Date   
Re: New file uploaded to BITX20@groups.io

barry halterman
 

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

Tool Tips -- rectangular holes

Jon Titus, KZ1G <tituskz1g@...>
 

Perhaps a bit off topic, but here goes...
In a recent post, looking for a 40M QRP SSB kit, Fred (K3TXW) explained, "...I have problems making a rectangular hole in a piece of aluminum of exactly the right size, with the edges exactly parallel to the edges of the case. I inevitably make the opening too big or slightly wavy. The result screams "homebrew carelessness" though I'm not careless. Maybe there is a rectangular punch or something to do this right, but I don't have such a tool; I use a set of files."

In addition to files for work on front panel fabrication, I recommend an electronics shop include:

1.  A drill press with a chuck that will accept 0.50-in.-diameter bits.  Harbor Freight sells a couple of bench-top units for under $100.  Put a magnet on the base as a place to keep the chuck wrench.  (It's usually best to clamp work to the drill press table.)  Once you have a drill press you'll find many other jobs for it.
2.  A good set of sharp drill bits.  Bits with a titanium nitride coating remain sharp for a long time.
3.  A step drill bit.  I use an Irwin Tools Unibit 3/16-Inch to 7/8-Inch Step-Drill Bit with a 3/8-Inch shank.  Great tool when you need to make larger holes for controls or to start a rectangular cutout.
4
.  An Adel-brand metal nibbler.  They show up on Ebay.  Or buy a new one at https://www.adelnibbler.com.  I've used one since I was a teenager and couldn't work on chassis or panels without it.

Lay out your hole with masking tape around the outside.  To make a rectangular hole (see attached image) I use a step bit and smaller bits to make round holes that remove a lot of metal.  Just don't get too close to the rectangle's edges.  Next I use the nibbler to remove remaining metal close to, but not at, the rectangle edges.  Finally I clamp the panel or chassis in a bench vise so an edge of the hole aligns with the top of the vise jaws.  File away any remaining metal until the edge is parallel with the vise jaws.


--
Jon Titus, KZ1G
Herriman, UT USA

Re: Tool Tips -- rectangular holes

Bill Cromwell
 

Hi John,

I hide imperfections around a rectangular hole in the front panel with a bezel. Those will hide a lot of sins. They are also easier to fabricate with straight, clean edges. Riy=ugh edges that might show a little on internal panels of chassis - who cares.

Your use of the bench vise to keep the edge straight during filing is good but will eventually damage the vise. I use a sacrificial piece of steel like a piece of angle iron clamped up along with the workpiece. In woodworking we call that a "fence".

73,

Bill KU8H

On 10/30/2018 11:50 AM, Jon Titus, KZ1G wrote:
Perhaps a bit off topic, but here goes...
In a recent post, /looking for a 40M QRP SSB kit/, Fred (K3TXW)
explained, "...I have problems making a rectangular hole in a piece of
aluminum of exactly the right size, with the edges exactly parallel to
the edges of the case. I inevitably make the opening too big or slightly
wavy. The result screams "homebrew carelessness" though I'm not
careless. Maybe there is a rectangular punch or something to do this
right, but I don't have such a tool; I use a set of files."

In addition to files for work on front panel fabrication, I recommend an
electronics shop include:

1. A drill press with a chuck that will accept 0.50-in.-diameter bits.
Harbor Freight sells a couple of bench-top units for under $100. Put a
magnet on the base as a place to keep the chuck wrench. (It's usually
best to clamp work to the drill press table.) Once you have a drill
press you'll find many other jobs for it.
2. A good set of /sharp/ drill bits. Bits with a titanium nitride
coating remain sharp for a long time.
3. A step drill bit. I use an Irwin Tools /Unibit/ 3/16-Inch to
7/8-Inch Step-Drill Bit with a 3/8-Inch shank. Great tool when you need
to make larger holes for controls or to start a rectangular cutout.
4. An Adel-brand metal nibbler. They show up on Ebay. Or buy a new
one at https://www.adelnibbler.com. I've used one since I was a
teenager and couldn't work on chassis or panels without it.

Lay out your hole with masking tape around the outside. To make a
rectangular hole (see attached image) I use a step bit and smaller bits
to make round holes that remove a lot of metal. Just don't get too
close to the rectangle's edges. Next I use the nibbler to remove
remaining metal close to, but not at, the rectangle edges. Finally I
clamp the panel or chassis in a bench vise so an edge of the hole aligns
with the top of the vise jaws. File away any remaining metal until the
edge is parallel with the vise jaws.


--
Jon Titus, KZ1G
Herriman, UT USA
--
bark less - wag more

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

W2CTX
 

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


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

barry halterman
 

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
> >
> >
>
>
>



Re: Mike element

sridhar
 

Can y provide us the link to buy


On Sun, 28 Oct 2018, 1:42 am Frank Dinger , EI7KS, <ei7ks.frank@...> wrote:
Chinese on-line retailers sell electrets with external amplifier on a 15x20mm board complete with separate 5 pin header.  This unit seem to be very effective for BITX radios.  Past week  I received 2 pcs .

Frank  ,  EI7KS

Re: Tool Tips -- rectangular holes

Kevin Luxford
 

I clamp a short length of angle iron along the line of the opening, and file to that. Gives nice straight line. Rectangular chassis punches are available but are verra costly, and the larger ones require lots of force, and may need an hydraulic press. FWIW. 73 Kevin VK3DAP / ZL2DAP


--
Kevin B. G. Luxford
kbgluxford@...

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





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: uBitX CW Sidetone Volume

Marko Pavlicevic
 

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


And, here is the picture...

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: 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: 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@...>
 

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: 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


--

…_. _._

 


--

…_. _._

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: 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: 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: 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

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