Date   
Re: KD8CEC Firmware S-Meter usage

Ralph Mowery
 


Yes, J1 and NOT j2.  

Anyway , the circuits works very well for AGC and the s-meter function.

Thanks for it and K5BCQ for putting the kit together at his cost.

Ralph ku4pt



On Mon, Jun 11, 2018 at 5:12 AM, Don, ND6T via Groups.Io <nd6t_6@...> wrote:
Mark,

Ian's circuit is not DC blocked at the output of the LM386 so it will not be zero volts when there is no signal. The simple diode circuit is found here. If you use my AGC circuit attach the lead to the cathode of D2 which is J1 ( NOT J2 , Ralph ) on K5BCQ's kit. Even if you don't want AGC, the kit will provide a nice S meter amplifier and detector by simply connecting +5 volts, ground, and audio input. Then attach your wire from J1 to the S meter input lead. 73, Don
_

Re: Net Neutrality Ending

Kevin Timm
 

What does this have to do with the BitX radios?

73 K5KDT
Kevin

On Sun, Jun 10, 2018 at 10:37 PM Richard Spohn <wb2gxm@...> wrote:
Just a friendly reminder that the not-so-Friendly Candy Company is
repealing "net neutrality" today.  Just another example in a long
string of events about making things worse, not better.  Keep an eye
on your net-provider bills!  -- Rich WB2GXM



Re: UBITX Touch Control TFT Display

Joe
 

I used a .22ufd but it is not critical so near anything close will work.


On Mon, Jun 11, 2018, 10:39 AM Bo Barry <wn4ghv@...> wrote:
I built one but doesn't look as nice yet. On the bench for testing.
Thanks tips. I only have one buck converter for the mega
Going to 'scope out all lines soon.
Is the cap.22uF or 0,44uF?  🤔
Bo W4GHV 

Re: KD8CEC Firmware S-Meter usage

Ian Lee
 

Mark

Maybe your S-Meter is good.
It is a circuit composed of about 4 parts and it will work if only the power is connected well.
Depending on the voltage measurement method, the value may not change.

Check the power supply to the LM386 and if it is correct, install it in uBITX.

Please refer to the link below.

Measure the ADC value in uBITX Manager. If there is a difference in measured value when the antenna is removed and the antenna is mounted, it is a success.

If the wires are connected properly, you only need to consider capacitor value
If the value changes slowly, you can connect a little less capacity

Ian KD8CEC

2018-06-11 13:46 GMT+09:00 Mark M <junquemaile@...>:

I got some LM386 chips and built the circuit shown in Ians's article. It's a pretty simple circuit but I can't get it to work. No matter the input level, the output is a constant 4.16v, even with the input shorted or open. I don't understand what's going on. I've tried several different LM386s but no change. I'm completely baffled. So what is this diode-capacitor sensor that I keep reading about? I have the ND6T AGC board but haven't assembled it yet. If I can't get something as simple and idiot-proof as the LM386 circuit to work I'm not sure I should tackle anything more complicated. :)



--
Best 73
KD8CEC / Ph.D ian lee
kd8cec@...
www.hamskey.com (my blog)

ubitx first power up

KM4TRT
 

I have my ubit x installed in a nice aluminum case and powered up.  It draws about 89 ma on receive, and receives stations.
but the stations are garbled as if the BFO is off.  Also Transmit only gives about 2 watts
At first the Radino  wasn't working at all but I downloaded Ashaar's original sketch and now all that appears to work properly, and I tried adjusting the BFO
This seemed to improve reception so I could at least understand the folks, but the audio is still horrible.
Is this just more playing with the BFO or is there a filter adjustment I should be looking at? I know there was some talk about the audio chip, but a filter out would also cause weak transmit?
Any comments?

Re: Auto Tuner?

Kees T
 

Very funny...... do you have additional details ?

73 Kees K5BCQ

Re: Net Neutrality Ending

Arv Evans
 

Way off-topic, unless there is a BITX somewhere in the Internet backbone
architecture. 
_._


On Sun, Jun 10, 2018 at 9:46 PM Bo Barry <wn4ghv@...> wrote:
Well I started with 300 baud internet, maybe I'll land up at 300 again if I don't cough upmore$$

On Sun, Jun 10, 2018 at 11:37 PM Richard Spohn <wb2gxm@...> wrote:
Just a friendly reminder that the not-so-Friendly Candy Company is
repealing "net neutrality" today.  Just another example in a long
string of events about making things worse, not better.  Keep an eye
on your net-provider bills!  -- Rich WB2GXM



Re: Net Neutrality Ending

Robert D. Bowers
 

Simple answer... since I first got my ticket in 1980, I've heard of several attempts by corporations to take over Amateur Radio bands for their own use... and read of others going back through the years.  In today's political climate, dollars have voices (and thus can influence votes) and all it would take would be a corporation (or rich corporate owner) to decide they want the frequencies, and suddenly we will have problems with message servers like this one.

Maybe one of the big-name transceiver manufacturers would decide they don't want people buying the BitX, they'd have the clout to make things difficult as well.

What the FCC does has a direct impact on people like amateur radio operators.  We're about communication, after all.  The people behind the move this topic is about are well aware that we can bypass their attempts to stifle free speech and dissemination of information.  If they can do it to the internet, well, we're only a tiny portion of the US population.  Most people won't even notice if we lost our allocations, or (as I've actually heard) think that corporations can better use those bands.

Also,

People overseas might be more interested in this than you think.  If things like this happen in the US, it's very possible they'd experience the same.  I do know that as a general rule, the people in other countries are very interested in what happens here... because of the politics what happens here could have a direct influence on what THEY experience.

On 06/11/2018 01:57 AM, Ken Hansen wrote:
This is an international Maillist in support of an Amateur Radio device, please do not post political comments here. Such topics are typically not of interest to subscribers outside the US.

Thanks,

Ken, N2VIP

On Jun 10, 2018, at 10:37 PM, Richard Spohn <wb2gxm@...> wrote:

Just a friendly reminder that the not-so-Friendly Candy Company is
repealing "net neutrality" today. Just another example in a long
string of events about making things worse, not better. Keep an eye
on your net-provider bills! -- Rich WB2GXM


Re: Auto Tuner?

Joe WB9SBD
 

Details about what?

Joe WB9SBD

The Original Rolling Ball Clock
Idle Tyme
Idle-Tyme.com
http://www.idle-tyme.com

On 6/11/2018 9:53 AM, Kees T wrote:
Very funny...... do you have additional details ?

73 Kees K5BCQ

Re: Transmitter Mods

Tom Christian
 

Thanks for the input, guys!  I was working with no magnification and "regular" soldering tools.  Sounds like the right equipment would open up a whole new world! .....:) Will follow up.
Tom
AB7WT

Re: Transmitter Mods

Rob Snow
 

Howard, just to verify for two purposes, 1) verify they will work, 2) If not, learn what I did wrong in picking them!

From DigiKey I am looking at: 

Inductor:
MLF2012C270KT000
445-1064-1-ND
FIXED IND 27UH 5MA 1 OHM SMD

Cap
08051A271FAT2A
478-10391-1-ND
CAP CER 270PF 100V NP0 0805

Learning everyday,
Rob AG5OV

Re: CB amplifiers RM-Italy KL203P

iz oos
 

On their website you can download the schematic. They are a bit obscure on the mosfets, it seems they are four MS1307. As said they lack of any lowpass filters so as such they do not comply to the FCC rules.


Il 11/giu/2018 15:48, "Richie Chambless" <rchambless7@...> ha scritto:
I’ve thought about these amplifiers, also. Despite the negativity around them, I think the only thing that’s missing is the low pass filters (the ones biased for linear operation). I’m thinking they all use RF transistors, but I could be wrong.

Re: CB amplifiers RM-Italy KL203P

iz oos
 

The MS1307 seem similar to the IRF520 btw


Il 11/giu/2018 18:39, "iz oos" <and2oosiz2@...> ha scritto:

On their website you can download the schematic. They are a bit obscure on the mosfets, it seems they are four MS1307. As said they lack of any lowpass filters so as such they do not comply to the FCC rules.


Il 11/giu/2018 15:48, "Richie Chambless" <rchambless7@...> ha scritto:
I’ve thought about these amplifiers, also. Despite the negativity around them, I think the only thing that’s missing is the low pass filters (the ones biased for linear operation). I’m thinking they all use RF transistors, but I could be wrong.

Re: CB amplifiers RM-Italy KL203P

Valentin Braescu
 

I use the CTE Booster 747 amplifier modified like this : www.radioamatoripeligni.it/i6ibe/pdf/cte747.pdf

It works well , up to 80w on 40meters . I only need some ebay hf lpf's .


On Mon, Jun 11, 2018 at 19:47, iz oos
<and2oosiz2@...> wrote:

The MS1307 seem similar to the IRF520 btw


Il 11/giu/2018 18:39, "iz oos" <and2oosiz2@...> ha scritto:

On their website you can download the schematic. They are a bit obscure on the mosfets, it seems they are four MS1307. As said they lack of any lowpass filters so as such they do not comply to the FCC rules.


Il 11/giu/2018 15:48, "Richie Chambless" <rchambless7@...> ha scritto:
I’ve thought about these amplifiers, also. Despite the negativity around them, I think the only thing that’s missing is the low pass filters (the ones biased for linear operation). I’m thinking they all use RF transistors, but I could be wrong.

Re: ubitx first power up

davedt1e@...
 

Try this,

https://groups.io/g/BITX20/message/47890

I found this method of Calibrating the BFO to be pretty straight forward and will put you pretty close.
Your audio will improve greatly and your reception will be up over the noise floor.
Good Luck

Dave
KD0UYH

Re: Transmitter Mods

Jerry Gaffke
 

Not many of us need to use 0201's.
Thank goodness.
It's like working with grains of salt from the salt shaker.

For hobby work down to 0603's (half the size of the uBitx's 1206 parts),
reading glasses and a bright light are usually good enough (for a nearsighted 63 year old).
I'm giving imperial sizes here, where 0603's are 06/1000 of an inch long, 02/1000 wide.
    https://en.wikipedia.org/wiki/Surface-mount_technology#Two-terminal_packages

A temperature controlled soldering pencil that gets hot enough,
a clean small conical tip, thin 40/60 leaded solder,  solder wick, and tweezers
are most of what you need to be successful with surface mount.

I usually use 0.4mm  (0.015") leaded solder around surface mount parts, 0.8mm for bigger stuff. 
The no-lead solder has a higher melting point and is harder to work with.

Working on a cookie baking tin can help coral wayward surface mount parts.
Somewhat.
If they hit the floor, I get my eyeball level with the floor and sweep the area with
a strong flashlight.  Helps to have a clean floor with no rug.

Be paranoid.  Make sure you have the correct part in hand before soldering it in place.
It can be very difficult to find the faults if something got built with the parts stirred up.

This paragraph stolen from post 37891:
When building a kit, I check all the C's and R's before soldering them in place.
    http://www.dx.com/p/aimometer-m320-digital-handheld-1-5-lcd-multimeter-w-auto-range-capacitance-test-black-red-385326
    http://wordpress.codewrite.co.uk/pic/2014/01/21/cap-meter-with-arduino-uno/
(I have not tried either one, but do have a cheap $10 DVM with capacitance range that is accurate to about 20pf)
When measuring small value caps, be sure to subtract the reading you get with  just the leads hanging out there.

If you want to measure inductors too, and want to know at what frequency a cap or inductor
starts behaving like an inductor or a cap, consider Kee's AQRP Vector Impedance Analyzer
near the bottom of this webpage:
    http://www.qsl.net/k5bcq/Kits/Kits.html

I saturate the solder wick with water soluble liquid flux when cleaning up solder
bridges and other messes, but some varieties of the liquid fluxes are very caustic and you
must be sure to clean them from the board when done. 
Flux can eat right through a copper trace in a few days.

Don't have a binocular microscope at home as they are spendy, but have considered getting one.
Very nice for identifying parts, and seeing bad solder joints.
A cold solder joint on an 0402 can look fine, under a microscope it's very clear what went wrong.

The uBitx is laid out with plenty of room between pads, seldom trouble with shorts.
But with closer pad spacing, there can by filaments of solder (be it leaded or no-lead) between pads
that are impossible to see without magnification.

Jerry


On Mon, Jun 11, 2018 at 08:59 am, Tom Christian wrote:
Thanks for the input, guys!  I was working with no magnification and "regular" soldering tools.  Sounds like the right equipment would open up a whole new world! .....:) Will follow up.

Re: ubitx first power up

davedt1e@...
 

Oh yeah, I forgot to mention that someone on the board has advised that you should cycle the radio off and on each time you calibrate the BFO so that the setting "takes".  Not sure if that's true or not but that's what I did just to be sure.

Re: BITX QSO Afternoon/Evening, Sunday, June 10, 3PM & 7PM Local Time, 7277 kHz in North America, 7177 kHz elsewhere.

Tom VE3THR
 

Was on the boat last night and only barely heard one station coming out of the noise.. need a bigger boat so i can plant some trees for my windom hihi. Anybody ever shunt fed an aluminum mast or verticle successfully? Stay safe with all those storms guys.
73 Tom VE3THR 

Re: BITX QSO Afternoon/Evening, Sunday, June 10, 3PM & 7PM Local Time, 7277 kHz in North America, 7177 kHz elsewhere.

William Cullison
 

Sounds like I need to get my 6 meter transverter built, put my tower up, and put up a beam.

73 Bill WA8VIH/4

On Sun, Jun 10, 2018, 23:03 John P <j.m.price@...> wrote:
Sorry I didn't make either session. I was having too much fun on the VHF contest now that I finally got the 6 meter beam up on the roof.  See y'all next week! 
--
John - WA2FZW

Re: External Amp

W0PWE
 

I bought one of these out of curiosity more than anything but if it worked I was going to use it as a 40M only amp while operating mobile with my scratch built Bitx40. To my surprise it worked pretty well. Output on 40 was about 50 watts with 1 watt drive and 70 watts with 5 watts drive. I built a 3dB attenuator for the input and a 40M LPF using T50-6 cores. I also built a signal operated PTT driver based on the WA2EBY design. My heat sink was salvaged from the motor control board that died in our Bosch washing machine. It is about 50mm x 100mm and the fins are about 50mm tall. After a long winded transmission the heatsink was just a little warm and the MOSFETs were likewise.

Then one day I was speaking a little too loud into the mic and the MOSFETs shorted. New MOSFETs should be in the mailbox when I get home today so I will try again. I think if I work on keeping the drive level down it will serve it's intended application just fine. I have certainly had more than $18 worth of fun with it so far. 73.
Jerry - W0PWE