/2 Finally quite satisfied with operaton #ubitx

Jim Sheldon
 

Finally have this one where it will get it's top cover put on and the radio goes into the "go box".  With the addition of one of our RadI2Cino cards, an I2C 4 line by 20 character display, a Teensy 3.6 adapted to plug in place of the NANO, this one is on the air in what will be it's final configuration except for software updates when we release them.  (External USB connector in place so the cover need not be removed for remote control or Teensy 3.6 programming. One nice thing about using the Teensy is the built-in Real Time Clock!  UTC time displayed on the screen and with a backup coin cell battery, the clock stays active even when no +12V is applied to the radio.Also, I added Don, ND6T's neat little AGC mod and boy does that work nicely. 

Here are a few pix of the radio as it now stands.

Jim Sheldon, W0EB

Re: Transmit indicator light.

Gary Anderson
 

Max,
Here are the direct links to the images showing TX/RX LED wire-up for Sunil's (VU3SUA) enclosure.

3 wires soldered to PCB:
https://i1.wp.com/amateurradiokits.in/wp-content/uploads/2018/03/Led-12-Volts-for-RX-And-TX-from-TX-TR-Relay-2.jpg?ssl=1

Proto board connected to LED with series resistors:
https://i1.wp.com/amateurradiokits.in/wp-content/uploads/2018/03/Mounting-Led-TX-RX.jpg?ssl=1

If this doesn't work for you, I can include the images in an email to the address shown on your funwithtubes site.

Regards,
Gary
AG5TX

Re: show your mic

Jack, W8TEE
 

So you're the guy who read that QRP Quarterly article!

Jack, W8TEE


On Friday, April 20, 2018, 10:03:59 AM EDT, Tom Christian <tmchristian@...> wrote:


Gee.... I wonder who gave me the idea for my mic?? :) 
Thanks, Jack!
Tom
AB7WT

Re: Coast to coast on my ubitx yesterday

Tim Gorman
 

You were getting 25 watts Peak-to-Peak? Or you were getting 25 volts
peak-to-peak?

tim ab0wr

On Fri, 20 Apr 2018 05:00:23 -0700
davesters@... wrote:

I wasn't really trying but this is still only the 4th day that I have
had my ubitx. Using phone I was able to work stations from coast to
coast of the united states. I did it on the 80 meter band. and used a
homemade trap 80/40 dipole. My radio could put about 25 watts pp. My
power source is a 10 amp linear 13.8v Tripp-Lite. Logged stations in
Maryland, Florida, NY,Montana, Utah, California and states in
between. Most gave me signal reports of 5/4 to 5/9 I got a couple of
4s and a 3/3 I got a 2/1 when working a Missouri station, I am in
Missouri. The longest contact was 1500 miles in Northern California.

I am using the stock electret microphone.

Have also done some CQ ing on 7277. I did find two Hams with bitx
radios One that had his radio out of the box but had not put it
together. The other was N3GO Gary in Raleigh NC, He had a bitx40 that
was modified. I talked to him on both my ubitx and my bitx40. He said
that there was not much difference in signal. I definitely hear
better on the ubitx.  

Dave 
K0MBT

Re: show your mic

Tom Christian
 

Gee.... I wonder who gave me the idea for my mic?? :) 
Thanks, Jack!
Tom
AB7WT

Re: UbitX I2C GPIO Breakouts?

Tim Gorman
 

Unless the display is changed by one of the other tasks there is no
reason to update the display. It's not like you are preventing the
other tasks from running while you automatically update the display on
a regular basis. The speed of sending display updates via I2C really
isn't that much slower than doing it direct. In essence, the I2C
backpack on the display is just another co-processor that offloads
controlling the display from the main processor.

I can't argue with the fact that multiple processors provide more
computing power. However, as you point out, all those processors have to
communicate with at least the main processor which, in turn, slows down
the main control processor while it is communicating.

You might cast an ADC unit that communicates with the main processor
over I2C on an as-requested basis as a co-processor. The main processor
isn't required to actually process the voltage on an analog pin, the
ADC does that. The main processor just gets the result of the read of
the analog value, it doesn't have to actually read the analog value
first before it processes it.

tim ab0wr





On Thu, 19 Apr 2018 21:36:27 -0700
"NNicholas via Groups.Io" <NNicholas=aol.com@groups.io> wrote:

No, it's not a big difference in speed, that is until you consider
that the display in this radio isn't the Arduinos only task. I
haven't started on this all just yet, but from previous projects.  In
the past ,  ive found cop-rocessing with multiple prcoessors on an
I2C bus to not only offer greatly improved speed up of operations,
over all; it makes dividing up the project a bit easier too. The only
challenge, that I ever found in multiple processors , is at start up,
where you want to make sure that all the processors are talking
before entering into each of their program loops . It's not that hard
to code and you can find plenty of examples on how to do this.

Re: show your mic

Jack, W8TEE
 

Mine with a stock electret:
Inline image
Made from some plumbing parts, phone extension wire, some too-big-for-anything-useful shrink tubing, and hot glue. Total cost: $0.87. Guess who has the greater building skills, Joel or me. Hint: Joel.

Jack, W8TEE

On Friday, April 20, 2018, 9:42:44 AM EDT, Joel Caulkins <caulktel@...> wrote:


Here is one of mine made in a aluminum pen tube with PTT inside.

Joel
N6ALT