Topics

[BITxV6] Rcvr audio quality & diagnostic processes

Andy_501
 

Propagation here at my qth is and has been very poor for a long time.

In the documentation it states startup setup menu on power up and adjust
for 10MHz base ref freq exactly then set the BFO freq.

I am unable to get a base ref freq of 10 MHz to start with; mine will
only adjust to 10500. I have set BFO to 11.055.

I am unable to hear strong HF white noise and/or any of the CHU Canada
or WWV time broadcasts but I can obtain a couple of AM broadcast
stations; however the demodulated audio not being in AM mode is Donald
Ducky sounding but partially intelligent albeit rather weak both on
built in speaker and/or on ext powered amplified USB speaker connected
via the SPKR jack.

I am unable to tune through either side of the signal to get to get rid
of the donald duck sounding?? quality audio signal to listen to.

Seems as though audio passband is so narrow or restricted that listening
to a full sideband { 300-3000 Hz} is not possible. Is there a
calibration or software adjustment I can make on an immediate or test
basis using the Arduino immediate editor to adjust this. I am not very
happy with the receive so far.

I have the Arduino IDE installed per online instructions but not experienced
in using it regularly yet. (haven't got enough practical time/experience to sort
out the 17M unselectable fix yet even.

 Also I noticed when I set the freq to anything below 1 MHz like 920KHz,
990Khz or 680 KHz and save it the VFO indicator adds an extra zero in
the display so 990AM KHz would appear as 9.9MHz on the display but the
audio signal is the 990 AM audio. If I select 1290 KHz?? AM the VFO
display reads correctly and audio is what I expect to hear (except for
the water barrel or Donald Ducky audio quality).

I have a kiwiSDR registered on sdr.hu under my callsign name and it can
produce reasonable sigs for WWV and CHU yet the BITXv6 doesn't when I
compare it.

Any suggestions? all help/tips gratefully accepted.

73 de ve4per / Andy

howard winwood G4GPF
 

Have you set the BFO?

On 6 Jan 2020, at 19:49, Andy_501 <@ciw501_Andy_ve4per> wrote:

Propagation here at my qth is and has been very poor for a long time.

In the documentation it states startup setup menu on power up and adjust
for 10MHz base ref freq exactly then set the BFO freq.

I am unable to get a base ref freq of 10 MHz to start with; mine will
only adjust to 10500. I have set BFO to 11.055.

I am unable to hear strong HF white noise and/or any of the CHU Canada
or WWV time broadcasts but I can obtain a couple of AM broadcast
stations; however the demodulated audio not being in AM mode is Donald
Ducky sounding but partially intelligent albeit rather weak both on
built in speaker and/or on ext powered amplified USB speaker connected
via the SPKR jack.

I am unable to tune through either side of the signal to get to get rid
of the donald duck sounding?? quality audio signal to listen to.

Seems as though audio passband is so narrow or restricted that listening
to a full sideband { 300-3000 Hz} is not possible. Is there a
calibration or software adjustment I can make on an immediate or test
basis using the Arduino immediate editor to adjust this. I am not very
happy with the receive so far.

I have the Arduino IDE installed per online instructions but not experienced
in using it regularly yet. (haven't got enough practical time/experience to sort
out the 17M unselectable fix yet even.

Also I noticed when I set the freq to anything below 1 MHz like 920KHz,
990Khz or 680 KHz and save it the VFO indicator adds an extra zero in
the display so 990AM KHz would appear as 9.9MHz on the display but the
audio signal is the 990 AM audio. If I select 1290 KHz?? AM the VFO
display reads correctly and audio is what I expect to hear (except for
the water barrel or Donald Ducky audio quality).

I have a kiwiSDR registered on sdr.hu under my callsign name and it can
produce reasonable sigs for WWV and CHU yet the BITXv6 doesn't when I
compare it.

Any suggestions? all help/tips gratefully accepted.

73 de ve4per / Andy



Andy_501
 

Just adjustment of  the setup bfo freq  are you referring to something else? I haven't got into using arduino edits to this point if there are software settings that can be modified.

On 2020-01-06 14:21, howard winwood G4GPF wrote

Have you set the BFO?

On 6 Jan 2020, at 19:49, Andy_501 <@ciw501_Andy_ve4per> wrote:

Propagation here at my qth is and has been very poor for a long time.

In the documentation it states startup setup menu on power up and adjust
for 10MHz base ref freq exactly then set the BFO freq.

I am unable to get a base ref freq of 10 MHz to start with; mine will
only adjust to 10500. I have set BFO to 11.055.

I am unable to hear strong HF white noise and/or any of the CHU Canada
or WWV time broadcasts but I can obtain a couple of AM broadcast
stations; however the demodulated audio not being in AM mode is Donald
Ducky sounding but partially intelligent albeit rather weak both on
built in speaker and/or on ext powered amplified USB speaker connected
via the SPKR jack.

I am unable to tune through either side of the signal to get to get rid
of the donald duck sounding?? quality audio signal to listen to.

Seems as though audio passband is so narrow or restricted that listening
to a full sideband { 300-3000 Hz} is not possible. Is there a
calibration or software adjustment I can make on an immediate or test
basis using the Arduino immediate editor to adjust this. I am not very
happy with the receive so far.

I have the Arduino IDE installed per online instructions but not experienced
in using it regularly yet. (haven't got enough practical time/experience to sort
out the 17M unselectable fix yet even.

Also I noticed when I set the freq to anything below 1 MHz like 920KHz,
990Khz or 680 KHz and save it the VFO indicator adds an extra zero in
the display so 990AM KHz would appear as 9.9MHz on the display but the
audio signal is the 990 AM audio. If I select 1290 KHz?? AM the VFO
display reads correctly and audio is what I expect to hear (except for
the water barrel or Donald Ducky audio quality).

I have a kiwiSDR registered on sdr.hu under my callsign name and it can
produce reasonable sigs for WWV and CHU yet the BITXv6 doesn't when I
compare it.

Any suggestions? all help/tips gratefully accepted.

73 de ve4per / Andy



Evan Hand
 

Andy,

I have found that the BFO adjustment will make the uBitx sound terrible, tinny and full of high pops. Adjusted properly, the rigs (I have 3) all sound good.  Not great like my IC-7300, but good.

I would recommend trying the attached procedure, assuming that you have a device with internet and mic capability.  It works well, and will let you know visually that the rig's BFO is adjusted as best it can be.
https://www.hfsignals.com/index.php/bfo-tuning-aid/

NOTE: you will need a microphone connected and allow access to it to use the audio spectrum analyzer on the HFSignals web page. It works with my ipads and iphones if you do not have a pc/laptop with mic.

Original post from Farhan:
https://groups.io/g/BITX20/message/74079

73
Evan
AC9TU

Alex Netherton
 

Oddly, I was able to tune my BFO by tuning into a net on 40 meters (I think it was at 7.185 or so) and getting Net Control very loud. It was like a miracle when all of a sudden I could hear a human voice on my radio! After that, CW sounded good too.

I am really happy with this little thing; I never managed to build a Heathkit (Griefkit), as they were out of business when I came along (their products were expensive, even in kit form - you were better off buying a Swan), so this has been en experience! I am hoping I can get a Baofeng mic to work on this thing, so I can see if transmit works. Also, going to wire up an old straight key to see if I can send CW - hope this thing does not have a built in keyer...
73 all!


On Mon, Jan 6, 2020 at 2:50 PM Andy_501 <andrew.webb.501.ve4per@...> wrote:
Propagation here at my qth is and has been very poor for a long time.

In the documentation it states startup setup menu on power up and adjust
for 10MHz base ref freq exactly then set the BFO freq.

I am unable to get a base ref freq of 10 MHz to start with; mine will
only adjust to 10500. I have set BFO to 11.055.

I am unable to hear strong HF white noise and/or any of the CHU Canada
or WWV time broadcasts but I can obtain a couple of AM broadcast
stations; however the demodulated audio not being in AM mode is Donald
Ducky sounding but partially intelligent albeit rather weak both on
built in speaker and/or on ext powered amplified USB speaker connected
via the SPKR jack.

I am unable to tune through either side of the signal to get to get rid
of the donald duck sounding?? quality audio signal to listen to.

Seems as though audio passband is so narrow or restricted that listening
to a full sideband { 300-3000 Hz} is not possible. Is there a
calibration or software adjustment I can make on an immediate or test
basis using the Arduino immediate editor to adjust this. I am not very
happy with the receive so far.

I have the Arduino IDE installed per online instructions but not experienced
in using it regularly yet. (haven't got enough practical time/experience to sort
out the 17M unselectable fix yet even.

  Also I noticed when I set the freq to anything below 1 MHz like 920KHz,
990Khz or 680 KHz and save it the VFO indicator adds an extra zero in
the display so 990AM KHz would appear as 9.9MHz on the display but the
audio signal is the 990 AM audio. If I select 1290 KHz?? AM the VFO
display reads correctly and audio is what I expect to hear (except for
the water barrel or Donald Ducky audio quality).

I have a kiwiSDR registered on sdr.hu under my callsign name and it can
produce reasonable sigs for WWV and CHU yet the BITXv6 doesn't when I
compare it.

Any suggestions? all help/tips gratefully accepted.

73 de ve4per / Andy





--
Alex Netherton, W5ALX
Buncombe County NC, EM85ro

Andy_501
 

When you refer to setting the BFO do you mean you tuned the receiver to 7.185 and then entered the power on reset setup utility and adjust the beat freq final adjustment for best audio quality in speaker or headset at that time? or are you using another program residing on the associated laptop and remotely adjusting via the USB comm port to effect changes. I don't have a separate BFO adjustment when it is operating normally. I can adjust the CW Sidetone freq but that is all.

On 2020-01-08 6:15 p.m., Alex Netherton wrote:
Oddly, I was able to tune my BFO by tuning into a net on 40 meters (I think it was at 7.185 or so) and getting Net Control very loud. It was like a miracle when all of a sudden I could hear a human voice on my radio! After that, CW sounded good too.

I am really happy with this little thing; I never managed to build a Heathkit (Griefkit), as they were out of business when I came along (their products were expensive, even in kit form - you were better off buying a Swan), so this has been en experience! I am hoping I can get a Baofeng mic to work on this thing, so I can see if transmit works. Also, going to wire up an old straight key to see if I can send CW - hope this thing does not have a built in keyer...
73 all!


On Mon, Jan 6, 2020 at 2:50 PM Andy_501 <andrew.webb.501.ve4per@...> wrote:
Propagation here at my qth is and has been very poor for a long time.

In the documentation it states startup setup menu on power up and adjust
for 10MHz base ref freq exactly then set the BFO freq.

I am unable to get a base ref freq of 10 MHz to start with; mine will
only adjust to 10500. I have set BFO to 11.055.

I am unable to hear strong HF white noise and/or any of the CHU Canada
or WWV time broadcasts but I can obtain a couple of AM broadcast
stations; however the demodulated audio not being in AM mode is Donald
Ducky sounding but partially intelligent albeit rather weak both on
built in speaker and/or on ext powered amplified USB speaker connected
via the SPKR jack.

I am unable to tune through either side of the signal to get to get rid
of the donald duck sounding?? quality audio signal to listen to.

Seems as though audio passband is so narrow or restricted that listening
to a full sideband { 300-3000 Hz} is not possible. Is there a
calibration or software adjustment I can make on an immediate or test
basis using the Arduino immediate editor to adjust this. I am not very
happy with the receive so far.

I have the Arduino IDE installed per online instructions but not experienced
in using it regularly yet. (haven't got enough practical time/experience to sort
out the 17M unselectable fix yet even.

  Also I noticed when I set the freq to anything below 1 MHz like 920KHz,
990Khz or 680 KHz and save it the VFO indicator adds an extra zero in
the display so 990AM KHz would appear as 9.9MHz on the display but the
audio signal is the 990 AM audio. If I select 1290 KHz?? AM the VFO
display reads correctly and audio is what I expect to hear (except for
the water barrel or Donald Ducky audio quality).

I have a kiwiSDR registered on sdr.hu under my callsign name and it can
produce reasonable sigs for WWV and CHU yet the BITXv6 doesn't when I
compare it.

Any suggestions? all help/tips gratefully accepted.

73 de ve4per / Andy





--
Alex Netherton, W5ALX
Buncombe County NC, EM85ro