Date   
Re: Power Output measurement #ubitxcw

Richard Pushman
 

I should redo this, get a few more data points, be more thorough.

Hamcation

Jack, W8TEE
 

If anyone is going to Hamcation in Orlando and see a shirt with this on the back, stop and say Hi



         µBITX + JackAl =
Inline image

Jack, W8TEE

Re: Spurs/Harmonics fixes for v4 based on v5 board design?

ajparent1/KB1GMX <kb1gmx@...>
 

Jerry,

I have two of those PLJ-8LED-H-RF counters and they work very well.
For the price any complaints are to be ignored. IT does have a matching mode 
where you read your standard and then save it and then on it displays the difference.


Allison

Re: Spurs/Harmonics fixes for v4 based on v5 board design?

ajparent1/KB1GMX <kb1gmx@...>
 

Short and to the point.  RTL SDR is a iuseful device but wrong for the task, even
most SAs lack resolution..  Some have a frequency counter built in and for
comparative use they are useful.  Some digital scopes offer a frequency 
counter as well.  As long as it reads to the nearest Hz your good.

Two ways both cheap:

Frequency counter like the PLJ-8LED-H-RF.

The other is two oscillator and a diode mixer and audio amp.
Beat one oscilator against the other and get the difference
which will be an audio tone.

FYI you only need to match to 100hz of each other as the absolute
frequency is less important.

Allison

Re: Hamcation

VE3MIC
 

That is a work of art!

On Wednesday, January 30, 2019, 3:49:00 p.m. EST, Jack Purdum via Groups.Io <jjpurdum@...> wrote:


If anyone is going to Hamcation in Orlando and see a shirt with this on the back, stop and say Hi



         µBITX + JackAl =
Inline image

Jack, W8TEE

Re: Hamcation

Albert Peter
 

Website now updated with V0.94 and new photo.

Al

 

Sent from Mail for Windows 10

 

From: Jack Purdum via Groups.Io
Sent: Wednesday, January 30, 2019 3:48 PM
To: BITX20
Subject: [BITX20] Hamcation

 

If anyone is going to Hamcation in Orlando and see a shirt with this on the back, stop and say Hi

 

 

 

         µBITX + JackAl =

 

Jack, W8TEE

 

Re: display not working

ajparent1/KB1GMX <kb1gmx@...>
 

Dan,

I'll assume its winter were you are.  Ever hear of ESD, static electricity? 
It kills computer hardware.

The other could be a power or connection issue but if it suddenly failed I'd bet on 
a finger of lightning, literally from your finger to the unit.

Allison

Re: Hamcation

Jack, W8TEE
 

That's Al's work!

Jack, W8TEE

On Wednesday, January 30, 2019, 6:04:36 PM EST, VE3MIC via Groups.Io <ve3mic@...> wrote:


That is a work of art!

On Wednesday, January 30, 2019, 3:49:00 p.m. EST, Jack Purdum via Groups.Io <jjpurdum@...> wrote:


If anyone is going to Hamcation in Orlando and see a shirt with this on the back, stop and say Hi



         µBITX + JackAl =
Inline image

Jack, W8TEE

Re: ubitx axicom relay question #ubitx

ajparent1/KB1GMX <kb1gmx@...>
 

On Tue, Jan 29, 2019 at 06:34 PM, <kc9bg.lisadavis@...> wrote:
omron 1327c1 12v ac g6s-2f
That family does not include AC relays they are all DC.  The problem is the
part number can be one of many flavor of that relay some being gull wing mount 
rather than through hole.  They are good at RF least in my use and they were
not cheap though a reliable vendor.

Unfortunately the part numbers given are ambigious enough to not be
sure of what your getting.  GO for the spec Axicom.

Allison

Re: Power Output measurement #ubitxcw

ajparent1/KB1GMX <kb1gmx@...>
 

Tom,

Dead on.  DC votlage to the radio has a very large impact on power out.
All the work done back last May I included that as many has the Wbrand
audio chip that would fry at 13V and they would know what not regulating
the voltage to the chip limits them too.

I do all testing at either 12.6 (charged gellcell) or 13.8 (automotive systems and
most bench power for high power radios. Astron and Samlex).

Since the power amp design is marginal over all  DC  power applied has far to
great an effect.  So yes the numbers can vary widely and if the DC is not speced
as well as what band its going to be mostly guess.  Also if you have five units
and the same power it all over the map.

Allison

plodding along

ross ingham
 

Well a bit more progress. I seem to spend a couple of days planning ahead then doing a little bit and stop . Oh well it's  all about the journey. Small aside,do the three 3mm jacks have to be so diminutive, my fat welders hands found the nuts a bit tedious.  Cheers Ross 

Is the order website - hfsignals.com still in use? #bitx40

pauln@...
 

I place an order 4 days ago and have only received a PayPal advice confirming my payment and that it has been processed.  I have not received any order confirmation, nor has a there been a response to my email to confirm my order, that was sent to teamhfsigs@...
So am wondering if they are still in business?  
Thank You
Paul vk4apn

Re: Is the order website - hfsignals.com still in use? #bitx40

Vince Vielhaber
 

They're still in business. You'll get a notice soon. Sometimes they get backlogged.

Vince - K8ZW.

On 01/31/2019 12:30 AM, pauln@... wrote:
I place an order 4 days ago and have only received a PayPal advice
confirming my payment and that it has been processed. I have not
received any order confirmation, nor has a there been a response to my
email to confirm my order, that was sent to teamhfsigs@...
<mailto:teamhfsigs@...>
So am wondering if they are still in business?
Thank You
Paul vk4apn

Re: CLK2 low level

vavro@...
 

What part of code is the ATT slider ?
I try load original firmware in the raduino and the output signals was same low.
Thanks
Miroslav
OM6VM

uBitx VFO VFO frequency deviation 700 Hz at 80 meters; 1400 Hz at 40 meters ... #calibration #radiuno #ubitx

OZ8ZN
 

I hope, someone can help with advice

When i  want to send and receive SSB at for example 3,701.000 Mhz, I have to set the display at 3,700.300 MHz, 700 Hz lower. At 40 meters, the difference is about 1,400 Hz.
I have tried several times to calibrate the two VFO settings to many different values, but the signal becomes weak and distorted. I wonder, if the Raduino might be defective?

And, if this is the case, how do I get another raduino?

Re: CLK2 low level

Evan Hand
 

The ATT function in KD8CEC firmware is implemented by moving the Clock#2 signal so that the received signal hits the skirts of the 45mhz filter when compared to the 12mhz filter and then the BFO.  There is a variable if1AdjustValue that is added to the base frequency.

The code starts at line 411 in the sketch that I have with the comment "//for DIY uBITX (custom filter)"

NOTE: this is only in the KD8CEC firmware.  If you are having a low signal with the stock firmware, then your ubitx is misaligned or something else is causing the issue.  My personal guess is that there is an alignment issue that gives the same effect as the ATT function in the CEC firmware.  If you are using the CEC firmware, then the ubitx manager program is the way to ease calibration woes.  It can save all of the values between attempts to tune it in, and there are threads with recommended settings to start with.  It helped me a lot when I got my rig out of wack.  

Hope this helps
73
Evan
AC9TU

Re: uBitX PTT cycling

Vic WA4THR
 

Well, it took a while of careful adjustments to the master frequency, but it is pretty much dead on and sounds the same on USB or LSB, now. So, I'll call phase 1 complete: The basic rig is working with no mods to the main board. I still need to add a bezel to the front panel, I think, to cover the gap on the right where the ribbon cable exits, but next up I will start mods: making sure spurs/harmonics are controlled, improving the audio output, adding AGC, perhaps some mods for mobile ops as I did on the BitX40, and maybe even start fiddling with the software.

Re: uBitx VFO VFO frequency deviation 700 Hz at 80 meters; 1400 Hz at 40 meters ... #calibration #radiuno #ubitx

Evan Hand
 

I am reasonably confident that it is a calibration issue.  I have had the same issue with the two boards that I have.  I cannot help with how to calibrate a stock ubitx, other than to use the highest frequency standard that is within the ubitx frequency range.  The calibration is adjusting the base clock reference to the si5351, so if off at the low end, it gets magnified (multiplied) as you go higher in frequency.  Also, KD8CEC firmware uses this by offsetting the LO on cllock#2 as a way to attenuate the RF signal, and then the BFO adjustment to hit one of the skirts of the final crystal filter to block close in signals.  This as an example that the maladjustment of the reference and bfo can cause reduced signal reception.  They interact.

A trick that I used may work here: tune to a frequency with no signal, only white noise and use a free audio spectrum analyzer to get a "flat" signal from 500 to 2500 hertz adjusting the BFO.  I then calibrated the rig against WWV.  I did this with this free software: http://www.techmind.org/audio/specanaly.html and a USB mic connected to my computer.  It is easy with the KD8CEC memory manager.  I have not tried it with the stock calibration capabilities.  Results were same relative sensitivity as my IC-7300, and as accurate as far as I can tell.

I would try to calibrate again before doing anything else.  May also want to do the Factory Reset function prior to starting again.  I believe that is in the base software.

Above are my experiences, or interpretations thereof.  Yours may be different :)
73
Evan
AC9TU

Done for now. #ubitx

Ted
 

I think I'm in the market for someone's unbuilt or underutilized project.  Its been an adventure bordering on obsession, constructing a V4 board into a successful (1-metre length) remote-head configuration, then, trying to build the same radio into a Pelican-type case with a steel plate top surface.  Except for 40-metres, all was good with TX and the RX was happy with its added preamp and MAX9814-based AGC fudge.  It was going fine up until it wasn't.

An accidental power setting of over 27v last week smoked several components. I repaired what I thought was all of the failures, mostly some driver resistors and one pre-order transistor, by doing the 2n2222 swap & associated 22-ohm resistors for all 6 Q's in that power train. Well, it died again during tune-up.  All point measurements from Q90 to the finals are to spec. After messing with the audio path in the mean time basically cleaning up some temporary wire runs, the RX just doesn't do what it used to do.  Too much fiddling, not enough sleep between work sessions. I've spent enough in replacement Arduino Nano boards and other modification parts for this project to have picked up a Bitx-40 kit, which had been in the long range plan.

So - if anyone has a V4 or V3 board they want to part with, I'm ready to start over since everything else is working fine. Otherwise, I'll wait for a V5 kit to go to market. 

Re: CLK2 low level

vavro@...
 

Mixer looks fine, i disconnect raduino from ubitx board and there was CLK2 only 250mVpp.  I ordered new Si5351, try change it and let you know guys. 

Miroslav
OM6VM