Date   
Re: Stuck at LSB A:7.149.950

Ian Reeve
 

That should read a piece of swarf lodged.


From: BITX20@groups.io <BITX20@groups.io> on behalf of Ian Reeve <ian.radioworkshop@...>
Sent: Wednesday, August 21, 2019 5:29:57 PM
To: BITX20@groups.io <BITX20@groups.io>
Subject: Re: [BITX20] Stuck at LSB A:7.149.950
 
I can only assume that there must be a piece of award lodged somewhere or the display and raduino. needs to be removed and  a very thorough examination made of all connections and pcb.Something is clearly drawing excess current and there is a remote possibility that the raduino has failed.Hope you manage to locate the problem


From: BITX20@groups.io <BITX20@groups.io> on behalf of Luke <iconcal504@...>
Sent: Wednesday, August 21, 2019 4:55:53 PM
To: BITX20@groups.io <BITX20@groups.io>
Subject: Re: [BITX20] Stuck at LSB A:7.149.950
 
Happened after drilled hole on casing with board installed, use compressed air to blow off any metal dust.
Close inspection did not see any. No smoke or smell after turned on.

Stuck at LSB A:7.149.950, cange change frequency.

Encoder changed, same problem, revert back to stock.

Re: Bitx40 very loud, high-pitched, low frequency noise

Gary Anderson
 

Ian, it's a Bitx40.  (good advice, just different radio)
wire-up
http://www.hfsignals.com/index.php/2017/11/23/wiring-up-the-bitx40/

Sounds like the LM386 could be oscillating around 4-5 kHz and making a faint barking dog-like noise.

SP9DEV what voltage are you supplying to the Bitx40?  Are you running or have run the LM386 at too high of a voltage?
The LM386 is set-up for a lot of gain in this configuration.  Amplifiers like to oscillate when the gain is pushed.

Rgds,
Gary

Re: Stuck at LSB A:7.149.950

Ian Reeve
 

I can only assume that there must be a piece of award lodged somewhere or the display and raduino. needs to be removed and  a very thorough examination made of all connections and pcb.Something is clearly drawing excess current and there is a remote possibility that the raduino has failed.Hope you manage to locate the problem


From: BITX20@groups.io <BITX20@groups.io> on behalf of Luke <iconcal504@...>
Sent: Wednesday, August 21, 2019 4:55:53 PM
To: BITX20@groups.io <BITX20@groups.io>
Subject: Re: [BITX20] Stuck at LSB A:7.149.950
 
Happened after drilled hole on casing with board installed, use compressed air to blow off any metal dust.
Close inspection did not see any. No smoke or smell after turned on.

Stuck at LSB A:7.149.950, cange change frequency.

Encoder changed, same problem, revert back to stock.

FS: uBITX V4 with case and Nexion display

Doug Person <doug@...>
 

I'm never going to finish this. I just have too many things on my plate right now.

Version 4 uBITX with gray case including 3.5" front panel for Nexion display *including* nexion 3.5" display.

I have partially assembled this. I *think* I have all the parts. But some screws or small parts might have gotten lost.

I just need let someone else have a go at it.

Everything shipped Priority Mail (CONUS) for $100.

Doug -- KJ0F

-- 
73 de Doug -- KJ0F

Re: Stuck at LSB A:7.149.950

Luke
 

Happened after drilled hole on casing with board installed, use compressed air to blow off any metal dust.
Close inspection did not see any. No smoke or smell after turned on.

Stuck at LSB A:7.149.950, cange change frequency.

Encoder changed, same problem, revert back to stock.

Re: Bitx40 very loud, high-pitched, low frequency noise

Ian Reeve
 

Perhaps a few pictures of your unit and connections might help a diagnosis as clearly the wiring colours do not match those on mine.


From: Ian Reeve
Sent: Wednesday, 21 August, 16:50
Subject: Re: [BITX20] Bitx40 very loud, high-pitched, low frequency noise
To: BITX20@groups.io


OK, I think we need to know a little more about the connections from the analogue connector.Firstly are you using a direct connection between this analogue connector and the sockets(earphone etc) or are you using the little pcb that houses the three Jack sockets. In mine I wire direct and the connections are. Green wire to volume low end orange to volume middle and yellow to volume high.There is no brown wire unless you use the pcb and that is a colour of the three wires from the Jack board. to volume.The speaker or headphones are connected to the brown and black wires on the right of the analogue connector.  Perhaps a few pictures of your unit

Re: Bitx40 very loud, high-pitched, low frequency noise

Ian Reeve
 

OK, I think we need to know a little more about the connections from the analogue connector.Firstly are you using a direct connection between this analogue connector and the sockets(earphone etc) or are you using the little pcb that houses the three Jack sockets. In mine I wire direct and the connections are. Green wire to volume low end orange to volume middle and yellow to volume high.There is no brown wire unless you use the pcb and that is a colour of the three wires from the Jack board. to volume.The speaker or headphones are connected to the brown and black wires on the right of the analogue connector.  Perhaps a few pictures of your unit


From: BITX20@groups.io <BITX20@groups.io> on behalf of SP9DEV <piotrekslawecki2@...>
Sent: Wednesday, August 21, 2019 2:33:20 PM
To: BITX20@groups.io <BITX20@groups.io>
Subject: Re: [BITX20] Bitx40 very loud, high-pitched, low frequency noise
 

@Raj vu2zap

The problem is at any volume

Re: Stuck at LSB A:7.149.950

Evan Hand
 

Is this a stock display?  Any other mods?

Easiest might be to just add a heatsink if one is not already installed.

This would be the first time that I have read about a stock system having 7805 regulator issues.  Might want to check wiring to see if something on the control lines is shorted and drawing down the regulator.  If only the frequency will not change, then focus on the encoder (other controls still work ie ptt and cw key).

73
Evan
AC9TU

Stuck at LSB A:7.149.950

Luke
 

Ubitx ver 4.3

Was working now frequency stuck at 7.149.950.
LM7805CT very hot power supply 12.5 v


Re: Where many of the ICs we still use today were born.

Jack, W8TEE
 

Some day I'll tell the follow-up to the story where I ran into that high school counselor 10 years later...

Jack, W8TEE

On Wednesday, August 21, 2019, 10:09:42 AM EDT, James Lynes <jmlynesjr@...> wrote:


My daughter is a PhD economist like you and she took all the math I did as an EE plus some! Maybe you should have stuck it out. Couldn't talk her into IE either...

James

Re: Where many of the ICs we still use today were born.

James Lynes
 

My daughter is a PhD economist like you and she took all the math I did as an EE plus some! Maybe you should have stuck it out. Couldn't talk her into IE either...

James

Re: Where many of the ICs we still use today were born.

Jack, W8TEE
 

Really neat stuff!! I loved electronics as far back as I can remember. I got my Novice license when I was 11 (1954), General a year later, and have been licensed ever since. I wanted to be an EE. After the 8th grade, you and your parents met with a high school counselor to decide whether you would pursue pre-college or vocational track. He told my parents I wasn't smart enough to be an EE and that I was destined to stay in my hometown and fix farm equipment. My parents wouldn't hear of it and sent me on the pre-college track, but I remember my hopes of being an EE were dashed...bummer...

Jack, W8TEE

On Wednesday, August 21, 2019, 12:10:30 AM EDT, Tom, wb6b <wb6b@...> wrote:


HI,

This interesting article shows prototypes like I see in projects in this group, are like the test and development prototypes for many analog ICs. A look into the days before SPICE simulations became the standard.

https://www.electronicdesign.com/analog/what-s-all-pease-prototype-stuff-anyhow?NL=ED-001&Issue=ED-001_20190820_ED-001_721&sfvc4enews=42&cl=article_1&utm_rid=CPG05000024615509&utm_campaign=27759&utm_medium=email&elq2=ef539cd304a741688af95f32ee05b17b&oly_enc_id=

Tom, wb6b

Re: Bitx40 very loud, high-pitched, low frequency noise

SP9DEV
 

@Raj vu2zap

The problem is at any volume

Re: Bitx40 very loud, high-pitched, low frequency noise

SP9DEV
 

@Ian Reeve the problem remains.

 

WSPR and APRS mobile

Ted
 

Has anyone set up WSPR for position report and message use?  I find Bob Bruninga's web pages read more like hypothetical possibilities than actual application but that's probably me. If I'm going to be one of only a dozen people doing this, the investment in time becomes a chicken vs egg enterprise while hoping it catches on.

The reason that I picked up a second uBitx in the first place is for mobile use in data formats.  I've been dabbling around with voice so far, with abysmal test results with voice mode due to QRP levels and, of course, mobile antennas which are abysmal by definition compared to what's required for good, low-power voice comms.  So, back to the digital formats....

What are people doing with WSPR - or other formats for that matter - that might translate well to a minimalist site (i.e. relief camp) capability or mobile application with these feature-rich yet lower-powered radios?


Tnx,

Ted
k3rta

Isolate any jacks/controls from metal chassis? #ubitx

Rob French (KC4UPR)
 

Are there any controls or jacks that I should isolate from my metal chassis?  Specifically, I'm thinking of the PTT and C/W key inputs, since those are wired to the Raduino.  Since they are part of the digital circuitry to some extent, should they be isolated from the chassis ground assuming I've got, e.g. the antenna RF out ground there?

Thanks,
-Rob

Re: Bitx40 very loud, high-pitched, low frequency noise

 

If the problem is at low volume level then add any resistor value between 1-10K in series with center volume control wire
and see if that helps.

Raj, vu2zap

At 21-08-19, you wrote:
Please help

Re: Bitx40 very loud, high-pitched, low frequency noise

Ian Reeve
 

OK short the lead that went to the centre contact to the case and advise if the noise stops.


From: BITX20@groups.io <BITX20@groups.io> on behalf of SP9DEV <piotrekslawecki2@...>
Sent: Wednesday, August 21, 2019 12:50:25 PM
To: BITX20@groups.io <BITX20@groups.io>
Subject: Re: [BITX20] Bitx40 very loud, high-pitched, low frequency noise
 
I tried unplugging the volume control completely, the problem persists

Re: Bitx40 very loud, high-pitched, low frequency noise

SP9DEV
 

I tried unplugging the volume control completely, the problem persists

Re: Bitx40 very loud, high-pitched, low frequency noise

Ian Reeve
 

I don't recall the colors of the wires that go to the volume control but what I would do is unsolder the lead to the centre connection(audio to amplifier) If the noise continues it signifies a problem within the audio circuit.Try touching the lead you unsoldered to bare metal to see if the noise stops. I do wonder if the volume control is faulty.  It sounds like instability and you need to see whether it is the audio amp  or whether the sound is coming from the rest of the circuitry before the audio amp.  Hope this helps. Ian M0IDR


From: BITX20@groups.io <BITX20@groups.io> on behalf of SP9DEV <piotrekslawecki2@...>
Sent: Wednesday, August 21, 2019 10:33:37 AM
To: BITX20@groups.io <BITX20@groups.io>
Subject: Re: [BITX20] Bitx40 very loud, high-pitched, low frequency noise
 
Please help