Date   
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

Re: Newbie Support Pages?

Jack, W8TEE
 

Try ubitx.net

Jack, W8TEE

On Tuesday, November 26, 2019, 2:09:03 PM EST, 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

--
Jack, W8TEE

Newbie Support Pages?

Stephen Wandling
 

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

Re: Help to point me into right direction

Gwen Patton
 

Robert,
The important thing to know about amateur satellites is that nearly all of the still-functioning birds use a dual-band mode. The uplink frequency (what you talk on) is on 2m FM, and the downlink (what the satellite replies on) is usually 70cm FM. So your radio needs to operate on both bands, and be able to transmit on one while listening on the other at the same time. You'll also need some sort of dual-band beam antenna for both frequencies. There's a LOT of tutorials on how to make such antennas from common materials, but a pre-made example is an Arrow antenna, a portable, dual-band hand-aimed Yagi. The company was named "Arrow" because the original antennas were made from the aluminum shafts of target arrows, cut to the appropriate length.

The BitX and uBitX are great radios, but they're not the right bands to do this. They are HF radios, in bands from 80m to 10m, and they don't have FM modulation. You'll need some sort of 2m/70cm dual-VFO transceiver, probably a handheld. I've done this with a Yaesu VX-5r, back when mine still worked years ago. You can probably make a decent stab at it with a Baofeng or other cheap dual-band handheld, but you'd probably have better results with a radio that's a bit better made; those Chinese handhelds are made to be cheap, not to necessarily be good. It's possible to do it with one, but an Icom, Yaesu, or Kenwood -- or an Alinco, or some other international brand that ISN'T a cheap Chinese brand -- will probably serve you better.

Check the AMSAT.ORG website for more information, and search on Youtube for amateur satellite videos. I know that K6UDA just did one in the last week.

Now, since this is off topic, I'm going to back on out of here. 

73 and good luck,
Gwen, NG3P

Better photos of Amateur Radio kits AGC kit

KN4SMO <dtb2greenville@...>
 

Hi Since can't determine the layout from schematics could someone post a couple detailed photos of this kits layout please.

I see them in photos but not good enough.

Thanks Scott

Re: Help to point me into right direction

forest.roby@...
 

Dear All,

Thank you for the answers. All of them are really helpful.

Well I did a lot of research on the internet in the last couple of days. Not being a radio guru I might not have used the right words. 

If there is no DIY solution than I have to fined a suitable transceiver to buy ( on a budget ). Than again even the shipping cost can be a problem. Buying something heavy from the US can be expensive. I live in Hungary. But that is my problem. :) 
That "weekends project" looks promising, I already emailed them about the shipping.
That handheld radio is not really what I am looking for. I'd rather like something I can operate from my workshop.

About the antenna, I am hopeful that I can solve that. Maybe I am only wishful. :)

I am in progress to fire up my SDR console. Goal is to listen to weather satellites and ISS if possible. I have an antenna already but planning to build a V-shape -one as well. A transceiver would be a fine addition to this setup. 

Thank you again!

Robert

Re: Help to point me into right direction

Tommaso Ravaglioli
 

Hi Robert,
I think this topic is quite OT in this group.
I have quite a lot of experience working ISS and it is even different
from working satellites.
Please write me, and I will gladly help.
For the others, please have a look at:
https://issfanclub.eu/

73 de IZ2QYZ

Il giorno mar 26 nov 2019 alle ore 13:13 <forest.roby@...> ha scritto:

Dear All,

I am new to the world of Ham Radio.

Having said that I have set myself a goal to get in contact with ISS via Radio. As I understand to achive this I need a radio transceiver with the following specs: 2m band (148.2Mhz if I remember correctly), 25-100 Watt and other things I am sure. To make this more difficult I don't want to buy a ready made radio rather I would like to, try to build one.
Can you point me into the right direction, where I can find a doable DIY project with decent instuctions to achive my goal? ( If there is any )
I looked into BITX and Minima but I am not sure that they are the right ones for me.

I'd appreciate any help you can give me.
Robert

, ,

Re: Help to point me into right direction

Eric KE6US
 

Very doubtful that you are going to find a homebrew rig for 2m suitable for a new builder. I hate to discourage anyone from trying anything, but it might be more satisfying in the end to stick with the ISS goal building as much as you can, while getting a few homebrew or kit HF rigs under your belt. Successfully working the ISS is enough of a learning experience and accomplishment with commercial equipment to be satisfying. In 62 years, I've never done it (hi).

There's a guy who goes around to all the hamfests demonstrating that you can work a satellite with a handheld transceiver and a handheld yagi in the parking lot.  I've seen him twice a few years apart and he was successful both times--unless it was a setup and he was working a friend at the far end of the parking lot.

Eric KE6US

On 11/26/2019 4:13 AM, forest.roby@... wrote:
Dear All,

I am new to the world of Ham Radio. 

Having said that I have set myself a goal to get in contact with ISS via Radio. As I understand to achive this I need a radio transceiver with the following specs: 2m band (148.2Mhz if I remember correctly), 25-100 Watt and other things I am sure. To make this more difficult I don't want to buy a ready made radio rather I would like to, try to build one.
Can you point me into the right direction, where I can find a doable DIY project with decent instuctions to achive my goal? ( If there is any )
I looked into BITX and Minima but I am not sure that they are the right ones for me.

I'd appreciate any help you can give me.
Robert

, , 

Re: Help to point me into right direction

Black Wolfe
 

On 11/26/19 7:13 AM, forest.roby@... wrote:
Dear All,

I am new to the world of Ham Radio.

Having said that I have set myself a goal to get in contact with ISS via Radio. As I understand to achive this I need a radio transceiver with the following specs: 2m band (148.2Mhz if I remember correctly), 25-100 Watt and other things I am sure. To make this more difficult I don't want to buy a ready made radio rather I would like to, try to build one.
Can you point me into the right direction, where I can find a doable DIY project with decent instuctions to achive my goal? ( If there is any )
I looked into BITX and Minima but I am not sure that they are the right ones for me.

I'd appreciate any help you can give me.
Robert

, ,
Well, I've not done this myself, but the uBitx is not the radio for the task.  This has been discussed on the Baofeng UV-5A site a time or three.  The cheap "5 watt" Baofeng can do this, with a good antenna.  By good I mean high gain.  Home brew tape measure or coat hanger wire Yagi type antennas are the low budget answer. Tracking is generally  hand-held.  Mounted antennas get complicated (expensive) quickly.  There are many sites on-line showing how-to do this.

FWIW: The magic is not so much the radio (assuming cross band capability) so much as the high gain antenna.

Bruce W.  ~KV4OE~

Re: PTT activates menu...

Evan Hand
 

I looked up the VU3SUA case.  It appears to be painted, so insure that the board and antenna grounds are solid.  This may take "star" lock washers and / or removing the paint around the the board and connector fastening locations.  Also be sure to run the shack earth ground to a point on the rig that is solidly grounded to the case.

The pull-up resistors are a good idea as well, though did not need them in my case.

Again, just my thoughts.
73
Evan
AC9TU

Re: PTT activates menu...

Gary Anderson
 

I am glad that Evan spoke up yet again.  Always best to invoke good RF practices.

To further the discussion: I think of this as an "Aggressor" and a "Victim."  RF is the Aggressor and the Nano controller is the potential Victim.
Solution is found when the Aggressor can not overcome the potential Victim.  Evan addresses the RF Aggressor.  What also can be done to make the Victim less susceptible?
I would try external pull-ups on PTT and F_BTN to the 5V on the Raduino board (not directly on the Nano).  Start with ~4.7K pull-ups.  This would make the pull-ups stronger and shunt some RF energy away from the Nano.
I would also disable the internal pull-up on PTT and F_BTN in the software if you have the ability to do so.
This is just a thought experiment, with no real world data, but resistors are cheap, easily available, easy to add and remove.

Rgds,
Gary
AG5TX

Re: Help to point me into right direction

Evan Hand
 

I have not used or operated any of the following.  I am just forwarding what I have found searching the internet.

For operating frequencies and modes:
https://www.amsat.org/amateur-radio-on-the-iss/

For VHF/UHF kits:
http://www.cqdx.ru/ham/do-it-yourself/weekend-project-vhf-qrp-fm-transceiver/

The kit only puts out 1 watt max, so will need an amplifier.
http://pdfstream.manualsonline.com/6/6eabf18f-a997-4c37-a940-579233423ee4.pdf
http://www.ah6le.net/index.php/vhf-solid-state-kilowatts

You will also need a directional antenna with azimuth/elevation capability.  

Of course if you want to home brew everything, then check out the ARRL manuals on all of the above.

Just my browsing info.  Would suggest that you do some browsing as well.
73
Evan
AC9TU

PS: I would also suggest that you try to find another site for help, as this one is focused on the BITX series of designs for HF.  There has been some discussion on an up converter for the uBitx, however I have not seen much traction on that thread.

Re: PTT activates menu...

Evan Hand
 

Steven,
This is exactly what happened to me on my version 4 uBitx that I traced back to RF getting into the radio on the shield of an off center fed dipole.  Only solution was to insure good ground on the rig, snap on ferrite chokes on the outside of the coax (3 before entering the shack and one on the feed to my SWR/Power meter).  I also put smaller snapons on the digital lines to the Raduino.  Bought a kit of them on Amazon.  Be sure the largest fits the outside of your coax.

A possible test is to try the radio into a dummy load on the same frequency as you currently have the issue.  If it does not happen on the dummy load, than for sure the problem is RF feedback.

Note:  I have my uBitx rigs in metal enclosures.  If yours is all plastic, then may need to use some shielding tape on the inside of the case grounded to the braid side of the output connector.

The above is what I found, your problem may be different.

73
Evan
AC9TU