Date   
Re: Where to connect digital dial on BitX20A? #bitx20help

N1EDC
 

I'm using the Hendricks digital dial kit that is sold with their BitX20A kit.

I take it the only real way to attach it is to stick it to the solder pad of the relevant part on the underside of the board?  Is there any concern about having a longish lead to the dial?

I'll see if I can dig through the schematics and find out where the point the VFO enters the mixer is...  I know vaguely what each subassembly does, but I'll be honest when I say I have no idea how it all works. 

Re: Help! I think I may have just ruined my 9 year old's Chanukah

Gordon Gibby <ggibby@...>
 

Wow, THANKS, raj for those clues! Your suggestion to start at C3 and work backwards would allow him to further narrow down EXACTLY where the problem(s) are.

I still think that raduino is basically working. No other way to explain how he would have heard 26MHz and 4.8, 4.9 MHz signals.... Problems are in the main board or in the connections to the main board --- so he is getting closer and closer to solving this puzzle. Beginning to do functional testing of the BOARD is bearing much fruit, it seems.

Gordon

________________________________________
From: BITX20@groups.io <BITX20@groups.io> on behalf of Raj vu2zap <@Raj>
Sent: Friday, December 22, 2017 7:27 AM
To: BITX20@groups.io
Subject: Re: [BITX20] Help! I think I may have just ruined my 9 year old's Chanukah

I found many boards with C1,2,3 in B40 with bad solder and no continuity. This was in earlier batches.
Start at C3 and work back towards C1 for RX. Check for coil continuity and scrape and resolder the wire if required.

Raj

At 22-12-2017, you wrote:
Ok guys...I've gone through the video. I've removed the squeal from my receiver. The first coil there was shorting... (the one where you put the capacitor on the underside) so the entire board was getting nothing. Unfortunately, the last coil in the bandpass filter is not working....c1 doesn't produce any sound. THAT is going to require me to take the thing apart....take it out of the lunchbox. BUT, according to the video, once I do that, the receiver will be working. That's a job for tomorrow night though.

But, if I understand correctly, if I start hearing things, then we know the raduino is working fine.

PC-ALE on bitx (Automatic Link Establishment)

Gordon Gibby <ggibby@...>
 


I'm always evaluating new modes for emergency comms for our local ARES group, and one of the ones I want to better understand is ALE (automatic link establishment) --- which might benefit y'all's attempted bitx communications, by the way.


So today I hauled one of my Raduino's to work where I have a bit of time to fiddle.   It is one that is a standalone, configured to drive a boatanchor (EMP-proof) Heathkit SB-100, but other than that, it looks like any Bitx and is loaded with one of my sketches, branching off from Allards excellent 1.24 version.  


To which I had added FT-857d emulation, to allow computer controlled frequency selection of the Raduino.  


I'm quite pleased to report that the PC-ALE software when told to drive a "FT-847"  (closest available choice) appears to work FINE with the stuff I wrote, and so it would appear that we would be able to drive a BitX40 just fine (on one band) and would eventually be able to drive a uBitx on MULTIPLE bands, presuming that your antenna was capable of immediately working on each band.   (The latter can be done by any of several means: multiband trap or parallel dipole/ multiband vertical / auto-tuner that has memorized settings for multiple bands, etc etc etc.)


I am attaching a file of a screen grab of the PC-ALE software installed on my windows computer and "driving"  a raduino that it thinks is a Yaesu 847 radio.  At present I have only two scan frquencies installed, but the Raduino is happily flipping back and forth between them, sitting here on a desk before work starts.   


http://hflink.com/pcale/​       link to download the PC-ALE software.   You have to grab a frequency file appropriate for your part of the world and follow various directions to load it.


The PC-ALE stuff appears to need some sort of a soundcard interface, such as a Singnalink (or the $25TNC that our local ARES group has built a bunch of.....)   and I've used Signalinks etc many times successfully with my Bitx40''s --- just remember that the Signalink has a dead-dc-short transformer output, so put a 1 uf capacitor in the mic lead to dc-uncouple.    The Signalink output relay successfully drives the relays in the Bitx40 quite well.   My reed-relay outputs from homebrew interfaces were not always as successful.


Cheers!


Gordon


P.S.  And yes, this kinda stuff will go into the 3rd edition of the little book I wrote on emergency communications for hams...



Re: Help! I think I may have just ruined my 9 year old's Chanukah

 

I found many boards with C1,2,3 in B40 with bad solder and no continuity. This was in earlier batches.
Start at C3 and work back towards C1 for RX. Check for coil continuity and scrape and resolder the wire if required.

Raj

At 22-12-2017, you wrote:
Ok guys...I've gone through the video. I've removed the squeal from my receiver. The first coil there was shorting... (the one where you put the capacitor on the underside) so the entire board was getting nothing. Unfortunately, the last coil in the bandpass filter is not working....c1 doesn't produce any sound. THAT is going to require me to take the thing apart....take it out of the lunchbox. BUT, according to the video, once I do that, the receiver will be working. That's a job for tomorrow night though.

But, if I understand correctly, if I start hearing things, then we know the raduino is working fine.

Re: CW Configuration

Franz.Rebholz@...
 

Hi Allard,
thanks a lot for help !!

with10pF in each Input (A1, D3, to ground) Dah was only 1, Dit =7,
so I use for D3 20pF capacitor and now I have DIT =7 and DAH =4
and it works :-))

Raduino Diag v3

starting up…

TX-RX line installed: YES

PTTsense installed: YES

DIT touch sensor: 7 us

DAH touch sensor: 5 us

touch sensor detected: YES

Function button pressed: NO

SPOT button pressed: NO

analog reading tuning pot: 998

BFO 11998800, Si5351: 4873800, VFO 7125000, tuning pot 999, CLAR pot -154

BFO 11998800, Si5351: 4873800, VFO 7125000, tuning pot 999, CLAR pot -154

BFO 11998800, Si5351: 4873800, VFO 7125000, tuning pot 998, CLAR pot -154

display line 1: A 7.125.0 LSB

VFO: 7125000

BFO: 11998800

Si5351: 4873800

73 de Franz DF5GF

µBitx Coil Details #ubitx

Brian - KM4MLS
 

Hello All,
I'm very seriously considering scratch building a µBitx sometime after the holidays as my first homebrew transceiver and I have been reading over the documentation on the website,
After ordering and constructing the Bitx40, I have learned so so much (thank you so much, Farhan. Without the Bitx40, I'd still be clueless about some parts of radio circuitry), and I think I'm ready to attempt my first homebrew transceiver project.

There's just one issue... I've come to a part in the documentation that's not clear to me. I can guess, but I'd like a second opinion.  On the circuit description page for the µBitX, where it gives info on the inductors, There's two entries for L14, L15, and L16.  One says  10 turns on a T30-6 , the other says 14 turns; which is it?  I'm guessing L11, L12, and L13 are supposed to be 10 turns and L14, L15, and L16 are 14 turns.  Is this correct?  If so, I hope Farhan notices this and can correct it.

Thanks,
-Brian, KM4MLS

Re: Help! I think I may have just ruined my 9 year old's Chanukah

Dr Fred Hambrecht
 


Hanukkah is a Jewish holiday commemorating the rededication of the Holy Temple in Jerusalem at the time of the Maccabean Revolt against the Seleucid Empire. Hanukkah is observed for eight nights and days,

 

 

v/r

Fred W4JLE

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of marjannorm
Sent: Thursday, December 21, 2017 18:20
To: BITX20@groups.io
Subject: Re: [BITX20] Help! I think I may have just ruined my 9 year old's Chanukah

 

What is a Chanukah
Norm vk5gi

Re: Help! I think I may have just ruined my 9 year old's Chanukah

ron van doremalen (PA3FAT)
 

Sounds like music to my ears.

Good job!



Sent from my iPhone

On 22 Dec 2017, at 11:13, Gordon Gibby <ggibby@...> wrote:

Sounds like you are making wonderful progress!!!!

Congratulations and happy Hanukkah.  Pretty soon, maybe you and your daughter will both have radios!   I would encourage you to buy one or two little QRP dummy loads.

Is just One example of many that are available.   That will allow you to operate the transmitter and talk to someone nearby just using the dummy load.    

The manufacturer has already gone to the trouble of finding relatively noninductive resistors.    I still have my original Cantenna dummy load  from about 50 years ago.  But since I do a good bit of work with vacuum tube gear, I can often use incandescent lightbulbs, which aren't so much fun with solid state rigs, due to their inductance & constantly changing resistance.

Gordon 


Sent from my iPhone

On Dec 21, 2017, at 23:17, "tausciam@..." <tausciam@...> wrote:

Ok guys...I've gone through the video. I've removed the squeal from my receiver. The first coil there was shorting... (the one where you put the capacitor on the underside) so the entire board was getting nothing. Unfortunately, the last coil in the bandpass filter is not working....c1 doesn't produce any sound. THAT is going to require me to take the thing apart....take it out of the lunchbox. BUT, according to the video, once I do that, the receiver will be working. That's a job for tomorrow night though.

But, if I understand correctly, if I start hearing things, then we know the raduino is working fine.

Re: Help! I think I may have just ruined my 9 year old's Chanukah

Gordon Gibby <ggibby@...>
 

Sounds like you are making wonderful progress!!!!

Congratulations and happy Hanukkah.  Pretty soon, maybe you and your daughter will both have radios!   I would encourage you to buy one or two little QRP dummy loads.

Is just One example of many that are available.   That will allow you to operate the transmitter and talk to someone nearby just using the dummy load.    

The manufacturer has already gone to the trouble of finding relatively noninductive resistors.    I still have my original Cantenna dummy load  from about 50 years ago.  But since I do a good bit of work with vacuum tube gear, I can often use incandescent lightbulbs, which aren't so much fun with solid state rigs, due to their inductance & constantly changing resistance.

Gordon 


Sent from my iPhone

On Dec 21, 2017, at 23:17, "tausciam@..." <tausciam@...> wrote:

Ok guys...I've gone through the video. I've removed the squeal from my receiver. The first coil there was shorting... (the one where you put the capacitor on the underside) so the entire board was getting nothing. Unfortunately, the last coil in the bandpass filter is not working....c1 doesn't produce any sound. THAT is going to require me to take the thing apart....take it out of the lunchbox. BUT, according to the video, once I do that, the receiver will be working. That's a job for tomorrow night though.

But, if I understand correctly, if I start hearing things, then we know the raduino is working fine.

Re: uBITX on 1.8 MHz

Ashhar Farhan
 

Just buy your LPF from http://www.qrp-labs.com/lpfkit.html

- f

On Fri, Dec 22, 2017 at 12:02 PM, REJIMON G <rejimontkm@...> wrote:
received uBitx .. and started wiring works.. I found one additional 10k resistor in the box..nothing is mentioned about this  in the Manual ..Pls let me know where should I use it...Thanks...👍

Sent from my iPhone



Re: 3D printed uBitx case

Diver Martin <diver.martin@...>
 

Ah... apparently I attached a previous version of the file somehow... not sure how that happened.  Anyway, this is version 0.2.  Lines 98/99 can be commented in or out to print out half the case, which is how I'm going to try printing it tomorrow.

On Thu, Dec 21, 2017 at 10:30 PM, Martin Held <diver.martin@...> wrote:
Not sure if anyone has 3d printed a uBitx case yet or not... I really didn't like the idea of assembling into a pre-fabbed case, so I designed my own real fast in openScad before realizing my printer won't print something this big.  Either way, in case it's useful, I'm attaching a file and a preview.  I haven't tested this yet, but have been using my calipers and will try printing it out as front and rear panels only maybe.  I designed it originally with the idea that one would use a piece of plexiglass as the lid, screwed down onto 1.5" or so standoffs.

So here's version 0.1.  Enjoy.

--
Martin Held - AE7EU
http://ae7eu.com/
-------------------------------------------------------------------------------
If there aren't any questions, then what is there to learn?



--
Martin Held - AE7EU
http://ae7eu.com/
-------------------------------------------------------------------------------
If there aren't any questions, then what is there to learn?

ubitx ordered on 10th, shipped!

Rod Davis
 

Hi All,

I ordered my ubitx on 12/10 at 16:44 PST.

Got a notice from Paypal, unit shipped 12/20,

will be delivered 12/22 !!! Yay!

Rod KM6SN

Re: uBitx 12 MHz Crystal Filter transformer terminations

DuWayne Schmidlkofer
 

The same  transformer is used throughout the circuit.  In this case the leads marked with x are not connected to anything.  The filters are in effect terminated by a center tapped transformer. This gives a 2 to 1 winding  ratio, squaring these to get the impedance ratio you get a 4 to 1 ratio.  One end of the filter goes through this transformer center tap to a 50 ohm pi attenuator R114 -R116.  The other end of the filter is terminated by the impedance of the bidirectional amplifier it connects to.

DuWayne KV4QB




--
DuWayne  KV4QB

uBitx 12 MHz Crystal Filter transformer terminations

William Londree
 

I am puzzling over the 12 MHz Crystal Filter terminations. On the schematic transformers T5 and T6 have terminals 5 and 6 showing as each connected to an "x" and the filter description says that the filter is terminated to a robust 50 ohms to give a 200 ohm match to the filter on both ends. I have been "eye balling" the circuit board with magnification but can not determine where the winding sees a 50 ohm impedance termination. Wonder what I am missing? 

Bill

W6SDI

Re: uBITX on 1.8 MHz

REJIMON G <rejimontkm@...>
 

received uBitx .. and started wiring works.. I found one additional 10k resistor in the box..nothing is mentioned about this in the Manual ..Pls let me know where should I use it...Thanks...👍

Sent from my iPhone

3D printed uBitx case

Diver Martin <diver.martin@...>
 

Not sure if anyone has 3d printed a uBitx case yet or not... I really didn't like the idea of assembling into a pre-fabbed case, so I designed my own real fast in openScad before realizing my printer won't print something this big.  Either way, in case it's useful, I'm attaching a file and a preview.  I haven't tested this yet, but have been using my calipers and will try printing it out as front and rear panels only maybe.  I designed it originally with the idea that one would use a piece of plexiglass as the lid, screwed down onto 1.5" or so standoffs.

So here's version 0.1.  Enjoy.

--
Martin Held - AE7EU
http://ae7eu.com/
-------------------------------------------------------------------------------
If there aren't any questions, then what is there to learn?

uBITX on 1.8 MHz

Ashhar Farhan
 

Does uBITX do 1.8 MHz? Yes it does. It can lead you to legal trouble though.

The good news:
So, if you spin down to 1.8 Mhz you can receive just like any other band. If you press the PTT or key out morse code, the signal is going to go out.

The bad news:
the trouble is that, at 1.8 MHz, the low pass filter used has a cut-off at 5 MHz. So, it's second and third harmonics are going out as well. The local FCC gang is not going to like it, they may send you a notice.

The fix:
Make yourself an external LPF or buy one from Hans.

- f

Re: UbitX

Graham W
 

Because it is the " Christmas " period I think we will be waiting for a bit. Also from what I read they have SOLD OUT first run and the next run is in production.
I think these are going to be a spring time project for us all. I know we are all anxious to get the box. We will know when the yellow DHL delivery pulls up.

Re: Help! I think I may have just ruined my 9 year old's Chanukah

tausciam@...
 

Ok guys...I've gone through the video. I've removed the squeal from my receiver. The first coil there was shorting... (the one where you put the capacitor on the underside) so the entire board was getting nothing. Unfortunately, the last coil in the bandpass filter is not working....c1 doesn't produce any sound. THAT is going to require me to take the thing apart....take it out of the lunchbox. BUT, according to the video, once I do that, the receiver will be working. That's a job for tomorrow night though.

But, if I understand correctly, if I start hearing things, then we know the raduino is working fine.

Re: UbitX

Ben Vickery
 

I ordered one early today and was wondering if I would receive anything from the company.  I also have the PayPal receipt.  Mine should ship via DHL, I am anxious to get it.

Ben K4PHA