Juha
Indeed your calibration is good, and rig is behaving in CW as expected with OEM code.
As mine is a v4, someone will have to point the way to Reed's code. Yes ubitx was conceived to encourage replacement code.
Curt wb8yyy
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Located the lines in the code where cw is done. However, the code 6.3.1 in Github is
the same. Uploaded it couple of times but the thing does not change. Is there 6.3.1 in
github as the ino file is still v6.1?
Can't find the reference to the Reed's code.
Juha OH8CW
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Thanks, I'll do that
Juha oh8cw la 29. helmikuuta 2020 klo 12.55 Vic WA4THR via Groups.Io <vhklein= [email protected]> kirjoitti:
That behavior seems to be the situation on the OEM code in the V6, where the transmit signal is shifted in CW rather than the receive. Look for Reed's code as mentioned in one of the links. He fixes that behavior so that in CW the signal is shifted by the amount of the CW offset, but you transmit on the displayed frequency as it should be. You can easily tell if it is set correctly by shifting in and out of CW while receiving and you'll hear the tone change as you do. That, frankly, is the way it should be so that you listen (with the desired offset note) and transmit on the same spot.
=Vic=
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That behavior seems to be the situation on the OEM code in the V6, where the transmit signal is shifted in CW rather than the receive. Look for Reed's code as mentioned in one of the links. He fixes that behavior so that in CW the signal is shifted by the amount of the CW offset, but you transmit on the displayed frequency as it should be. You can easily tell if it is set correctly by shifting in and out of CW while receiving and you'll hear the tone change as you do. That, frankly, is the way it should be so that you listen (with the desired offset note) and transmit on the same spot.
=Vic=
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Re: V6 Low volume on speaker
One comment, the noise with no antenna is extremely low, so I would not be surprised that you have to turn the volume up full to hear anything.? If the volume is low with even a marginal antenna connected, then I would look into possible issues.? On all three of my ubitx, I get no signal at all until I touch the antenna connection to the center pole, then get a LOT of noise.
FWIW
73
Evan
AC9TU
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Re: Good spot to insert audio preamp on V6
#v6
You might want to look into this as an alternative to a pre-amp:
The tda2030a can deliver 8 watts into 8 ohms as opposed to the lm386 0.700 watts.? It would be connected between the output of the board and the speaker.? It would also add some gain to the audio.
Just a recommendation
73
Evan
AC9TU
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Re: Only noise when connected to the antenna
#v6
The audio squel may be unintended leakage, or related to 11 Mhz oscillator way out of alignment.
Maybe someone else could comment on touchscreen issues you cite. If you had a raduino that might be easier to integrate, if someone in the US could ship you a discarded one.
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Re: Only noise when connected to the antenna
#v6
Jonathan
Funny thing we learn more when we have issues.
The crystals do not need to be precisely matched for this filter, except if 2 or more styles with very different characteristics were used. First, there are a lot of connections, you could sniff each junction to see if its open or shorted. Also its fair to bypass a filter in signal tracing, just with a wire.
Now if the oscillator after this stage is not working or way off in frequency,? the crystal filter would appear to be open circuit in its network behavior.
Do use a signal generator or even touching a large enough antenna at the front and back of the filter to check the difference. The loss of a working filter should be low relative to audio level with or without it.
I don't expect your transistor choice to matter much. Farhan uses those bfr93 transistors to increase 45 MHz gain relative to various sources of leakage, that plagued the different frequency plan of the earlier versions.
Let me know as you need anything further. BTW I work with many Hokies up here.
73 curt wb8yyy
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Re: Receive current on V6 builds
It looks like the earlier version is the winner on receive current draw. The V3 idles in receive at about 210ma.? Nice to know what the v6 does.
--
73
Dave
AD0B
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Re: CW paddles Work, straight key does Not
Richard
There likely is a menu setting to designate key or paddle.
Also at least in the v4, paddle use has extra resistors that must be removed or bypassed for straight key action. The ubitx actually reads a voltage level to determine what action to perform in doing cw.
Curt
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Re: V6 Low volume on speaker
Thanks, Dick.? It seems to be a sweet radio.? I plan to use for portable operations, so maybe headphones will be all I need.? Good to know about the loud stations, though. ?
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Re: Good spot to insert audio preamp on V6
#v6
What antenna are you using Joel?
Raj
At 29-02-20, you wrote:
toggle quoted message
Show quoted text
Hi all,
I have noticed that my V6 uBITX receive audio is just a bit low
especially on 20 meters. I pretty much run the volume all way the open on
all bands and can hear okay. I was wanting to add a audio preamp,?
somewhere to pick things up a
bit. Any ideas on where might be a good spot to do that on a V6 board? It
would be easy on any of the prior versions as we had external volume
control pots, but with the pot being onboard on the V6 it makes it a bit
harder to interrupt the audio going to the wiper.
Joel
N6ALT
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Re: V6 Low volume on speaker
Hi Russ. ?I have the same problem with my new one. What helps is that I am running the audio through a JPD NIR-10 digital audio signal processor that had it's own audio amp. Now, this radio does not appear to have AGC so you will have to ride the volume for loud stations. I tried headphone and strong stations blow my ears off. 73 Dick KE5NCR ?
On Friday, February 28, 2020, 08:59:51 PM CST, RussB <russb.dba@...> wrote:
Hi,
Just finished assembling the V6 full kit. ?Something must be wrong because when I attached a LifePo battery and applied power there was no smoke. ?The display worked, the encoder worked. ?I¡¯m sure some gremlin will has something in store for me.?
I still need to hook it up to an antenna and adjust things, but from the initial power on, I noticed I had to crank the volume up all the way to hear even noise. ?There were a number of birdies on the lower end of 40 meters, but they weren¡¯t loud. I don¡¯t expect a lot of volume, and yes I am of a certain age, but so far I haven¡¯t needed hearing aids. ?
I am trying to hunt down my ear phones (they do tend to take tours of the house) and will try them in the earphone jack. ?However, outside of adding a pre-amp, is there anything anyone has found I can try?
73,
Russ WD9DD
|
Hi,
Just finished assembling the V6 full kit. ?Something must be wrong because when I attached a LifePo battery and applied power there was no smoke. ?The display worked, the encoder worked. ?I¡¯m sure some gremlin will has something in store for me.?
I still need to hook it up to an antenna and adjust things, but from the initial power on, I noticed I had to crank the volume up all the way to hear even noise. ?There were a number of birdies on the lower end of 40 meters, but they weren¡¯t loud. I don¡¯t expect a lot of volume, and yes I am of a certain age, but so far I haven¡¯t needed hearing aids. ?
I am trying to hunt down my ear phones (they do tend to take tours of the house) and will try them in the earphone jack. ?However, outside of adding a pre-amp, is there anything anyone has found I can try?
73,
Russ WD9DD
|
CW paddles Work, straight key does Not
Just finished boxing my Ubitx V5. The center paddles work fine, but the straight key pulling the 4.7k resistor to ground does not.
Anyone seen this and have a solution for straight key nights?
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Well it is working. I had Steve send me the radio. Sometimes you can just sense the frustration.
I found that R88 and r87 were both cracked. How did that happen? Also cut out the overheated melted power wires and changed the power connector around as the black was going to +12v. and red to ground. Now the color code is standard.?
I thought that the frequency and bfo calibration were excellent.
?As I mentioned, the add on boards are removed but the radio does work. When you get around to reinstalling the extra boards be sure to physically mount them into the case rather than have them float around in the case.?
--
73
Dave
AD0B
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Re: Only noise when connected to the antenna
#v6
Something I am wondering about is how I can tell if the 11 MHz filter is working properly. It seems to attenuate the signal quite a bit and when I inject a 14 MHz sine wave into the antenna line, this is the only stage where I don't see any change at the output.?
Don't know if this would be a cause but I used BFR93W transistors for both amplifier stages. I looked at the reason behind this and it seemed like it was because 2N3904 wasn't good enough at the first stage, so I don't see how that could be the issue though.?
Also, how important is it that the crystals are matched in the filter? I was pretty sure that the Cohn design was supposed to make the filter more tolerant to frequency difference.
Just trying to through out ideas as to what it could be but if anyone who has experience with this knows of things that can cause screw ups in the design please let me know.
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Re: RF power chain mods and improvements..
Initially I have done this. I believe it¡¯s fine. I then changed them to smd¡¯s. No different in performance. ?
Joe
toggle quoted message
Show quoted text
On Feb 28, 2020, at 3:48 PM, Rob French (KC4UPR) <kc4upr@...> wrote:
?As yet another follow-up to this chain... are through-hole carbon resistors sufficient for paralleling with Q96, Q11 etc?? I have plenty of old through-hole resistors.? I have no SMD resistors.? It would be nice to just use what I've got (for the additional 22 ohms in parallel) but I'm wondering if the leads will add excessive length, contributing to any other issues?
Thanks,
Rob KC4UPR
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Good spot to insert audio preamp on V6
#v6
Hi all,
I have noticed that my V6 uBITX receive audio is just a bit low especially on 20 meters. I pretty much run the volume all way the open on all bands and can hear okay. I was wanting to add a audio preamp,? somewhere to pick things up a bit. Any ideas on where might be a good spot to do that on a V6 board? It would be easy on any of the prior versions as we had external volume control pots, but with the pot being onboard on the V6 it makes it a bit harder to interrupt the audio going to the wiper.
Joel
N6ALT
|
Re: Only noise when connected to the antenna
#v6
Not sure why, but even after doing this fix I get no receive when I hook up to antenna. I should easily be able to hear WWV or FT-8 but nothing. All I can hear is a high pitched whine that only goes away when I disconnect the demodulator from the audio amplifier section. I know that the signal is propagating through to at least the demodulator stage (after the 11 MHz filter). It was pretty hard to see if the 11 MHz signal was being converted to audio at that point with the spectrum analyzer or oscilloscope.
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Vic WA4THR
_Dave_ AD0B
Raj vu2zap
Jonathan Kayne, KM4CFT
Joel Caulkins/N6ALT