Date   
Re: ND6T AGC and Click kit wiring notes

Richard Spohn
 

Nick, would like to obtain 2-3 of your AGC PCB boards. If you are
planning a kit with parts, I can wait for that too. - Rich WB2GXM

On 8/1/18, Nick VK4PLN <nickpullen@...> wrote:
On Thu, Aug 2, 2018 at 06:36 AM, Kees T wrote:


I'm going to quit and pass the torch to someone else. Order rates have
dropped off some, so maybe everyone who wanted a mini-kit has one ??
HI Kees K5BCQ,  Don, ND6T
Would it be OK for me to use this design to produce and supply blank boards
to the ubitx community? I will do these at cost price...

Cheers.
73 Nick VK4PLN



Re: ND6T AGC and Click kit wiring notes

Kevin Rea
 

Hello, do you know if you have possibly shipped my unit?
Kevin Rea

Re: ND6T AGC and Click kit wiring notes

Nick VK4PP
 

HI Again,
Just PCB boards. I am still designing them, and awaiting a new callsign too, so, I am hopin in the next week or so to get all my current board designs finalised and then place and order.

One more pic of the VK4PLN ND6T AGC board:


73 Nick VK4PLN

Re: any tips for debugging RFI issue? #ubitx-help

 

Hi Allison,

I need to redeploy that antenna, I have the feed point at the same level as the far end and the wrong coax on it, so I know it's my fault it doesn't perform any better than it does. I threw it up in the air about 5 years ago and am just too lazy to take it down and do it right, I'm too busy building radios:-). This fall when the forest fire smoke clears I'll do it.

Joel
N6ALT

Re: any tips for debugging RFI issue? #ubitx-help

ajparent1/KB1GMX
 

I was wondering how close those fires were.  The rule here if if you smell the smoke
its too close.  Take care.  Keep building!

Allison

Re: ND6T AGC and Click kit wiring notes

Nick VK4PP
 

Hi Again.

Would folks prefer the Pot to adgjust the ACG or the Jumpers as per Kees' boards?

I am in 2 minds about it,,,

73 Nick. VK4PLN

Re: ND6T AGC and Click kit wiring notes

Kevin Rea
 

never mind.. i just received it today.

thanks,
kevin rea

nextion 3.2" display question..

Kevin Rea
 

hi guys,
what is the battery holder for on the nextion display ??
something we need ?

kevin rea
lancaster, calif.
k6rea

Re: nextion 3.2" display question..

AC0AX
 

Its for the Real time clock. its not needed for now. if someone implements it in the firmware then it could be used.

Re: nextion 3.2" display question..

Kevin Rea
 

OH,, ok..thanks.

 

Kevin

 

 

From: BITX20@groups.io <BITX20@groups.io> On Behalf Of AC0AX
Sent: Thursday, August 2, 2018 5:03 PM
To: BITX20@groups.io
Subject: Re: [BITX20] nextion 3.2" display question..

 

Its for the Real time clock. its not needed for now. if someone implements it in the firmware then it could be used.

Re: Tinny sounding electric miss on uBitx

Timothy Fidler
 

Jack it is not a problem - it's  FEATURE ! But if you were setting this up on a system which has to swap USB/LSB between 40 m and 20m, which yours will since you are uBitx ..  I suggest you need to check it  works on USB after you have done the cludge ie on 20m as it is clear to me you are talking LSB operation and thusly 40 or 80 for your fix.. I kind of see probos ahead,  unless the firmware is incredibly smart.  


Let's face it though at the price it sells for the Cohn filter sets are not going to all be exactly on 12.0000 Mhz.  If you talk nicely to Leon at Ozqrp and offer him what he wants for matching and ship him say 12 HC 49U full hght xtals for matching you might be able to correct the problem.  But you need to get an indep and traceable calibration frequ counter on the BFO and get a second opinion as to if it is the BFO or the xtal filter set... just my tuppence worth....

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



----- Original Message -----
From:
BITX20@groups.io

To:
<BITX20@groups.io>
Cc:

Sent:
Thu, 02 Aug 2018 15:08:57 -0700
Subject:
Re: [BITX20] Tinny sounding electric miss on uBitx


I know this is an old thread, but I wanted to say thank you to everyone involved.  My BFO was set to 11.995.250.  If I went 1 kHz away people were loud by tinny.  If I went on frequency, they were soft but sounded right.  I set it to 11.996.100 and everything sounds wonderful!

Jack
KG4GJY

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Re: Tinny sounding electric miss on uBitx

Timothy Fidler
 

Sorry . brain fade.. invert the answer. Jack clearly had to set the BFO way Low to select USB so it would pass the Cohn filter which appears to have its passband low on 12.0000 but the issue still remains.. does the uBitx work correctly on a frequency that uses LSB such as 40m. I would guess not unless the firmware was utterly bullet proof Mil Spec. Re comment on LEon.. He may refuse the work as he deals only with 10 Meg IFs on the kits he sells. AND you would need to put the squeeze on someone you know with a a Hot air chip removal station for  SMD to remove all the affected crystals if the kit refuses to work properly on both sides of the IF. sometimes you may have to put up with something with limited functionality than the worst case outcome....

Re: hacking bitx40 for 20 metre #bitx40

Ryan Flowers
 

Terry, I did this. I also changed the PA FET for a RD15HVF1 because it worked a lot better on 20m than the IRF510. Info on both here:

http://miscdotgeek.com/converting-bitx40-20m/

https://www.youtube.com/watch?v=-1u-cANWMTM

--
Ryan Flowers - W7RLF
MiscDotGeek.com
Multi Band BITX40
The BITX40 FAQ

Re: hacking bitx40 for 20 metre #bitx40

ajparent1/KB1GMX
 

IRF510 at 20M is not an issue or even working hard. 

I have several radios that really work on that band using that critter.
Bitx20 (V0) from the early years, uBitxV3,  Slopbucket 20 a Kd1JV design.  Never
minding a 10M radio that just got an upgrade from 2sc1307 to IRF510 (went from
5W to 12), a 160 to 10M amp using them (WA2EBY).   

Makes me ask what's wrong? 

Allison

Re: ND6T AGC and Click kit wiring notes

Scott McDonald
 

Both if it’s easy?😳

72 Scott ka9p

Make something good happen!

On Aug 2, 2018, at 6:37 PM, Nick VK4PLN <nickpullen@...> wrote:

Hi Again.

Would folks prefer the Pot to adgjust the ACG or the Jumpers as per Kees' boards?

I am in 2 minds about it,,,

73 Nick. VK4PLN

Re: any tips for debugging RFI issue? #ubitx-help

Mike KK7ER
 

Allison,

Thanks for all the suggestions!  Regarding your points:
  • I do not have a star washer at the coax connector on the uBITX.  Nor do I have star washers under the mounting posts.  I'll give that a try.
  • The matching box is this one:  https://www.ebay.com/itm/191226640113
  • There was no manual but the seller pointed me to this page:  http://udel.edu/~mm/ham/randomWire/  I had 100ft of wire and wanted to use 40m-10m so I cut it in two to make a 39ft piece and a 61ft piece.  Both those lengths fit the 40m-10m range in the colorful table on that web page.  I started with the 39ft one at first then switched to the 61ft piece.
  • The SWR is 1:1 at the desired frequency of 14.074 MHz.
  • FYI, I'm in a townhouse.  The 25ft coax goes through the wall up into the attic and through the soffit to the matching box hidden under the eave (about 20 feet above ground).  The antenna wire runs under the eave south for about 13 feet, makes a 100 degree turn West and slopes downward with the end of the wire being about 10 feet above the ground.
  • I had a ferrite on the power cable (you can almost see it in the photo) and tried building and inserting an air choke where the cable came out of the wall.  But if the coax is radiating that badly then the part beyond the air choke inside the wall 2 feet from the uBITX likely renders that moot.
  • Would installing the air choke at the matching box be an option?  It would mean just a few inches of counterpoise/coax before the air choke.
  • Would installing the 31 feet of extra wire on the counterpoise side help?
Thanks again!

73 Mike KK7ER

Re: Tinny sounding electric miss on uBitx

ajparent1/KB1GMX
 

OK, we have a lot of misunderstanding here...  uBitx.

If the master osc is not set on frequency everything else is likely to be off frequency and work poorly.

The filter is ladder filter (not a Cohn) and like all ladderfilters due to the parallel caps are loaded to
the lower frequency.  so technically it is a filter of about 2.1Khz with a center frequency a of
11.9989mhz built with nominal 12mhz crystals.   From here out we call it a 12mhz filter as 
11.99989 is just longer! ;)

Also the default startup setting for the software uncalibrated is 11.995 (at least 1khz too low).

The IF filter 12mhz has a roughly 2.1khz pass band with the upper edge just below 12mhz
and the bottom ends around 11.997ish  Small errors in BFO placement (100hz) is enough to
impact audio quality both RX and TX.   FYI OSC-0 is the BFO.   In mine the magic number was
11.996750mhz.  NOTE: the BFO is not changed to change sideband.

ubitx changes sideband by flipping oscillator 1 between 33mhz and 57mhz with a small correction
for the 45mhz filter that is not at 45mhz but about 5-10khz lower.    If the calibration is off or not
done correctly these oscillators will be off for the 45mhz filter and sensitivity will suffer (if far enough off).

Now if the 25mhz crystal on the Raduino board is off and generally they will be its the master
oscillator for the whole game.  So the first thing is to get the "calibration" dialed in so when the
MPU/software commands xxx frequency you actually get it and the other two oscillators are also
where they should be.

Changing out the crystals in the filter can improve the filter but not likely solve the "tinny sound"
as that set will likely have a different offset for the BFO.   FYI changing the parallel capacitors 
will also move the filter center frequency and the bandwidth requiring BFO change.  
They are not SMT they are conventional leaded HC49U parts and easily desoldered without
art or rework station.

If the BFO is right the low end should cut off at about 200hz and the high end around 2300hz.
That will not be tinny.

For an FYI: I included a image of the filter pass band while testing a personal mod to get 
to a wider band width (2.7khz) for better fidelity.  The ripples on the top of the pass band
are about 1.5db and not at all bad.  Even widened up the upper edge is barely 12mhz
(11.999985ish mhz).  Best sideband setting is 11.996685mhz for that filter.

Allison

Re: Tinny sounding electric miss on uBitx

Timothy Fidler
 

Arggh an assumption re-arranged  makes an Ass out of you and me.!!!. I thought Ashar F would have gone done the merry conventional way with pulling the BFO to get sb flip  ..


so next time you want Space shuttle Field joints and O rings re-designed  AP .. you know where NOT to go.

Every single photo  I have seen of uBitx or ubitx40 seems to have half height xtals on it so either AJP got a premium build or TEF needs better specs or a bit of both.    :-).  

Re: hacking bitx40 for 20 metre #bitx40

Timothy Fidler
 

 
Ryan,  Hints sent to your youtube page based on KNOWN performance of similar Renesas   mosfet in parallel operation for bringing power up to region 14W RF out.

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



----- Original Message -----
From:
BITX20@groups.io

To:
<BITX20@groups.io>
Cc:

Sent:
Thu, 02 Aug 2018 18:08:38 -0700
Subject:
Re: [BITX20] hacking bitx40 for 20 metre #bitx40


Terry, I did this. I also changed the PA FET for a RD15HVF1 because it worked a lot better on 20m than the IRF510. Info on both here:

http://miscdotgeekcom/converting-bitx40-20m/

https://www.youtube.com/watch?v=-1u-cANWMTM

--
Ryan Flowers - W7RLF
MiscDotGeek.com
Multi Band BITX40
The BITX40 FAQ

Front Panel Stereo Socket Board Wiring Layout

Sunil Lakhani
 

The front panel stereo socket board wiring layout for universal case for ubitx has been published. 8 pin relimate female to female connectors are used for digital and analogue connectors on ubitx board and the front panel board.
For mic ptt, volume, encoder, speaker TVS connectors have been used with right angle pins.The case comes now complete with these accessories too.Those that want the wire kit or complete kit with board can get from our website amateurradiokits.in

Pictures for front panel board.

https://groups.io/g/BITX20/photo/6439/7?p=Name,,,20,1,0,0

https://groups.io/g/BITX20/photo/6439/8?p=Name,,,20,1,0,0

use any wire but follow the wire sequence. 
Kindly report if any mistake found.

best of 73s
Sunil  VU3SUA