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Re: How to connect a TX-RX LED to the BITX40 ?

Ian Reeve
 

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Very true in theory but I cannot recall seeing this done for bicolour leds,possibly because most circuitry with less are on a 5 v rail.I will use two resistors as you can vary their value to suit the differences in brightness between red and green.? Cheers. M0IDR

Get

From: [email protected] <[email protected]> on behalf of Raj vu2zap <rajendrakumargg@...>
Sent: Wednesday, October 17, 2018 1:55:56 PM
To: [email protected]
Subject: Re: [BITX20] How to connect a TX-RX LED to the BITX40 ?
?
Saving one resistor you will need two diodes in series with both RX and TX line to prevent the
voltage at the common point to go back through the LEDs from RX to TX power lines and vice-versa.
The Voltage across the dropping resistor will be 9-10V.

I looked a random LED spec sheet and it had reverse voltage of 5V..

Raj

At 17/10/2018, you wrote:
Very true and saves a resistor,however the little pcb supplied with the metal case is wired for two anode resistors.Just personal choice I guess to achieve the same thing.? 73. M0IDR

Get

From: [email protected] <[email protected]> on behalf of Ion Petroianu, VA3NOI <ion.petroianu@...>
Sent: Wednesday, October 17, 2018 12:15:36 PM
To: [email protected]
Subject: Re: [BITX20] How to connect a TX-RX LED to the BITX40 ?
?

Or, one can connect the anodes direct to RX/TX lines and use a single resistor from cathode to GND.
Ion
VA3NOI
Re: stl for dlwattmeter

James Lynes
 

Jack:
Good luck!

The dirth of technical articles makes the annual decision to renew QST very difficult.

James
Re: Something not right 24V PA BITX40

 

You mic output might be bad. I had this occur on my bitx40. Over the course of a couple weeks I was not getting more than a watt out.?

You didn't mention the power out when driven by the computer.?


On my ubitx, made a 317 powered regulator and run the rig from a 20v old laptop power supply Warms the clouds to the tune of 20 watts on one swr meter and 30 watts on my older power meter.?

The case on my bitx40 is too small to add in a similar power supply.?
Re: How to connect a TX-RX LED to the BITX40 ?

 

Saving one resistor you will need two diodes in series with both RX and TX line to prevent the
voltage at the common point to go back through the LEDs from RX to TX power lines and vice-versa.
The Voltage across the dropping resistor will be 9-10V.

I looked a random LED spec sheet and it had reverse voltage of 5V..

Raj

At 17/10/2018, you wrote:

Very true and saves a resistor,however the little pcb supplied with the metal case is wired for two anode resistors.Just personal choice I guess to achieve the same thing.? 73. M0IDR

Get

From: [email protected] <[email protected]> on behalf of Ion Petroianu, VA3NOI <ion.petroianu@...>
Sent: Wednesday, October 17, 2018 12:15:36 PM
To: [email protected]
Subject: Re: [BITX20] How to connect a TX-RX LED to the BITX40 ?
?

Or, one can connect the anodes direct to RX/TX lines and use a single resistor from cathode to GND.
Ion
VA3NOI
Re: How to connect a TX-RX LED to the BITX40 ?

Ian Reeve
 

¿ªÔÆÌåÓý

Very true and saves a resistor,however the little pcb supplied with the metal case is wired for two anode resistors.Just personal choice I guess to achieve the same thing.? 73. M0IDR

Get

From: [email protected] <[email protected]> on behalf of Ion Petroianu, VA3NOI <ion.petroianu@...>
Sent: Wednesday, October 17, 2018 12:15:36 PM
To: [email protected]
Subject: Re: [BITX20] How to connect a TX-RX LED to the BITX40 ?
?

Or, one can connect the anodes direct to RX/TX lines and use a single resistor from cathode to GND.
Ion
VA3NOI


--
Ion

VA3NOI

Re: How to connect a TX-RX LED to the BITX40 ?

 

Or, one can connect the anodes direct to RX/TX lines and use a single resistor from cathode to GND.
Ion
VA3NOI


--
Ion

VA3NOI
Re: Radrino for the bitx40 - Spare needed

 

Thank You

I will look up the correct address and send an email
Re: upgrade help

 

Hello Scott,

happy your uBitx finally started with KD8CEC software ! He actually made a GREAT job to bring new features and ease of use.

Good luck for your next display build :)

73

--
Laurent F5FIE.
Re: How to connect a TX-RX LED to the BITX40 ?

Ian Reeve
 

¿ªÔÆÌåÓý

This works perfectly as a rx/tx indicator using a bi-colour (red/green) led.

In the uBITX case,the led is for me too bright so I have increased the value of the ?series resistors to suit. Mine are 1.8K,personal choice,mileage may vary.

?

73

?

Ian

M0IDR

?

Sent from for Windows 10

?

From: [email protected] <[email protected]> on behalf of Woody <mailme@...>
Sent: Wednesday, October 17, 2018 2:15:57 AM
To: [email protected]
Subject: Re: [BITX20] How to connect a TX-RX LED to the BITX40 ?
?
This is what I would do...??? At least for the uBITX, Don't have the schematic for the '40.
Maybe similar?
The T/R relay is at the lower left of the uBITX schematic.
680 ohms will yield ~17 ma for the LED,? 1000 ohms for ~12 ma.?? ...etc.
LED addition in red.



On 10/17/2018 0:06, Andy Sagoya via Groups.Io wrote:
Hello,

can anyone help how i must connect a RX/TX LED to the BITX40 ?
I am new to this "branch" so a little bit of help would be fine

73
Armin

Re: Radrino for the bitx40 - Spare needed

 

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Typo : doesnt look right

Sent by my iPhone

On 17-Oct-2018, at 13:09, Raj vu2zap <rajendrakumargg@...> wrote:

Farhan, email does not right ?

Sent by my iPhone

On 17-Oct-2018, at 12:59, Ashhar Farhan <farhanbox@...> wrote:

hfsignals sells them at $25 dollars. write to them at hfsigansl@...

- f

On Wed, Oct 17, 2018 at 11:54 AM Gary.ingle via Groups.Io <Gary.ingle=[email protected]> wrote:
Hi Bill

I reconnected it incorrectly, in reverse as I was holding it upsidedown.
This must have put power on the wrong pins.

Now it wont work.

Re: Radrino for the bitx40 - Spare needed

 

¿ªÔÆÌåÓý

Farhan, email does not right ?

Sent by my iPhone

On 17-Oct-2018, at 12:59, Ashhar Farhan <farhanbox@...> wrote:

hfsignals sells them at $25 dollars. write to them at hfsigansl@...

- f

On Wed, Oct 17, 2018 at 11:54 AM Gary.ingle via Groups.Io <Gary.ingle=[email protected]> wrote:
Hi Bill

I reconnected it incorrectly, in reverse as I was holding it upsidedown.
This must have put power on the wrong pins.

Now it wont work.

Re: Radrino for the bitx40 - Spare needed

 

hfsignals sells them at $25 dollars. write to them at hfsigansl@...

- f

On Wed, Oct 17, 2018 at 11:54 AM Gary.ingle via Groups.Io <Gary.ingle=[email protected]> wrote:
Hi Bill

I reconnected it incorrectly, in reverse as I was holding it upsidedown.
This must have put power on the wrong pins.

Now it wont work.

Re: Radrino for the bitx40 - Spare needed

 

Hi Bill

I reconnected it incorrectly, in reverse as I was holding it upsidedown.
This must have put power on the wrong pins.

Now it wont work.
Re: stl for dlwattmeter

[email protected]
 

¿ªÔÆÌåÓý

I would like to ask the size of the can (I assume it is a quart), the brand of mineral oil you used, and sources for both. I did not see that information in the article/webpage. I haven't had any dealings with mineral oil and would appreciate knowing of some good for 100 Watts of RF.

I agree, build-it projects are good! The more, the better!

73, Donald, KB5PWL

On 10/16/2018 10:32 PM, Jack Purdum via Groups.Io wrote:

Thanks, Guy, you note is appreciated. We plan to keep badgering editors to have more construction projects, as we think there are a fairly significant number of us out here who really do enjoy building "stuff"!
Again, thanks!
Jack, W8TEE

?

Re: stl for dlwattmeter

Jack Purdum
 

Thanks, Guy, you note is appreciated. We plan to keep badgering editors to have more construction projects, as we think there are a fairly significant number of us out here who really do enjoy building "stuff"!

Again, thanks!

Jack, W8TEE

On Tuesday, October 16, 2018, 7:13:25 PM EDT, Guy WB7SZI <sgbridge@...> wrote:


Just wanted to say congratulations to you & Al on the great article and project in the Nov. QST!

73,
Guy WB7SZI?

Re: Simple spur fix

 

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Hello Raj,

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I have ver 4 of the uBITX board. Adjusting the BFO frequency a bit brought the carrier down to below -40dBS so I am good to go there. However, I still have this semi-distorted whisper of my voice coming out of the speaker when I transmit. It happens on all bands but is most notable at 80 and 40 meters. A picture of the filter board as connected is attached. This issue doesn¡¯t appear to negatively effect the audio of my transmitted signal. I am getting good audio reports.

?

Previous to this mod I had installed just the 45 mhz crystal filter ?to address the spurs issue and didn¡¯t notice any audio in the speaker when I was transmitting.

?

Tomorrow I am going to pull the filter board and install just the crystal filter again to see what happens

?

Ripley

?

Sent from for Windows 10

?

From: Raj vu2zap
Sent: Monday, October 15, 2018 11:59 PM
To: [email protected]
Subject: Re: [BITX20] Simple spur fix

?

A close up sharp photo will help to check.

?

V3 or V4 ?

?

Raj

?

At 16/10/2018, you wrote:

>Hello All,

>

>I just finished implementing the 45 Mhz crystal filter fix with the 7:2 impedance matching transformer on the output of the crystal. Now I am hearing myself in the speaker when I transmit and I am seeing the carrier wave on the SA when I push the PTT on the mic.

>

>I not sure why the crystal filter mod would be related to these two issues. Anyone experience anything similar?

>

>Ripley

?

?

?

?

Crystal filter board.JPG

Re: How to connect a TX-RX LED to the BITX40 ?

 

Well done, Woody!
Re: Harmonics and Relay Replacement

 

I suppose that the prescribed relay was 23105 5403 A201. i see that your relay has 5303 instead.
was it a typo?
regards
sarma vu3zmv



On Wed, 17 Oct 2018 03:22 Kees T, <windy10605@...> wrote:
It's very difficult (impossible) to do anything inside the relay. Those 47nF capacitors from both ends of the coil to the nearest ground definitely help reduce the coupling with ALL the relays tried so far. I believe Arv suggested doing that.

I'm at a loss for the proper way to test coupling through the relay from one side to the other and/or through the N/O contact.

The AXICOM spec says the RF isolation at 100MHz is -39dB.

73 Kees K5BCQ

Re: How to connect a TX-RX LED to the BITX40 ?

 

Separate LEDs? Each in series with a resistor from TX+ or RX+ to 0V (1k resistors a good start, but adjust for preferred brightness).
Single bi-colour LED? Given common-cathode, cathode to 0V, otherwise same.
73 de ZL2DEX
Re: How to connect a TX-RX LED to the BITX40 ?

Woody
 

¿ªÔÆÌåÓý

This is what I would do...??? At least for the uBITX, Don't have the schematic for the '40.
Maybe similar?
The T/R relay is at the lower left of the uBITX schematic.
680 ohms will yield ~17 ma for the LED,? 1000 ohms for ~12 ma.?? ...etc.
LED addition in red.



On 10/17/2018 0:06, Andy Sagoya via Groups.Io wrote:
Hello,

can anyone help how i must connect a RX/TX LED to the BITX40 ?
I am new to this "branch" so a little bit of help would be fine

73
Armin
_._,_._,_



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