I¡¯m replacing a bad pl259 connector on my Gap Antenna with a BNC crimp connector and I¡¯m having a problem getting the various coax measurements like how far back to cut the outer jacket, the exposed braid, etc.?
So if anyone can direct me to a good assembly tutorial I would really appreciate it.?
Regards,
?Guy WB7SZI?
|
SDR and Ubitx freq not the same.
I have a uBITX V5 with the CEC v1.2 fw and installed a RTL SDR dongle as mentioned on de CEC blog.
Everything works only the RX frequenty on SDR is not the same as on the radio itself.
So RX on SDR console is for example 14.138MHz, when I switch back to the uBITX I have to tune to 14.1395 (which is the actual freq)
Is it possible to adjust that somewhere?
73 Werner pa3gyv
|
Like Jerry said, it¡¯s definitely a frees-up of the arduino. I have the same issue when connecting the arduino to my computer (for cat control) and doing things to fast.?
Easiest way for you is to swap the arduino with a fresh firmware.?
73 Werner pa3gyv?
|
Thanks all for help! The biggest problem was RF getting back into the radio. The dummy was to close to the radio.?
Have to sort out one more thing, the input for my souncard for digital radio is parallel to the mic. So when the radio is transmitting both pc line out and mic are open. Easiest way is to disconnect the mic but I¡¯m not born easy lol.
73
|
Gus,
If the display freezes up that means the Nano has gone off the rails for some reason.
First, make sure that the 5v supply on the Raduino coming out of the LM7805 is?
a good solid 5v when it fails.
Next, I'd try removing the Raduino from the radio, then power up the Raduino by
plugging it into a computer's USB port to feed it 5 volts.
See if it works better that way.
Even though it is not longer connected to the radio, the Raduino's display and encoder?
should work pretty much as they do when it is connected.
If it still doesn't work, then probe the encoder push button with a voltmeter.
You should see around 5v on the wire from the encoder switch into the Raduino
when the button is not pushed, and around 0v when the button is pushed.
Perhaps some other input into the Nano is getting sensed, and the firmware
in the Nano is waiting for it to be released?
Make sure the morse code key is wired up as described in the instructions,
and carefully check all the other wires into the Raduino.
But my best guess is that you have a defective or blown Nano that needs to be replaced.
If you have a Raduino that's only a year or so old, it will have a socketed Nano.
The Nano's are available on the web for about $3.
Not a bad idea to buy more than one, as they are easy to blow.
And easy to find other uses for once you learn a little bit of programming in the the Arduino environment.
If you do this,? be sure to buy one that has the header pins not yet soldered in place:
? ??
To have it fit into the Raduino socket, the pins will have to be installed on the "wrong" side of the nano.
You will also have to program the nano over a USB cable using the Arduino environment
on a host computer with firmware appropriate for the uBitx.
Perhaps others in the forum will have other suggestions for things to try
before you go to the trouble of replacing the Nano.
??
Jerry, KE7ER
toggle quoted message
Show quoted text
On Fri, Sep 13, 2019 at 12:22 PM, <gustav316@...> wrote:
My uBitx seems to be working after some prior difficulties (that some of you may recall). When I power on the radio, the VFO (as well as the push function on the VFO knob) seems to function properly for about 10-20 seconds, after which it just freezes and won't operate. Any ideas? Thanks in advance for any thoughts on this.
|
My uBitx seems to be working after some prior difficulties (that some of you may recall). When I power on the radio, the VFO (as well as the push function on the VFO knob) seems to function properly for about 10-20 seconds, after which it just freezes and won't operate. Any ideas? Thanks in advance for any thoughts on this.
-Gus
|
Re: 0dBm and -60dBm calibration
Wow, that's impressive!
It reminds me of when I first got my a couple of years ago, and thought I should calibrate my HP 8924c Service monitor. Turned out that 20+ year old instrument that hadn't been calibrated in years was off in frequency by just fractions of a Hz :-)
Cheers, Jonas - SM4VEY
I was so surprised that the thing works so well... the reading?on my spectrum analyzer was 0dBm?+/- 0.05dBm and the 'scope 0dB?+/- 0.1dBm... it is improbable that the calibrator, spectrum analyzer and 'scope could all agree so precisely by chance alone... so it led to me regaining the impaired trust in these instruments, and thankfully having a method to check calibration in future too.?
73 Hans G0UPL
_._,_._,_
|
Re: 0dBm and -60dBm calibration
Hi Raj
> What I am saying here Hans is that 0dbm is no use to check an Antuino? > unless we have a 20db attenuator. > Calibrator will be useful for the Antuino between -20 and -80
Yes, I understand that... but please watch my video? or look at the web page that inspired it () ... the calibrator already HAS a 60dB attenuator in it.?
What I am saying is that it provides BOTH a 0dBm output AND a -60dBm output. Therefore the -60dBm output is eminently?suitable for checking the calibration?of an Antuino.?
I was so surprised that the thing works so well... the reading?on my spectrum analyzer was 0dBm?+/- 0.05dBm and the 'scope 0dB?+/- 0.1dBm... it is improbable that the calibrator, spectrum analyzer and 'scope could all agree so precisely by chance alone... so it led to me regaining the impaired trust in these instruments, and thankfully having a method to check calibration in future too.?
73 Hans G0UPL
|
Re: Amplifier Talk- Communications Concepts
Well Ashar
I plugged KL203 and not bad.? Not the best but works.? I need to mod KL203 to expand the power range; on 20m, it was good no issues.
Sajid
|
Re: Amplifier Talk- Communications Concepts
The WA2EBY amp has been the staple around the bitx community. I am bored with the IRF510s now. I just bought a triplet of 811a tubes. I am mortified at the thought of 1000v dc in the shack...
The AN762-140 should be a good amplifier, I think it was described so in the ARRL 2010 Handbook. It needs lowpass filters like those Communication Concepts sells. It seems not overly complex to build.
|
Re: Amplifier Talk- Communications Concepts
The AN762-140 should be a good amplifier, I think it was described so in the ARRL 2010 Handbook. It needs lowpass filters like those Communication Concepts sells. It seems not overly complex to build.
Il 13/set/2019 07:03, "Mark - N7EKU" < n7eku@...> ha scritto: Hi Jeff,
Well that one really is just a CB amp -- the biasing not linear and uses only a diode (a design for CW and FM use) and the output transformer design dated (leading to low efficiency).? The AN762-140 also low power in/140W out but is a much better design (with OK IMD specs) and $4 cheaper!?
73,
Mark.
|
Re: Never used V3 uBitx Board Available
Correction. Main board and Radiuno
|
Re: Never used V3 uBitx Board Available
|
Re: Amplifier Talk- Communications Concepts
I know Helge and what you say is not true.? His RF designs are outstanding still today.? His work pioneered matching transformer designs for transistor devices, taking into account many parameters (saturation, capacitance, stray inductances, etc. over frequency).? His designs incorporated temperature compensated bias for thermal creep, and some later used RF chokes to offload current flux and pre-saturation from it in the RF transformers¡ something that few designs do even today. ? Now, if you mean that his amplifier boards didn¡¯t incorporate filtering to meet FCC regs (etc, name your country)¡ yes that is true.? This is because as you say his designs were demonstration designs, and it was left to the designer to add such filters¡ But that is true of almost everything you buy off eBay today except for complete amplifiers. ? MRM ?
toggle quoted message
Show quoted text
From: [email protected] [mailto:[email protected]] On Behalf Of Razvan Fatu
Sent: Friday, September 13, 2019 3:52 AM
To: [email protected]
Subject: Re: [BITX20] Amplifier Talk- Communications Concepts ? The Motorola Helge Granberg designs are almost 30 years old now. Keep in mind they are only engineered to the level that demonstrates the functionality of a part and since then there have been important developments in materials and components. Once you understand that, designt he rest of the required circuitry and the right output filters, you might end up with a decent amp.
Alternatively, for about the same cost, less work and much more predictable results, you can find on eBay PA Units and Filter Units from old transceivers.
Cheers,
Razvan M0HZH -- ¡_. _._
|
Re: Ubitx help In Cincinnati
Tony
Most important is to not mess up dc power connection.? do you have a dvm? You can and should verify each connection with the ohmmeter setting. Most important don't make a short circuit between positive and negative leads of your power source. Check everything before powering up. I see there is a new larger wiring diagram here. You can figure this out, don't be overconfident without checking things out.
After getting power right, much help available here. But do find folk nearby, check websites of local clubs.
Curt
|
Re: SSB exciter with digital audio phasing
Hi
In my NEW SITE:
How to program the DSpic for digital audio phase shift 300Hz to 3kHz (in portuguese)
73 de py2ohh miguel
|
Re: New wiring diagram version
OK thanks.
I've wired my ubitx yesterday evening and I've connected the +12V through a diode after the fuse.
The S1 switch (on the volume knob is cutting the +12V. For now the PA PWR is directly supplied.
For now it's OK my ubitx is turning on :-)
--
73's
Adrien F4IJA
|
Re: Amplifier Talk- Communications Concepts
The Motorola Helge Granberg designs are almost 30 years old now. Keep in mind they are only engineered to the level that demonstrates the functionality of a part and since then there have been important developments in materials and components. Once you understand that, designt he rest of the required circuitry and the right output filters, you might end up with a decent amp.
Alternatively, for about the same cost, less work and much more predictable results, you can find on eBay PA Units and Filter Units from old transceivers.
Cheers,
Razvan M0HZH
|
Re: 0dBm and -60dBm calibration
What I am saying here Hans is that 0dbm is no use to check an Antuino
unless
we have a 20db attenuator.
Calibrator will be useful for the Antuino between -20 and -80
Just like you are using a clock osc for signal reference, Antuino used
the internal
osc level for calibration. Its pretty accurate, worst case is 2db error
but mostly
1db. We can do better with AD8310 which is 0.5db with 20mv/dbm compared
to
AD8307 which is 1db error and 25mv/dbm. That mod will need sketch
correction.
Waiting to try that once I get back to town.
Initially drove me nuts so I call it Mentuino!
Raj
At 13/09/2019, you wrote:
toggle quoted message
Show quoted text
Hi Raj
> AFAIK the Antuino reads from -20dbm to -100dbm at the input. The IF
amp amps?
> the signal? by 30db making the -20dbm at input into +10dbm at the
AD8307. The
> sketch takes care? of the maths. Any higher level than -20 needs
external?
> attenuator (probably internal in? the next version?).
Question is - if the Antuino (or any other piece of test equipment) says
-34dBm (for example) on its screen... how do you know the accuracy of
that??
This calibration generator generates both 0dBm and -60dBm signals so the
latter would be suitable for Antuino testing.?
I do have a Dayton Antuino so could try it. But I am waiting on the
upgrade components pack...?
73 Hans G0UPL
|
Re: 0dBm and -60dBm calibration
Hi Raj
> AFAIK the Antuino reads from -20dbm to -100dbm at the input. The IF amp amps?> the signal?by 30db making the -20dbm at input into +10dbm at the AD8307. The > sketch takes care?of the maths. Any higher level than -20 needs external? > attenuator (probably internal in?the next version?).
Question is - if the Antuino (or any other piece of test equipment) says -34dBm (for example) on its screen... how do you know the accuracy of that??
This calibration generator generates both 0dBm and -60dBm signals so the latter would be suitable for Antuino testing.?
I do have a Dayton Antuino so could try it. But I am waiting on the upgrade components pack...?
73 Hans G0UPL
|
PA3GYV - Werner
MadRadioModder
Raj vu2zap