Date   

Re: uBITX Tx timeout

Howard Fidel
 

Actually it is fairly easy to modify the Raduino code to put a timer in it to turn off the xmit after some time.

On 10/31/2018 1:18 PM, Bill Cromwell wrote:
Hi Dave,

Obviously unattended operation is allowed where you live and are licensed. Some of that is allowed where I live too but the problem you have outlined is the main reason I don't do unattended operation. The remote controlled power switch that Kevin suggests looks like a good solution but you will still have to know when it needs to be used.

Good luck with it.

73,

Bill  KU8H


On 10/31/2018 02:25 AM, David - CA3DPV wrote:
Hi,

I use an old laptop for FT8 with my uBitx and works perfect (CAT via
USB). But sometimes my computer hangs (BSOD) and, when the uBitx is in
Tx, the radio keep transmitting.

I use this computer via TeamViewer, but i don't wanna fry the power
output when i'm at work and i can't power off the radio when my PC
hangs. Can i set a TOT to protect my radio? Any firmware with this feature?

73 from Santiago de Chile,

David, CA3DPV




Re: Cursed?

David Berkompas
 

I have two v4 boards that are completely deaf. Haven't spent the time yet to do any tracing.

Like you, I've put this on hold indefinitely.


Dave - AI6K


Cursed?

Woody
 

Original thread was "RX Trouble".   Sort of a rant here...

I am not superstitious but beginning to believe my uBITX (both factory & CEC firmware) is cursed. Have had issues since first power-up, but now I think the problems are fatal.  Have a lot of time & money in it (Axicom relays, trouble shooting, etc.) but think I might call it quits.  Never had problems with my scratch built rigs.  Had a problem with my K2 build, but fixed that when I discovered a copper whisker (under the coating, I took optical micrographs !) shorting a pair of runs on the control board.
However, the uBITX has been a relative nightmare.

Original issues, to name a few:
Not on frequency, low audio, poor RF sensitivity, pinched audio response (narrow - filter issue?),  very narrow tuning for understandable audio, etc.

I fixed the too low for headphones audio with an off board amplifier.  But, the distortion was even worse from the speaker. I found a power/signal driven oscillation in the external amp and fixed that.  Afterward, the volume was OK and the distortion was somewhat lower - but still not great audio.  The other problems remained.

Observation:
There was (I think, maybe) something oscillating on the board. There was a low level (~700) Hz tone on the audio coming from the board.  Found that with a 'scope, but did not find the source. Also, the 12 MHz crystal filter was rather microphonic - With no received signals lightly tapping crystals produced audio output. Normal?  Not normal?

The TX power was inconsistent with measurements by others.  Got 10 +- watts out on higher bands, dropping a bit as frequency increased.  But, for 40M and below, the power dropped to about 1.5 watts while the supply current was much higher (almost by 1 amp).   Frustrated with the RX problems, decided to look at the TX power issue using 'scope on TPs in the TX amp stages.
-- The following is when the patient died. No brain activity ;) --
CW keyed the TX for testing but I didn't get far before the fatal problem occurred. After a few short dummy load TX sessions, it stopped keying.   Immediately noticed a display issue.  The top row was all solid fill characters, nothing on the bottom row. Clocks 0, 1, 2 not there.  The 7805 on the Radiuno is supplying 5 v.  This is a bit subjective, but is does not seem to get quite as hot as initially  -  likely not supplying as much current as before?.
Hoping the cause was somehow corrupt firmware, tried reloading. Xloader appeared to connect and tried to upload, but never left the "uploading" mode - Failed to reload firmware.  The display stayed the same - solid top row, empty bottom row.
Tried uBITX Manager to read.  It appeared to connect, but when "Read from uBITX" was attempted, returned this:  "[8:30 PM] Error Receive Length = 0/1027".
OTOH,  uBITX Manager did report success when told to upload the .btx backup file I created earlier (Load from File).  BUT - it again failed the "Read from uBITX" command.  Display never changed.  I get the impression the Arduino died...

Ready to take it outside and shoot it  ;) , but probably will put this project away for now.  A big question is, if a version 5 is released to fix some of the original issues like spur/harmonic levels, do I try again ????????

Better luck to everyone else!
73,  Woody   KZ4AK


Re: Dummy Load Resistors

 

 I ordered far too many of the 1K/3W resistors for this project.  I've enough of the passive components plus D1(BAV21) for four additional builds.   I've made up four kits consisting of 20 1K/3W, 1 56k, 2 1k (don't have 2k in my box)  resistors, D1 and C1 (50V--ok for QRP, but if you want the 150W version you should replace with a 250-500V as specified).  Drop me a private email if interested. 
John
WI6P


Re: CW key in LSB mode?

Jerry Gaffke
 

Moving the BFO to the other side of the 12mhz crystal filter can make a difference,
as the skirts of the filter are shaped differently.
Also, moving the VFO to the high side (on the Bitx40) or clk1 to the high side (on the uBitx)
can have considerable impact on the birdies that the receiver sees.

Dangerous to make any blanket statements here as to what works best.
The uBitx is quite different from the Bitx40.
The various firmware releases can do different things.
What is best can also depend on what characteristics you are looking for.

Jerry, KE7ER


On Wed, Oct 31, 2018 at 12:20 PM, roger wincer wrote:
CW always uses the USB mode. Until I recently upgraded my uBitx software I had never seen a LSB CW mode. Why that was implemented I don't know. Don't bother about it no-one should ever use it.
 


Re: CW key in LSB mode?

Allard PE1NWL
 

Ty,

make sure semiQSK is ON in the SETTINGS menu.
If the radio is in LSB mode, it will switch to CW automatically as soon as you push the CW key.
(if it's in USB it will switch to CWU).
Press PTT to go back to LSB (or USB).

However when semiQSK is OFF, you need to select CWL (or CWU) manually and press PTT manually for transmitting CW.

73 Allard PE1NWL


Re: CW key in LSB mode?

roger wincer
 

Ty
CW always uses the USB mode. Until I recently upgraded my uBitx software I had never seen a LSB CW mode. Why that was implemented I don't know. Don't bother about it no-one should ever use it.

Roger ZL2RX


CW key in LSB mode?

Ed.T - aa2mz
 

Hi all,

I've had my bitx40 working for a few weeks and now have implemented the  amunters/bitx40  goodies. Thank you developers and testers!

I was surprised that nothing happened with I pushed the CW key in LSB mode... nothing happened. I expected it to switch to transmit CW on an appropriate CW offset then switch back to LSB receive. Is that not workingon my board or is it not a feature? I didn't find it looking in the code but I thought I ask more experienced operators and code gurus before I dug deeper.

TY, Ed - aa2mz


Re: Sideband rejection

Matthias Zwoch
 

Am 30.10.2018 um 06:43 schrieb Raj vu2zap:
Set the BFO to 11.9965 and see if that works.
Thanks Raj !

Had again to correct the calibration which was exactly 1 kHz off. After playing a while with Sunils calibration method I got it calibrated on 10,000.000 and then played with the BFO. Tested all BFO values from 11.995.0 to 11.996.5
The best result I got at 11,995.3 with -28 dB sideband rejection both on USB, LSB, full carrier rejection and nearly equal and good sound qualitiy on USB and LSB. The bandwidth was about 3 kHz.

73 Matthias, DD7NT


Re: uBITX Tx timeout

Bill Cromwell
 

Hi Dave,

Obviously unattended operation is allowed where you live and are licensed. Some of that is allowed where I live too but the problem you have outlined is the main reason I don't do unattended operation. The remote controlled power switch that Kevin suggests looks like a good solution but you will still have to know when it needs to be used.

Good luck with it.

73,

Bill KU8H

On 10/31/2018 02:25 AM, David - CA3DPV wrote:
Hi,

I use an old laptop for FT8 with my uBitx and works perfect (CAT via
USB). But sometimes my computer hangs (BSOD) and, when the uBitx is in
Tx, the radio keep transmitting.

I use this computer via TeamViewer, but i don't wanna fry the power
output when i'm at work and i can't power off the radio when my PC
hangs. Can i set a TOT to protect my radio? Any firmware with this feature?

73 from Santiago de Chile,

David, CA3DPV
--
bark less - wag more


Re: uBITX Tx timeout

Kevin Timm
 

Get a smart outlet (something that you can control with Echo for example) and shut the outlet off if you have a problem

Kevin 
K5KDT


On Wed, Oct 31, 2018 at 1:25 AM David - CA3DPV <david.parra@...> wrote:
Hi,

I use an old laptop for FT8 with my uBitx and works perfect (CAT via USB). But sometimes my computer hangs (BSOD) and, when the uBitx is in Tx, the radio keep transmitting.

I use this computer via TeamViewer, but i don't wanna fry the power output when i'm at work and i can't power off the radio when my PC hangs. Can i set a TOT to protect my radio? Any firmware with this feature?

73 from Santiago de Chile,

David, CA3DPV


Re: Buy in INDIA

Dexter N Muir
 

Hi Timothy

http://www.hfsignals.com/index.php/2017/11/23/bitx40-circuit-description/ - C103 , 3 pads between xtal and T4 on the PCB for the trimmer.

If those boards were an early batch (or you have modified) the diodes (2 with balance pot?) could well be mismatched. Replacing both should bring balance within the pot's ability, particularly if you measure them with an ohmmeter / DMM. Later versions had the ready-matched pair-in-one-package.
I've a dim recollection of BFO and VFO drive levels for the Bitx40 being discussed - they're adjustable in Raduino software for the uBitx and seem to make a difference.

You might find fragments of the diagram with specific modifications, but that one above is the 'master'.

Past messages in the Group give the info, as detailed on hfsignals site 'help'. Farhan has contributed here, researching his input would give the info 'from the horse's mouth' (as it were). development is ongoing in the Group, mainly for the uBitx but bits are applicable. Above all, READ. It's all in English (as here too), so our Spanish friends may encounter difficulties there - but if successful I'd encourage a translated site (a lot of other 'Latino' Hams would appreciate it!).

From hfsinals website:
If you need information specific to your shipping, billing and other commercial matters, you can drop us a mail to hfsignals’ inbox at gmail. The mailbox is in the name of hfsignals followed by the regular gmail.com.
I feel sure an email there would gain Farhjan's attention, particularly being related to a group purchase. The boards as supplied will have a hand-written number on them; quoting those numbers will identify the batch and indicate appropriate steps - with luck replacements with latest versions, though stock may be low, the uBitx being the major production now. Who knows? I know Farhan and the whole crew are very helpful.
73 de ZL2DEX


Re: Need 12.000 MHz crystals for the BITX40 #bitx40help #bitx40

MadRadioModder
 

And, of course, the Elecraft K2…

 

 

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Jim Sky
Sent: Tuesday, October 30, 2018 5:48 PM
To: BITX20@groups.io
Subject: Re: [BITX20] Need 12.000 MHz crystals for the BITX40 #bitx40 #bitx40help

 

This is the same method used in the Ten Tec Rebel. The Rebel circuit also uses voltage controlled coupling at the ends of the ladder filter.  It provides 3 distinct and surprisingly effective bandwidths using only 3 IF crystals. I have wondered if it might be used in the uBitx or Bitx 40 but have not tried it.


Jim KH6SKY

On 10/28/2018 5:44 PM, MadRadioModder wrote:

You can also use variable capacitors… or better yet varactor diodes to change the bandwidth electrically a bit:

 

 

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of KM4TRT via Groups.Io
Sent: Sunday, October 28, 2018 10:59 AM
To: BITX20@groups.io
Subject: Re: [BITX20] Need 12.000 MHz crystals for the BITX40 #bitx40 #bitx40help

 

I needed 9 crystals for a lattice filter to match within 50 hz so I bought the "grab bag" from china .  50 crystals for about 6 bucks.
I built the test oscillator from Doug Demaws, QST article and found two sets of 9 within 50 hz.
The filter seems to work well.  It's a little tight if anything.

Andy KM4TRT

 

Virus-free. www.avg.com


--

…_. _._

 


--

…_. _._


uBITX Tx timeout

David - CA3DPV
 

Hi,

I use an old laptop for FT8 with my uBitx and works perfect (CAT via USB). But sometimes my computer hangs (BSOD) and, when the uBitx is in Tx, the radio keep transmitting.

I use this computer via TeamViewer, but i don't wanna fry the power output when i'm at work and i can't power off the radio when my PC hangs. Can i set a TOT to protect my radio? Any firmware with this feature?

73 from Santiago de Chile,

David, CA3DPV


Re: Buy in INDIA

Timothy Fidler
 

DM - had to send reply this way as you have rigorous  Spam filtering on and private email was REJ . If you could tell me "the appropriate place  " where this trimmer should be put  (Well documented - as per a  piece of instruction arriving with the kit maybe ??) I will forward it on to him.

he is about to bundle the Bitx40  kit as Repaired by Him  so it can receive and sent it back to the buyer in Spain and tell the original buyer (of a whole set of them)  what he is working on is mostly  a crock.  He is fed  up with spending time. on it as it was a  mess in terms of performance as it came out of box. I have seen his wiring photos and it all looks nicely done and heat shrunk.  He was using the screen of  a KX3 as a spectrum analyser to diagnose things. so he is not some plumber trying to do RF wiring .  How can anyone solve problems if the on the web schematic is not up do date on this diode change out bizzo ?   Perhaps it is.. perhaps there are Multiple master schematics floating around ?? "you get that on the Cloud."
 
If you forward technical insights with specific URLs,  I will forward them.  
 
It is possible that the diode pair he has is defective or that it is a mixture of  silicon and schottky.  Such assymetric pairs  are made for use as PIN diodes;  what is to stop them getting onto the assly line in Mumbai. ?  All the evidence is that the diodes are being over powered in TX ;  it now works in RX ie at low diode forward current  with a MAJOR user rework.   since the diodes  were feeding into a CT 500R load with Pi downstream before the change  .. Do you know what changes were made on the Tx  amp section prior to BM section to ensure  diodes stayed in   A exp (I)    functional range - which is required for a diode based modulator to work ??
 

Timothy E. Fidler : Engineer BE Mech(1) Auckland , NDT specialist AINDT UT /RT3 , MT2 CB #2885, 
Telephone Whangarei   022  691 8405
e: Engstr@...

 



----- Original Message -----
From:
"Dexter N Muir" <dexy@...>
 


Re: Mike element

Dennis Yancey
 

Labtec makes a good computer mic that does a good job on the ubitx. I have 2 of them. Also, I had a avalier mic that I bought sometime back from China for $1.99. It works good though not quite the output of the lab tech. Another alternative is to use a mic pre amp. John, vk2Eta did that and wrote it up on the HHSignals site. Those pre amps are cheap. He integrated it to the uBitx. You could make it a stand-alone power mic, like d-104 or Turner SuperSidekick only with electret element instead of dynamic. 

If the obstacle in front of you is too high to jump, dig a tunnel or go around..

--
72 and God bless
KD4EPG


Re: Need 12.000 MHz crystals for the BITX40 #bitx40help #bitx40

Jim Sky
 

This is the same method used in the Ten Tec Rebel. The Rebel circuit also uses voltage controlled coupling at the ends of the ladder filter.  It provides 3 distinct and surprisingly effective bandwidths using only 3 IF crystals. I have wondered if it might be used in the uBitx or Bitx 40 but have not tried it.


Jim KH6SKY

On 10/28/2018 5:44 PM, MadRadioModder wrote:

You can also use variable capacitors… or better yet varactor diodes to change the bandwidth electrically a bit:

 

 

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of KM4TRT via Groups.Io
Sent: Sunday, October 28, 2018 10:59 AM
To: BITX20@groups.io
Subject: Re: [BITX20] Need 12.000 MHz crystals for the BITX40 #bitx40 #bitx40help

 

I needed 9 crystals for a lattice filter to match within 50 hz so I bought the "grab bag" from china .  50 crystals for about 6 bucks.
I built the test oscillator from Doug Demaws, QST article and found two sets of 9 within 50 hz.
The filter seems to work well.  It's a little tight if anything.

Andy KM4TRT


Virus-free. www.avg.com

--

…_. _._



Re: uBitX CW Sidetone Volume

Marko Pavlicevic
 

By TX is off, I mean TX OFF from the Raduino menu.


And, here is the picture...


Re: uBitX CW Sidetone Volume

Marko Pavlicevic
 

Disconnected main pot and applied CW TONE direct to amplifier (R253 direct to VOL-M).
Now, CW tone can be lowered (with pot across C252) and there is no bumping sound.

So, when TX is off, and you remove R253 from the circuit, you can still somehow hear CW tone, that comes from Q70.
How is that possible?


Re: New file uploaded to BITX20@groups.io + CW Keying

W2CTX
 

Checkout www.w0eb.com

On October 30, 2018 at 1:11 PM barry halterman <kthreebo@...> wrote:


I have the E divider out and still does not help. I went over to a stand
alone keyer to see if I still had the issue, which I did. Only way around
this is push the ptt and put the rig in transmit, then QRQ.
Thanks for reply
K3BO

On Tue, Oct 30, 2018, 12:49 PM W2CTX <w2ctx@... wrote:

The only way to solve the CW issue is to get rid of the voltage divider!

r0n

On October 30, 2018 at 11:31 AM barry halterman <kthreebo@...>
wrote:


I am having a keying issue with my ubitx v4, with CEC 1.08. On cw around
20
to 25 wpm, the first dit does not transmit, like sending an "R"..dit dah
dit. The first dit engages the change over from rx to tx but the dit is
not
transmitted...the dah and dit are. Seems to me a latency issue with the
raduino. Any ideas?
Thanks
K3BO

On Tue, Oct 30, 2018, 3:22 AM BITX20@groups.io Notification <
BITX20+notification@groups.io wrote:

Hello,

This email message is a notification to let you know that a file has
been
uploaded to the Files area of the BITX20@groups.io group.

*File:* AGC Details.pdf

*Uploaded By:* Sunil Lakhani

*Description:*
LM324 AGC with Analogue VU Meter works for bitx and ubitx .

You can access this file at the URL:
https://groups.io/g/BITX20/files/AGC%20BITX%20UBITX/AGC%20Details.pdf

Cheers,
The Groups.io Team