Re: #uBITX Firmware KD8CEC - IF-Shift etc.
#ubitx
One more complication,
Post 44182 puts clk1 at 57995000 for USB and 32997000 for LSB.
They can both be adjusted up and down by some equal number of hz?
to compensate for differences in where the center of the 45mhz passband is.
But this all assumes that the center of the sideband of interest is 1500 hz
from the carrier.??
We may need to move the USB and LSB values for clk1 independently
when the PBT function changes that figure of 1500 hz by a few hundred Hz.
But the effect of a few hundred Hz should be far less noticeable
than the current difference of around 4khz.?
Good thing the math here is all just addition and subtraction,?
nothing complicated.? ;-)
Jerry, KE7ER
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On Sun, Mar 11, 2018 at 12:16 pm, Jerry Gaffke wrote:
Yes, the passband of the 12mhz filter can vary by rig.
The fix is using a PBT function within the configuration menu
to get the best audio on an LSB signal.
Could be that the 45mhz passband varies significantly by rig as well, making USB sound different than LSB.
So symptoms like what Gerald's original post to this thread describes.
If so, we need another configuration menu item to scoot around clk1 an equal amount for USB and LSB
as described in post 44182:
> If the 45mhz crystal filter sweeps out to be somewhere else, then add the difference to those two figures.
> For example, if the center is found to be at 44.997mhz (so 2khz higher) then the two figures for clk1
> should be 56995000 hz and 32999000 hz.
?
Should be able to do this all by ear if stuff is working but just off a bit in frequency.
If not working, then might need a diode RF probe or Nik's AD8307.
Plotting from the Raduino onto the USB host could be done as per post 32630.
Jerry, KE7ER
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Re: [uBiTx] last frequency memory?
Upgrade to the KD8CEC firmware
(requires no hardware mods) as this remembers your last tuned
frequency ...
M
On 12/03/18 1:36 AM, sulu82@... wrote:
I have the same
problem.Mine defaults at 7.350.
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Re: The issues of the TDA2822
Fahran,
That is ok, but can you answer my question?
"I placed an order few days ago... Does that mean that I will have normal chip that doesn't need any mods? Maybe just lowering voltage with 78L09?"
Thank you in advance.
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Re: BITX QSO Afternoon/Night, Sunday, March 11, 3PM/7PM Local Time, 7277 kHz in North America, 7177 kHz elsewhere
I am KM4TLR. That may be the second station you were trying to identify.
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Re: BITX QSO Afternoon/Night, Sunday, March 11, 3PM/7PM Local Time, 7277 kHz in North America, 7177 kHz elsewhere
only just heard WA4THR and xxxDLR???? very weak sigs so far.?
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Re: BITX QSO Afternoon/Night, Sunday, March 11, 3PM/7PM Local Time, 7277 kHz in North America, 7177 kHz elsewhere
Just had a QSO with WA4THR. Signal was 5/5 at one point but faded completely out in a matter of seconds.?
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, bitx voices3PM/7PM Local Time, 7277 kHz in North America, 7177 kHz elsewhere
Yeah
Hearing some bits of bitx voices. on 72769khz
Heard band shifted louder then it stopped.
Listening.
KE0PVO
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Re: #uBITX Firmware KD8CEC - IF-Shift etc.
#ubitx
Yes, the passband of the 12mhz filter can vary by rig.
The fix is using a PBT function within the configuration menu
to get the best audio on an LSB signal.
Could be that the 45mhz passband varies significantly by rig as well, making USB sound different than LSB.
So symptoms like what Gerald's original post to this thread describes.
If so, we need another configuration menu item to scoot around clk1 an equal amount for USB and LSB
as described in post 44182:
> If the 45mhz crystal filter sweeps out to be somewhere else, then add the difference to those two figures.
> For example, if the center is found to be at 44.997mhz (so 2khz higher) then the two figures for clk1
> should be 56995000 hz and 32999000 hz.
?
Should be able to do this all by ear if stuff is working but just off a bit in frequency.
If not working, then might need a diode RF probe or Nik's AD8307.
Plotting from the Raduino onto the USB host could be done as per post 32630.
Jerry, KE7ER
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On Sun, Mar 11, 2018 at 11:54 am, Michael Shreeve wrote:
Also, seems like Ashar, some time back, not sure he was talking about BITX40 or uBITX had said that the crystals used for these passbands were not always using quite the same frequency due to the fact that the folks he had making the crystals were not always providing accurate crystals ? He indicated that they would go through the crystals and match them for a group.? So , occasionally , if this is true, the passband of the filter could be different a kc or two ? A Vector Analyzer or tracking generator plus scope could verify this, but, you'd need access to a bunch of radios.?
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Re: BITX QSO Afternoon/Night, Sunday, March 11, 3PM/7PM Local Time, 7277 kHz in North America, 7177 kHz elsewhere
I'm on 7277. Very quiet. Anyone else out there?
--
John - WA2FZW
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Re: #uBITX Firmware KD8CEC - IF-Shift etc.
#ubitx
Also, seems like Ashar, some time back, not sure he was talking about BITX40 or uBITX had said that the crystals used for these passbands were not always using quite the same frequency due to the fact that the folks he had making the crystals were not always providing accurate crystals ? He indicated that they would go through the crystals and match them for a group.? So , occasionally , if this is true, the passband of the filter could be different a kc or two ? A Vector Analyzer or tracking generator plus scope could verify this, but, you'd need access to a bunch of radios.?
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Re: #uBITX Firmware KD8CEC - IF-Shift etc.
#ubitx
So we have two knobs to twiddle during receive:
? ? RIT:? Change the tuning on receive only.
? ? PBT:? Change the tuning and the BFO, both in sync
This post suggests that "Clarify" is just another name for "RIT".
In post 44223, I said this, I still think it's right but am open to arguments:
>? ? Yes, changing only the BFO when trying to listen to a signal is generally a bad idea.
We need a PBT to set the default position of BFO relative to 12mhz filter passband during calibration.
We also need a receive only version, perhaps call it RI-PBT?
Then if the other end is tuned up for somebody with a high pitched voice
or if there is a nearby carrier that we wish to get rid of,
we can adjust our receiver to compensate without disturbing our transmission.
Jerry
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On Sun, Mar 11, 2018 at 11:12 am, Allard PE1NWL wrote:
yes, PBT and "clarifier" are indeed two different things.
When I implemented this functionality in the Raduino v2 sketch for BitX40,
I initially called it "clarifier", however later I realised this was not
the correct term. I later renamed it to Pass Band Tuning as I believe that
is more appropriate.
Whatever you call it, technically it allows the operator to shift the BFO
frequency during RX, and at the same time the VFO frequency is shifted by
the same amount (so that the relationship of the BFO to the suppressed
carrier is not affected).
If you still have a BitX40, try it out this simple mod and you will be
amazed about this feature.
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On 11 Mar 2018 17:58, "ekelley" < ekelley828@...> wrote: Guys & Gals,
I didn't want to leave anyone out. I just thought I should remind everyone that this is a forum for the BitX (all BitX's). It is made up with thousands of radio amateurs who want to expand and enjoy their hobby. I have been licensed for 64 years now. I am a Technician (not an Engineer). I fix things, build them, troubleshoot them, analyze them, I read schematics, what I don't do is design things! Farhan has done an excellent job with the BitX and has made many improvements to his designs. He has put out a quality product that thousands have enjoyed using. Basically the BitX is a great entry level transceiver that is affordable for all. It is not a perfect transceiver, but that is what this forum is for, to share modifications, improvements, and new ideas with each other. We do have outstanding Engineers on this forum. No matter what your background is, there is help for you on this forum. If it doesn't work, someone will help you troubleshoot and find the answer. There is no warranty on the BitX. It is being offered that way to keep the costs down. I have one of the first uBitX's shipped. I put it together in a small chassis, I found a few mistakes and I fixed them. My output power with 12.6 volts applied is about 8 watts on 40 meteres. My first contact was 1500 miles away with a S9 report. I'm almost afraid to add any mods to it since it works sooo good. For beginners, when you get your uBitX, I have a few suggestions, First, follow the instructions, do not try to read the schematic, use the pictures in the instructions for placement of the colored wires. For the 3.5 mm speaker jack, do not jumper the tip to the ring, this will prevent shorting audio out when a mono plug is inserted. Last suggestion - It is a QRP transceiver, don't try to get more power out of it! If you need more power, use an external amplifier, there is a file on this forum on how to do this. Most power supplies run up to 13.8 volts, don't go over that, I chose 12.6 volts and nothing gets hot and I can use digital. Lastly, respect everyone on this group, we are from all over the world and we are all friends in our hobby.
Ed W0OIC
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I've been playing with Ashar's AGC circuit on my BitX40, and it seems to work pretty well if I add additional capacitance across C113 ( I added 4.7uf in parallel because that's what I had on hand) to build back some of the level and actually improve the fidelity. Watching the voltage change on the gate of the 2N7000 looks like it would be a great spot to tap for an S-meter input to the Raduino. Has anyone tried this? The voltage is pretty low, but changes smoothly with the level of signal.
=Vic=
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Re: #uBITX Firmware KD8CEC - IF-Shift etc.
#ubitx
Whoops, that did not get stated in post 44182.? My apologies.? (Was in the earlier draft mentioned in post 44228)
Has been discussed in the forum here several times, though that was a few thousand posts ago.
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On Sun, Mar 11, 2018 at 09:40 am, Jerry Gaffke wrote:
No, the BFO is always below the 12mhz filter passband, if above then harmonics beat with an oscillator on the Nano.
As stated in post 44182.
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Re: #uBITX Firmware KD8CEC - IF-Shift etc.
#ubitx
Hi Tim,
yes, PBT and "clarifier" are indeed two different things.
When I implemented this functionality in the Raduino v2 sketch for BitX40,
I initially called it "clarifier", however later I realised this was not
the correct term. I later renamed it to Pass Band Tuning as I believe that
is more appropriate.
Whatever you call it, technically it allows the operator to shift the BFO
frequency during RX, and at the same time the VFO frequency is shifted by
the same amount (so that the relationship of the BFO to the suppressed
carrier is not affected).
If you still have a BitX40, try it out this simple mod and you will be
amazed about this feature.
73 Allard PE1NWL
toggle quoted message
Show quoted text
On Sun, March 11, 2018 16:11, Tim Gorman wrote: Allard,
I don't think I agree with you. PBT and "clariier" are two different
things.
A "clarifer" or incremental tuning control is only useful for tuning an
off-frequency signal. The BFO must be at the suppressed carrier
frequency for proper detection of a SSB signal. If you deviate from that
frequency then the detected audio becomes distorted, the old "donald
duck" sound spoken of by the old-timers. One of my first
ham-band receivers was an old RME-4350, 1950's vintage. It had a "BFO"
control which was really useful on SSB because in a round-table not all
transmitters could be set to the exact same frequency - resolution of
1kc was pretty good! The BFO could be used to tune everyone in properly,
in essence it was what is today called an "receiver incremental tuning"
control.
Passband tuning (or IF Shift) does not impact the relationship of the
BFO to the suppressed carrier at all. You could do the IF Shift by
changing CLK1 in order to shift where the signal impacts the 12Mhz
passband of the SSB filter but CLK0 would still have to maintain the
same relationship to CLK2 in order to demodulate the signal properly.
tim ab0wr
On Sun, 11 Mar 2018 01:09:24 +0100
"Allard PE1NWL" <pe1nwl@...> wrote:
Jerry,
I believe it works in a similar way as the PBT (or "clarifier")
function in the Raduino v2 software for Bitx40.
It allows the user to slightly shift the BFO frequency from the
frontpanel (only during RX of course).
It's not IF shift in its true sense, but the behaviour is quite
similar. I have the impression that not many BitX40 builders actually
installed this mod, which has always surprised me as I personally
find it a very useful feature.
73 Allard PE1NWL
On Sun, March 11, 2018 00:52, Jerry Gaffke via Groups.Io wrote:
OK, so IF-Shift is just a BFO offset (relative to the crystal filter
passband)????
that is for receive only, the transmit BFO offset generally stays
put. Makes sense.
I went off into the weeds there because Gerald's original query
stated that
????In LSB I can adjust the received sound with the IF-Shift with a
very pleasing effect, but this does not work the same with USB. Sounded like there was something more going on.
But could be just that the code didn't quite handle the USB case
correctly.
Yes, eventually I'll move on to try some of the newer software.
But for now have my hands full with other projects.
Jerry????????
On Sat, Mar 10, 2018 at 02:49 pm, Mike Woods wrote:
Most commercial rigs have an IF Shift or Passband Tuning (PBT)
control.????
This control can help with removal of QRM on receive ( e.g.by (
) eliminating a strong carrier or another station on
the edge
of the passband by shifting the passband up or down by a few 100
Hz. It can also compensate for a poorly adjusted frequency
response on a signal that is being received (too bassy or too
trebly).?? ????
Ian????????s software implements just such a control.???? It
functions in
a similar
manner to the BFO calibration routine, in fact, but unlike the
calibration
function, it should only operate on RX. This was the bug - it
didn????????t turn
off on TX.???? I checked on my uBITx and found the same problem here.
????
If you haven????????t tried the KD8CEC firmware you should.???? It
has a
number of
other worthwhile software features!
????
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Re: ubitx mount question regarding lcd display and bezel
Here is a solution that I used..
QRP- labs.com /enclosures front panel .
There are unmarked panels that the display fits in,with four holes around the display that the jacks fit into nicely .
I'm not sure how long shipping will take from Japan,but I bought a few for later projects .
It is nice to have extra stuff sometimes.
73
Dennis
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Guys & Gals,
I didn't want to leave anyone out. I just thought I should remind everyone that this is a forum for the BitX (all BitX's). It is made up with thousands of radio amateurs who want to expand and enjoy their hobby. I have been licensed for 64 years now. I am a Technician (not an Engineer). I fix things, build them, troubleshoot them, analyze them, I read schematics, what I don't do is design things! Farhan has done an excellent job with the BitX and has made many improvements to his designs. He has put out a quality product that thousands have enjoyed using. Basically the BitX is a great entry level transceiver that is affordable for all. It is not a perfect transceiver, but that is what this forum is for, to share modifications, improvements, and new ideas with each other. We do have outstanding Engineers on this forum. No matter what your background is, there is help for you on this forum. If it doesn't work, someone will help you troubleshoot and find the answer. There is no warranty on the BitX. It is being offered that way to keep the costs down. I have one of the first uBitX's shipped. I put it together in a small chassis, I found a few mistakes and I fixed them. My output power with 12.6 volts applied is about 8 watts on 40 meteres. My first contact was 1500 miles away with a S9 report. I'm almost afraid to add any mods to it since it works sooo good. For beginners, when you get your uBitX, I have a few suggestions, First, follow the instructions, do not try to read the schematic, use the pictures in the instructions for placement of the colored wires. For the 3.5 mm speaker jack, do not jumper the tip to the ring, this will prevent shorting audio out when a mono plug is inserted. Last suggestion - It is a QRP transceiver, don't try to get more power out of it! If you need more power, use an external amplifier, there is a file on this forum on how to do this. Most power supplies run up to 13.8 volts, don't go over that, I chose 12.6 volts and nothing gets hot and I can use digital. Lastly, respect everyone on this group, we are from all over the world and we are all friends in our hobby.
Ed W0OIC
|
Michael, would you provide a link to your kits?
Thanks, Roy WA0YMH
On Mar 11, 2018 12:42 PM, "Michael Hagen" < motdog@...> wrote:
Here is the STL file
for my Bezel.? As most know, 3D printing is hit and miss.
My kit includes the
Bezel, Metric Flat head screws, sheet metal screws, ABS
standoff, and ABS 1/8" spacers for
using original metal
standoffs or all Plastic.? It was for orginal BitX on a 1/16"
al. panel, uBit users may have to improvise.
Have at it, it takes
about 1 1/2 hr. to print and I get to throw out 1 out of 3
prints because of warping (pulling up at the ends).
73's Mike
On 3/11/2018 9:15 AM, Lawrence
Macionski via Groups.Io wrote:
WA6ISP has them for
sale in his catalog list -$4.00
Larry- W8LM
--
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID "MotDog@..."
Mike@...
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Here is the STL file
for my Bezel.? As most know, 3D printing is hit and miss.
My kit includes the
Bezel, Metric Flat head screws, sheet metal screws, ABS
standoff, and ABS 1/8" spacers for
using original metal
standoffs or all Plastic.? It was for orginal BitX on a 1/16"
al. panel, uBit users may have to improvise.
Have at it, it takes
about 1 1/2 hr. to print and I get to throw out 1 out of 3
prints because of warping (pulling up at the ends).
73's Mike
On 3/11/2018 9:15 AM, Lawrence
Macionski via Groups.Io wrote:
WA6ISP has them for
sale in his catalog list -$4.00
Larry- W8LM
--
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID "MotDog@..."
Mike@...
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_Dave_ AD0B
Michael Shreeve
Vic WA4THR
Allard PE1NWL
ekelley