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Re: HS Code Required

 

I have the HS code for toroids.
Thanks to everyone for replying back .
The HS code is 85051110? for? Ferrite cores .
Best regards
Re: Parasites noises

 

Christian,

For my tests the screen Nextion is completly deconnected. i know it can make some noise but is't? completly different in my case.
I have gained experience on this type of assembly
The noise comme from Q70

I isolated Q70 which is a SMD model on my construction.
it oscillates alone at 40 MHZ!!! so therefore parasitizes the upper stages by modulation effect
I changed it, it¡¯s the same.

So I will do a test with a good old 2N3906 as on my first proto.

cdt
Re: BITX 4 Band with Linear Amplifier and AGC

 

Thank you for the kind reply and data. Greatly appreciated.?

There are several bom's for the bitx20. So i am trying to make sure i use the right one to order parts for the rest of the rig.
Thank you!!! mike
Re: Parasites noises

 

Hallo,

do you use a Nextion Display?

73, Chris!
Re: BITX40 and Data FT8/JT65 et al.

 

Zvika,
What value did you use for the DC block capacitors?
Thanks,
Stephen, KO4CVU
Re: BITX 4 Band with Linear Amplifier and AGC

 

Attaching the required files


On Sat, May 1, 2021 at 10:20 AM Ashhar Farhan <farhanbox@...> wrote:
Can you post us the schematic? The thing to do would be to draw them out in ltspice and measure it for yourself. I am sure someone here can set it up for you

On Sat 1 May, 2021, 9:52 AM Kj7OCO, <mcobb@...> wrote:
Newbie here.....i bought some bitx 4 band boards from pcbway......Mr.?Wahyu Hidayanto says the board is essentially a bitx20 with of course some on-board band pass filters.?

I was looking for the BOM for this board..........or assume as Mr. Hidayanto says...........use the bitx20 BOM and the:
80M
L1 = L2 = 2.2uH
L3 = 4.7uH
C1 = C2 = 1.5nF
C3 = 680pF
?
40M
L1 = L2 = 1uH
L3 = 2.2uH
C1 = C2 = 820pF
C3 = 390pF
?
20M / 30M
L1 = L2 = 0.47uH
L3 = 1uH
C1 = C2 = 390pF
C3 = 180pF
?
15M / 17M / 10M
L1 = L2 = 0.33uH
L3 = 0.68uH
C1 = C2 = 180pF
C3 = 82pF

I assume i am on the right path?

How anyone built one of these?

Thank you for putting up with? fast learning newbie.

mike

0857537217656.jpg
0857212775147.jpg
2318455121066.jpg

Re: BITX 4 Band with Linear Amplifier and AGC

 

Can you post us the schematic? The thing to do would be to draw them out in ltspice and measure it for yourself. I am sure someone here can set it up for you


On Sat 1 May, 2021, 9:52 AM Kj7OCO, <mcobb@...> wrote:
Newbie here.....i bought some bitx 4 band boards from pcbway......Mr.?Wahyu Hidayanto says the board is essentially a bitx20 with of course some on-board band pass filters.?

I was looking for the BOM for this board..........or assume as Mr. Hidayanto says...........use the bitx20 BOM and the:
80M
L1 = L2 = 2.2uH
L3 = 4.7uH
C1 = C2 = 1.5nF
C3 = 680pF
?
40M
L1 = L2 = 1uH
L3 = 2.2uH
C1 = C2 = 820pF
C3 = 390pF
?
20M / 30M
L1 = L2 = 0.47uH
L3 = 1uH
C1 = C2 = 390pF
C3 = 180pF
?
15M / 17M / 10M
L1 = L2 = 0.33uH
L3 = 0.68uH
C1 = C2 = 180pF
C3 = 82pF

I assume i am on the right path?

How anyone built one of these?

Thank you for putting up with? fast learning newbie.

mike
BITX 4 Band with Linear Amplifier and AGC

 

Newbie here.....i bought some bitx 4 band boards from pcbway......Mr.?Wahyu Hidayanto says the board is essentially a bitx20 with of course some on-board band pass filters.?

I was looking for the BOM for this board..........or assume as Mr. Hidayanto says...........use the bitx20 BOM and the:
80M
L1 = L2 = 2.2uH
L3 = 4.7uH
C1 = C2 = 1.5nF
C3 = 680pF
?
40M
L1 = L2 = 1uH
L3 = 2.2uH
C1 = C2 = 820pF
C3 = 390pF
?
20M / 30M
L1 = L2 = 0.47uH
L3 = 1uH
C1 = C2 = 390pF
C3 = 180pF
?
15M / 17M / 10M
L1 = L2 = 0.33uH
L3 = 0.68uH
C1 = C2 = 180pF
C3 = 82pF

I assume i am on the right path?

How anyone built one of these?

Thank you for putting up with? fast learning newbie.

mike
Re: radio will transmit CW but not voice

Mark - N7EKU
 

Hi,

I think you may find it easiest to use the firmware that has the "memory manager" software.? That way you can easily enter the default VFO and BFO calibration numbers, and then have a starting place to make later adjustments.

Unfortunately, I can't remember which firmware uses that software.? But I'm sure many here can help with that.

73,?? Mark
Re: BITX40 and Data FT8/JT65 et al.

 

Thanks Kobus!
Re: radio will transmit CW but not voice

 

No.? All the software you need is that provided by HF Signals.?

This may be different if you are using some other software than that provided
by HF Signals.? Some systems do provide separate EEProm data storage
that is not managed by the operating system but? is necessary for
normal operation.? For these there are several EEProm management
software packages that can edit what is stored in EEProm, or you can
simply write your own by following examples for Arduino coding.



Arv
_._


On Fri, Apr 30, 2021 at 5:57 AM <theaddies@...> wrote:
By updating the EEPROM have I made irreparable changes?

Re: radio will transmit CW but not voice

 

Most any audio amp that is capable of driving headphones or a speaker
can be used to trace audio through the uBITX circuitry.? Use a 0.1 mfd capacitor
as a probe to isolate the amplifier from DC.? Activate the PTT (Push-to-talk)
on your microphone and follow audio from the microphone, through the mike
amplifier in the uBITX, and on to the balanced modulator.? Audio at the mixer will
be clipped or distorted because of the mixer diodes.? This is normal.?

Add a diode to your external audio amplifier to monitor RF points.? This too
will sound distorted because you are using an AM detector to monitor DSB
and SSB, but it will tell you if you have modulation, or no modulation.?

If you do not have a suitable audio amplifier for audio signal tracing, one can
be easily built using an op-amp and a PP (Pull-Push) emitter follower using
one 2N3904 and one 2N3906.?

Arv
_._
Re: HS Code Required

Mark - N7EKU
 

Hi,

For importing to India maybe:? 8504.90.9610, or 8504.50.8000

73,? Mark
Re: Parasites noises

 

Oh oh!
I just saw this
On the diagram of the Ubitx V6 the capacitor is not polarized. (To see on your models)
Me on my diagram , it¡¯s polarized
Maybe it is that?

Anyway, I¡¯m going to desolder it to control the output of the transistor

cdt

Re: Parasites noises

 

hello,
Hello,
To clarify I have this problem on my 2nd prototype
The first one had 12MHZ filters and worked well the first time.
Careful, the implantations are different.
The 2nd is in filters 11059MHZ
Of course, I reloaded another PGM in the Arduino;?I took the version for Ubitx V5 of Kd8CEC.
I think the anomaly is at the output of the SSB filter and is more visible with the amplification of Q70.
It is very strange and has a modulation of 1.3?s with an internal oscillation of 0.08?s.
It is the M1 signal which with the relay passes to M2 for amplification.
So this causes a global interaction, which produces these strange crackles and noises.

For the moment I don¡¯t know where this modulation at 1.3 ?s comes from.
Some id¨¦a?

so?I would like to test the SSB filter by this method


I only have a generator and oscillo, how to test without desoldering?
Give me the connection points in relation to a V6 schema --> It's write to use the transformers for a best measurement.

cdt

IMG_20210430_152804.jpg

Re: radio will transmit CW but not voice

 

By updating the EEPROM have I made irreparable changes?
Re: Parasites noises

 

Hi Gerard,

You don't mention whether this is new behavior or whether it had existed since you completed your build.? I've had a similar problem after an upgrade, and it turned out to be a cold solder joist on the ground side of the rotary encoder.? I've seen similar issues to what you are reporting from the ground connections are not good.

Good luck,

Dean
KK4DAS
Re: HS Code Required

 

Sunil

This is an Indian code.? See for example?

You should be able to get Diz to label the correct code on your next shipment.

Keep up the good work on your kits!? I guess there may be new additions if Ashhar comes out with an SDR radio.? I am building one based around Charlie ZL2CTM¡¯s direct conversion end Teensy 3 design.

73 Mike ZL1AXG

On Fri, 30 Apr 2021 at 1:52 PM, Sunil Lakhani <vu3sua@...> wrote:
To import toroids? HS code required
1. T37-43
2. T37-6
3. T37-2
It would be great help if some one could share HS code for above toroids .
Last time we imported toroids from he did not mention any HS code.? The customs charged a very high duty as the invoice did not have HS code .
I asked Diz at kitsandparts he to was not sure for HS codes .
Thanks to group members for always being supportive.
Best of 73
Sunil vu3sua
Inkits Lucknow
Re: radio will transmit CW but not voice

 

I am sure I changed the setting on this screen.? I was attempting to revert back to the base configuration.? I realize that was a wrong assumption.
HS Code Required

 

To import toroids? HS code required
1. T37-43
2. T37-6
3. T37-2
It would be great help if some one could share HS code for above toroids .
Last time we imported toroids from kitsandparts.com he did not mention any HS code.? The customs charged a very high duty as the invoice did not have HS code .
I asked Diz at kitsandparts he to was not sure for HS codes .
Thanks to group members for always being supportive.
Best of 73
Sunil vu3sua
Inkits Lucknow
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