Re: uBitX CW Sidetone Volume
By TX is off, I mean TX OFF from the Raduino menu. And, here is the picture... 
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Re: uBitX CW Sidetone Volume
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?
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Checkout www.w0eb.com
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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 [email protected] Notification <
[email protected] wrote:
Hello,
This email message is a notification to let you know that a file has been
uploaded to the Files area of the [email protected] 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:
/g/BITX20/files/AGC%20BITX%20UBITX/AGC%20Details.pdf
Cheers,
The Groups.io Team
|
Re: Tool Tips -- rectangular holes
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@...
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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
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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 [email protected] Notification <
> [email protected] wrote:
>
> > Hello,
> >
> > This email message is a notification to let you know that a file has been
> > uploaded to the Files area of the [email protected] 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:
> > /g/BITX20/files/AGC%20BITX%20UBITX/AGC%20Details.pdf
> >
> > Cheers,
> > The Groups.io Team
> >
> >
>
>
>
|
The only way to solve the CW issue is to get rid of the voltage divider!
r0n
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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 [email protected] Notification <
[email protected] wrote:
Hello,
This email message is a notification to let you know that a file has been
uploaded to the Files area of the [email protected] 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:
/g/BITX20/files/AGC%20BITX%20UBITX/AGC%20Details.pdf
Cheers,
The Groups.io Team
|
Re: Tool Tips -- rectangular holes
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
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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 . 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
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Tool Tips -- rectangular holes
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 .? 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
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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
Hello,
This email message is a notification to let you know that a file has been uploaded to the Files area of the [email protected]
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:
/g/BITX20/files/AGC%20BITX%20UBITX/AGC%20Details.pdf
Cheers,
The Groups.io Team
|
Re: Sunil Lakhani's AGC board connections to uBITX
#ubitx
Sorry Jim I didnt know that document existed thats the first time I've seen it.
Thanks Sunil I will have a read.
Funny thing when I looked at the circuit I was thinking of Q12 as a possible connection point..
See so I am learning circuits slowly hee hee
--
----------------------------------------------------------------------------------------------------
May the Morse be with you!
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Selling my uBITX v3.? I just don't use it enough to justify keeping it around.? Works great.? Includes: uBITIX v3 purchased last year. EF01 case with 3D printed front/back panels WITHOUT my call sign. Cooling fan in rear panel. Black spinner knob for VFO. Kees click and AGC boards assembled and installed. Wired for straight key. KD8CEC v1.08 is loaded. On/off switch and LED added to front panel Volume pot was replaced with a normal sized pot from my junkbox.? Works great. I have used this rig 99% on CW so SSB may need to be tweaked.? Kees boards are installed and work but the click kit is just "floating" inside plus some wiring needs to be shortened/cleaned up. Asking what I have in it - $160.00 plus $18.90 USPS Priority Box mail cost. Contact me at nz0tham@...?for more info/questions/offers. 73, Bill NZ0T
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Re: Sunil Lakhani's AGC board connections to uBITX
#ubitx
Perfect!? Thank you Sunil.? This is even better than the one I first saw and forgot to save.? I saved this in several places now so I won't forget it again - LOL.
73
Jim - W0EB
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Re: Sunil Lakhani's AGC board connections to uBITX
#ubitx
Here is the download link JIm
/g/BITX20/files/AGC%20BITX%20UBITX/AGC%20Details.pdf?fbclid=IwAR3gsSFpIW-WgVlFpl3Q9lQjie_gkdJpBMgKUGTwSM_vSECmRuJ3xRHH6cs
|
Hello,
This email message is a notification to let you know that a file has been uploaded to the Files area of the [email protected]
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:
/g/BITX20/files/AGC%20BITX%20UBITX/AGC%20Details.pdf
Cheers,
The Groups.io Team
|
Re: SolderSmoke Podcast #207 uBITX 15 Mtrs, 60 mtrs, homebrew, antennas, Cubesats
I have not tried at higher voltage.
With relay change the harmonics drop a lot specially in lower bands. Alsong with harmonics
the spurs drop. L5/7 change will help more but can do without.
What is critical is to keep the drive down. Target 10W on 40M and rest of the bands should be
fine. You can reduce by drive control.
Raj
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At 30-10-18, you wrote: Raj, what are the spurs like when running finals at higher voltages. 24v has been suggested.
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Re: looking for a 40M QRP SSB kit
The only way to do a Mkars80 conversion is to change the IF to? 12 Mhz and make all the corresponding changes of which there are many.? ?If you want a correct frequency display you will have to get new software from the vendor .For obvious reasons he doss not want to support potential tech idiots with no grasp on something he did not even sell them.? Some have tried to convert it with 10 M IF and is is nest of snakes.? If you don't get the software upgrade it might twork but you will have to have a look up table for the frequencies? (It uses Huf? and Puff VFO so the VFO just locks on last frequency it saw .. it does not use a rotary encoder or the like.? Be? quick.? If you look at the site it is? clear he is going to shut down production for lack o some components , in particular the? VFO? Polyvarcon.? ?It would be a VERY nice radio on 40m as it is fully engineered , not just? box of components chucked together for maximum profit? and with a switched IF and other changes , it could in? fact be an 80/40 dual band tcvr.? TEF? Oct 18 (in case this cget cut and pasted to forward).?
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Set the BFO to 11.9965 and see if that works.
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At 29-10-18, you wrote: After relay change my uBitx 4.3 is now capable for legal CW QSOs. So I did the next step and changed L5,L7 and L1 to 680 / 330 nH.
The first test on SSB via dummyload and 20db extra attenuation direct in the antenna of my good old SDR-IQ shows a rather clean signal in the RF spectrum at 10kHz width - but looking like AM and not like LSB on 3.6 MHz. Test with other stations confirmed that. The carrier is still present and the USB sideband is only 6dB down compared with LSB.
Surely the BFO must be corrected. But how? I followed the instructions, got a AM station with known frequency and set BFO to zero beat. Was then happy, to have a clean reception of all SSB stations on the QRGs where they were spotted.
73 Matthias, DD7NT
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Re: Sunil Lakhani's AGC board connections to uBITX
#ubitx
This is for the bitx 20 it goes to the base of transistor? Q2 and ground. Altering the gain at the 1st IF transistor.
Is this the board you are refering to?
I am not sure you can use that AGC board on the Ubitx instead I suggest you take a look at
and also
You dont have to fit the RFgain pot on the front panel though, you could just use the suggested AGC circuit.
Either way you will have to break into the track shown.
Hope that helps.
?
----------------------------------------------------------------------------------------------------
May the Morse be with you!
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Re: Sunil Lakhani's AGC board connections to uBITX
#ubitx
Jim?
--
John - N0CTL - Fulltime RV in a 40' motorhome
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Mark G?NMY
Jim Sheldon
Sunil Lakhani
Raj vu2zap
John Scherer