Date   
Re: uBitx Unfiltered

Jerry Gaffke
 

Of course, the uBitx should be a clean and solid 80-10m 10W rig.
Unfortunately, v3 and v4 don't quite do that, and would require extensive mods to achieve it.
The high bands in particular are difficult.

Perhaps v5 will come closer to the ideal.

Jerry


On Sat, Sep 1, 2018 at 09:59 AM, David Posthuma wrote:

Kees & Team:

 

I know my opinion may matter little since I am not an engineer but only a Ham for 44 years. I still have and use projects I built many decades ago. And when the sunspot cycle once again peaks, many of us who are now investing into perfecting our uBitx projects will regret if 15, 12, and 10 meters are not included in the final solution.  I want to encourage your team to think long-term and so strive for the most-excellent solution possible, that we all might be proud of our radios and enjoy them for many decades to come.  

 

David A Posthuma, WD8PUO

1 (616) 283-7703

Re: uBitx Unfiltered

Kees T
 

Jerry,

I was talking about an add-on filter board between T11 and K3 with all the existing onboard parts removed to populate the new plug-in filters or just disabled. Dual relay means a relay at each end of the LPFs/BPFs the filter is either connected to the RF bus or grounded, maximum number of series contacts is 2 and they are DPDT and bifurcated. Input RF and output RF is never combined in one relay, different LPFs/BPFs are never combined in one relay.

73 Kees K5BCQ

Re: uBitx Unfiltered

 

Jerry:

 

If it did come down to requiring a version-5 ubitx, I would hope there would be some discount to those of us who purchased version 3 or 4 with the understanding that it was a 80-10 meter transceiver, not just a legal 20-meter SSB transceiver with general coverage receive from 80-10 meters. I still hope a reasonable solution can be found to salvage the current generation of uBitx transceivers.

 

David A Posthuma, WD8PUO

1 (616) 283-7703

 

From: BITX20@groups.io <BITX20@groups.io> On Behalf Of Jerry Gaffke via Groups.Io
Sent: Saturday, September 01, 2018 1:16 PM
To: BITX20@groups.io
Subject: Re: [BITX20] uBitx Unfiltered

 

Of course, the uBitx should be a clean and solid 80-10m 10W rig.
Unfortunately, v3 and v4 don't quite do that, and would require extensive mods to achieve it.
The high bands in particular are difficult.

Perhaps v5 will come closer to the ideal.

Jerry


On Sat, Sep 1, 2018 at 09:59 AM, David Posthuma wrote:

Kees & Team:

 

I know my opinion may matter little since I am not an engineer but only a Ham for 44 years. I still have and use projects I built many decades ago. And when the sunspot cycle once again peaks, many of us who are now investing into perfecting our uBitx projects will regret if 15, 12, and 10 meters are not included in the final solution.  I want to encourage your team to think long-term and so strive for the most-excellent solution possible, that we all might be proud of our radios and enjoy them for many decades to come.  

 

David A Posthuma, WD8PUO

1 (616) 283-7703

Re: uBitx Unfiltered

Kees T
 

David,

Everyone's opinion matters as we're "looking for a pony in the room". I appreciate your input and we'll get there with V3 and V4.

73 Kees K5BCQ

Re: 4.2” Nextion Bezel?

 

Chris:

 

I greatly appreciated your offer to 3-D print. I just didn’t want to put you through the trouble of having to order special materials you don’t normally carry. I’m sure I am not alone in wanting a bezel solution. So, if the group is aware that you have a solution, I think you would be of great service. Is there any place on the forum where people who offer various support-services such as this, can be easily found?

 

Thanks,

 

David A Posthuma, WD8PUO

1 (616) 283-7703

 

From: BITX20@groups.io <BITX20@groups.io> On Behalf Of Christopher Miller
Sent: Friday, August 31, 2018 10:37 PM
To: BITX20@groups.io
Subject: Re: [BITX20] 4.2” Nextion Bezel?

 

He is getting a laser cut acrylic version. I offered to print a few if he provided the material to produce the object . Instead they went with laser cut acrylic. 

Ill get s copy of that object in case it comes up again and some one is ok with white or whatever color I happen to have. 

Re: uBitx Unfiltered

 

Kees,

 

Thank you for the reassurance.

 

David A Posthuma, WD8PUO

1 (616) 283-7703

 

From: BITX20@groups.io <BITX20@groups.io> On Behalf Of Kees T
Sent: Saturday, September 01, 2018 1:51 PM
To: BITX20@groups.io
Subject: Re: [BITX20] uBitx Unfiltered

 

David,

Everyone's opinion matters as we're "looking for a pony in the room". I appreciate your input and we'll get there with V3 and V4.

73 Kees K5BCQ

Re: uBitx Unfiltered

Gordon Gibby <ggibby@...>
 

Well, it was a kit.

We all knew it was a kit.   

I thought it might’ve been a better kit, but as it was, it taught me a ton about RF amplifiers,  about filters, about mixers, and about circuitboard RF design.   

I bet I’ve gotten $600 worth of education out of it.

That was way more than I was expecting when I bought it!   I added about $12 worth of circuit board, relays etc., and I’ve got a rig that will work 80/40/30/20 pretty good.  Next on the list is one of those fancy transistors that I bought when Allyson mentioned them.  I will change out Q 90 and see what kind of power I can get then.  Change an emitter capacitor and make it a little more flat.  At that point it may do everything I want out of it.  If not, I’ve got a bunch of 2N2222 A’s to work on the driver stage.   Put a wooden box around it, and call it done!   I’ve still put many less hours into it than I put into my Heathkit HW 16.   And in 1971 I think I paid just about the same number of dollars that I had to pay for this incredible little learning tool.   Adjusted for inflation, it’s like I stole it.

If they ever find out how much good it did people like me, I hope they are magnanimous enough not to send me the bill! 


Cheers,

Gordon




On Sep 1, 2018, at 13:45, David Posthuma <davep@...> wrote:

Jerry:

 

If it did come down to requiring a version-5 ubitx, I would hope there would be some discount to those of us who purchased version 3 or 4 with the understanding that it was a 80-10 meter transceiver, not just a legal 20-meter SSB transceiver with general coverage receive from 80-10 meters. I still hope a reasonable solution can be found to salvage the current generation of uBitx transceivers.

 

David A Posthuma, WD8PUO

1 (616) 283-7703

 

From: BITX20@groups.io <BITX20@groups.io> On Behalf Of Jerry Gaffke via Groups.Io
Sent: Saturday, September 01, 2018 1:16 PM
To: BITX20@groups.io
Subject: Re: [BITX20] uBitx Unfiltered

 

Of course, the uBitx should be a clean and solid 80-10m 10W rig.
Unfortunately, v3 and v4 don't quite do that, and would require extensive mods to achieve it.
The high bands in particular are difficult.

Perhaps v5 will come closer to the ideal.

Jerry


On Sat, Sep 1, 2018 at 09:59 AM, David Posthuma wrote:

Kees & Team:

 

I know my opinion may matter little since I am not an engineer but only a Ham for 44 years. I still have and use projects I built many decades ago. And when the sunspot cycle once again peaks, many of us who are now investing into perfecting our uBitx projects will regret if 15, 12, and 10 meters are not included in the final solution.  I want to encourage your team to think long-term and so strive for the most-excellent solution possible, that we all might be proud of our radios and enjoy them for many decades to come.  

 

David A Posthuma, WD8PUO

1 (616) 283-7703

Re: CW PTT attack time to slow #ubitx

 

Allison:

 

Thank you for the clarification. One last question, then, under firmware 1.095, can I use a single input for both straight-key an keyer mode?

 

David A Posthuma, WD8PUO

1 (616) 283-7703

 

From: BITX20@groups.io <BITX20@groups.io> On Behalf Of W2CTX
Sent: Friday, August 31, 2018 10:10 PM
To: BITX20@groups.io
Subject: Re: [BITX20] CW PTT attack time to slow #ubitx

 

On w0eb.com webpage is NANO software that implements interrupt driven CW generation.  Also

eliminates the voltage divider scheme.  Also eliminates the need to switch between straight key

and paddle as both are always active.

 

rOn

 

On August 31, 2018 at 9:41 PM ajparent1/KB1GMX <kb1gmx@...> wrote:
Joop,

IF you don't mind grinding code where are many possible fixes.
I would suggest looking at V4.3 as it is a bit cleaner and more current.

The biggest issue is the software is a big loop and CW ke is checked
a few times in the loop.  Speeding up the loop is one thing.  Or making
the input interrupt driven so when there is an event it gets the processors
attention.

Allison

Re: 4.2” Nextion Bezel?

Terence Taylor
 

This is the bezel that I did for David.

Re: uBitx Unfiltered

ajparent1/kb1gmx
 

It was fun, no question, and plenty of mental exercise.  It missed the mark
for my intended use.

If my board was intact my list might be..  

External balanced mod and filter as that cleans up the carrier leakage.
I built such a thing and put it haywired in a mint tin with a crystal
oscillator dialed in as needed and got excellent result.  The circuit
was nearly in the end identical to bitx40 analog.

Mod both TX IF for no more than 11DB from the tx side of the bidi amp.

Pull the relays.  Carefully remove all the RF tracks. and DC
running under them.  Install those or replacements from the
underside and  wire it up for 80 through 20 and forget the 10M filter.
Sounds nasty but fairly trivial bunch of wires.  I put up the base circuit
for that three times.  Go dig.

Replace the 33mhz low pass with a 20mhz low pass values.  That will
take out most if not all of the lower spurs.

Edit the code to stop at 17M.  Add the needed touch ups for the now
current relay scheme for the 80 through 17M use.

Rewire RX/TX to bypass the power amp input (rewire around K1). Use K1
for DC switching only and also to remove DC short the unused line to ground.
the whole switching scheme is nuts I'd try to use KT1 for that and dump K3.
Improve bypassing and add bead chokes to power lines all over the board.

The idea is less high power wandering around the board and leave the filters
in for RX as it helps with RX birdies.  since that also means only 1 relay per
band is active it helps with power drain.

Mod the Power amp section: 
Q90 a decent part mmbt2369 or other 600mhz FT part will do as we are stopping at 18mhz.
Play with C81 for more even power 80 to 17M.

Version A, what most might do:
Replace all the 3904s with 2n2222A and lower bias foor 20ma each idling.
Reinstall the IRF510s with shorted leads possible.  Add insulator kits and real large heatsink.

Do yourself a favor hold the power to 10W or close.  Pushing the amp to max power 
just makes you a trash bucket operator as it will never be clean when doing that.
When you do that the RF gets back into other stages and creates more issues!
If you think you need more power get a used 100W radio!

Version B for those not terrified by now:
All the parts after Predriver removed.  Rewind T8 on BN61-2402  6t and 2 turn secondary #30.
Replace pre-driver 2n3904s with one 2n2219A and bias it for 25ma.  Rewind transformer
as 8 turns bifilar #28, connect as 4:1.
Get another Kitsandparts 5W CW amp, replace BD139s with IRF510 and bias network OR
get a QSX amp and be done.
Use coax (rg316) to connect from pre-driver output to amp module amp and from that amp
to the relay tree for filters.  There will be power and control wires.  

The above is an outline if you cannot think your way through it you will get over your head
fast.  Buy an appliance.  However if you build and like a challenge that is very nearly ground
up its very do able if you start with a working radio and work carefully.  Its in the land of
building from scratch and nearly a kit.  We left heathkit assembly back a while ago.

Result then is a decent 80 -17M radio.   Forget anything over 20mhz the filters before
the amp is much more difficult and otehr issues conspire to make it a mess.  We need
V5 to get that.

The plan for mine was a mil style man pack with 80/40/20/10 as primary bands (must have)
low power RX with AGC and 5-10W TX.  As work on ubitx proceeded it was obvious getting
that in the package identified was not going to fit due to added blocks to make it work
and I found the power needs rather high for something I plan to run on battery.

I will have to come up with my own design to fill that need.  I already have a breadboarded
version that needs to be size reduced to fit.  

Allison

Re: KARMA and BITX

Timothy Fidler
 

"Both men deserving"  is a as funny as hell. What  ?? Ashan F and his younger brother Ashan Farhan the second ? Please don't ban me Arv... I could not  resist it 
.

Re: VK4PP uBitx LPF BANK add-on Board

mark bodlovich
 

How did you go about adding the qrp labs filters I built mine up but haven't put them in yet. Experience is valuable in these cases. Did you remove kt1 relay and drop it in it's place?

Re: 4.2” Nextion Bezel?

MadRadioModder
 

You might be able to create a nice little business for yourself if you branch out and include the other sizes too.  There are a lot of Nextion converted radios out there now..

 

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Terence Taylor
Sent: Saturday, September 1, 2018 1:58 PM
To: BITX20@groups.io
Subject: Re: [BITX20] 4.2” Nextion Bezel?

 

This is the bezel that I did for David.


Virus-free. www.avg.com

--

…_. _._

Re: uBitx Unfiltered

Brent Seres/ VE3CUS
 

Yes, a great education for the money. I am considering Hans' low past filters and matching relay board as I have plenty of room in my box. I have no problem with a simple rotary switch to select, and I'm looking for a simple bolt on solution without butchering the board, either by just connecting to the output, or else disconnecting the existing filters, and feeding the new ones directly from the power amp. I see he also sells BPF modules. Does anyone have an opinion if these would work on TX for the band's where spurs are a problem??  It would be nice as I know many qrp tuners use the polyvaricon, and I don't see  where the trimmers should be much different at qrp, but again, I defer to others with more knowledge and experience.

Thanks and 73
Brent, VE3CUS

Re: uBitx Unfiltered

ajparent1/kb1gmx
 

Brent,

I am considering Hans' low past filters and matching relay board as I have plenty of room in my box. I have no problem with a simple rotary switch to select, and I'm looking for a simple bolt on solution without butchering the board, either by just connecting to the output, or else disconnecting the existing filters, and feeding the new ones directly from the power amp. I see he also sells BPF modules. 

IF you using external filters. disable Kt1-3 and run a coax from power amp to K3.  Use external filters.

With trivial wiring and trivial code mods you can use the Raduino  to select the filters.  Stop at 17M 
though as without band pass filters you can't clean up above 20mhz.

For band pass you have to alter (butcher) the board as it has to get before the amp.  They are
not designed to handle power.   There are other issues that makes that messy so 20mhz and
up give it a pass or build in one filter (alter the board) and use it for only one band.

Most tuners have insufficient selectivity (not their function) to suppress spurs much.   Those polyvaricon
are cheap and with both sections in parallel hit about 350pf or so.  That and they are more available then
the higher power air gaped as well as smaller.  Max power is not much over 10W depending on the 
style of the tuner.  The trimmers are meaningless.

Its one of those either get in there with a precision knife or its wishful thinking.  What I can't see is why
people fear making changes.  Its the only way to satisfy the wish/need list.


Allison

4.2” Nextion Display

Bill Robbins
 

Can someone give me a link for the best 4.2" display and associated products?

Bill

Re: VK4PP uBitx LPF BANK add-on Board

ajparent1/kb1gmx
 

For any of the low pass fitlers the easy mod is to wire around the whole built in LPG and 
save the losses.  Then put the 3rd party filters between the antenna jack and the board.

All KT1-3 do is contribute loss and consume power.  You can use the three outputs
TX-A, TXB, And TXC with software changes to control the new board or whatever then.

Allison

Re: uBitx Unfiltered

Glenn
 

Allison,  some nice do-able ideas there. I have some 82.2MHz crystal filters here and thought  that they may eliminate the issues above 20MHz? Happy to send you a pair if they help your project.

glenn

----snipped----------------------------------------------------------------------------------------------------

Result then is a decent 80 -17M radio.   Forget anything over 20mhz the filters before
the amp is much more difficult and otehr issues conspire to make it a mess.  We need
V5 to get that.

The plan for mine was a mil style man pack with 80/40/20/10 as primary bands (must have)
low power RX with AGC and 5-10W TX.  As work on ubitx proceeded it was obvious getting
that in the package identified was not going to fit due to added blocks to make it work
and I found the power needs rather high for something I plan to run on battery.

I will have to come up with my own design to fill that need.  I already have a breadboarded
version that needs to be size reduced to fit.  

Allison



On Sun, Sep 2, 2018 at 05:28 AM, ajparent1/KB1GMX wrote:
Result then is a decent 80 -17M radio.   Forget anything over 20mhz the filters before
the amp is much more difficult and otehr issues conspire to make it a mess.  We need
V5 to get that.

The plan for mine was a mil style man pack with 80/40/20/10 as primary bands (must have)
low power RX with AGC and 5-10W TX.  As work on ubitx proceeded it was obvious getting
that in the package identified was not going to fit due to added blocks to make it work
and I found the power needs rather high for something I plan to run on battery.

I will have to come up with my own design to fill that need.  I already have a breadboarded
version that needs to be size reduced to fit.  

Allison

Re: 4.2” Nextion Display

 

Bill:

This is one I used... https://www.amazon.com/gp/product/B015DMOVJA/ref=od_aui_detailpages00?ie=UTF8&psc=1.



David A Posthuma, WD8PUO
1 (616) 283-7703

-----Original Message-----
From: BITX20@groups.io <BITX20@groups.io> On Behalf Of Bill Robbins
Sent: Saturday, September 01, 2018 5:59 PM
To: BITX20@groups.io
Subject: [BITX20] 4.2” Nextion Display

Can someone give me a link for the best 4.2" display and associated products?

Bill

Re: uBitx Unfiltered

Glenn
 

These are the filters. I haven't swept them but imagine they are relatively narrow 'fm' filters.

Before anybody asks, they are no longer available from www.rockby.com.au 

glenn