Date   
InKits Nextion case power wiring

Ken Simmons
 

I'm using the 3.5" Nextion case from InKits (amateurradiokits.in) and have a couple of questions/concerns on the power wiring. The only schematic I've found doesn't show all the pieces that are included like the fuse and the extra switch. I've tried to create a schematic from the pictures available. The problem there is that I'm coming up with a strange configuration. Specifically, the fuse appears to be after both switches. I also don't see a diode, either in series or as a crowbar. The wiring of the power connector is difficult to see in all the pictures so the diode could be there, but that would put it before the fuse.

I've also seen pictures of a small circuit board that contains the crowbar diode. I didn't receive a board like that, but I believe those pictures were from earlier versions of the case.

I know there are many posts about power protection, but I couldn't seem to find any for this particular case and wiring setup. It can include a battery and a switch configuration for charging the battery, but you can't simply connect power to a LiOn or LiPo battery for charging without risking safety.

Any suggestions or clarification would be appreciated.

Re: Help to point me into right direction

Tommaso Ravaglioli
 

Hi Bruce,
just a note: cross band, or more precisely full duplex operation is
not required to work ISS.
It is just a direct QSO between two hams, one of which is somewhat a
newbie, somewhat stuck to a single frequency.
Any handheld with the old -600 kHz shift will do, and you could very
well compensate for a suboptimal antenna with higher power, something
that when working satellites a definite no-no.
Regarding power, again ISS is not a satellite, but just a Kenwood
TM-710E (or an Ericsson handheld, as there are two stations in ISS) in
a weird place. When we work ARISS contacts, we run farly high power,
around 50W with a cross element yagi, and the standby station is
required to push 200W on an omni antenna. Go figure...
As I stated before, the most difficult part is to have an astronaut on
the other side. They have plenty of work to do, and while ham radio
was an important outreach tool, it got somewhat superseded by Twitter
and all social media brought by broadband internet on ISS.

73 de Tommaso
IZ2QYZ

Il giorno mer 27 nov 2019 alle ore 14:04 Black Wolfe
<blackwolfe@...> ha scritto:

the Baofeng offers cross-band operation, needed for operating ISS and
many (most/all?) satellites. Not all 2M/70cm units are capable of
this. Most of satellite operation is about high-gain directional
antennas and aiming them. Transmit power is of little importance.

Bruce W. ~KV4OE~


On 11/27/19 5:03 AM, Tommaso Ravaglioli wrote:
Hi Robert,
for ISS the Baofeng is a good start, and it is great even starting to
receive SSTV images. If you want to just receive, an handheld scanner
or an SDR stick will give you the taste of space ops.
But ISS is not a satellite, is more similar to a QSO with a fellow
ham. Pretty much any handheld will do, with a cell phone or a computer
to decode SSTV and get the hang of things like orbital mechanics.
The choke point is astronauts availability, which is quite scarce
commodity, nowadays. So the biggest chance is to connect with
automatic systems, mostly the APRS digipeater or the SSTV downlink.

Cheers,
Tommaso

Il giorno mer 27 nov 2019 alle ore 08:29 <forest.roby@...> ha scritto:
Dear All,

This dual band bussiness was new to me... farher google seaches convinced me that "cough*Baofeng*cough" is a good start. Might be a good project to build an amplifier for it, if possible.
Thanks for the help.

Sorry for the off topic!

Robert

Re: Help to point me into right direction

Black Wolfe
 

the Baofeng offers cross-band operation, needed for operating ISS and many (most/all?) satellites.  Not all 2M/70cm units are capable of this.  Most of satellite operation is about high-gain directional antennas and aiming them.  Transmit power is of little importance.

Bruce W.  ~KV4OE~

On 11/27/19 5:03 AM, Tommaso Ravaglioli wrote:
Hi Robert,
for ISS the Baofeng is a good start, and it is great even starting to
receive SSTV images. If you want to just receive, an handheld scanner
or an SDR stick will give you the taste of space ops.
But ISS is not a satellite, is more similar to a QSO with a fellow
ham. Pretty much any handheld will do, with a cell phone or a computer
to decode SSTV and get the hang of things like orbital mechanics.
The choke point is astronauts availability, which is quite scarce
commodity, nowadays. So the biggest chance is to connect with
automatic systems, mostly the APRS digipeater or the SSTV downlink.

Cheers,
Tommaso

Il giorno mer 27 nov 2019 alle ore 08:29 <forest.roby@...> ha scritto:
Dear All,

This dual band bussiness was new to me... farher google seaches convinced me that "cough*Baofeng*cough" is a good start. Might be a good project to build an amplifier for it, if possible.
Thanks for the help.

Sorry for the off topic!

Robert

Re: Cec v1.2 software question

Evan Hand
 

Barry,

It is my understanding that the ATT function of the CEC software is using the "skirt" of the first 45 MHz filter to "Attenuate" the signal.  This works by adjusting the second VFO or Clock 1 to move the received section of the band to be just off of the center of the crystal.  If the signal is getting stronger or clearer, then the BFO might be slightly out of adjustment 

The way the uBITX works is the dial or received frequency is added to the first VFO (Clock2 of the Raduino) to get the 45 MHz first IF.  This is passed through the 45 MHz single crystal filter.  Because it is a single crystal, the bandwidth (15 Mhz) is wider than the second 12 crystal SSB filter (2500 Hz).  Also, the slope of the sides of the 45 MHz filter are relatively shallow.  To attenuate the received signal, the second VFO is adjusted up or down to move the portions of the spectrum that are then passed through the second IF and the second 12 crystal filter that has a much steeper slope and bandwidth.  If the alignment of the second VFO and BFO are not correct, then instead of attenuating the signal on the skirt, the recieved part is moving towards the center of the 45 MHz filter.

The one thing to be careful of when adjusting the BFO is to not get to the point where the carrier is not suppressed.  I have had this happen to me when I was trying for the "best" reception and sound on receive.  I then started using an audio spectrum analyzer to adjust the BFO.  This seemed to work the best for me.  Adjusting the BFO when tuned to a clear frequency allows you to use the white noise to adjust the signal "plateau" to start around 500 Hz and drop off at 3000 Hz.

The software can be gotten on the internet for free.  I would try it to see if the received part either too high or too low.

The full description of the uBitx operation is on the HFsignals web page.  There are a couple of errors on the block diagram in the clock1 frequency for upper and lower sideband (they are reversed) and that the v5 board SSB crystal frequency is 11.0592 MHz and not the original v3 and v4 12 MHz.
http://www.hfsignals.com/index.php/ubitx-circuit-description/

Just my thoughts, please be sure to check your rig for proper operation and out of band signals after making adjustments.
73
Evan
AC9TU

Re: #ubitx #ubitx-help How to recognize the PCB/hardware version #ubitx #ubitx-help

 

The version is printed on the PCB top side. Next to antenna connector OR
if you hold the board with power transistors to the back then look at the
right corner for the version.

At 27/11/2019, you wrote:
Question as in topic. I recently bought uBitx and I would like to specify which version I have, unfortunately there are no markings on the PCB
I haven't connected the radio yet.

Re: Help to point me into right direction

Tommaso Ravaglioli
 

Hi Robert,
for ISS the Baofeng is a good start, and it is great even starting to
receive SSTV images. If you want to just receive, an handheld scanner
or an SDR stick will give you the taste of space ops.
But ISS is not a satellite, is more similar to a QSO with a fellow
ham. Pretty much any handheld will do, with a cell phone or a computer
to decode SSTV and get the hang of things like orbital mechanics.
The choke point is astronauts availability, which is quite scarce
commodity, nowadays. So the biggest chance is to connect with
automatic systems, mostly the APRS digipeater or the SSTV downlink.

Cheers,
Tommaso

Il giorno mer 27 nov 2019 alle ore 08:29 <forest.roby@...> ha scritto:

Dear All,

This dual band bussiness was new to me... farher google seaches convinced me that "cough*Baofeng*cough" is a good start. Might be a good project to build an amplifier for it, if possible.
Thanks for the help.

Sorry for the off topic!

Robert

Re: Antuino Can it measure the RF Output Watts

iz oos
 

I believe we could that rather easily adding a directional coupler and an attenuator to bring down the full power at say - 20 or - 30dbm and using PWR mode. I would be interested too.


Il 26/nov/2019 20:53, "Alex Kelly IWUK via Groups.Io" <iwuk=btinternet.com@groups.io> ha scritto:
Hi

Ive bought the Antuino and im extremely pleased with it. What this little beauty does is amazing and makes me wonder how I managed with out it? I have one question though please. Can it measure the RF Output Watts from a radio without damaging it and if so up to how many or is it just milliwatts of RF input power? Ive watched the YouTube video of the guy using it for RF power reading through a small aerial but not the result Id like to use it for?

Many thanks

Alex Kelly

Re: #ubitx-help µBitx wiring - one stupid question #ubitx-help

MVS Sarma
 

On Wed, Nov 27, 2019 at 12:49 PM Przemek <przemek.naganski@...> wrote:
Hi Folks!
I have one stupid question about mic, speaker and key socket. That's exactly what I mean by pin numbering, just like the picture below or otherwise?

Re: Antuino Can it measure the RF Output Watts

 

The Antuino measures max -20dbm. i.e 1/100 of a milliwatt.
You will need 50db attenuator for 1W or 60db for 10W and so on.
The initial attenuator that connects to the transmitter MUST be
able to handle the watts!

Raj


At 27/11/2019, you wrote:
Hi

Ive bought the Antuino and im extremely pleased with it. What this little beauty does is amazing and makes me wonder how I managed with out it? I have one question though please. Can it measure the RF Output Watts from a radio without damaging it and if so up to how many or is it just milliwatts of RF input power? Ive watched the YouTube video of the guy using it for RF power reading through a small aerial but not the result Id like to use it for?

Many thanks
[]

Alex Kelly

Re: Help to point me into right direction

forest.roby@...
 

Dear All,

This dual band bussiness was new to me... farher google seaches convinced me that  "cough*Baofeng*cough" is a good start. Might be a good project to build an amplifier for it, if possible. 
Thanks for the help.

Sorry for the off topic!

Robert

#ubitx #ubitx-help How to recognize the PCB/hardware version #ubitx #ubitx-help

Przemek
 

Question as in topic. I recently bought uBitx and I would like to specify which version I have, unfortunately there are no markings on the PCB 
I haven't connected the radio yet.

#ubitx-help µBitx wiring - one stupid question #ubitx-help

Przemek
 

Hi Folks!
I have one stupid question about mic, speaker and key socket. That's exactly what I mean by pin numbering, just like the picture below or otherwise?

Cec v1.2 software question

barry halterman
 

I have a question with the CEC v1.2 firmware that I am running in my V4 ubitx. Can someone explain to me how or what happens when the ATT (attenuator) is enabled in software? What would cause receiver sensitivity to be better with the ATT on and adjusting the slider half way to the right, then when the ATT is turned off?
Thanks
K3BO

Re: Newbie Support Pages?

Curt
 

Stephen

the information overload can be vast.  if you want to enjoy your stock build - just use the supplied instructions and web content at HF signals. 

there is one pertinent detail to think about - what type of display to you plan to end up with?  I am thrilled with the stock LCD (okay boring but it does the function for many of us around the globe, with low electricity) - but if you plan to upgrade that will influence your case (many options here - mine is in a amateurradiokits case from India.  BTW he has nice building info at ubitx.com last I knew). 

please note the v5 being sold now is said to require no mods.  many additions are rather simple - just AGC and a S-meter-like movement, my CW filter is still external until I build another one to integrate. 

enjoy your build and operation of the rig - yes turn off the info overload until you are ready.

73 Curt

Re: Gordon Gibby Digital Interface Blank boards

Curt
 

My thanks to both of you for your contributions to melt-solder ham radio.  The relay board works and its installed.  I have the nice digital interface kit available for building this winter. 

Okay the Thanksgiving holiday on Thursday is unique to the US -- but happy thanksgiving to all in the world-wide BITX community. 

73 Curt wb8yyy

Re: Gordon Gibby Digital Interface Blank boards

Gordon Gibby
 

Thanks for all you did on this!!!


On Tue, Nov 26, 2019 at 6:08 PM N8DAH <Dherron@...> wrote:

I have discontinued the kit and have posted the last 25 boards.

The relay kit only has a few left as well.

Digi Boards: https://shop.kit-projects.com/index.php?route=product/product&path=59&product_id=122

Relay kits: https://shop.kit-projects.com/index.php?route=product/product&path=59&product_id=119

73
--
David

 N8DAH
Kit-Projects.com

Shop is open!

Gordon Gibby Digital Interface Blank boards

 

I have discontinued the kit and have posted the last 25 boards.

The relay kit only has a few left as well.

Digi Boards: https://shop.kit-projects.com/index.php?route=product/product&path=59&product_id=122

Relay kits: https://shop.kit-projects.com/index.php?route=product/product&path=59&product_id=119

73
--
David

 N8DAH
Kit-Projects.com

Shop is open!

locked eBay scope find #off_topic

Doug W
 

This is off topic but I want to show off my new to me toy.  $87 ($71 + shipping) on eBay 100MHz  - 2 channel.  Pic is with cell phone audio function generator app and $15 Amazon probes.  Sure a new DSO would be nice but I dig the green glow. 



--
www.bitxmap.com

Antuino Can it measure the RF Output Watts

Alex Kelly IWUK
 

Hi

Ive bought the Antuino and im extremely pleased with it. What this little beauty does is amazing and makes me wonder how I managed with out it? I have one question though please. Can it measure the RF Output Watts from a radio without damaging it and if so up to how many or is it just milliwatts of RF input power? Ive watched the YouTube video of the guy using it for RF power reading through a small aerial but not the result Id like to use it for?

Many thanks

Alex Kelly

Re: Newbie Support Pages?

Arv Evans
 

There are some URL,s at the end of each message posting.  These give some pointers to BITX and uBITX basics.  There are other sites, but this is a good place to start.  

Arv. K7hkl
_-_


On Tue, Nov 26, 2019, 12:09 PM Stephen Wandling <swandling@...> wrote:
I am still planning to get a uBITX, just as soon as my 'projects' list is a bit shorter. Are there web pages that would be useful to a BITX newbie. I scan the posts here from time to time, but cannot seem to find the lower rungs on the ladder you folks have been climbing. 

I am definitely not new to ham radio, and I have built a lot of gear, from scratch and from kits. 

Any pointers to useful pages will be appreciated.

VE7NSD
Stephen