¿ªÔÆÌåÓý

Date

Re: Blown (socketed) TDA2822?

 

Summary:? All is well, unless you have a WX branded TDA2822.


Here's an old post regarding the TDA2822, many other posts in that thread worth browsing:
? ??/g/BITX20/message/43342

Yes, the TDA2822D is still available from ST, would be a good choice
if you don't mind?the 50 mil pin spacing.? ?I'd stick with the NJM2073.

There was a lot of guessing in the forum when the WX clone chips first started blowing.
Many of the WX chips blew when somebody first plugged something into the headphone jack,
that seemed to put them over the edge. And some blew when first powered up.
But I don't think anything other than a WX chip ever blew.

Most of the TDA2822 datasheets spec a max operating voltage of 15v.
The UTC clone (never used by hfsignals) gives a max operating voltage of 12v, but does say it will survive 15v.
The WX clone does not have a datasheet, reports show it?can blow if they see more than 6 or 8 volts.
A power up event or plugging in headphones can be what puts them over the edge and causes them to smoke.
If you still have a WX chip, I suggest you either swap it out or add a voltage regulator to it as per?
? ??

That page suggests brands other than WX can blow when the output is shorted.
I don't recall any such reports in the forum, let me know if anybody can find such a report.

All of the datasheets specify distortion levels and power out as a function of supply voltage,
these tables typically top out at 9v or so.? ?So we don't know what the harmonic distortion is at 12v,
but that is well under the 15v maximum operating voltage.

All except the WX operate fine at 12v, my only concern would be that the chip might overheat when
driving a low impedance load (such as a short or a 4 ohm speaker) with?the volume turned up high.?
If the chip is not too hot to hold our finger on it, all is well.?
A momentary short would not give it enough time to overheat.?
?
Jerry, KE7ER


On Fri, Jun 22, 2018 at 12:59 am, Mvs Sarma wrote:
Thanks RAJ? sir.
The datasheets? whther suffix D or normal(dip) show test results all defined around 6 or 9V supply. and definitely not not at 12 or 13.8.
Thus most of us may have to reduce the supply to TDA2922 to say6V ( for 4 to 16 ohm speakers)

That would be a fiarpaly around V3 PCBs.

regards
sarma
vu3zmv

Regards
MVS Sarma


Re: experience with Sunil VU3SUA's enclosures #ubitx

 

If you don't get the case in time for his birthday the radio will work fine wired up without any enclosure.?

--


Re: Encoder problem

 

We buy bourns from mouser. If there are better ones, or a more robust model, let us know.
Bad quality encoders were the main reason for my original hack of using a pot for tuning. The software was so buggy that I would have killed the developer had I not had a bout of unusual mercy upon the kids.?
- f
- f


On Fri, 22 Jun 2018, 19:47 Arv Evans, <arvid.evans@...> wrote:
It is possible to build a simple test jig for evaluating mechanical switch type rotary encoders.
Use 1K resistors in series with LEDs to show contact closure for phase A, phase-B, and
for the push-switch.? By turning the shaft very slowly you can see the phase change and
by pushing the push-switch you can see its contact closure.? This might be worthwhile
if you suspect problems with an encoder or if you are building kits and will be providing
rotary encoders in the parts bag.?

Arv
_._
?

On Thu, Jun 21, 2018 at 8:00 PM Howard Fidel <sonic1@...> wrote:
So there are several possibilities. I had the same problem initially, when I realized that I didn't wire it correctly. I fixed the wiring and it worked. It could be a bad encoder, incorrect wiring or a bad Raduino, or corrupted software. If you have a two channel scope you can look at the two outputs signals, they should create 2 pulse trains shifted be 90 degrees when you turn the knob. The phase shift reverses when you change direction. Most likely if both have pulses they are phased correctly, but if one or both don't, it wont work. If you see the pulses, it is not the encoder.

Howard

On 6/21/2018 4:32 PM, n7nsd@... wrote:
And yes, rotating only causes the display to flicker the last two freq digit from zero to fifty. After pressing the encoder and getting the change band option, turning causes no change. Same with the next press and then back to 40m where it won¡¯t change freq.?



Re: Microscope - - new thread

 

Here's one of them, though I can't really recommend it.



Roy
WA0YMH

On Fri, Jun 22, 2018, 8:51 AM twowindsbear via Groups.Io <twowindsbear=[email protected]> wrote:
How about a link for the $60 Chinese microscope?

Thanks


Re: Rx Radio #ubitx-help - broadcast AM #ubitx-help

 

I would suggest you meet you local radio club or meet another ham - elmer that might help you. He/she will be amused by the Ubitx, am sure about that. Apply the 4eyes principle when you find something not obvious.

Il 22/giu/2018 15:48, "Bill Cromwell" <wrcromwell@...> ha scritto:
>
> Hi,
>
> Those broadcast stations are probably all AM (not SSB). We can bring in those stations by tuning their carrier to zero beat. That method has been around a century or so and is called "vesitigial AM". With the SSB filter in the ubitx you will only get one sideband from the AM station but that is all you need. Another reply has described the zero beating in more detail.
>
> The filter in the ubitx may be a little narrow for good AM detection. You might have to find a combination of BFO adjustment that helps 'improve' the audio. A couple of people on the list have described a mod to widen the passband a little. That mod would probably help you with your broadcast listening yet still be narrow enough for SSB operation. It would also be better for using ubitx on those digital signals that are all grouped together in a 3 to 5 KHz band. Your computer would then resolve a dozen or more digital (psk, ft8, etc) at one time without retuning your radio.
>
> I hope this helps.
>
> 73,
>
> Bill? KU8H
>
> On 06/22/2018 04:43 AM, sridhar wrote:
>>
>> I had ubitx ,currently using for RX Only ,its my first HF set ,Ubitx
>> having 3 Mhz to? 30 Mhz Frequency ,
>> 1)Can i use this for Normal Radio RX i.e SW , i am able here radio but
>> audio is not able to recognize.
>> 2)? what changes do need to do in this set to added any component to get
>> full audio from SW frequency
>>
>>
>>
>> de
>> vu3pen
>> sridhar
>> _._,_._,_
>
>
>
> --
> bark less - wag more
>
>
>


Re: experience with Sunil VU3SUA's enclosures #ubitx

 

I ordered mine and it took about six week to arrive. ?I received no prior notice from Sunil about the delivery, but did receive notice from DHL when it was shipped. ?The case is quite nice and well worth the wait. It really makes a nice looking radio.
73
Buddy KJ4ZSI


Re: Encoder problem

 

It is possible to build a simple test jig for evaluating mechanical switch type rotary encoders.
Use 1K resistors in series with LEDs to show contact closure for phase A, phase-B, and
for the push-switch.? By turning the shaft very slowly you can see the phase change and
by pushing the push-switch you can see its contact closure.? This might be worthwhile
if you suspect problems with an encoder or if you are building kits and will be providing
rotary encoders in the parts bag.?

Arv
_._
?


On Thu, Jun 21, 2018 at 8:00 PM Howard Fidel <sonic1@...> wrote:
So there are several possibilities. I had the same problem initially, when I realized that I didn't wire it correctly. I fixed the wiring and it worked. It could be a bad encoder, incorrect wiring or a bad Raduino, or corrupted software. If you have a two channel scope you can look at the two outputs signals, they should create 2 pulse trains shifted be 90 degrees when you turn the knob. The phase shift reverses when you change direction. Most likely if both have pulses they are phased correctly, but if one or both don't, it wont work. If you see the pulses, it is not the encoder.

Howard

On 6/21/2018 4:32 PM, n7nsd@... wrote:
And yes, rotating only causes the display to flicker the last two freq digit from zero to fifty. After pressing the encoder and getting the change band option, turning causes no change. Same with the next press and then back to 40m where it won¡¯t change freq.?



Re: Encoder problem

Dennis Yancey
 

I had the same issue. It turned out to be the nano was not reading the encoder when running ubit files, either factory or the CEC software. It would allow menu selection but not frequency change. The same was true on 3 Nanos.. but they all came from the same place. I replaced the nano with a new one from another source and the problem cleared right up.?

Also, look for John, VK2ETA, or Jim Sheldon. They are both doing some neat stuff regarding a Raduino diagnostic tools.


Re: Microscope - - new thread

 

How about a link for the $60 Chinese microscope?

Thanks


Re: Rx Radio #ubitx-help - broadcast AM #ubitx-help

 

Hi,

Those broadcast stations are probably all AM (not SSB). We can bring in those stations by tuning their carrier to zero beat. That method has been around a century or so and is called "vesitigial AM". With the SSB filter in the ubitx you will only get one sideband from the AM station but that is all you need. Another reply has described the zero beating in more detail.

The filter in the ubitx may be a little narrow for good AM detection. You might have to find a combination of BFO adjustment that helps 'improve' the audio. A couple of people on the list have described a mod to widen the passband a little. That mod would probably help you with your broadcast listening yet still be narrow enough for SSB operation. It would also be better for using ubitx on those digital signals that are all grouped together in a 3 to 5 KHz band. Your computer would then resolve a dozen or more digital (psk, ft8, etc) at one time without retuning your radio.

I hope this helps.

73,

Bill KU8H

On 06/22/2018 04:43 AM, sridhar wrote:
I had ubitx ,currently using for RX Only ,its my first HF set ,Ubitx
having 3 Mhz to 30 Mhz Frequency ,
1)Can i use this for Normal Radio RX i.e SW , i am able here radio but
audio is not able to recognize.
2) what changes do need to do in this set to added any component to get
full audio from SW frequency



de
vu3pen
sridhar
_._,_._,_
--
bark less - wag more


Re: BITX QSO Afternoon/Evening, Sunday, June 24, 3PM & 7PM Local Time, 7277 kHz in North America, 7177 kHz elsewhere.

John P
 

Have fun folks! I'm doing the Field Day thing, so I won't be on this week.
--
John - WA2FZW


BITX QSO Afternoon/Evening, Sunday, June 24, 3PM & 7PM Local Time, 7277 kHz in North America, 7177 kHz elsewhere.

John P
 

BITX QSO Afternoon/Evening, Sunday, June 24, 3PM & 7PM Local Time, 7277 kHz in North America, 7177 kHz elsewhere.

Join us as we make contacts with our BitX-40s or uBitXs or anything else on 7.277 MHz in 40 meters!

This is a worldwide event for BitX40 (and other QRP)?stations starting at 3PM and 7pm in each time zone. To participate, call CQ BitX on Sunday, starting at?3PM and/or 7PM?your local time. The BitX QSO Night continues through the evening and conditions usually improve after sunset, so it is worthwhile to participate later in the evening.

Suggested Best Operating Practices:

Work at QRP power levels unless conditions require more power.
Call and listen for CQ BITX on the hour and every quarter hour.
It is helpful if you call CQ BITX with your callsign, name and location.?
Repeat your callsign a number of times during your CQ BITX and during QSO's.
Start a QSO by confirming the callsign, location, name and signal report of the other operator.
Say the callsign, name and location of the other operator so others can hear.
If the frequency is busy, avoid long conversations.
After your initial QSO is complete, ask if there are any other stations who would like to contact.

Report your QSO's, discuss propagation, noise, signal reports, audio reports, antenna type, etc. in this thread.

This is an undirected, scheduled event.? The BITX QSO Night relies on you to call CQ BITX to initiate contacts with other stations, so warm up that final and transmit a few calls on Sunday evening.? Talk to you then!
--
John - WA2FZW


Somethings gone wrong!

 

Ok so I have just added a tap to the back of the chassis for my rtl sdr dongle as in this post??
After I soldered to R43 and C32 I tested the radio and noticed the receive had gone very attenuated! I unsoldered the cable and the receive became better but now when I transmit on 20m I am only getting 4w instead of the 8w I was getting. Also mic gain seems very low. I have to really shout to get anywhere near 2w now! I have just recently soldered a 47ohm resistor in parallel with r63 which made the audio so much better too...?

Any ideas what could have gone wrong? R43 and C32 both look fine...?

Thanks Carl.


Re: uBITX Version 4 first attempt #ubitx-help #ubitx

 

Hi Dave and all,

Both of the ubitx kits here came to downstate Michigan via DHL and came the rest of the way via USPS. The terminal downstate was in the metro Detroit area. The first one took a couple of months (or slightly more). the second was more like two weeks.

My ubitx is living happily in a steel box I made for it.

73,

Bill KU8H

On 06/22/2018 05:53 AM, David Wilcox via Groups.Io wrote:
Very interesting and humorous.

The DHL driver I talked to comes from a base 150 miles away and
sometimes for only one or two packages. He hates the companies that
require a signature and told me he is glad Farhan's company does not
require that. Very jolly guy and we had a good talk. I live in
Traverse City, Michigan and his base is near Grand Rapids.

Dave K8WPE

On Jun 21, 2018, at 10:21 AM, Gwen Patton <ardrhi@...
<mailto:ardrhi@...>> wrote:

I really can¡¯t see how they can be packed any better. I have not
heard of anyone who has received their bitx damaged until yours.
That it just real poor luck.

As Carl said, this kit was packed incredibly well. I was surprised to
see the plastic box inside the package, to be honest. I've ordered a
LOT of stuff from overseas, including all too much stuff that arrived
on a slow boat from China, and some of the most fragile stuff was
packed in a wad of bubble-wrap in a plastic bag, not even a cardboard
box! I got a charger for rechargeable lithium coin cells that took a
month to arrive on a boat, and it was just the thin cardboard RETAIL
box inside one of those black and white plastic overwrap bags Banggood
uses. Frankly, I'm surprised it arrived in a single piece, much less
functional.

The vast majority of shippers and delivery persons (including the U.
S. Snail Postal Disservice) are good, honest people who do their work
the best they can every day, even when it's difficult, even when the
weather sucks, even when there's a hundred things they'd RATHER be
doing with their day. As is inscribed on the James Farley Post Office
in New York, "Neither snow nor rain nor heat nor gloom of night stays
these couriers from the swift completion of their appointed rounds".
It's not an official motto, but it might as well be. Most of the
postal carriers I've met -- and being disabled, I have met nearly all
of the ones that come to my door, as I'm always home -- are
conscientious and take excellent care of my mail.

BUT...

Once in a while, I get one of THOSE postal carriers for whom that
motto is something to scoff at. They don't live by that. Their motto
seems to be "So long as I can sit on my bulbous butt in a little van
and walk as little as possible, I'll try to get your crap to you
eventually. But don't hold your breath if I have to get out of my damn
van because ain't nobody got time for that." Most of the mail carriers
who bring stuff to my house, if it's letters, will put them in the
mailbox at the curb, but if it's parcels, will get out of the van,
walk up to the porch, and put them either in front of my door or on
the porch where they won't get rained on.

But the OTHER sort will DRIVE their van into my backyard, turn around,
and either leave my packages on the BACK porch, where they don't have
to get out of the van, leaving them to get soaked by rain, or will
then pull up to the front porch and leave them on the TWO STEPS up,
again, where they're not under the overhang of the porch and will get
rained on. And heaven forfend I get a package that needs to be SIGNED
for, and I get THAT mail carrier. Suddenly, I'll find a slip in my
mailbox saying "Delivery attempted, no one home." Why? Because that
fat slob was too lazy to get out of the van and bring the thing to my
door and ring the bell. They'd rather just keep it in their van and
claim nobody was there to sign for it, so the guy who gets it TOMORROW
will have to get out of the van.

This guy is similar to the Amazon delivery person who'll mark it
"Delivered - placed directly into the recipient's hands", even when
you not only were home, but WAITING for the package on your PORCH.
These yahoos are who the latest Amazon features, attaching a photo of
the delivery location to your tracking info, and sending you a message
when they are 10 stops away from your home so you can track them on a
map, were implemented to catch. IF they honestly delivered it to the
wrong house, you have a chance of identifying where they really took
it, and you can WATCH to see if they actually came anywhere near your
house when they said "Oh, I delivered that!" and DIDN'T.

Somewhere out there is a box of expensive hydrocolloid band-aids that
someone got for free because the Amazon driver took it SOMEWHERE and
put it "in someone's hands". It wasn't my hands, that's all I know.

But once in a great while, you run into the EVIL delivery person.
They're the one that hates their job, hates the packages, hates the
weather, hates their boss, and most of all, hates YOU for making them
do that job delivering the packages in the weather because their boss
TOLD them to. THAT delivery person is likely, if your delivery makes
them do ANYTHING more than the bare minimum, to put the boot to your
parcels or THROW them on the porch from about 20 feet away...or, if
they're feeling particularly feisty, smack them onto your porch with a
baseball bat. And woe betide the person who calls them out for doing
this to their expensive packages, for that person shall receive NO
package unstomped, no parcel unkicked, and no gift box unpeed.

So, if you have received ALL of your parcels from a given location in
a destroyed condition, and NOBODY ELSE has this problem, the chances
of you receiving kits that Ashhar just HAPPENED to feel like running
through a hammer mill are slim and none, and Slim just left town. The
chances are much higher that you got THAT delivery person and somehow
ticked them off so they look for the parcels you want the most and
beat them with their delivery van's fire extinguisher before they
throw them overhand onto your porch, bouncing them off the wall before
driving across your lawn on the way out.

Talk to your postmaster or the appropriate delivery service
immediately if you receive damaged parcels. ESPECIALLY if parcels from
a particular location arrive damaged OFTEN. For all we know, the guy
who delivered your BitX kits has some beef with people from India and
specifically mangles those parcels. Or you may have ticked them off
somehow so they fold, spindle and mutilate anything sent to you just
because you're SUCH a prince.
--
bark less - wag more


Re: KD8CEC Firmware

 

Terence :?

After you get the KD8CEC firmware loaded I recommend that you also install his uBITX Memory Manager application on your PC.?

One very useful feature is the ability to read and decode the current data/settings from the Raduino and save them to a file on your?
computer. ?I recommend doing this right away before using it to modify any settings so that you have a baseline to return to should?
something get messed up later. This is especially important if you decide to try recalibration.

Cheers

Michael VE3WMB?

P.S. I got my Nextion 2.8" TFT Display so when a get some time this weekend I plan to move to KD8CEC V1.09b and give that I try.
I think that this display is going to be a "game changer" for this rig.?


Re: Audio feedback during transmit? #ubitx

 

I have done this on two units. I bring +5v/Gnd to the board from a
7805 regulator I added in each unit for powering several add-on's
by using a tightly twisted pair of wires. Actually the twisted pair is
scavanged from a length of cat 5e cable. I've had no problem with
either unit.

tim ab0wr

On Fri, 22 Jun 2018 13:00:49 +0000
"pat griffin" <patgriffin@...> wrote:

I have the same issue. Started with installation of agc board. I have
some relatively long cables owing to use of clamshell cabinet with
raduino on one side and board on another and thought that might be
cause. Redid shielding grounds etc still no cigar. Finally just took
12 v from tr through v reg so agc board is only on during receive 73
aa4pg On Jun 22, 2018, at 7:15 AM, Jim Reagan
<jimreagans@...<mailto:jimreagans@...>> wrote:

I also have the ND6T modification in my radio, but after redoing the
calibration and BFO setting, no longer have the issue. I suppose one
could add a small 5 volt relay and disable the AGC while
transmitting. Your mileage may vary, Jim W0CHL




Re: Audio feedback during transmit? #ubitx

 

¿ªÔÆÌåÓý

I have the same issue. Started with installation of agc board. I have some relatively long cables owing to use of clamshell cabinet with raduino on one side and board on another and thought that might be cause. Redid shielding grounds etc still no cigar. Finally just took 12 v from tr through v reg so agc board is only on during receive?
73 aa4pg


On Jun 22, 2018, at 7:15 AM, Jim Reagan <jimreagans@...> wrote:

I also have the ND6T modification in my radio, but after redoing the calibration and BFO setting, no longer have the issue.? I suppose one could add a small 5 volt relay and disable the AGC while transmitting.
Your mileage may vary,
Jim W0CHL


Re: Thoughts on a Ham Bus

 

From Paul VK3HN.:

"So the best I can imagine is a pseudo 'Hambus'. with control lines on the bus and signal interconnections not on the bus"

To me, this seems like the one idea that has some traction.?

Dennis KG4RUL??


Re: Understanding Spurious Emissions

 

No, your analogy would be right if you were on the wrong side of the road.?
If you get near even fully driving the modulator the last mixer is easily 10+ db
past saturated as result of there being enough IF gain to assure that.

For those that never go above 20Mhz its adequately filtered and not an issue.

Allison


Re: experience with Sunil VU3SUA's enclosures #ubitx

 

A week after I ordered my case with DHL shipping, I contacted Sunil to find out when I could expect the case. He told me that it had not shipped. At five weeks, I emailed him again and he said it had gone out that day. I received it 6 weeks after I ordered. I was not so concerned as I did not have the time to build up to that point. Sunil responded to my emails and I received my kit. The goodies that come with it are quite nice. I would suggest a bit more patience. I have no qualms about ordering from him again.
AF5RX Scott.


On Fri, Jun 22, 2018 at 12:53 AM, WA9PWR
<bill@...> wrote:
I ordered one 4/6/2018 and received it in I think very roughly a month.
73, Bill WA9PWR