Date   
Re: uBitx Component list

Michael
 

Noel,

I would be interested in this also - Think it would make a great project
--

KG5UMH
Michael - DM93am

ESP8266 or ESP32 Raduino Alternatives?

Robert Weiman
 

I just got my uBitX, and I plan to only do the longevity and reliability fixes before starting to use it.  While reading up on them, I noticed some threads/pages about Raduino replacements involving other Arduino boards for more I/O, etc.  I was wondering if anyone had tried the ESP8266 or ESP32 running the Arduino core as an alternative with more space for expanding into some of the digital protocols?

Thanks,
Bob

Re: antenna tuner for uBitx

Tim Gorman
 

Dave,

Are you sure the ZM-2 has air variables? Based on the pictures at their
site it sure looks like they use poly-type variables caps as well.

I also question their claim that they can tune anything using no
switched inductor. I'm pretty sure there are antenna configurations,
especially with low values of capacitive reactance, that it will have a
hard time tuning unless the inductor can be changed.

tim ab0wr

On Tue, 20 Mar 2018 05:46:41 -0400
"David Wilcox via Groups.Io" <Djwilcox01=yahoo.com@groups.io> wrote:

I think that is a good choice. I like the Emtech ZM-2 one better as
it has air variables whereas the 4SQRP one uses poly variables. I am
old fashioned and just like the larger "tougher" air variables,
especially if running over 10 watts.

Dave K8WPE

On Mar 19, 2018, at 6:08 PM, Tim Gorman <tgorman2@...> wrote:

This tuner is not automatic but it does provide a good load to the
transmitter while adjusting the tuner.

http://www.4sqrp.com/4stuner.php

As soon as I get a little money ahead I'm going to order one.

tim ab0wr

On Mon, 19 Mar 2018 09:00:24 -0400
"David Wilcox via Groups.Io" <Djwilcox01=yahoo.com@groups.io> wrote:

While I agree somewhat I am not in favor of an automatic antenna
tuner because if your wire (especially with a new antenna or
experimental antennas) and supporting arrangement leave you
without a close match the time it takes the automatic tuner to get
a match it may be too long out of tune and blow your finals. With
a manual tuner you can key down for a short time while tuning, let
it rest a few seconds, try again getting closer, and finally get
your match. Keeps the finals cool and prevents the smoke from
being released.

I have a Z 11 Pro and while I have not blown any finals I am very
touchy with my antennas and check them with an analyzer before
using it, just to make sure I am close.

I prefer a small Z match like the Emtec, 4SQRP tuner, GQRP tuner,
etc. At the home shack I use an MFJ 300 watt roller inductor
tuner. The reason I like manual tuners at home is I can look at
the numbers on the dials and if they are different from what I
usually see I look for antenna trouble, ie., antenna down, ice
coated, wrong antenna, a short somewhere. With the automatic
tuner it just tunes and you don't know if its the antenna or the
tuner that is making your xmtr happy. And even at 5 watts or less
we can fry a 510.

I admit I am a nerd and like to tinker versus those who like to
"just get on the air and make a contact". My preference. This is a
wonderful hobby and we all are different.

Dave K8WPE

On Mar 19, 2018, at 6:37 AM, Curt M. <Kc3hjp@...> wrote:

I use my LDG Z-11ProII with an end fed wire and my Bitx40. The
tuner only requires 100mW of signal to auto tune.

http://www.ldgelectronics.com/c/252/products/21/9/1




Re: uBitx Component list

Ken KM4NFQ <km4nfq@...>
 

Are the components on the microBITX 0805, 1206, or ???

On Tue, Mar 20, 2018 at 9:18 AM, Michael <kg5umh@...> wrote:
Noel,

I would be interested in this also - Think it would make a great project
--

KG5UMH
Michael - DM93am


Re: For sale micro bitx

Walter
 

On Mon, Mar 19, 2018 at 08:12 pm, <W7zim@...> wrote:
Just received number 546/3 with the dreaded WX op amp.

It's for sale for $109 postage paid any where in USA. Brand new and untouched.

Prefer paypal.

If interested please contact me off line.

w7zim at Yahoo dot com

Fred, W7ZIM
Ill buy it from you using Paypal.

Please send needed info to W9KJO@...
--
73, W9KJO
Walter

Re: Replacement vfo

Don, ND6T
 

Richard, Since you didn't get a reply, perhaps it was me. In 2016 I built a vfo for the BITX40 using an AD9850, a Nano, and a 1602 I2C display. Shortly after I posted on BITX Hacks Farhan announced the Raduino so I changed to that. The design is extremely simple and it works exceptionally well, but with only one output it would be more difficult to add CW. Here is a link to that project: http://www.nd6t.com/qrp/EZvfo.htm
I upgraded it to rotary encoder control for a superior experience. The software needs to be changed to work the BITX but I can do that for you since that was the original purpose. Is this what you were looking for? 73, Don

Re: 13.8 v power supplies safe for bitx?

Walter
 

On Thu, Mar 15, 2018 at 06:12 pm, Tim Gorman wrote:
Jerry,

I'm not sure everyone understands what foldback current limiting
is. Your message 40729 explains it well. In action it is like a fuse.
The power supply opens the power lead until the operator takes an
action.

It is not the same thing as current limiting.

I don't have any power supplies with foldback current limiting so for
me a fuse is the next best thing.

tim ab0wr

On Thu, 15 Mar 2018 16:46:37 -0700
"Jerry Gaffke via Groups.Io" <jgaffke@...> wrote:

True.  The standard current limiting supply I described is not
something to lean on to avoid driving the final too hard, that's not
what I was suggesting. If there's a current limit on the finals,
should be foldback current limiting:
https://groups.io/g/BITX20/message/40719
OK Great info so what size fuse?  What is the maximum safe current for the circuit?

Thanks
 
--
73, W9KJO
Walter

Re: uBitx Component list

Walter
 

A Component list would be great
--
73, W9KJO
Walter

Re: antenna tuner for uBitx

ajparent1 <kb1gmx@...>
 

THe ZM-2, 4Sqrp, SLT, and L-tuner all work.

Personally the 4sqrp, L-tuner, SLT, and Elecraft T1 are in use here for power up to 10W
and do the job for multiple QRP radios.  For higher power I have a L-tuner I built that
easily takes 100W.  Those only get used for the inverted L and the 160M Inverted V
as all my other antennas are 50 ohm resonant as that saves losses though a tuner
and coax.

By far the best antenna is a matched one.  Second best is any needing a tuner.

Allison

Re: A simple VOX control circuit for the BitX-40 to allow it to be used for FT-8

R. Kuehn
 

Hi John,

Interesting simple design. You could probably get away without the isolator or extra SSR, just connect the base of a transistor to the op-amp output and you'd be good to go.

I went with a slightly more complex design after G4ILO, http://www.g4ilo.com/usblink.html, that rectifies the audio signal to turn on a transistor switch (schematic attached), however I could not get the base voltage on the transistor high enough to 'turn on the switch' so to speak. So after much fiddling and noodling I cheated and put in a comparator to drive the base of the transistor. 

There are many designs out there like a dual stage op-amp, from N1HFX, http://www.rason.org/Projects/basicvox/basicvox.htm, and another discrete transistor type from G8MNY, http://www.deserthound.com/amateur-radio/vox.html. If I would do it again I would go with the simpler version of the G8MNY as the final NPN will always be driven fully on when the vox is activated.

At some point I want to modify the bitx40 code to enable CAT but it is far down on my workbench list, and maybe someone will beat me to it ;^)

Ralph
N9WTX




On Tue, Mar 20, 2018 at 7:32 AM, John P <j.m.price@...> wrote:
As promised, I uploaded the description of the simple VOX interface between my PC and the BitX-40 that I've been using for FT-8. I suppose it will also work for other digital modes, and should really be able to work with almost any radio provided the PTT voltage & current don't exceed the specifications of the SSR I used.

Those of you who know me know that I'm a real hacker when it comes to hardware, so all suggestions for improvement are always welcome (email: my call at ARRL.net). Or post here so all can kibitz!

--
John - WA2FZW


Re: uBitx Component list

 

Ken, most of the SMD components are 1206 size.

Joel
N6ALT

Re: A simple VOX control circuit for the BitX-40 to allow it to be used for FT-8

Gordon Gibby <ggibby@...>
 

Locally, our design used a simple one transistor audio amplifier to properly develop a strong enough signal to be rectified and turn on a transistor switch to drive a relay.

We actually made our own circuit board for this.

We found that having the relay output dramatically reduced the amount of RF interference problems that we had.  Using a transistor output by itself resulted in rigs that would lock on.

Others have solved this problem with opto isolators.   

There are a lot of ways to get this to work.

Gordon 


On Mar 20, 2018, at 11:09, R. Kuehn <rekuehn@...> wrote:

Hi John,

Interesting simple design. You could probably get away without the isolator or extra SSR, just connect the base of a transistor to the op-amp output and you'd be good to go.

I went with a slightly more complex design after G4ILO, http://www.g4ilo.com/usblink.html, that rectifies the audio signal to turn on a transistor switch (schematic attached), however I could not get the base voltage on the transistor high enough to 'turn on the switch' so to speak. So after much fiddling and noodling I cheated and put in a comparator to drive the base of the transistor. 

There are many designs out there like a dual stage op-amp, from N1HFX, http://www.rason.org/Projects/basicvox/basicvox.htm, and another discrete transistor type from G8MNY, http://www.deserthound.com/amateur-radio/vox.html. If I would do it again I would go with the simpler version of the G8MNY as the final NPN will always be driven fully on when the vox is activated.

At some point I want to modify the bitx40 code to enable CAT but it is far down on my workbench list, and maybe someone will beat me to it ;^)

Ralph
N9WTX

<Screen Shot 2018-03-20 at 10.06.46 AM.png>


On Tue, Mar 20, 2018 at 7:32 AM, John P <j.m.price@...> wrote:
As promised, I uploaded the description of the simple VOX interface between my PC and the BitX-40 that I've been using for FT-8. I suppose it will also work for other digital modes, and should really be able to work with almost any radio provided the PTT voltage & current don't exceed the specifications of the SSR I used.

Those of you who know me know that I'm a real hacker when it comes to hardware, so all suggestions for improvement are always welcome (email: my call at ARRL.net). Or post here so all can kibitz!

--
John - WA2FZW


Re: antenna tuner for uBitx

Keith VE7GDH
 

Rajan VU3JYT wrote...

what type of antenna tuner required for uBITX as
it has only 10w power
Some might prefer a "homebrew" approach, but I have
an Elecraft T1 auto-tuner that I'm very happy with.
They rate it at 20W for SSB and CW but have "stress
tested" it briefly to higher power levels.

http://www.elecraft.com/T1/T1.htm

--
73 Keith VE7GDH

Re: A simple VOX control circuit for the BitX-40 to allow it to be used for FT-8

Joe Puma
 

Curious why you didn’t opt for a serial PTT circuit for the btx40 which is just as easy to make and easily controlled through a serial port which can be configured in wsjtx. 

I was interested in picking up a easydigi for digital modes with my HF rig because I was getting all types of interference, noise, or even RF into the audio lines with it directly connected, so I need something to isolate but I found a pretty cool cat dongle with audio features for my Yaesu FT-840. 

If you get the right easydigi it will also have the components on it for an isolated push to talk as well. So I was just wondering why you went the Vox route. 

Joe
KD2NFC 





On Mar 20, 2018, at 8:32 AM, John P <j.m.price@...> wrote:

As promised, I uploaded the description of the simple VOX interface between my PC and the BitX-40 that I've been using for FT-8. I suppose it will also work for other digital modes, and should really be able to work with almost any radio provided the PTT voltage & current don't exceed the specifications of the SSR I used.

Those of you who know me know that I'm a real hacker when it comes to hardware, so all suggestions for improvement are always welcome (email: my call at ARRL.net). Or post here so all can kibitz!

--
John - WA2FZW

Re: Mechanical work is done...

Nelson
 

Howdy Steve,

My "forte" is radios that glow in the dark so most all of my test equipment also glows in the dark. As to what all that equipment on my bench does is heat my shop in the winter :-)

(please note my fascination with magic eye tubes...) 

Nelson
KG7GYS


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... 

On Mon, Mar 19, 2018 at 9:38 PM, Steve Thatcher <stevep2p@...> wrote:
Looks good Nelson.  I do like that speaker grill....The pic of your test bench is...um...awesome!  (as Steve asks himself- "what does all that stuff DO??")  Aloha, Steve

Virus-free. www.avg.com




--
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: A simple VOX control circuit for the BitX-40 to allow it to be used for FT-8

Randy
 

Re: A simple VOX control circuit for the BitX-40 to allow it to be used for FT-8

Gordon Gibby <ggibby@...>
 

most computers now don't have serial ports, so it is extra $$ to purchase converter.   Cheaper for me just to take audio, add a few transistors/relay.   Lots of different ways to do it.      We used inexpensive audio transformers from China in our design.   


http://www.qsl.net/nf4rc/SmallBookSoundCardConstructionManual2.pdf




From: BITX20@groups.io <BITX20@groups.io> on behalf of Joe Puma <kd2nfc@...>
Sent: Tuesday, March 20, 2018 12:25 PM
To: BITX20@groups.io
Subject: Re: [BITX20] A simple VOX control circuit for the BitX-40 to allow it to be used for FT-8
 
Curious why you didn’t opt for a serial PTT circuit for the btx40 which is just as easy to make and easily controlled through a serial port which can be configured in wsjtx. 

I was interested in picking up a easydigi for digital modes with my HF rig because I was getting all types of interference, noise, or even RF into the audio lines with it directly connected, so I need something to isolate but I found a pretty cool cat dongle with audio features for my Yaesu FT-840. 

If you get the right easydigi it will also have the components on it for an isolated push to talk as well. So I was just wondering why you went the Vox route. 

Joe
KD2NFC 





On Mar 20, 2018, at 8:32 AM, John P <j.m.price@...> wrote:

As promised, I uploaded the description of the simple VOX interface between my PC and the BitX-40 that I've been using for FT-8. I suppose it will also work for other digital modes, and should really be able to work with almost any radio provided the PTT voltage & current don't exceed the specifications of the SSR I used.

Those of you who know me know that I'm a real hacker when it comes to hardware, so all suggestions for improvement are always welcome (email: my call at ARRL.net). Or post here so all can kibitz!

--
John - WA2FZW

Re: A simple VOX control circuit for the BitX-40 to allow it to be used for FT-8

Randy
 

Re: ESP8266 or ESP32 Raduino Alternatives?

bobolink
 

I've been evaluating the ESP32 (wireless stacks, dual-core concurrency and FreeRTOS) but sorry to say I haven't actually tried compiling the uBitx code.
I know there are some libraries that haven't been converted (like the InfraRed controller IRRemote) but I don't think there is anything exotic in the bitx code that would cause problems.

The setup is here: GitHub if you'd like to try.

If you have a link to a file, I could at least see if it compiles on my espressif esp32 dev board: esp-devc

Re: A simple VOX control circuit for the BitX-40 to allow it to be used for FT-8

Joe Puma
 

Ha creative. But it’s just usb to serial. I use this circuit pictured for my PTT after the usb to serial dongle. I have another diode on the transceiver side. image1.png 

I use with my  Baofeng HT and Yaesu radio. This is my ghetto digital mode interface I use with the Yaesu.

image2.jpeg

I wanted to get this for the Yaesu for its isolation transformers and compactness. 


Joe
KD2NFC 





On Mar 20, 2018, at 12:42 PM, Randy <randy@...> wrote: