Hello Still chasing my MIC issue which matches this post /g/BITX20/topic/no_mic_audio/19202825?p=,,,20,0,0,0::recentpostdate%2Fsticky,,,20,2,0,19202825 There is mention made of seeing about 12v on the mic transistor circuit at R66 and C64, with an unplugged mic. This 12v can only be seen however with ptt enabled from what I can see in the schematic. Just making sure I understand the circuit properly here Thanks Laurence
On Wed, Mar 13, 2019 at 11:50 PM Raj vu2zap <rajendrakumargg@...> wrote:
Wiring looks correct however if the mic jack if not inserted properly
or any other improper wiring on the mic/ptt there may be a short
of ptt line and mic line..
To check, remove the PTT line from the socket and wire a switch
separately and see if the mic voltage comes up or audio increase.
Raj
At 14/03/2019, you wrote:
Hello Raj
Here is a picture of my connections all run true to the board and the Raduino.
The Key and the headphone are working fine, the radio is clean and
doing well on CW, both V4 and V5
The purple goes to the Raduino MIC pin Orange to the PTT but I have
low audio and the wrong Voltage.
Can anybody see an issue here.
When I key the MIC I see the carrier but its almost like the Audio is
not getting modulated on the carrier.
I have not done any BFO adjustment yet.
Thanks
Laurence
On Wed, Mar 13, 2019 at 10:12 AM Laurence Oberman <oberman.l@...> wrote:
Hello Raj
So both V4 and V5 show about 5v only on the Violet wire for the MIC
pin when I press PTT and go into TX.
I am measuring between the MIC pin and ground when I see about 5v.
Are you seeing 10v when you press PTT and measure. Is that 10v
Peak-to-Peak between the PTT pin and the MIC pin
i.e. -5v to +5v
I will re-calibrate the BFO as well
On Wed, Mar 13, 2019 at 8:18 AM Laurence Oberman <oberman.l@...> wrote:
Hello Raj
I am checking, I know the electret was correctly polarized on the V4.
I will test with it disconnected and just enabling PTT. I need to put
the V5 back in and check.
The reason I started looking into this was my audio gain was very low
with the mic.
In fact almost no signal seen when talking into the Mike, only visible
with a loud whistle on the scope.
Thanks
Laurence
On Wed, Mar 13, 2019 at 2:48 AM Raj vu2zap <rajendrakumargg@...> wrote:
Laurence,
You should see about 10V approx.
I think your electret mic polarity is wrong. The solder pad connected to the can of the mic is -ve or grounded.
Raj
At 12/03/2019, you wrote:
Hello
What is the expected mic pin voltage when you press PTT on a v4 and V5 board.
I am seeing 4.8v on V5 seems low to me. The V4 was about 5.2v.
Thanks
Laurence
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Re: #bitx40 Display questions
#bitx40
I got that. I am using a larger 16x2 display.?
What i can¡¯t figure out is what data pins on the ?Raduino go to?
which ones on the larger display. I attached the datasheet to the original post. ?
It is powered on and the backlight works fine.
It is displaying solid dots.
The display that came with the kit works fine.
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I'd be in.
Vince
N1VIN
On 3/16/2019 8:25 AM, Ted via Groups.Io
wrote:
toggle quoted message
Show quoted text
I thought about ordering that
very pack and making the rest available for a SASE and a buck.?
Is anyone else
in need?? If so, speak up, please.
Ted
K3RTA
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Mould you please try that again? The name of the source or seller is hard to make out.
Thanks!
-ted
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Check yhis vey site. Om mike bought Nd wS distributing within usa
On Sat, 16 Mar 2019, 4:50 pm Mike via Groups.Io <mikeymustang2000= [email protected] wrote: All,
Is there anyone in the states have 2 of 680nH 1210 for the spur fix that they would like to sell? I can get them on ebay but, I do not need 300 of them LOL!
Thank you!
Mike WA3O
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I thought about ordering that very pack and making the rest available for a SASE and a buck.?
Is anyone else in need?? If so, speak up, please.
Ted K3RTA
|
Re: Opinions on 510 replacement?
Hi Curt,
All great points and I have an agc ready to go in!
73 de KB1HYR
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Re: How to connect ubitx microphone jack to soundcard output
Hello Jerry,
Thanks for the reply and suggestions of where to look.?? I would guess it has something to do with me feeding the ubitx microphone input directly from the line output from a C Media soundcard dongle.? I had no isolation transformer or blocking cap in between the two until I installed the EasyDigi.? SSB worked fine ten days ago, but since then, I've continued to attempt to interface the ubitx and soundcard with just a 3.5 mm stereo cable.
I haven't dropped the radio, or touched the calibration of the BFO.? I thought about reloading the configuration I've been happy with, but didn't want to unless absolutely necessary.
I've been using the radio on CW for a year now and SSB infrequently without issue.
Your comment "Applying several volts of audio to the modulator somehow, enough to blow the diodes?" is what I suspect the problem could be.? I would guess the soundcard line output is somewhere around 5V.
Karl, W5QJ
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Re: How to connect ubitx microphone jack to soundcard output; now unsuppressed carrier in SSB or digital modes.
Hello Jerry,
Thanks for the reply and suggestions of where to look.?? I would guess it has something to do with me feeding the ubitx microphone input directly from the line output from a C Media soundcard dongle.? I had no isolation transformer or blocking cap in between the two until I installed the EasyDigi.? SSB worked fine ten days ago, but since then, I've continued to attempt to interface the ubitx and soundcard with just a 3.5 mm stereo cable.
I haven't dropped the radio, or touched the calibration of the BFO.? I thought about reloading the configuration I've been happy with, but didn't want to unless absolutely necessary.
I've been using the radio on CW for a year now and SSB infrequently without issue.
Your comment "Applying several volts of audio to the modulator somehow, enough to blow the diodes?" is what I suspect the problem could be.? I would guess the soundcard line output is somewhere around 5V.
Karl, W5QJ
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Re: CEC< 1.122 For V5 CW BFO adjustment
Vic,
?I did verify that the frequency I TX on (via the reverse beacon network) is the same as the display. so I think I might be okay?
Thanks
Mike WA3O
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All,
Is there anyone in the states have 2 of 680nH 1210 for the spur fix that they would like to sell? I can get them on ebay but, I do not need 300 of them LOL!
Thank you!
Mike WA3O
|
I don't know about the ringing/echo problem, but I needed to add an automotive electrical noise filter to my BitX40 to run it mobile. I had an old Radio Shack 270-051B unit in my junk box and installed it in the rig case. It completely eliminated the loud alternator whine and I have used my BitX40 mobile several times.
As an aside, I just tested my uBitX in the same vehicle with no added filter and I am not hearing any alternator whine with it. Not sure why, but that is good.
=Vic=
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Re: CEC< 1.122 For V5 CW BFO adjustment
The offset is controlled by the setting for CW tone up in the CW section. Any value put in to the CW Freq Adjust section adds to that, so you should leave that section as zero, then you will be transmitting on the display frequency. Otherwise you still will be offset somewhat. I am not sure what use the CW Freq. Adjust has...just make that zero. 
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Re: Received my ubitx board today!
Hi Kelly, ???????????? From a cold,windy and wet United kingdom.Good luck with the build on the ubitx,i have a version 3 as my main station with KD8 CEC firmware and normal lcd display,i have added an external G3 CWI an external cw filter no other mods,i do not own any commercail radios i am all homebrew,please view my qrz page..Again take your time and read all the info available on this excellent site.Dave G0AYD.
Hi everyone! I am very happy and some what nervous that my ubitx arrived from India this morning...very fast shipping.? I am in agony as I cannot work on it until next Tuesday due to family obligations....LOL. Oh well, at least its HERE. I plan to enjoy the build.?
The first mod will be adding the Nextion display and the CEC fw...
73, Kelly K5AID?
Sent from my Verizon, Samsung Galaxy smartphone
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Re: #bitx40 Display questions
#bitx40
Confirming what Mike is saying, the 16x2 parallel LCD display attaches to the header on the opposite side of the Raduino board from the connectors shown in the wire up diagram. Likely it should just plug in and contrast control is provided on the board. You have what appears to be a parallel display, as opposed to serial, so it should work.
=Vic=
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Received my ubitx board today!
Hi everyone! I am very happy and some what nervous that my ubitx arrived from India this morning...very fast shipping.? I am in agony as I cannot work on it until next Tuesday due to family obligations....LOL. Oh well, at least its HERE. I plan to enjoy the build.?
The first mod will be adding the Nextion display and the CEC fw...
73, Kelly K5AID?
Sent from my Verizon, Samsung Galaxy smartphone
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Hi Jon,
It's worth a try.? Searching back in posts, Allison did test the pn vs 2n and found the pn not as good, but it was still better than the 2n3904.? Probably it will depend on the quality and manufacturer of the pn part (although I think pn was specific to TI so it should be good quality, but there are lots of parts out there!)
If they don't work out let me know, I can try to find some 2n2222a or 2n5109 from my supplies to send you.
73,
Mark.
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Re: #bitx40 Display questions
#bitx40
Hi Mike,
The display hooks up to a raduino, not directly to the arduino.? Do you have the raduino board too?? I don't have a bitx40, but I thought those came with one.? Or are you building it from scratch?
73,
Mark.
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Re: #bitx40 Display questions
#bitx40
Can anyone look at this and help?
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Thanks Mark, guna use em.
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Ted
Vic WA4THR