Date   
Re: Should we adopt the KD8CEC firmware?

G1KQH
 

I have followed all the KD8CEC uBITX sketch videos from the begining ( I do wish Dr Lee would put some sound guidance into these videos). There is a lot in the sketch that many of us still don't understand, so I would prefer an offical factory version release, but still keep the option there for the "original" VU2ESE sketch made available if folk ever feel the need to hop back.

( I am also with you on General Coverage Asharr, maybe a switch between the two options?) can anymore be squeezed in?

Horses for courses you can never make everyone happy, some will like parts of the original sketch (like me) some will like others input. But I accept that KD8CEC has done a excellent job. We must also not forget Jack's input and Allard too..


73 Steve

G1KQH
 

Re: uBITXII

VE7CWS WRSeiler <waltrseiler@...>
 

Dave

perhaps I should have said drive level, reports I got have been that the audio is narrow in frequency response

Walt VE7CWS

Re: uBITXII

Ashhar Farhan
 

The narrow audio response is either a crystal filter bandwidth issue or the bfo setting.
The new firmware that we are talking about does NOT entail any hardware changes. It fixes things that are broken in the original software or they are poorly implemented. 
For instance, the cw keying with a straight key is so broken that i swear i want to kill the programmer. The accelerated tuning rate alogirthm jumps very arbitrarily, CAT doesnt work. I can list many. 
- f

On 13 May 2018 4:30 pm, "VE7CWS WRSeiler" <waltrseiler@...> wrote:
Dave

perhaps I should have said drive level, reports I got have been that the audio is narrow in frequency response

Walt VE7CWS


Re: boosting the power on 28 MHz #ubitx

Tim Gorman
 

Bill

Thanks. Sounds like something I might want to try next time I have the
mainboard out of the case.

tim ab0wr

On Sat, 12 May 2018 21:58:57 -0500
"K9HZ" <@Doc_Bill> wrote:

Yes it does increase the output across the entire spectrum, but
mostly above 18 MHz, and it is greatest at 28 MHz . It cancels some
inductance at higher frequencies that is problematic. I see a
maximum of 26 watts on 40 meters and 19 watts on 10 meters... you can
easily dial that back with RV1 accordingly.


Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ
PJ2/K9HZ

Owner - Operator
Big Signal Ranch – K9ZC
Staunton, Illinois

Owner – Operator
Villa Grand Piton – J68HZ
Soufriere, St. Lucia W.I.
Rent it: www.VillaGrandPiton.com
Like us on Facebook!

Moderator – North American QRO Group at Groups.IO.

email: @Doc_Bill



-----Original Message-----
From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Tim
Gorman Sent: Saturday, May 12, 2018 6:59 PM
To: BITX20@groups.io
Subject: Re: [BITX20] boosting the power on 28 MHz #ubitx

Does the cap provide output leveling or increased output from 80m to
10m?

I mainly operate 80m, 40m, and a little 20m. The output there seems
to be fine for what I do.

tim ab0wr

On Sat, 12 May 2018 16:56:57 -0500
"K9HZ" <@Doc_Bill> wrote:

I just put mine at the base of T11 but there are many ways of doing
it depending the type of part you use... I also replaced T11 but
let's not go there yet.


Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ
PJ2/K9HZ

Owner - Operator
Big Signal Ranch – K9ZC
Staunton, Illinois

Owner – Operator
Villa Grand Piton – J68HZ
Soufriere, St. Lucia W.I.
Rent it: www.VillaGrandPiton.com
Like us on Facebook!

Moderator – North American QRO Group at Groups.IO.

email: @Doc_Bill



-----Original Message-----
From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Tim
Gorman Sent: Saturday, May 12, 2018 4:31 PM
To: BITX20@groups.io
Subject: Re: [BITX20] boosting the power on 28 MHz #ubitx

How do you recommend doing that? A disc ceramic between IRF510 pins?
Can you get an smd cap between the pins on the bottom of the ckt
board?

tim ab0wr

On Sat, 12 May 2018 13:38:52 -0500
"K9HZ" <@Doc_Bill> wrote:

Did you try putting about 330pf across the primary of T11 (PA
output transformer). That will make a big difference...


Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ
PJ2/K9HZ

Owner - Operator
Big Signal Ranch – K9ZC
Staunton, Illinois

Owner – Operator
Villa Grand Piton – J68HZ
Soufriere, St. Lucia W.I.
Rent it: www.VillaGrandPiton.com
Like us on Facebook!

Moderator – North American QRO Group at Groups.IO.

email: @Doc_Bill



-----Original Message-----
From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of
Skip Davis via Groups.Io Sent: Saturday, May 12, 2018 1:27 PM
To: BITX20@groups.io
Subject: Re: [BITX20] boosting the power on 28 MHz #ubitx

Allison I tried the 220pf cap on RV1 and didn’t see any gain at
28 MHZ. I also tried removing the feedback resistors in the
finals suggested by Farhan without any gain. What I also have
done was the capacitor/choke mod suggested by Howard for the
driver stages and that has worked. With RV1 set to 10 watts on 40
meters I now get about 2.5 watts on 28 MHZ up from the 1.25 - 1.5
watts before. I also see about 8 or 9 watts on 20 meters. I’m
running Ian’s firmware I think version 1.06 something.

Skip Davis, NC9O




---
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Re: Buyer beware! RD16HHF1

ulf.jagfors@...
 

In Europe MRF510 can be bought from Conrad electronics, brand Vishy, for 50 cent plus shipping.
Unfortunately they do not offer RD16.

Re: Are the uBITX receivers ripe for improvement? -- And some other miscellaneous thoughts.

Tim Gorman
 

On 80m/40m/20m the ubitx receives as well as my FTDX3000. Those bands,
esp 80m/40m, are noise limited not sensitivity limited. The 3000, of
course, has more filter options which helps control received noise.
However, an audio filter with a peak mode significantly helps the
ubitx on cw.

On the higher bands a pre-amp might help. That can be added in the
receive path just like nd6t's agc circuit and can be switched in and
out at need.

tim ab0wr

On Sat, 12 May 2018 20:10:06 -0700
"Tom, wb6b" <wb6b@...> wrote:

I see a lot of good conversations here about improving the uBITX
transmitter output. However, I see very little about how good the
receiver is. My question is, have many people done comparisons of the
uBITX receiver vs their other radios; particularly on SSB?

 

In my case I have noticed that my SDR using a cheap dongle seems to
outperform the uBITX receiver substantially. Even though I don’t
consider the SDR dongles to be the pinnacle of RF design, I guess
throwing brute force real time math at the receiver side makes up for
some of it.

 

Are the uBITX receivers ripe for improvement?

 

Re: uBITX narrow IF filter mod for CW, anyone tried this?

Mark Kesner
 

I used the same NESCAF filter and am very happy with it.  I have not tried it on contest conditions yet but for casual operation it has given a big improvement.  

Mark
KC4GIA 

Re: Tx doesn’t transmit nor rx off

Tim Gorman
 

If you aren't seeing any power drain and you are still in receive then
the first place to start is at K1. Check the voltage at the base of Q15
to see if it changes when you press the PTT. If it does then your K1
may not be operating correctly.

tim ab0wr

On Sun, 13 May 2018 02:35:10 -0700
César EA3IAV <Cesarleon@...> wrote:

Hi guys.
When I press ptt i see tx on the screen but sound does not turn off
and i see no power drain or power out on my meter wiring is fine on
the mic. Where woukd you start from to find the culprit? it seems
that components are crappy enough to have you fixing this piece of
all ... the rest of your life

Re: uBITXII

richcarter03052 <re.carter@...>
 

I built a fully featured Elecraft K2 a few years back.  It has a variable bandwidth crystal ladder filter.  I wonder if the uBitx filter can be adapted to vary it's bandwidth in a similar fashion, perhaps with an external pot rather than under processor control.

There are a number of threads that describe mods to the uBitx.  It's getting a bit tedious to hunt through threads to find tested and verified mods.  It would be nice if they were collected in one place.

Rig operation is awkward due to the lack of frontpanel controls.  It would be nice if there were a computer interface and cat software available.  The new enclosure provides an external board with serial and USB connectors, but no instructions on how to hook these up and what they can do.  If anyone figures this out, please respond.

Rich - KE1EV

Re: Are the uBITX receivers ripe for improvement? -- And some other miscellaneous thoughts.

richcarter03052 <re.carter@...>
 

I hooked up a calibrated signal source and verified that I can receive a 1uv signal on all bands.  This is consistent with performance of most modern rigs.  I find the rig a bit difficult to tune however, possibly due to an SSB filter that is too wide.

Rich - KE1EV

Re: uBITXII

Doug W
 

On Sun, May 13, 2018 at 06:22 am, richcarter03052 wrote:
There are a number of threads that describe mods to the uBitx.  It's getting a bit tedious to hunt through threads to find tested and verified mods.  It would be nice if they were collected in one place.
There is such a place. ZL1AXG puts in about 23 hours a day at http://ubitx.net/

It would be nice if there were a computer interface and cat software available.
look for KD8CEC on the link above



 
--
www.bitxmap.com

Re: Buyer beware! RD16HHF1

f1apy - Jacques
 

Hello,

In Europe, you can order to https://sdr-kits.net/index.php?route=web/pages&page_id=55_55

but this is not the price of an IRF510 hi !

73’s Jacques –F1APY

Re: My ubitx installed in Inkit black enclosure for sale

noel ramos <noelacramos@...>
 

Sold! Thank you!

Re: Should we adopt the KD8CEC firmware?

Rod Davis
 

Hi Norm,

if you go to http://ubitx.net/

about the 7th line down, click on manual.

Rod KM6SN


On 05/12/2018 07:37 PM, marjannorm wrote:
Hi Mike,
where can I get hold of Ian's manual?   Can you please direct me to the url?
thanks
Norm vk5gi
McLaren Vale
South Australia

Re: uBITXII

K9HZ <bill@...>
 

You might try www.hfsignals.net  Most of the mods are listed there concisely by type and author.

 

 

Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ

 

Owner - Operator

Big Signal Ranch – K9ZC

Staunton, Illinois

 

Owner – Operator

Villa Grand Piton – J68HZ

Soufriere, St. Lucia W.I.

Rent it: www.VillaGrandPiton.com

Like us on Facebook! facebook icon

 

Moderator – North American QRO Group at Groups.IO.

 

email:  bill@...

 

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of richcarter03052
Sent: Sunday, May 13, 2018 8:22 AM
To: BITX20@groups.io
Subject: Re: [BITX20] uBITXII

 

I built a fully featured Elecraft K2 a few years back.  It has a variable bandwidth crystal ladder filter.  I wonder if the uBitx filter can be adapted to vary it's bandwidth in a similar fashion, perhaps with an external pot rather than under processor control.

There are a number of threads that describe mods to the uBitx.  It's getting a bit tedious to hunt through threads to find tested and verified mods.  It would be nice if they were collected in one place.

Rig operation is awkward due to the lack of frontpanel controls.  It would be nice if there were a computer interface and cat software available.  The new enclosure provides an external board with serial and USB connectors, but no instructions on how to hook these up and what they can do.  If anyone figures this out, please respond.

Rich - KE1EV


Virus-free. www.avg.com

Re: uBITXII

K9HZ <bill@...>
 

Sorry too early in the AM for me evidently… uBITx.net as others have pointed out.

 

 

Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ

 

Owner - Operator

Big Signal Ranch – K9ZC

Staunton, Illinois

 

Owner – Operator

Villa Grand Piton – J68HZ

Soufriere, St. Lucia W.I.

Rent it: www.VillaGrandPiton.com

Like us on Facebook! facebook icon

 

Moderator – North American QRO Group at Groups.IO.

 

email:  bill@...

 

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of K9HZ
Sent: Sunday, May 13, 2018 9:48 AM
To: BITX20@groups.io
Subject: Re: [BITX20] uBITXII

 

You might try www.hfsignals.net  Most of the mods are listed there concisely by type and author.

 

 

Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ

 

Owner - Operator

Big Signal Ranch – K9ZC

Staunton, Illinois

 

Owner – Operator

Villa Grand Piton – J68HZ

Soufriere, St. Lucia W.I.

Rent it: www.VillaGrandPiton.com

Like us on Facebook! facebook icon

 

Moderator – North American QRO Group at Groups.IO.

 

email:  bill@...

 

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of richcarter03052
Sent: Sunday, May 13, 2018 8:22 AM
To: BITX20@groups.io
Subject: Re: [BITX20] uBITXII

 

I built a fully featured Elecraft K2 a few years back.  It has a variable bandwidth crystal ladder filter.  I wonder if the uBitx filter can be adapted to vary it's bandwidth in a similar fashion, perhaps with an external pot rather than under processor control.

There are a number of threads that describe mods to the uBitx.  It's getting a bit tedious to hunt through threads to find tested and verified mods.  It would be nice if they were collected in one place.

Rig operation is awkward due to the lack of frontpanel controls.  It would be nice if there were a computer interface and cat software available.  The new enclosure provides an external board with serial and USB connectors, but no instructions on how to hook these up and what they can do.  If anyone figures this out, please respond.

Rich - KE1EV

 

Virus-free. www.avg.com

Re: Buyer beware! RD16HHF1

William Cullison
 

I have checked all domestic sources of RD16HHF1 and for a quantity of 4, Polida2008 beats them all for price. They will get my order. Thanks for the recommendation.



On Sat, May 12, 2018 at 2:07 PM, ajparent1/KB1GMX <kb1gmx@...> wrote:
The only fet type that can be symmetrical where drainoor source is interchangeable is junction fet
and even then not all.

Mosfets be they hexfet type (IRF510) or LDMOS (RD16hhf) are very asymmetric. Further they have
a source to drain diode and some even have a zener diode from gate to source.

If the part does not have the source lead bonded to the tab its not an RD16HHF or flavor of.

I do not buy parts on ebay, I have extreme distrust.  there are plenty of vendors that sell
parts that I don't require paypal and are considered quality vendors.  

Allison


Re: uBITX drive level.. #ubitx

docame12@...
 

Hi Jerry,

What do you mean by "Be very careful about setting those pots to "a lot more" than 100ma, 
that's a good way to make the IRF510's pop from the heat." What's  a lot more? I found I needed to adjust my bias to 150mA each just to get the PO to be on par with most others. By your formula above I would get  12v*0.150A=1.8 watt. Am I correct? 

Do you - or anyone here - have suggested maximum bias mA's? (BTW, I have a rather large computer cabinet fan that I salvaged and blow directly on the PAs.}

Thanks!
Dave, WS1ETI

Re: uBITXII

jim
 



On Sunday, May 13, 2018, 6:22:30 AM PDT, richcarter03052 <re.carter@...> wrote:


I built a fully featured Elecraft K2 a few years back.  It has a variable bandwidth crystal ladder filter.  I wonder if the uBitx filter can be adapted to vary it's bandwidth in a similar fashion, perhaps with an external pot rather than under processor control.

I,too have a k2 ...the diode used is a type 1sv149 500pf@1 volt to 20pf@ 7 volts ...been looking at that contemplating a test mod to see what happens for a while ...

Jim

Re: Buyer beware! RD16HHF1

kevintg51@...