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
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Hallo,
do you use a Nextion Display?
73, Chris!
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Re: BITX40 and Data FT8/JT65 et al.
Zvika,
What value did you use for the DC block capacitors?
Thanks,
Stephen, KO4CVU
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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
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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
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
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Re: BITX40 and Data FT8/JT65 et al.
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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 _._
By updating the EEPROM have I made irreparable changes?
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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
_._
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Hi,
For importing to India maybe:? 8504.90.9610, or 8504.50.8000
73,? Mark
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Oh oh! I just saw thisOn the diagram of the Ubitx V6 the capacitor is not polarized. (To see on your models)Me on my diagram , it¡¯s polarizedMaybe it is that?Anyway, I¡¯m going to desolder it to control the output of the transistorcdt
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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
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Re: radio will transmit CW but not voice
By updating the EEPROM have I made irreparable changes?
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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
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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
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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.
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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
|
Re: radio will transmit CW but not voice
A weak signal at 10 MHz could indicate that alignment is needed.?
Misalignment can put the received signal outside the IF filter passband.
Zero-beat means matching the frequency of two signals.? There will be
a high pitched tone as one approaches zero-beat.? At zero-beat the
tone frequency will have decreased as match is acquired, and the tone
frequency will increase again as the adjustment is further advanced
on the opposite side of zero-beat.?
WWV operates in the high frequency (HF) portion of the radio spectrum. The station radiates 10 000 W on 5 MHz, 10 MHz, and 15 MHz; and
2500 W on 2.5 MHz and 20 MHz. Each frequency is broadcast from a
separate transmitter?
Geophysical alerts are broadcast from WWV
at 18 minutes after the hour
and from WWVH at 45 minutes after the
hour. The messages are less
than 45 s in length and are updated every 3
hours (typically at 0000, 0300,
0600, 0900, 1200, 1500, 1800, and 2100
UTC).
Go to the URL below and scroll down to the broadcast mode schedule circles. These show when WWV/NIST will be broadcasting a pure carrier (i.e.
no modulation to cause alignment to frequency plus or minus modulation). For using WWVB or WWVH as a frequency standard you want to wait
for the short periods when there is no modulation.
Arv _._
If I turn the dial until it reads roughly 60,000 I start getting all sorts of tones that change as I keep turning the dial up to about 100,000.? Then they all go away.
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Re: radio will transmit CW but not voice
You unintentionally went into calibration mode?
Turn the radio off, this will? exit calibration without updating EEPROM.
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Christian Schwabedal
Satish Chandorkar
Gerard
Sunil Lakhani