Warren, we already know that you would like to rain on this parade at every possible chance. ? You will do a whole lot more good if you simply acknowledge that we already KNOW that and that you think this radio has severe disadvantages and not keep repeating
that. ? any people have invested what might be a considerable sum to them, and your efforts to disparage their radio do not do any good to mankind. ?
People have tried to tell you that in multiple polite ways, but you don¡¯t seem to grasp it. ?Your technical skills seem excellent, your kindness and social skills a bit lacking. ?
So therefore I¡¯m being rather candid with you.
Gordon
On Sep 7, 2018, at 08:37, Warren Allgyer < allgyer@...> wrote:
toggle quoted message
Show quoted text
Thanks Raj. I will pursue any tests you request but I have given up on this version of uBitx. I only ordered the filter to try because of the miraculous results reported. But I am really not interested in working further on a re-design. I have seen too much
and the return on the effort is simply not there.
I wish you and Farhan the best of luck.
WA8TOD
|
Thanks Raj. I will pursue any tests you request but I have given up on this version of uBitx. I only ordered the filter to try because of the miraculous results reported. But I am really not interested in working further on a re-design. I have seen too much and the return on the effort is simply not there.
I wish you and Farhan the best of luck.
WA8TOD
|
Thanks!
You should check at 7.4/14.2 21.2 and so on..
To observe the behavior of spurs.
1: Lock PTT
2. Press Fn button on tune knob
3. Select band select
Now you can tune TX while in TX in steps of 200K.. and see how the spurs behave. Fun!
Raj
toggle quoted message
Show quoted text
At 07-09-18, you wrote: Raj
As requested. I have included a peak table to help in identifying the spurs.
970.jpg conditions: Yellow trace: 1 KHz audio drive = 15 mVRMS, RV1 set to 2 watts out, R27 attenuator set to -1 dB. Purple trace is the same but with R27 attenuator at -11 dB.
971.jpg conditions: Yellow trace: 1 KHz audio drive = 100 mVRMS, RV1 set to 2 watts out, R27 attenuator set to -1 dB. Purple trace is the same but with R27 attenuator at -11 dB.
I included 971 because I noted your tests were made with 100 mV audio input and my tests have shown that level is much too high. As you can see, the spurs are far worse at that input level due to very high IMD. Unless, of course, your 100 mV was Pk-Pk and not RMS.
Clearly, in both cases, we have spurs that are products of the 45 MHz mixing and those can be indentified by differing levels at the different attenuator settings. The ones that most concern me at this point are those that do now change in level when the R27 attenuation is increased.
WA8TOD
|
Raj
As requested. I have included a peak table to help in identifying the spurs.
970.jpg conditions: Yellow trace: 1 KHz audio drive = 15 mVRMS, RV1 set to 2 watts out, R27 attenuator set to -1 dB. Purple trace is the same but with R27 attenuator at -11 dB.
971.jpg conditions: Yellow trace: 1 KHz audio drive = 100 mVRMS, RV1 set to 2 watts out, R27 attenuator set to -1 dB. Purple trace is the same but with R27 attenuator at -11 dB.
I included 971 because I noted your tests were made with 100 mV audio input and my tests have shown that level is much too high. As you can see, the spurs are far worse at that input level due to very high IMD. Unless, of course, your 100 mV was Pk-Pk and not RMS.
Clearly, in both cases, we have spurs that are products of the 45 MHz mixing and those can be indentified by differing levels at the different attenuator settings. The ones that most concern me at this point are those that do now change in level when the R27 attenuation is increased.
WA8TOD
|
Re: Keying needs debouncing
Am 06.09.2018 um 22:51 schrieb W2CTX: What version did you load.
rOn
On September 6, 2018 at 4:14 PM Matthias Zwoch <zwoch@...> wrote:
I got the W0EB/W2CTX sketch for my uBITX and found it a good solution .... /** * File name ubitx_V2_00R.ino * This source file is under General Public License version 3. * 73, Matthias DD7NT
|
Thanks OM Sharmaji on your valuable advice. Will follow those. Thanks and regards ARNAB SEN ( VU2CMV )
6/35 JM SENGUPTA ROAD.
B-ZONE.
DURGAPUR-713205.
MOB:9434833047
Arnab jee, ?Yourself? have rightly pointed to this link.
?In my opinion? there is no need to swap to LM386. The regulator mod could well be seen. ?Another issue troubling tda2822 was plugging a MONO headphone into audio jack while the set is ON. this causes shorting of output to ground on the ring connection of the audio jack. once you remove the TDA2822 for a possible socket, you could trace all the connections. The designer might have his? own issues to upload the artwork.
We only need to
1. Isolate the sleeve pin of thew audio jack not to short to ground on the metal body of enclosure. ?We can add a resistor in the sleeve path.that works as series resistor for the head phones .It really helps protecting one's' own ears.
?Once i had given that mod . it might be some where on the files section.
?2. lowering the supply to TDA chip by adopting a regulator.
regards ?sarma
vu3zmv
On Fri, Sep 7, 2018 at 9:12 AM ARNAB SEN VU2CMV < vu2cmv@...> wrote: Dear OM Sharmaji, ? ? ? ? ? Thanks for your reply and help. In uBitx.net website , using a 9v regulator to supply to 2822 has appeared. Thinking to do that. Also can divert the audio to a LM386 or PAM module.? Thanks and regards ARNAB SEN ( VU2CMV )
6/35 JM SENGUPTA ROAD.
B-ZONE.
DURGAPUR-713205.
MOB:9434833047
On Fri 7 Sep, 2018, 09:05 Mvs Sarma via Groups.Io, <mvs_sarma= [email protected]> wrote:
Arnab jee, ?i understand your issue. Last time some one manipulated the TDA2822 adopting 7806 regulator. ?Perhaps in files ot photos section you find the details of back plane as I saw the regulator was mounted on reverse. ?The power line leading to pin2 is entering up to middle of chip on bottom side and with a through hole, it is to top layer and reaching pin 2
i shall also search and link the photos for your need. ?regards sarma vu3zmv
On Wednesday, 5 September, 2018, 10:43:23 PM IST, ARNAB SEN VU2CMV < vu2cmv@...> wrote:
Dear OM Sharmaji, ? ? ? ? ? ? ? ? ? ? ? ? ?Thanks for your reply. Yes, Farhan has not published the PCB overlay. It's difficult to find the tracks in a SMD populated board. If you are using it, can you tell me how the audio IC 's pin 2( VCC) is connected to 12 V on the PCB? ARNAB SEN ( VU2CMV )
6/35 JM SENGUPTA ROAD.
B-ZONE.
DURGAPUR-713205.
MOB:9434833047 I suppose, such overlay has never been published by Ashar farhan vu2ese
On Wed, Sep 5, 2018 at 8:07 PM ARNAB SEN VU2CMV < vu2cmv@...> wrote: Can anybody please provide PCB overlay of uBitx v3? Thanks and 73s
VU2CMV
|
Warren,
Reduce your RBW to 10KHz and VBW to 1KHz and let me see a screen. With 300K many spurs will get combined.
Raj
toggle quoted message
Show quoted text
At 06-09-18, you wrote: While waiting for my filters to arrive from eBay I decided see what effect would result from replacing R27 with a variable attenuator. I attached two short lengths of miniature coax, one the each end of the R27 pad with appropriate grounds. I then rolled in 1 dB of attenuation to replace the effect of R27 and set the drive level to produce 2 watts with -30 dBV of 1 KHz tone on the audio input. The purple trace shows that 12 meter output on an uncalibrated scale with the consequent 45 MHz minus carrier spur at 20.1 MHz. The difference in level between the spur and carrier is about -42 dB (Marker 1D).
I then increased the R27 attenuator by 10 dB to -11 dB and captured the blue trace. The spur to carrier delta at this level is -46 dB. So, reducing the 45 MHz drive to the mixer by 10 dB decreased the spur by 14 dB.
So I am not sure if it is the filter characteristics that are reducing the spurs or simply the attenuation that is added by putting a high impedance filter in line in a low impedance feed (point made by Henning).
One thing is pretty sure, and supported by Raj, output power is going to fall off dramatically with this mod unless subsequent (clean) gain is added to the chain to offset the insertion loss of the filter. In one way that would be good because the transmit chain as it stands produces unacceptable levels of IMD at SSB power levels above 2 watts.
Filters should be here an Monday and will check more.......
|
Arnab jee, ?Yourself? have rightly pointed to this link.
?In my opinion? there is no need to swap to LM386. The regulator mod could well be seen. ?Another issue troubling tda2822 was plugging a MONO headphone into audio jack while the set is ON. this causes shorting of output to ground on the ring connection of the audio jack. once you remove the TDA2822 for a possible socket, you could trace all the connections. The designer might have his? own issues to upload the artwork.
We only need to
1. Isolate the sleeve pin of thew audio jack not to short to ground on the metal body of enclosure. ?We can add a resistor in the sleeve path.that works as series resistor for the head phones .It really helps protecting one's' own ears.
?Once i had given that mod . it might be some where on the files section.
?2. lowering the supply to TDA chip by adopting a regulator.
regards ?sarma
vu3zmv
On Fri, Sep 7, 2018 at 9:12 AM ARNAB SEN VU2CMV < vu2cmv@...> wrote: Dear OM Sharmaji, ? ? ? ? ? Thanks for your reply and help. In uBitx.net website , using a 9v regulator to supply to 2822 has appeared. Thinking to do that. Also can divert the audio to a LM386 or PAM module.? Thanks and regards ARNAB SEN ( VU2CMV )
6/35 JM SENGUPTA ROAD.
B-ZONE.
DURGAPUR-713205.
MOB:9434833047
On Fri 7 Sep, 2018, 09:05 Mvs Sarma via Groups.Io, <mvs_sarma= [email protected]> wrote:
Arnab jee, ?i understand your issue. Last time some one manipulated the TDA2822 adopting 7806 regulator. ?Perhaps in files ot photos section you find the details of back plane as I saw the regulator was mounted on reverse. ?The power line leading to pin2 is entering up to middle of chip on bottom side and with a through hole, it is to top layer and reaching pin 2
i shall also search and link the photos for your need. ?regards sarma vu3zmv
On Wednesday, 5 September, 2018, 10:43:23 PM IST, ARNAB SEN VU2CMV < vu2cmv@...> wrote:
Dear OM Sharmaji, ? ? ? ? ? ? ? ? ? ? ? ? ?Thanks for your reply. Yes, Farhan has not published the PCB overlay. It's difficult to find the tracks in a SMD populated board. If you are using it, can you tell me how the audio IC 's pin 2( VCC) is connected to 12 V on the PCB? ARNAB SEN ( VU2CMV )
6/35 JM SENGUPTA ROAD.
B-ZONE.
DURGAPUR-713205.
MOB:9434833047 I suppose, such overlay has never been published by Ashar farhan vu2ese
On Wed, Sep 5, 2018 at 8:07 PM ARNAB SEN VU2CMV < vu2cmv@...> wrote: Can anybody please provide PCB overlay of uBitx v3? Thanks and 73s
VU2CMV
|
Just for fun and to try some different output transformers on the PA chain, I built (dead bug) the Q90 and associated components test circuit ..Some will recognize it as part of Fig. 6.154 from EMRFD ..Photos show gain rolloff due to emitter bypass network ...
Jim
On Thu, Sep 6, 2018 at 11:48 AM ajparent1/KB1GMX < kb1gmx@...> wrote: Jim,
Good work.? Back in May I was writing about that problem nutty high bias.
I had the basic board with most of the 3904s in the TX running at 25 to 29ma!
However, you need to bridge those with .01, 2.7uH, 1k(or less) all in series
to tame the gain at 80m and balance power from 3-30mhz.? This is colletor
to base negative feedback to control the gain soar at low frequencies.
IF a stage is to high a gain that R can be as low as 330 ohms...
Allison
|
The problem was the original "relimate" two wire output cable
that I had twisted and then
connected to a BNC.. now the power is better!
Raj
At 06-09-18, you wrote:
toggle quoted message
Show quoted text
Both filter are identical as I
cannibalized one from another uBitv3 for now.
In my case the reduced power is slight on 80/40/15/10 but for some
reason 20 dropped. Something on 20 is behaving odd, when I touch the
dummy load the power comes down. Haven't figured out what it could be.
Probably a bad cable..
This evening? I tried some 1:9 trifilar transformer to increase 50
to 450 but that did not help. The first mixer is fortunately happy
with
650 ohms of 45M15 filter.
All my testing on my board is done with 1KHz modulation at 100mV. Power
can be increased a little by shouting into the mic!
I think as more Bitxers try out this, we will have more idea and
experiences to add to our own.
Raj
>Not sure if Raj replaced both filters, but if not, might T X power be
8mproved with a 'matched pair^ with identical pass and if the existing
filter was replaced?
>
>Brent
|
Dear OM Sharmaji, ? ? ? ? ? Thanks for your reply and help. In uBitx.net website , using a 9v regulator to supply to 2822 has appeared. Thinking to do that. Also can divert the audio to a LM386 or PAM module.? Thanks and regards ARNAB SEN ( VU2CMV )
6/35 JM SENGUPTA ROAD.
B-ZONE.
DURGAPUR-713205.
MOB:9434833047
On Fri 7 Sep, 2018, 09:05 Mvs Sarma via Groups.Io, <mvs_sarma= [email protected]> wrote:
Arnab jee, ?i understand your issue. Last time some one manipulated the TDA2822 adopting 7806 regulator. ?Perhaps in files ot photos section you find the details of back plane as I saw the regulator was mounted on reverse. ?The power line leading to pin2 is entering up to middle of chip on bottom side and with a through hole, it is to top layer and reaching pin 2
i shall also search and link the photos for your need. ?regards sarma vu3zmv
On Wednesday, 5 September, 2018, 10:43:23 PM IST, ARNAB SEN VU2CMV < vu2cmv@...> wrote:
Dear OM Sharmaji, ? ? ? ? ? ? ? ? ? ? ? ? ?Thanks for your reply. Yes, Farhan has not published the PCB overlay. It's difficult to find the tracks in a SMD populated board. If you are using it, can you tell me how the audio IC 's pin 2( VCC) is connected to 12 V on the PCB? ARNAB SEN ( VU2CMV )
6/35 JM SENGUPTA ROAD.
B-ZONE.
DURGAPUR-713205.
MOB:9434833047 I suppose, such overlay has never been published by Ashar farhan vu2ese
On Wed, Sep 5, 2018 at 8:07 PM ARNAB SEN VU2CMV < vu2cmv@...> wrote: Can anybody please provide PCB overlay of uBitx v3? Thanks and 73s
VU2CMV
|
Arnab jee, ?i understand your issue. Last time some one manipulated the TDA2822 adopting 7806 regulator. ?Perhaps in files ot photos section you find the details of back plane as I saw the regulator was mounted on reverse. ?The power line leading to pin2 is entering up to middle of chip on bottom side and with a through hole, it is to top layer and reaching pin 2
i shall also search and link the photos for your need. ?regards sarma vu3zmv
On Wednesday, 5 September, 2018, 10:43:23 PM IST, ARNAB SEN VU2CMV <vu2cmv@...> wrote:
Dear OM Sharmaji, ? ? ? ? ? ? ? ? ? ? ? ? ?Thanks for your reply. Yes, Farhan has not published the PCB overlay. It's difficult to find the tracks in a SMD populated board. If you are using it, can you tell me how the audio IC 's pin 2( VCC) is connected to 12 V on the PCB? ARNAB SEN ( VU2CMV )
6/35 JM SENGUPTA ROAD.
B-ZONE.
DURGAPUR-713205.
MOB:9434833047
I suppose, such overlay has never been published by Ashar farhan vu2ese
On Wed, Sep 5, 2018 at 8:07 PM ARNAB SEN VU2CMV < vu2cmv@...> wrote: Can anybody please provide PCB overlay of uBitx v3? Thanks and 73s
VU2CMV
|
Band scan & Spectrum not working with i2c standalone and CEC -Nextion display
I have been having fun with the ubitx v4 using CEC's firmware and nextion display. My problem is I cannot get the bandscan or spectrum screens to work with the i2c standalone dspmeter addon. I have followed Ian's instructions to a t and no spectrum. The dsp screen, cw decode and s meter work great. I have recompiled the firmware source in the memory saving mode and full blown mode. I have redownloaded the hmi and recompiled it multiple times to no success. What could I be doing wrong?
Marty? ?
-
N5KBP
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Re: Ubitx version 4 speaker impedance?
?I watch who? buy from, and see that one will? while the next will not.
?I have seen absurd shipping charges, an sellers like that i skip past. ?part of the problem is that my paypal is tied to my PO box address. We have NO home delivery, or mailbox along the road here. ?Once in a while something was sent to my street address, and I still got it, though the PO workers sometimes mumble? about it. ?Others knew what box it was anyway. ?I swear that some of the postal workers are lazy. ?I have also had Amazon claim that my street address did not exist. ?It sometimes takes a while to find a seller who will ship, but I usually do.
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Re: Right-sided relay harmonic attempted fix for v3/4 ubitx
On Thu, Sep 6, 2018 at 06:05 PM, <lynatmts@...> wrote:
"You see, wire telegraph is a kind of a very, very long cat. You pull his tail in New York and his head is meowing in Los Angeles. Do you understand this? And radio operates exactly the same way: you send signals here, they receive them there. The only difference is that there is no cat."
Except, even at a fast nerve impulse speed of around 100 m/s the cat would meow in LA about 11 hours later. The uBITX does much better than this. Tom, wb6b
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Re: Ubitx version 4 speaker impedance?
On Thu, Sep 6, 2018 at 04:48 PM, Bill Cromwell wrote:
Never mind about Hawaii and Alaska.
Some merchants only ship UPS or FedEx and will NOT ship USPS flat rate. Why? If they are a large merchant and have a national business contract with either UPS or FEDEX they get a large discount, up to 75%, on shipping. They still charge you full ticket and pocket the rest. I recently tried to purchase about $35 worth of transistors and ic's from an online store in Florida, they only ship USP and the shipping charge would be $76, all for a hand full of material that would fit in the smallest USPS flat rate box. I live with this all the time. 73 Paul KL7FLR
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Re: Right-sided relay harmonic attempted fix for v3/4 ubitx
Thanks for the helpful information!
toggle quoted message
Show quoted text
Another word on dremel / xacto / carpet knife
I have been in the pcb design and fab business for several decades.? The admonition to not use a dremel tool is good advice.? But...before you haul out your trusty Xacto knife...do yourself a huge favor and get the right blade.? The Xacto #16 or X16 is the
best blade to use.? The tip, while fine, is thick enough and has enough meat to not break off and fly into your eye or even worse places.? The sharp edge is 45 degrees to the support edge...not just 20 or so.? I have yet to see a track or plane modification
job that the #16 blade wasn't the best choice for.?? Be sensible folks...use a sharp...correct....blade made for the handle you are using.??? Put your carpet knife away...unless you're going to tune your carpet that is.? My carpet is so out of tune that it
wont even taxi...much less fly.
--
"You see, wire telegraph is a kind of a very, very long cat. You pull his tail in New York and his head is meowing in Los Angeles. Do you understand this? And radio operates exactly the same way: you send signals here, they receive them there. The
only difference is that there is no cat."
|
Re: Right-sided relay harmonic attempted fix for v3/4 ubitx
Another word on dremel / xacto / carpet knife
I have been in the pcb design and fab business for several decades.? The admonition to not use a dremel tool is good advice.? But...before you haul out your trusty Xacto knife...do yourself a huge favor and get the right blade.? The Xacto #16 or X16 is the best blade to use.? The tip, while fine, is thick enough and has enough meat to not break off and fly into your eye or even worse places.? The sharp edge is 45 degrees to the support edge...not just 20 or so.? I have yet to see a track or plane modification job that the #16 blade wasn't the best choice for.?? Be sensible folks...use a sharp...correct....blade made for the handle you are using.??? Put your carpet knife away...unless you're going to tune your carpet that is.? My carpet is so out of tune that it wont even taxi...much less fly.
--
"You see, wire telegraph is a kind of a very, very long cat. You pull his tail in New York and his head is meowing in Los Angeles. Do you understand this? And radio operates exactly the same way: you send signals here, they receive them there. The only difference is that there is no cat."
|
Re: Ubitx version 4 speaker impedance?
On Thu, Sep 6, 2018 at 04:56 PM, Wayne Leake wrote:
That seller is a rat, as he will not ship to PO box.And I only get mail at the post office here.
Check with your post office. In some places where the post office does not offer home delivery the post office will accept mail with your physical address but with your zip code with a dash and your box number, and put it in your box rather than return it. Looks just like a zip + four code. However, some companies' shipping software will remove the + four part of the zip if they think it is invalid.? Tom, wb6b
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Re: Ubitx version 4 speaker impedance?
Some merchants only ship via UPS or FedEx. Those don't do PO Boxes..except..out here they sometimes do. DHL always does. The fix is to give your address as the street number followed by a dash followed by the PO Box. Like this:
201 main street - PO Box 17
Rarely somebody has the same rant over my address. In the big city a postal employee lays your mail right in your hand. Out here we go to the post office to get it. The sellers in the big cities can sometimes not grasp that the rest of the world may be different.
Never mind about Hawaii and Alaska. United States possessions and territories are also served by USPS and the flat boxes are included. I have sent some goodies to hams in Guam in the flat rate boxes:) Sellers who have a 1938 view of the postal system are only hurting themselves. Their ignorance and arrogance might be their undoing.
73,
Bill KU8H
toggle quoted message
Show quoted text
On 09/06/2018 08:36 PM, Gordon Gibby wrote: Well, that seems pretty dumb. What difference does it make to them if
the shipping is the same?
On Sep 6, 2018, at 20:25, Wayne Leake <wayneleake@...
<mailto:wayneleake@...>> wrote:
It sometimes takes me longer to find a seller that will ship.
And I do a lot of cussing t the ones that don't.
Are a lot of places that some will not ship to for reasons unknown.
Wayne WA2YNE
Old and Tired, not old and stupid.
--
bark less - wag more
|
Raj vu2zap
ARNAB SEN VU2CMV