Date   
Re: show your mic

 

Nice one Farhan, looks like a 300/75 TV balun.

Raj


At 20/04/2018, you wrote:
What do you know! Mine is uglier than yours.Â


On Thu, 19 Apr 2018, 22:53 Bill KC5SB, <blmerideth@...> wrote:
Here's mine.  I made it from an old 9 volt flashlight.

UBITX QUERY

marjannorm
 

Daft question gang, but how come the ubitx hasn't got a mic gain control?
Norm. Vk5gi
McLaren Vale
South Australia

Re: show your mic

Ashhar Farhan
 

That's right, george. 


On Fri, 20 Apr 2018, 11:42 Raj vu2zap, <rajendrakumargg@...> wrote:
Nice one Farhan, looks like a 300/75 TV balun.

Raj

At 20/04/2018, you wrote:
What do you know! Mine is uglier than yours.Ā


On Thu, 19 Apr 2018, 22:53 Bill KC5SB, <blmerideth@...> wrote:
Here's mine.Ā  I made it from an old 9 volt flashlight.

BITX QSO Afternoon/Evening, Sunday, April 22, 3PM & 7PM Local Time, 7277 kHz in North America, 7177 kHz elsewhere.

John P
 

BITX QSO Afternoon/Evening, Sunday, April 22, 3PM & 7PM Local Time, 7277 kHz in North America, 7177 kHz elsewhere.

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

Coast to coast on my ubitx yesterday

_Dave_ K0MBT
 

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: UBITX QUERY

_Dave_ K0MBT
 

Hello Norm.
Mine needs every bit of mic gain I can't think of any instance where less would be better.  Is yours too loud or do you have distortion?

I have one of those mic pre amps and compressor boards (about half the size ofa postage stamp) I want to make a separate mic to try it out. It has optional compression and mic gain settings.

Re: UBITX QUERY - Mic gain control

 

Mic gain control:

Remove R62 and R63

Add a 1K preset or Pot .. extreme end connections to PIN 2 - emitter of Q6 and ground.
Connect the center pin to + of C62.

If the gain is increasing in the wrong direction interchange the ends of the preset/pot.
An antilog pot should be smoother in control.

Raj

At 20/04/2018, you wrote:
Daft question gang, but how come the ubitx hasn't got a mic gain control?
Norm. Vk5gi
McLaren Vale
South Australia

Re: UBITX QUERY - Mic gain control

MVS Sarma
 

Raj jee,
Perhaps we need additional gain so that control can work , say 1 or 2 dB on either side.


Regards
MVS Sarma
 

On Fri, Apr 20, 2018 at 6:08 PM, Raj vu2zap <rajendrakumargg@...> wrote:
Mic gain control:

Remove R62 and R63

Add a 1K preset or Pot .. extreme end connections to PIN 2 - emitter of Q6 and ground.
Connect the center pin to + of C62.

If the gain is increasing in the wrong direction interchange the ends of the preset/pot.
An antilog pot should be smoother in control.

Raj

At 20/04/2018, you wrote:
>Daft question gang, but how come the ubitx hasn't got a mic gain control?
>Norm. Vk5gi
>McLaren Vale
>South Australia





Re: BITX QSO Afternoon/Evening, Sunday, April 22, 3PM & 7PM Local Time, 7277 kHz in North America, 7177 kHz elsewhere.

John 2e0eii
 

I would love to compete but I don't think UK stations ,can tx over 7.200. rgds John 2e0eii

On 20 Apr 2018 12:34 p.m., John P <j.m.price@...> wrote:
BITX QSO Afternoon/Evening, Sunday, April 22, 3PM & 7PM Local Time, 7277 kHz in North America, 7177 kHz elsewhere.

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: BITX QSO Afternoon/Evening, Sunday, April 22, 3PM & 7PM Local Time, 7277 kHz in North America, 7177 kHz elsewhere.

Doug W
 

I would love to compete but I don't think UK stations ,can tx over 7.200. rgds John 2e0eii


7277 kHz in North America, 7177 kHz elsewhere.

Re: receiver overload

Tim Gorman
 

Usually a tuner will increase noise, at least atmospheric noise, as the
tuner creates a match between the receiver and the antenna. A matched
antenna shouldn't "tame" the noise. If that is actually happening then
a closer look at the system might be appropriate.

tim ab0wr



On Fri, 20 Apr 2018 11:39:39 +1000
"John Sharpe" <johsharpe@...> wrote:

Hi all,

I just had a thought about new users of the uBitx and the Bitx40.

I have both of these fine rigs but with my good antenna - a ZS6BKW
<http://www.nc4fb.org/wordpress/zs6bkw-multi-band-antenna/> at 30
feet - the receivers are swamped by noise and big signals on 40
metres.

When I tested just now a 59+ 10 signal on my IC-7300 was unreadable
on the Bitexes with the big antenna (which has a low SWR at 40
metres) because of noise. With an antenna of just 6 feet of wire in
the shack the signal was readable (but weak) on the Bitexes!

I usually use a tuner beween the antenna and the Bitexes - that works
fine to tame the noise. Also I have fitted an RF control to the
Bitx40 that helps quieten big signals.

But if you have lots of noise in the receiver and no tuner - try a
smaller antenna on receive (it will be no good for transmitting). If
that improves things maybe you need a tuner or an RF control.

73s John V2VOL

Re: show your mic

 

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

Joel
N6ALT

Re: receiver overload

K9HZ <bill@...>
 

Unless the antenna is picking up a static charge and the antenna tuner is
acting like an impedance to ground draining that charge off. Don't laugh,
it happens.


Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ

Owner - Operator
Big Signal Ranch – K9ZC
Staunton, Illinois

Owner – Operator
Villa Grand Piton – J68HZ
Soufriere, St. Lucia W.I.
Rent it: www.VillaGrandPiton.com
Like us on Facebook!

Moderator – North American QRO Group at Groups.IO.

email:  @Doc_Bill

-----Original Message-----
From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Tim Gorman
Sent: Friday, April 20, 2018 8:42 AM
To: BITX20@groups.io
Subject: Re: [BITX20] receiver overload

Usually a tuner will increase noise, at least atmospheric noise, as the
tuner creates a match between the receiver and the antenna. A matched
antenna shouldn't "tame" the noise. If that is actually happening then a
closer look at the system might be appropriate.

tim ab0wr



On Fri, 20 Apr 2018 11:39:39 +1000
"John Sharpe" <johsharpe@...> wrote:

Hi all,

I just had a thought about new users of the uBitx and the Bitx40.

I have both of these fine rigs but with my good antenna - a ZS6BKW
<http://www.nc4fb.org/wordpress/zs6bkw-multi-band-antenna/> at 30 feet
- the receivers are swamped by noise and big signals on 40 metres.

When I tested just now a 59+ 10 signal on my IC-7300 was unreadable on
the Bitexes with the big antenna (which has a low SWR at 40
metres) because of noise. With an antenna of just 6 feet of wire in
the shack the signal was readable (but weak) on the Bitexes!

I usually use a tuner beween the antenna and the Bitexes - that works
fine to tame the noise. Also I have fitted an RF control to the
Bitx40 that helps quieten big signals.

But if you have lots of noise in the receiver and no tuner - try a
smaller antenna on receive (it will be no good for transmitting). If
that improves things maybe you need a tuner or an RF control.

73s John V2VOL



---
This email has been checked for viruses by AVG.
http://www.avg.com

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

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

Tom Christian
 

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

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: 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

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