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Re: Spurious RF at beginning of CW transmission in the uBitx

 

Bob,

Try the ubuitx.net trick I poseted a day back.? The two cross coupled 3904s to pull the unused
power line to ground.

Allison
Re: End Fed antennas w/ uBITX #ubitx

 

The cables add common mode inductance.? That is an incorrect assumption as a result.

We had this conversation before. In this stream.

?Allison
Re: Spurious RF at beginning of CW transmission in the uBitx

 

UPDATE!!!!!

I tried my earlier suggestion about putting a diode in series with R66 and it causes another problem. The energy stored in C64 keeps the mic amplifier running for about a half a second after releasing PTT, feeding mic audio into the audio output stages resulting in feedback and a nice squeal in the audio output! Maybe all (or half) of N3GO's solution would be better, at least for clamping the TX line.?

73,
Bob N1KW
Re: End Fed antennas w/ uBITX #ubitx

Warren Allgyer
 

Allison

The transformers have a common ground shared by the primary and secondary. The coax pigtails connected to the low impedance side of each transformer were, along with the low side of both high impedance windings, were all soldered together. The 1 meter pigtails were connected by N connectors to the tracking generator output and to the input of the spectrum analyzer respectively. So, yes, the grounds were connected in the back to back test.

With regard to seeking the permission of the participants in the email trail; no, I did not.

WA8TOD
Re: code compile #bitx40 #firmware

 

¿ªÔÆÌåÓý

Also, make sure you are using the latest version of the Arduino compiler.

On 7/31/2018 2:12 PM, terryhugheskirkcudbright via Groups.Io wrote:

hi

i loaded ubitx-v4.3-code into aduino iide and clicked on compile/verify

the error message " checkCAT() not declared in this scope

what has gone wrong

note - i have no trouble in compiling the bitx40 code

terry gm4dso


Re: RF out

 

Mike, good cheat!

Me I pulled the connector and the pins and drilled three more holes and use
a PC mount SMA so it points straight up.?

Made testing easier and it looks cool.

Allison
Re: Need Help

[email protected]
 

Hi Allison,

Thanks for your help!

That what I thought so I order a replacement encoder from Digi-Key and installed it this morning still the same.

I just received my uBITX last week, it seemed to be working with a bit of hum but yesterday when I turned it on my encoder seems to have stopped working. When I turn the uBITX on the top line of the display reads uBITX v4.3 and the bottom line reads LSB A 7.149.950, when I turn the encoder shaft it changes only from 7.149.900 to 7.149.950! When I push the shaft in I get on the top line Band Select and an arrow that¡¯s all that happens.

Best regards,
Re: code compile #bitx40 #firmware

 

Is? ubitx_cat.ino in the same directory as the V4.3 code?

There should be 7 files:
ubitx_si5351.ino
ubitx_menu.ino
ubitx_keyer.ino
ubutx_factory_alignment.ino?
ubitx_ui.ino
ubitx_cat.ino
ubitx_v4.3_code.ino

Why does this happen?? Usually its because if the Arduino-IDE is loading a file for the
first time the file and the directory have to match and if it doesn't it will create it and copy that
one file to the directory.? However as your can see the sketch is spread across 7 files all of
which should be in the same directory.

The error message was the compiler saying "hey? you told me I need this and cant find it!"..

Allison
Re: Need Help

 

Wheck wires/wiring and then check the encoder for possible failure.

The fact that you get some indications of activity suggests it is broken.

Allison
Re: End Fed antennas w/ uBITX #ubitx

 

Warren,

Did you ground coax at the transformer to the the other in the back to back test?
For clarity a piece of heavy wire from the coax connector of one to the coax connector
of the other transformer.

IF no, redo your work and report if there is a difference.

Allison
Re: End Fed antennas w/ uBITX #ubitx

 

?Did the other participants grant permission to post that?? As that would be my
first question.? I see no such permission granted.? As such if they ask the mods?
to take it down I'd not?be surprized.

Allison
code compile #bitx40 #firmware

 

hi

i loaded ubitx-v4.3-code into aduino iide and clicked on compile/verify

the error message " checkCAT() not declared in this scope

what has gone wrong

note - i have no trouble in compiling the bitx40 code

terry gm4dso
Re: ND6T AGC and Click kit wiring notes

 

Yes, the AGC mini-kit works with the Ver-4 uBITX board.

Ordering info and a lot more is in the "Files" section of this reflector under my call.

73 Kees K5BCQ

?
Re: Spurious RF at beginning of CW transmission in the uBitx

 

Bob
Agreed.? That sounds good.
Arv


On Tue, Jul 31, 2018 at 10:40 AM <n1kw@...> wrote:
Hi Arv,

It is probably a good idea to have some series resistance in the circuit (over and above that of the diodes) to limit the peak current to the 47 uF capacitors during RX-TX-RX transitions and maybe save some wear on relay K1's contacts.?

Cheers,
Bob N1KW

Re: Spurious RF at beginning of CW transmission in the uBitx

 

Hi Arv,

It is probably a good idea to have some series resistance in the circuit (over and above that of the diodes) to limit the peak current to the 47 uF capacitors during RX-TX-RX transitions and maybe save some wear on relay K1's contacts.?

Cheers,
Bob N1KW
Re: Spurious RF at beginning of CW transmission in the uBitx

 

Bob? N1KW

I'm a bit short on time right now, but when finished with a current project I will
revisit a few older pre-uBITX transceivers (BITX17A, and a BITX40A) to see
if the diode idea will work on them.? These rigs have never been modified from
original and do have the transition click and 20 ms burst of RF.?

It is common philosophy to use a small dropping resistor and electrolytic capacitor
to filter and isolate voltages to some stages of equipment.? A couple of years ago John
VK6JY and myself performed some simulations using LT spice, followed by real tests
to look at using a diode in place of that small resistance.? The result seemed to indicate
that a diode could replace the resistor, resulting in even better isolation and filtering.
Your adding a diode to the RC network seems similar.? This makes me wonder if
it might work to just replace the 22 ohm R-71 with a diode??

Arv? K7HKL
_._


On Tue, Jul 31, 2018 at 3:25 AM <n1kw@...> wrote:
Hi Arv,

I have not played with the radio much on SSB but suspect that is probably the cause for the "BITX Click". Simply adding a diode in series with R66 (cathode toward C64) should fix the problem.

It is important to note that the possibility of brief oscillation could occur in both the 12 and 45 MHz bidirectional IF amplifier stages because of the back feeding of power from C52 and C64 during RX-TX and TX-RX transitions. Diodes added in series with R52 and R66 should eliminate that possibility. The values of remaining bypass capacitors (0.1 uF) in the IF amplifiers and associated discharge paths should result in extremely short time constants and should not be an issue.

Cheers and 73,
Bob N1KW
Re: ND6T AGC and Click kit wiring notes

 

I have order 3 new version 4 board kits. Will your AGC work on the ver 4?? How do I order if so.? I would like to see SWR/PWR meter, if possible to see on 7 inch LCD.

Alan Kessler WB2BQK
truffies@...
Re: ND6T AGC and Click kit wiring notes

 

My name is Alan WB2BQK,? just ordered 3? V4 ubitx kits.? ?Will your AGC kits work on the V4 boards? Plus like to have SWR/Power meter, if possible to work on the 7inch LCD screen.

THank you

please cost of AGC kits and how do I contact you.

Alan Kessler

-----Original Message-----
From: Kees T
Sent: Jul 31, 2018 11:20 AM
To: [email protected]
Subject: Re: [BITX20] ND6T AGC and Click kit wiring notes

A total of 864 AGC and/or Click mini-kits have been shipped so far. This is way more than i expected but that's OK .....popular circuits Don, ND6T, came up with.? Presently, I have about 20 AGC boards left from the last EasyEDA board order and about 100 Click boards left. It's been fun but it's time for me to do something else (like the SWR/Power meter as described earlier).

The new Ver 4 uBITX boards have the Click problem fixed. Therefore, after the last available AGC mini-kits have been sold/shipped, 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 ??

The AGC board and Click board Gerbers have been uploaded to the files section under my call.

"On order" and "shipped" information is available in the "Files" section under my call.

73 Kees K5BCQ

Need Help

[email protected]
 

My encoder seems to have stoped working. When I turn the uBIT on the top line of the display reads uBITX v4.3 and the bottom line reads LSB A 7.149.950, when I turn the encoder shaft it changes only from 7.149.900 to 7.149.950! When I push the shaft in I get on the top line Band Select ? and a arrow thats all that happens. How do I fix this problem?

Best regards to all
Re: ND6T AGC and Click kit wiring notes

 

I'd love to see a SWR/Power meter for the Bitx/uBitx. Go for it.

73

Ken VA3ABN

On Tue, Jul 31, 2018, 11:20 AM Kees T <windy10605@...> wrote:
A total of 864 AGC and/or Click mini-kits have been shipped so far. This is way more than i expected but that's OK .....popular circuits Don, ND6T, came up with.? Presently, I have about 20 AGC boards left from the last EasyEDA board order and about 100 Click boards left. It's been fun but it's time for me to do something else (like the SWR/Power meter as described earlier).

The new Ver 4 uBITX boards have the Click problem fixed. Therefore, after the last available AGC mini-kits have been sold/shipped, 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 ??

The AGC board and Click board Gerbers have been uploaded to the files section under my call.

"On order" and "shipped" information is available in the "Files" section under my call.

73 Kees K5BCQ

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