Date   
Re: trick to soldering in L5 and L7 or why did spurs on 80/40 get worse and 20/10 get better...

 

Mark I have both S+M and A T, both are working fine on my many test boards.
Every board is very individual in behaviour. I have some which put out lots of power
and some low power out. I have not figured out why as yet.

Some boards I changed only L5 and that was enough. Any RF pickup by L7 is removed by
the filter Y1 during TX.

Raj


At 24-06-19, you wrote:
Raj,

Thank you very much!

However, I am worried that the inductors I have are not the exact same ones you used. I got them from another HAM that ordered them thru the same supplier that you used, but EBAY suppliers have been know to substitute.

Mine are orange/yellow and are marked "A" and "T" and R68K 1145. However, in your post#60946 you said that they were Marked "S+M". I assume the 68k means 680nh? Perhaps the A+T vs S+M is a country/manufacturing plant?

Thoughts?



I suspect that the apparent power loss on 80/40 is not true. I measured harmonics/spurs 4x. For the Primary:

Band                    1st                     2nd                      3rd                         4th (after l5/l7 replaced)
80                       -65                       -64                      -57                        -65
40                       -67                       -67                      -65                        -70

80M looks like man outlier. And i really don't knew what i am doing with the SDRPLAY spectrum scope software, so mistakes could creep in.


40M does look lower after inductors. I am going to re-measure later today.

73
Mark
AJ6CU

Re: Ubitx occasionally hanging in transmit while receive led is on. Have to hit cw key a few times to get it unstuck. Ideas? #ubitx

MVS Sarma
 

Did you wire up the 4k7 resistor from Vcc ro cw wire?


On Tue, 25 Jun 2019, 8:54 am Sam Tedesco, <stedesco619@...> wrote:
Sticky relay. Lightly smack the relay (off by itself) with the handle of a screwdriver. 

Re: trick to soldering in L5 and L7 or why did spurs on 80/40 get worse and 20/10 get better...

Mark Hatch
 

I am all set. All bands legal (USA) for CW except for 10m where the secondary harmonic is only -30 down. 

73
Mark
AJ6CU

Re: Britx 40 Raduino Help

 

His is a picture of my original without the display. Hope that gives you the idea where to connect the 5pin.

Raj

Emacs!


At 24-06-19, you wrote:
i am attempting to assemble a Britx 40.

Instructions call for "connect a 5 pin connector to the bottom side of the Raduino"

There is none on the board.

Do I have the wrong board or is there a work around? (picture)

Any help appreciated

AA7MH

Re: Antuino

WoodJRx@...
 

I just thought i'd add that I just swapped my Antuino over to openGLCD, from the deprecated original GLCD.  I'm no programmer, just trying to be a tinkerer and teach myself.  I've figured out how to make a testing branch on github.  If anyone else would be willing to make sure my changes work (they do here, at least), I would greatly appreciate it!  As Bruce says - Use at your own risk!

My testing branch is https://github.com/woodjrx/antuino/tree/testing

I love the idea of the lookup table - but I need to get a step attenuator to test against, first!

~Josh
W0ODJ

Mag Loop for HOA's??

Jack Purdum
 

All:

We took Al's Double-Double mag loop:
Inline image
for a spin at FD. We ran 100W on 20M and 40M. First, we were surprised how well it performed for a "compromise" antenna. We worked 40M on Saturday and worked KS to ME, WI to FL. We even managed to work pileups, often towards the front of the pile. The stepper controller looks similar to this:

Inline image
although this photo was taken before the software was finished. Two encoders control the "target" frequency (e.g., 7199995) and the stepper motor, with the SWR calculated using an AD9850 as a signal source. The final version shows a 100-point plot of the SWR as you tune the cap to resonance on the target frequency. The cap position and frequency are very close to linear, so the final version will "fast step" to the target frequency and the encoder can then fine tune from there. We can tune to 1.1:1.0 on 40-30-20M. The display is a small 2.2" TFT display, but any SPI TFT using the ILI9341 driver could be used.

Quite honestly, Sunday wasn't as good. We concentrated on 20M and we were expecting better performance. (The models say it should perform better on 20M.) We didn't hear as many stations as on 40M on Saturday, but we're not sure if it was all antenna, band conditions, or a mixture of both. Al and I will be writing an article on its construction in a little bit after some testing that will give us some concrete numbers. We are devoting one chapter in the new Projects book to its construction and a second chapter to the stepper controller.

I will be trimming off the "spike" at the top for mine, which will allow it to fit in my car trunk. (I want to call it the "Luggable Double-Double", but Al doesn't like it.) Anyway, it will all be put into Open Source and we hope that some HOA-bound hams might find it useful since its 3' diameter might fit in an attic or somewhere else that the HOA considers acceptable.

BTW, I hope your club had as much fun at FD as we did...despite some rain.


Jack, W8TEE
Al, AC8GY

Re: Ubitx occasionally hanging in transmit while receive led is on. Have to hit cw key a few times to get it unstuck. Ideas? #ubitx

Sam Tedesco
 

Sticky relay. Lightly smack the relay (off by itself) with the handle of a screwdriver. 

Re: Ubitx occasionally hanging in transmit while receive led is on. Have to hit cw key a few times to get it unstuck. Ideas? #ubitx

d balfour
 

You have some common mode RF floating around. Start by choking the coax. Google w1his, He has some complete thoughts about common mode issues and shack noise.

Re: Britx 40 Raduino Help

Michael Hagen
 

Ubit Raduino was adapted from the BitX, but they are different.

Ubit has male pins plugging into Radio PCB.?? They do not swap over.

73s

Mike, WA6ISP


On 6/24/2019 1:53 PM, Vic WA4THR via Groups.Io wrote:
BitX40s and uBitXs use the same physical Raduino assembly, which has gone through several arrangements of components over time, but is electrically the same. It comes with different software loaded from the factory depending on which rig it is supplied for. The instructions for the BitX40 are admittedly confusing as it shows the original configuration with separate 5 and 8-pin connectors, but they still work. You need to connect the 5 wire connector to the pins closest to the blue contrast pot and just ignore the other pins for the BitX40. Just make sure the yellow lead is on the end pin.

=Vic=
-- 
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID  "MotDog@..."
Mike@...

Ubitx occasionally hanging in transmit while receive led is on. Have to hit cw key a few times to get it unstuck. Ideas? #ubitx

John Faivre
 


--
John Faivre WA9SGD

Re: Britx 40 Raduino Help

Vic WA4THR
 

BitX40s and uBitXs use the same physical Raduino assembly, which has gone through several arrangements of components over time, but is electrically the same. It comes with different software loaded from the factory depending on which rig it is supplied for. The instructions for the BitX40 are admittedly confusing as it shows the original configuration with separate 5 and 8-pin connectors, but they still work. You need to connect the 5 wire connector to the pins closest to the blue contrast pot and just ignore the other pins for the BitX40. Just make sure the yellow lead is on the end pin.

=Vic=

Re: Bitx40–Apollo Quindar Tones #bitx40

bobolink
 

Hi Allison,
This was just decoration for the Apollo 11 50th Commemoration but with all the power in one tone I was thinking it would announce that a QRP station was on frequency and extra effort might be made to dig the signal out.
But people might get angry as above—so no.
Demo with some audio feedback

Re: Britx 40 Raduino Help

Michael Hagen
 

That is a uBit Raduino??? Not BitX

On 6/24/2019 6:40 AM, mtngentleman@... wrote:
i am attempting to assemble a Britx 40.

Instructions call for "connect a 5 pin connector to the bottom side of the Raduino"

There is none on the board.

Do I have the wrong board or is there a work around? (picture)

Any help appreciated

AA7MH


-- 
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID  "MotDog@..."
Mike@...

Re: Bitx40–Apollo Quindar Tones #bitx40

ajparent1/KB1GMX
 

Yes, roger beeps are common on CB and VHF/UHF FM repeaters.

Its not a legality issue just not needed for SSB.

Allison

Re: Bitx-40 net? #bitx40

Robert D. Bowers
 

(Laugh!) I remember when PSK31 started.  I used to be active on it... a little.  Then life happened.  I also used to work JT65 a little, but again life happened (and the software I used 'expired').

I could cobble together cables, but I really would prefer to use this for what it was intended - SSB (I meant to use it mobile, but my van is too electrically noisy - and fixing it would be a major and un-affordable undertaking).  Joining nets would be an answer.  An afternoon/evening net would be best, as my limitations make mornings... difficult.  (There is one net I've wanted to join for some time, but the early morning doesn't work at all.)

I've tried some nets in the past (with my other radio), but got treated to religious and political rants, which I don't care for.  I will try again.


On 6/24/19 8:39 AM, Don - KM4UDX wrote:
Our local club (Vienna Wireless Society, in Vienna Va) has various nets almost every night in phone, digital, and CW). My humble v4 works well with all of them. But, getting a "SSB qso in the wild" is a rare bird. While listening to a contest, some island was calling CQ, and on a whim I answered, and I was floored when they came back to me.  It was the first non-net qso.  I was freaked and actually jumped for joy. (Getting out of the seat is good anyway, hahah).  

The CARS idea is a good one.  That also worked for me.  I also stumbled once upon a Michigan net of retired automotive assembly folks. They heard me just fine.  Participating in nets is a great way to go.  Google the nearest radio club, find their nets, and give it a go.

lastly, while you want to keep the rig simple, just try hooking it up to any old laptop with fldigi.  Just hook the laptop speaker out to the uBitx mic Jack, and uBitx audio out to into laptop mic.  The world will open up.  Totally.  Digital modes (stupid name, they should just say "typing" or "text" modes) are wicked effective for our little uBITX rigs. If you just try PSK31 on 7070, and assuming you like to text chat, you will have a blast.  

Let us us know how it goes. 

Don
km4udx

Re: Bitx40–Apollo Quindar Tones #bitx40

bobolink
 

OK thanks. Didn’t know they did that on CB.
And I don’t want to make anyone angry.
So back to the drawing board.

Re: Bitx40–Apollo Quindar Tones #bitx40

AA9GG
 

Not sure if a "roger beep" is legal, but I'm sure you'll piss someone off thinking your a CBer...


On Mon, Jun 24, 2019 at 10:51 AM bobolink <rwhinric@...> wrote:

I’ve been thinking of adding “Quindar” tones (1) to “decorate” my Bitx40 audio during the week of July 16, 2019. The result will be distinctive! and maybe help my QRP signal standout (with all power in a single tone rather than voice settings for high voice peak to average ratio). Got the idea from the AGC (Apollo Guidance Computer) restoration videos that annotate the AGC program with actual radio transmissions.

I wonder if this is legal?

This demo has feedback but demonstrates the idea.

YouTube Demo

(1)

https://en.m.wikipedia.org/wiki/Quindar_tones



--
Paul Mateer, AA9GG
Elan Engineering Corp.
www.elanengr.com

Re: trick to soldering in L5 and L7 or why did spurs on 80/40 get worse and 20/10 get better...

Mark Hatch
 

Raj,

Thank you very much!

However, I am worried that the inductors I have are not the exact same ones you used. I got them from another HAM that ordered them thru the same supplier that you used, but EBAY suppliers have been know to substitute.

Mine are orange/yellow and are marked "A" and "T" and R68K 1145. However, in your post#60946 you said that they were Marked "S+M". I assume the 68k means 680nh? Perhaps the A+T vs S+M is a country/manufacturing plant?

Thoughts?



I suspect that the apparent power loss on 80/40 is not true. I measured harmonics/spurs 4x. For the Primary:

Band                    1st                     2nd                      3rd                         4th (after l5/l7 replaced)
80                       -65                       -64                      -57                        -65
40                       -67                       -67                      -65                        -70

80M looks like man outlier. And i really don't knew what i am doing with the SDRPLAY spectrum scope software, so mistakes could creep in.


40M does look lower after inductors. I am going to re-measure later today.

73
Mark
AJ6CU


Britx 40 Raduino Help

mtngentleman@...
 

i am attempting to assemble a Britx 40.

Instructions call for "connect a 5 pin connector to the bottom side of the Raduino"

There is none on the board.

Do I have the wrong board or is there a work around? (picture)

Any help appreciated

AA7MH


Re: Bitx-40 net? #bitx40

Ted
 

Why, sure!! My computer logging contacts with other computers while I goof off or work.  The PC does seem bored and in need of a hobby. 

 




-Ted