Re: LED for XMIT indication

#19723

Hi

There is 12 VDC across the coil when the PTT switch is pressed, closing the relay coil to GND.

A 12 V LED, which would have an internal current limiting resistor, can be connected directly across the relay.

A LED without an internal resistor will need a current limiting resistor. If the LED has a forward voltage drop of 1.7 volts. That would leave 12-1.7=10.3 volts across the resistor. Let's call it 10 volts to make it easy. And if we want about 15 mA for the current through both the LED and resistor, the resistor value is. R=V/I ?10/0.015=666 ohms. 680 ohm is a common value. Anything within 200 ohms will probably work.?

Experiment with a LED and resistor across the 12 V power supply to see what works for you.

Have fun

Randy, K7AGE

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On Tue, Jan 3, 2017 at 4:39 PM, Ronny Julian k4rjjradio@... [BITX20] <BITX20@...> wrote:

?

Randy what value would you say is god for a standard 5mm red LED?
Ronny
K4RJJ

On Tue, Jan 3, 2017 at 7:23 PM, Randy Hall listk7age@... [BITX20] <BITX20@...> wrote:

?

Hi,

Looking at the schematic looks like an easy place to add a LED would be across the relay coil. Along with a current limiting resistor in series with the LED.

Randy, K7AGE

On Tue, Jan 3, 2017 at 3:23 PM, k1kob@... [BITX20] <BITX20@...> wrote:

?

Where on the new BITX V3 SMD board do I insert a RED LED lead
to come on when I push the PTT switch ?? I'm waiting for the $14.00
VFO upgrade to come, then I'll be on the air

Re: LED for XMIT indication

Ronny Julian

#19722

Randy what value would you say is god for a standard 5mm red LED?

Ronny

K4RJJ

Show quoted text

On Tue, Jan 3, 2017 at 7:23 PM, Randy Hall listk7age@... [BITX20] <BITX20@...> wrote:

?

Hi,

Looking at the schematic looks like an easy place to add a LED would be across the relay coil. Along with a current limiting resistor in series with the LED.

Randy, K7AGE

On Tue, Jan 3, 2017 at 3:23 PM, k1kob@... [BITX20] <BITX20@...> wrote:

?

Where on the new BITX V3 SMD board do I insert a RED LED lead
to come on when I push the PTT switch ?? I'm waiting for the $14.00
VFO upgrade to come, then I'll be on the air

Re: LED for XMIT indication

#19721

How many volts are going through there? Radio Shack sells 12V red colored LED's with a resistor built into them (I use one on the heated build platform of my homebrewed 3D printer, so I know when the bed has current running through it).

Rich

KC8MWG

On Tuesday, January 3, 2017 7:23 PM, "Randy Hall listk7age@... [BITX20]" wrote:

Show quoted text

?

Hi,

Looking at the schematic looks like an easy place to add a LED would be across the relay coil. Along with a current limiting resistor in series with the LED.

Randy, K7AGE

On Tue, Jan 3, 2017 at 3:23 PM, k1kob@... [BITX20] <BITX20@...> wrote:

?

Where on the new BITX V3 SMD board do I insert a RED LED lead
to come on when I push the PTT switch ?? I'm waiting for the $14.00
VFO upgrade to come, then I'll be on the air

Re: LED for XMIT indication

#19720

Hi,

Looking at the schematic looks like an easy place to add a LED would be across the relay coil. Along with a current limiting resistor in series with the LED.

Randy, K7AGE

Show quoted text

On Tue, Jan 3, 2017 at 3:23 PM, k1kob@... [BITX20] <BITX20@...> wrote:

?

Where on the new BITX V3 SMD board do I insert a RED LED lead
to come on when I push the PTT switch ?? I'm waiting for the $14.00
VFO upgrade to come, then I'll be on the air

Re: It stopped transmitting

Bill Kittilson

#19719

开云体育

I get .9 volt in transmit on base and emitter. Collator is 12 volts I order replacements. ?Sounds like I have the same issue. ?

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On Jan 3, 2017, at 6:42 AM, parkerp@... [BITX20] <BITX20@...> wrote:

?

A friend had a similar problem. ?

The base & emitter voltages around Q13 were around 1 volt rather than 3.7v (base) and 3.1v (emitter). ?We fixed it by replacing Q13. ?If you're careful you can use a leaded transistor as the replacement.?

Described at?

A repair of a 'no power on transmit' fault suffered by a friend's Bitx40.

Preview by Yahoo

?

?

Re: 3d printable enclosures?

#19718

Ultimate Box Maker has a downloadable component that works in OpenSCAD so that you can put holes, openings, and even text where you want them. Problem is, I could never figure out how to get it to do what I wanted it to do. If all you want is a box of a certain size, with a blank front and back panel, then the online customizer is fine.

Rich

KC8MWG

On Tuesday, January 3, 2017 5:08 PM, "Jim Noeth ka9bgt@... [BITX20]" wrote:

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?

Actually, the 3D printed case referenced was created using Ultimate box maker.

Jim - KA9BGT

On 1/2/17 8:53 PM, mark.g0nmy@... [BITX20] wrote:

?

Well off the same site maybe this is what you are after?
scroll down to thebottom of the page to download.

The file include now the Panel Maker. Check below in the Experimental area to download it. My first try with OpenScad, the box is fully customizable. I hope y...

Preview by Yahoo

Hope that helps
Happy 2017

Bitx40 BPF

#19717

Am I correct to assume the BPF input and output is 50 ohms?

73

Ken VA3ABN

LED for XMIT indication

[email protected]

#19716

Where on the new BITX V3 SMD board do I insert a RED LED lead

to come on when I push the PTT switch ?? I'm waiting for the $14.00

VFO upgrade to come, then I'll be on the air

Re: Sad reality of stock vfo

#19715

ohwenzelph@... [BITX20] wrote:

thanks Alf,

so, did you end up with C95 47pF or 82pF?
jer aa1of
Yes, C95 is 82pF, only because I did not have anymore 47pF polystyrene, also with the values I had used for C91,92 being only 680pF each, the tuning range was somewhat reduced, however I have now changed C91,92 back to 1nF, now tuning
range is from 7.007MHz to 7.268MHz, frequency stability not effected, I have 100k pot for main tuning in series with a 1k pot for fine tuning which gives 6.1kHz range. Now I can tune a conversation, go make a cuppa, come back and still be tuned to the same frequency:-)  

 Alf vk2yac

Re: 3d printable enclosures?

#19713

Okay, someone sent me an email with questions about the Klopik-2 from Russia. I accidentally erased it while trying to reply on my phone, so please re-send it if you want me to e-mail you the documentation (whoever it was who was asking...). Yes, I do have the English documentation - I am surprised your boards did not come with that same documentation, in fact. It's not the greatest in the world, and some things got lost in the translation. It is definitely NOT a beginner's kit - in fact, I got frustrated and set it aside for a time, though I will get back to it later.

Second, I went with a DDS VFO based on the AD9850. I got it here:


			This board will control one of the small AD9850 DDS modules . It supports a 16x2 line LCD display showing the operating frequency, band and step size....
				Preview by Yahoo

?

? Rich

KC8MWg

.

Re: 3d printable enclosures?

#19712

Great! Looking forward to it. I'm waiting for my delivery, too (just shipped out yesterday).

Rich

KC8MWG

On Tuesday, January 3, 2017 12:58 PM, "ik8yfw@... [BITX20]" wrote:

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?

Hi Rich, thanks for looking at my enclosure, It was made by the customizer box that you can read in project page. I' m waiting the additional board raduino, then I 'm planning to complete the enclosure with a drilled panel using OpenScad or experimental panel maker. Also I Will add some support stuff to hold the raduino board. These are my projects. But need the raduino board to take right measure. I'm wait the delivery.

Have an Happy New year.
73 de Giuseppe, IK8YFW.

Re: 3d printable enclosures?

#19711

Hi Rich, thanks for looking at my enclosure, It was made by the customizer box that you can read in project page. I' m waiting the additional board raduino, then  I 'm planning to complete the enclosure with a drilled panel using OpenScad or experimental panel maker. Also I Will add some support stuff to hold the raduino board. These are my projects. But need the raduino board to take right measure. I'm wait the delivery. 

Have an Happy New year.
73 de Giuseppe, IK8YFW.

Re: BITX40 Band pass filter

#19710

the bpf quite useful for the entire 500 khz.?

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On 03-Jan-2017 6:24 pm, "sp9mrn@... [BITX20]" <BITX20@...> wrote:

?

Did anybody recalculated (or can recalculate) BPF filter to 7.0 to 7.2 MHz (stock is 7.0 to 7.3)

Mac
mrn

Re: Raduino

#19709

开云体育

I sent mine to teamhfsg@gmail . Com

By pay pail is this ok ?

Ray

KC4DYM

Sent from my iPad

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On Jan 3, 2017, at 2:31 AM, obeebe@... [BITX20] <BITX20@...> wrote:

?

Thank you . I will do that for sure :) VE7BEE

Re: schematic ambiguities

#19708

LM78L05 datasheet recommends 0.33uF within 3 inches of the input pin. ?The Bitx40 likely has that already. ?It is ?not being loaded very heavily. ? I doubt there's an issue, but would add a cap if the board were rolled.

Re: BITX40 Band pass filter

#19707

quote ==

Did anybody recalculated (or can recalculate) BPF filter to 7.0 to 7.2 MHz (stock is 7.0 to 7.3)
Mac , SP9MRN

unquote ===

It is highly unlikely that a BPF built for 7.0 -7.3 MHz? (ITU Zone 2) would give any problem with any TX supposed to operate only on the 7.0 -7.2? MHz ? (ITU Zone 1)

Frank ,? GM0CSZ / kN6WH????? in IO87AT

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On Tue, Jan 3, 2017 at 12:53 PM, sp9mrn@... [BITX20] <BITX20@...> wrote:

?

Did anybody recalculated (or can recalculate) BPF filter to 7.0 to 7.2 MHz (stock is 7.0 to 7.3)

Mac
mrn

Re: Sad reality of stock vfo

#19706

thanks Alf,

so, did you end up with C95 47pF or 82pF?

jer aa1of

Re: Audio injection

#19705

? ? Ashhar Farhan, thank you, was my question because I will adjust my linear but 200 mv pep is very I think, maybe 100 mv pep?

Jorge PY2PVT _._

2017-01-02 21:09 GMT-02:00 Bill Kittilson bill@... [BITX20] <BITX20@...>:

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?

If I was to injection a 1k sine wave into the mic connection for troubleshooting purposes. What's the safe peak to peak voltage?
I'm troubleshooting a dead transmitter.

Bill

--

? 73 de Jorge PY2PVT
? Campinas SP
? GG67MD

BITX40 Band pass filter

#19704

Did anybody recalculated (or can recalculate) BPF filter to 7.0 to 7.2 MHz (stock is 7.0 to 7.3)

Mac
mrn

Re: Sad reality of stock vfo

#19703

quote ====
I changed C91, C92 to 680pF polystyrene, C94, C95 to 47pF polypropylene,
C96 to 150pF polystyrene, C95 to 82pF polystyrene, just what I had in
the junk box, stability very good.

unquote ====

Yes ,polystyrene caps are excellent for VFOs

I built a single FET 80 m VFO? (ugly construction)for the " UK Intermediate Licence" training , running on a 9V battery , all on an open chassis.

Once in operation for 5 minutes drift was no more than 50 Hz longer term .

Frank? ,? GM0CSZ / KN6WH??????? in IO87AT

?

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On Mon, Jan 2, 2017 at 11:53 PM, Alfred fpdbase@... [BITX20] <BITX20@...> wrote:

?

ohwenzelph@... [BITX20] wrote:
>
> Who has "changed the on-board chip capacitors to leaded polystyrene
> types and report
> good stability." With the BitX40v3, and
>
>
> which caps did you replace and with what values?
>
> Jer aa1of
>
> ?
>
> .
>
>

I changed C91, C92 to 680pF polystyrene, C94, C95 to 47pF polypropylene,
C96 to 150pF polystyrene, C95 to 82pF polystyrene, just what I had in
the junk box, stability very good.

Cheers Alf vk2yac