Date   

Re: #ubitx #ubitx-help Not able to set up extension switches using CEC firmware #ubitx #ubitx-help

Tom, wb6b
 

As an experiment, what is the analog reading when no button is pressed, and when the function button of the encoder is pressed? It should change from a high value to a very low value. Looks like, for this to work, the software must be configured to cleverly take advantage the ability that the processor's internal pull-up resistors can be enabled on analog inputs as well as digital inputs. The pull-ups vary significantly, but are around 30K ohms. If this is not a bug in the CEC code, or unusually high internal pull-up values, the low values would suggest the external resistors are lower values than expected.  

Tom, wb6b


Re: ND6T AGC S Meter Calibration

Mark M
 

Guys...I understand that S meters are mostly subjective and it's certainly not a necessity but everything else works so well and the capability is there so why not try to get it to work? I'm not looking for mil-spec accuracy, I was just wondering if what I see is typical or if it indicates a problem somewhere in the AGC board. I don't think I've ever had a qrp rig with an S meter so it's kind of icing on the cake.

And like Jack, I've noticed that for some reason, during contests they all seem to indicate S9. ;)

Anyway, thanks for the inputs...

Mark AA7TA


Re: ND6T AGC S Meter Calibration

Jerry Gaffke
 

S-meter readings won't mean much until we all standardize our antennas.
Officially, an S-meter measures the signal power going into the radio.
But of course, all the cool radios have one so the uBitx wants one too.

An S-Meter using the diode detector of the AGC board will not have much range.
Given the two 1n4148 diode drops involved and 5v max into the Nano, I'd expect a range of under 3 S-Units.
At 6dB per S-unit, that's a voltage ratio of   10**(3*6/20) = 7.94.  
Use a log amp like the AD8307 if you really want an S-meter. 

Jerry, KE7ER


On Mon, Jul 23, 2018 at 06:10 PM, Jack Purdum wrote:
Are we rearranging the deck furniture on the Titanic here? How important is it to provide an S meter reading down to the last dB of the log scale? I recently worked a contest running 80W and I was a 5-9 EVERYWHERE on the planet! If someone asks, I'll give an S meter reading that comes off my rig's S meter, but I have no clue how accurate it is. Is a 59 from me the same as the 57 report from someone else? I don't know. If I listen to signals on my BITX and compare its S meter reading to my commercial rig and they are the same at 59, I think that's good enough for most of us. If you're doing antenna or some other performance-related research for an article or something, I can see the need for a more precise measurement. But for day-to-day QSO's, a quick calibration against my commercial rig is probably good enough.
 


Re: ND6T AGC S Meter Calibration

Jack, W8TEE
 

Are we rearranging the deck furniture on the Titanic here? How important is it to provide an S meter reading down to the last dB of the log scale? I recently worked a contest running 80W and I was a 5-9 EVERYWHERE on the planet! If someone asks, I'll give an S meter reading that comes off my rig's S meter, but I have no clue how accurate it is. Is a 59 from me the same as the 57 report from someone else? I don't know. If I listen to signals on my BITX and compare its S meter reading to my commercial rig and they are the same at 59, I think that's good enough for most of us. If you're doing antenna or some other performance-related research for an article or something, I can see the need for a more precise measurement. But for day-to-day QSO's, a quick calibration against my commercial rig is probably good enough.

Jack, W8TEE

On Monday, July 23, 2018, 9:01:03 PM EDT, Ion Petroianu, VA3NOI <ion.petroianu@...> wrote:


Mark,
If you do not require calibration to a standard I would suggest you set your lowest value (mine is set to 2) and your highest value (you measured S9 at 50 uV in that gives you 1.6 V) at one third of 254 (82 to 85) and select one of the samples. I liked sample 3 and my highest value is set to 80.
The software will calculate intermediate values for you.
Encode and write to uBitx.
73,
--
Ion

VA3NOI


Re: ND6T AGC S Meter Calibration

Ion Petroianu, VA3NOI
 

Mark,
If you do not require calibration to a standard I would suggest you set your lowest value (mine is set to 2) and your highest value (you measured S9 at 50 uV in that gives you 1.6 V) at one third of 254 (82 to 85) and select one of the samples. I liked sample 3 and my highest value is set to 80.
The software will calculate intermediate values for you.
Encode and write to uBitx.
73,
--
Ion

VA3NOI


Re: ND6T AGC S Meter Calibration

Ralph Mowery
 

The s-meter wire goes to the  pin at the hot end of C4  where the pins are.

Here is what I got, don't recall the frequency.  
.4 volts for 50 uV or -73 dbm
4 volts -40 dbm
3.9 volts -50 dbm
1.8 V -60
.55 V -70
.1 V -80

Using the following in the manager.
4,36,71,106,140,175,212,217

50 uV shows 3 bars on the meter
-63 dbm shows 6 bars
-57 dbm shows  +
-51  dbm shows ++

I was using an IFR 1200s and Fluke digital multimeter.  The s-meter pin was disconnected when doing the voltage measurments.

de ku4pt


On Mon, Jul 23, 2018 at 7:54 PM, Mark M <junquemaile@...> wrote:
I have Don's & Kees' AGC board in my uBitX and am trying to get the S meter function in Ian's firmware working. I've been using the S meter helper in the Manager to try to set some meaningful values but have not been terribly successful so far. It seems like only the strongest signals give a usable level, it shows either a very small value or about a 75 value with little variation in between, it's either S1 or S9+ with nothing in between.

I borrowed an Elecraft XG2 receiver test oscillator from a friend to try the calibration with known input levels (it puts out 1uV and 50uV signals on 80, 40, and 20M). Measuring the voltage on the AGC board at J1 I get the following (I hope this is readable):

Band   No Sig    1uV    50uV
 80      .4mV     1mV    1.6V
 40      .3mV     .5mV   1.7V
 20      .3mV     .7mV   1.6V

Are these values typical? I'm not 100% sure the board is working correctly anyway...it's my first attempt at surface mount assembly so I may have messed up something altho I don't see any obvious problems. The radio seems to work just fine otherwise and the receiver seems to have decent sensitivity, to my ear at least.

The S meter is certainly not essential but since it's there, I'd like to see if I can get it working.

Anyway, any advice/opinions/comments are appreciated.

Mark     AA7TA





Re: ND6T AGC S Meter Calibration

Nick VK4PP
 

Hi Mark.
I cant help, but I am in the same boat. I have built 3 (1 diy, 2 kit) of these boards in 2 different uBitx, and I don't think mine are working... On local nets I still get blasted by close by stations and struggle to hear distant ones, without twiddling the VOL...

I will watch this thread for replies.

Good luck, 73 Nick VK4PLN


ND6T AGC S Meter Calibration

Mark M
 

I have Don's & Kees' AGC board in my uBitX and am trying to get the S meter function in Ian's firmware working. I've been using the S meter helper in the Manager to try to set some meaningful values but have not been terribly successful so far. It seems like only the strongest signals give a usable level, it shows either a very small value or about a 75 value with little variation in between, it's either S1 or S9+ with nothing in between.

I borrowed an Elecraft XG2 receiver test oscillator from a friend to try the calibration with known input levels (it puts out 1uV and 50uV signals on 80, 40, and 20M). Measuring the voltage on the AGC board at J1 I get the following (I hope this is readable):

Band No Sig 1uV 50uV
80 .4mV 1mV 1.6V
40 .3mV .5mV 1.7V
20 .3mV .7mV 1.6V

Are these values typical? I'm not 100% sure the board is working correctly anyway...it's my first attempt at surface mount assembly so I may have messed up something altho I don't see any obvious problems. The radio seems to work just fine otherwise and the receiver seems to have decent sensitivity, to my ear at least.

The S meter is certainly not essential but since it's there, I'd like to see if I can get it working.

Anyway, any advice/opinions/comments are appreciated.

Mark AA7TA


Re: #ubitx #ubitx-help Not able to set up extension switches using CEC firmware #ubitx #ubitx-help

Daniel Conklin <danconklin2@...>
 

I have the same difficulty with the iambic paddle setup.  I am only getting readings of 4 and 6 in the ADC.  I used metal film resistors, could this cause this kind of problem?
Dan, W2DLC


Re: uBITX No Power Output all of a sudden #ubitx

Jerry Gaffke
 

Board fab shops give their design rules, perhaps something like:
   minimum 10 mil drill size
   minimum 5 mil annular ring of copper pad around each drill hole
   minimum 6 mil trace width, minimum 6 mil spacing 
That's the rules for OSH-Park, where a mil is 1/1000'th of an inch

The minimum bid shops might be a bit more sloppy than OSH-Park.
I've seen boards where the drill job wasn't centered on the pads, to where
the edge of the hole was well beyond the edge of the pad.
In that case, you won't get as good a connection between layers through that via,
though even so it's probably good enough for our purposes in most cases..
Or could be that the plating process was rushed, and they didn't get enough material in there.
Generally speaking, you're best off backing off 10 or 20% from what a fab shop claims
they can do on a good day.

The via that failed was being asked to take 2 or 3 amps into the IRF510 drains.
That's asking a lot for one via.
Might be better to make it a 40 mil hole, has greater circumference, greater current capacity.
Though as someone has already suggested, the wimpy via does serve as a sort-of poorly spec-d fuse.

Jerry, KE7ER





On Mon, Jul 23, 2018 at 02:00 PM, Clark Martin wrote:
Vias are frequently smaller than most component holes.  I suspect the small size tends to prevent the plating solution from getting in thoroughly due to surface tension. 
 


uBITX HF transceiver and blue MBITX metal case.

Ian Reeve
 

At a recent Radio Rally in the UK I happened acrosss a unbuilt uBITX kit and matching metal case.
The case is punched for a tx/rx bi-colour led and thanks to this group I have found the wiring needed for this.
The case also comes with small pcb for the led,for the tuning encoder,for the power and fuse assembly and for the three jack plugs, mic/ptt,key and phones.

It also came with a Digital board that fixes to the rear of the case. There is no information on this board or its wiring, it contains 2 jack sockets, a USB and a 9pin D Sub.

Any help would be appreciated on the latter item.
Thankyou and 73 de Ian M0IDR


Re: uBITX No Power Output all of a sudden #ubitx

Clark Martin
 

Vias are frequently smaller than most component holes.  I suspect the small size tends to prevent the plating solution from getting in thoroughly due to surface tension. 

Clark Martin
KK6ISP

On Jul 23, 2018, at 8:17 AM, ajparent1/KB1GMX <kb1gmx@...> wrote:

Vias are used to get from one side to another or as a top ground to bottom.
They are just plated through and often solder masked.

Like leaded component holes they are just plated through and can be defective or 
marginal.  When a soldered lead is there it tends to mask that but a via being 
unfilled by solder can fail.  

Its east to test for such a failure, ohm from point A to point B and if the resistance 
is not very small (miilliohms typically) it is suspicious. 

Generally the via is sized to have at least the current carrying ability as the trace 
leading to it or more.  When the work I've done on the my board I've had traces 
vaporize but the vias were intact.

I chalk this one up to one of those odd failures that can happen in large board runs.
Unless its a more than .5% event its likely anomaly.


Re: Mike element

Clark Martin
 


Clark Martin
KK6ISP

On Jul 23, 2018, at 8:02 AM, Jerry Gaffke via Groups.Io <jgaffke@...> wrote:

I bought a couple off ebay.
Element was fine, but plastic shell needed a hole drilled into it over the element.
No hole for sound to get in would definitely make it sound muffled.

This is an oft reported issue with Baofeng speaker mics. It is supposed to be that way to make it water-resistant.  But I think making it sound-resistant kind of defeats the purpose.


Re: PCB Artwork hint

Clark Martin
 

If impedance, crosstalk, or voltage are not an issue and the spacing meets the criteria specified, no, I don’t think it matters.  Aesthetics (typically) isn’t a design issue in PCBs, at least not for the traces.  All engineering is a trade off.  Routing a trace to be centered would mean (probably) a longer trace, which is a BAD THING albeit a very minor bad thing.

We all have our designing quirks and pet peeves, some are relevant and some are just “because that’s the way to do it”.  

Put it this way, how much extra effort would you put in to ensure that EVERY trace is centered between every other trace and to what tolerance?

I’ll keep an eye out for you at the next dinosaur fossil exhibit I go to.  ;)


Clark Martin
KK6ISP

On Jul 23, 2018, at 12:20 PM, Paul Galburt - K2AYZ <galburt@...> wrote:

I just finished checking a fairly complex PCB layout (not Ham related) for a product I am developing. I notice that many places where a trace runs between two pads, it is NOT centered, and therefore the spacing is not optimized. The designers tell me if it passes the design rule distance checks (DRC) in the software (Altium in this case), it's good and no further work is done.

I guess I am an old dinosaur who did a lot of layout in the old days and made sure using eyeballs that every trace (most of which were not "impedance designed") was centered between adjacent non-connected pads.

I am about to be extinct, or does anyone worry about this kind of stuff?


Re: PCB Artwork hint

Paul Galburt - K2AYZ
 

Funny thing,

I just finished checking a fairly complex PCB layout (not Ham related) for a product I am developing. I notice that many places where a trace runs between two pads, it is NOT centered, and therefore the spacing is not optimized. The designers tell me if it passes the design rule distance checks (DRC) in the software (Altium in this case), it's good and no further work is done.

I guess I am an old dinosaur who did a lot of layout in the old days and made sure using eyeballs that every trace (most of which were not "impedance designed") was centered between adjacent non-connected pads.

I am about to be extinct, or does anyone worry about this kind of stuff?

73,

Paul K2AYZ


Re: Inexpensive eBay Amplifier Kits

Mike aka KC2WVB <rb5363@...>
 

I ordered the $12 tuner kit from the same supplier as these 70 watt/100 watt amps being discussed. I considered the $18 amp but took a pass because too many other chores to do. I am glad I did take a pass. I say this because indeed as commented elsewhere this company gives you absolutely no schematic for the build. Glad I bought just a tuner because that is simple to construct minus plans. The amp would have been a PIA without a schematic. On the other hand it did arrive fairly soon, about 2-3 weeks and the parts are pretty decent.


On Wed, Jul 11, 2018, 6:42 PM <ulf.jagfors@...> wrote:
I ordered this PA and a low pass filter board three month ago. The items have not arrived. During several weeks I have now had email discussion throw ebay with this  trader to either send me a replacement or refund me. That has not worked out. The trader did NOT use any registred postal shipment which makes it impossible to trace the shipment. He did not even had my postal address when we discuss a replacement shipment. My advice. Do not buy anything from traders who do not use registred postal service. Do not use traders who has a US-warning on the PayPal service.
This PA will come without any schematics or essembly instruction something that is common for all DIY item from China. Don´t expect hem to send you any info after shipment. Luckely there are a number of instructions on the net which might help you to assembly this type of constructions. Many PA constructions from China seems to suffer from instability. Some of them use re-used outdated final transistors. They are cheap so you get what you pay for. Check on the net for people who has dealt with the DIY item you intend to buy before order. 
I have instead bought a ready assembled PA fully linear within .5 dB for 1.0-30 MHz- Input 100 mV and output 30-40 class AB SSB from Russia. Check RV3YF WEB site for more info and order instructions. Fast delivery with schematics. You need to add your own heatzink. He also have some interesting  s-meter and SWR display which I intend to add to the uBITX.
Ulf/sm0cgl


Re: Mike element

Arv Evans
 

Ken

I already have a small bag of electret microphone cartridges that were
purchased from several on-line vendors way back when we were working
on the BITX20A and BITX17A design.  My interest in the Baofeng
microphones is because they could be cheap housings for BITX40 and
uBITX microphones.  Sounds like that could still be the case as long as
one realized that the original cartridge will possibly need to be replaced.

Arv
_._


On Mon, Jul 23, 2018 at 8:18 AM Ken Held KF7DUR via Groups.Io <kf7dur=aol.com@groups.io> wrote:
Arv

The Baofeng spk/mics sound muffled on the Baofeng radio. They have plenty of gain for the Baofeng radio but are very weak on the uBitx. The -24dB element brought the level up nicely. Order a few to play with, you won't be disappointed.

Ken


Re: uBITX No Power Output all of a sudden #ubitx

ajparent1/KB1GMX <kb1gmx@...>
 

Vias are used to get from one side to another or as a top ground to bottom.
They are just plated through and often solder masked.

Like leaded component holes they are just plated through and can be defective or 
marginal.  When a soldered lead is there it tends to mask that but a via being 
unfilled by solder can fail.  

Its east to test for such a failure, ohm from point A to point B and if the resistance
is not very small (miilliohms typically) it is suspicious. 

Generally the via is sized to have at least the current carrying ability as the trace
leading to it or more.  When the work I've done on the my board I've had traces
vaporize but the vias were intact.

I chalk this one up to one of those odd failures that can happen in large board runs.
Unless its a more than .5% event its likely anomaly.

Allison


Re: Mike element

Jerry Gaffke
 

Stuff out there sold as a Baofeng mike can vary.
Perhaps Baofeng has several suppliers, I'd guess some are clones.

I bought a couple off ebay.
Element was fine, but plastic shell needed a hole drilled into it over the element.
No hole for sound to get in would definitely make it sound muffled.

Had no use for the speaker or transmit light, and didn't like the tug of the coiled cable.
So replaced the cable, put a 3.5mm stereo jack on the end, wired it up
to just have a mike element and PTT switch.  

Mike element and PPT switch seem fine.

Jerry, KE7ER


On Mon, Jul 23, 2018 at 07:17 AM, Ken Held KF7DUR wrote:
The Baofeng spk/mics sound muffled on the Baofeng radio. They have plenty of gain for the Baofeng radio but are very weak on the uBitx. The -24dB element brought the level up nicely. Order a few to play with, you won't be disappointed.


Re: NEXTION 4.3" Basic & Enhanced now Supported

Rob Bleumer <Bleumer@...>
 

Hi Björn,
from where you got your Nextion display?
Rob PA0RBL